WO2017063497A1 - Signal channel correction compensation method, apparatus and system - Google Patents
Signal channel correction compensation method, apparatus and system Download PDFInfo
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- WO2017063497A1 WO2017063497A1 PCT/CN2016/100069 CN2016100069W WO2017063497A1 WO 2017063497 A1 WO2017063497 A1 WO 2017063497A1 CN 2016100069 W CN2016100069 W CN 2016100069W WO 2017063497 A1 WO2017063497 A1 WO 2017063497A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03343—Arrangements at the transmitter end
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/08—Modifications for reducing interference; Modifications for reducing effects due to line faults ; Receiver end arrangements for detecting or overcoming line faults
Definitions
- Embodiments of the present invention relate to a wireless communication technology, and in particular, to a signal channel correction compensation method, apparatus, and system.
- FIG. 1 shows an antenna in the prior art. Schematic diagram of the system. It can be seen from FIG. 1 that the main structure of the antenna system includes an antenna 1, a RRU 2 (Radio Remote Unit), and a BBU 3 (Base Band Unit), wherein the RRU 2 includes multiple signal channels, where Each signal channel includes a transmission channel and a reception channel.
- RRU 2 Radio Remote Unit
- BBU 3 Base Band Unit
- each transmission channel needs to meet certain emission requirements, for example, the delay and phase of each transmission channel are aligned in the air interface, and, for example, the signal channels of each channel The ratio of the channel responses of the receive channel and the transmit channel are equal.
- a correction reference channel is set in the RRU2, and the compensation coefficient of each transmission channel is determined by correcting the reference channel with the signal compensation algorithm, and then the transmission channels are performed according to the compensation coefficients of the respective transmission channels. Supplementary correction.
- a data segment received from the receiving channel sometimes includes symbol samples in the next data segment, resulting in ISI (Inter-Symbol-Interference).
- Embodiments of the present invention provide a signal channel correction compensation method, apparatus, and system to effectively reduce inter-symbol interference of a received signal.
- an embodiment of the present invention provides a signal channel correction compensation method, including:
- the baseband unit BBU receives the received signals from the corrected reference channel in the radio remote unit RRU, and the received signals are sent by the BBU to the transmit channels of the RRUs. Each channel of the transmission corresponds to the output signal;
- the BBU performs correction compensation on the transmission channels of the respective channels according to the compensation coefficients of the transmission channels of the respective channels;
- the number of paths of the received signals is a positive integer greater than 1, and the number of paths of the received signals is equal to the number of channels of the transmitting channel.
- the BBU determines, according to the received signals of the respective paths, a channel delay of each of the transmitting channels, including:
- the BBU calculates a frequency domain channel response of each of the transmission channels according to the received signals received by the BBUs;
- the BBU determines a channel delay of each of the transmit channels according to a frequency domain channel response of each of the transmit channels.
- the BBU separately calculates frequency domain channel responses of the respective transmit channels according to the received received signals, including:
- the BBU according to the formula Calculating a frequency domain channel response of each of the transmission channels separately;
- s tx,i (k) represents a corrected reference signal transmitted by the BBU to the i-th transmit channel of the RRU; r rxc,i (k) represents the received i-th transmit channel of the corrected reference channel The corresponding received signal; k represents the frequency domain subcarrier number, k ranges from 0 to N-1, and N is the total number of frequency domain subcarriers; i ranges from 0 to the total number of transmit channels in the RRU The number is reduced by one; i, k are integers greater than or equal to 0, and N is a positive integer.
- the BBU uses a transmission channel corresponding to the minimum channel delay as a transmission reference channel, and determines a compensation coefficient of each channel, including:
- the BBU calculates an initial correction compensation coefficient of each of the transmission channels according to a frequency domain channel response of each of the transmission channels;
- the BBU determines a compensation coefficient of each of the transmission channels by using an initial correction compensation coefficient of a transmission channel corresponding to the minimum channel delay as a reference.
- the BBU calculates an initial correction compensation coefficient of each of the transmission channels according to the frequency domain channel response of each of the transmission channels, including:
- the BBU takes the frequency domain channel response of each of the transmission channels into a reciprocal to obtain an initial correction compensation coefficient of each of the transmission channels.
- the BBU determines, by using an initial correction compensation coefficient of the transmission channel corresponding to the minimum channel delay as a reference, determining a compensation coefficient of each of the transmission channels, including:
- the BBU divides an initial correction compensation coefficient of each of the transmission channels by an initial correction compensation coefficient of the transmission channel corresponding to the minimum channel delay to obtain a compensation coefficient of each of the transmission channels.
- the BBU is connected to multiple RRUs
- the baseband unit BBU receives the received signals from the corrected reference channel in the radio remote unit RRU, including:
- the BBU receives each received signal from a corrected reference channel in each of the RRUs, and the received signals are sent by the BBU to the transmit channels of the plurality of RRUs, and then Each of the plurality of RRUs corresponds to an output signal.
- an embodiment of the present invention provides a signal channel correction compensation apparatus, where the apparatus is deployed in a baseband unit BBU, and includes:
- a receiving unit configured to receive, according to a correction reference channel in the radio remote unit RRU, each received signal, where the received signal is sent by the BBU to each of the RRUs to send a transmission correction reference signal, and Each of the transmission channels respectively corresponds to an output signal; the number of channels of each received signal is a positive integer greater than 1, and the number of channels of the received signal is equal to the number of channels of the transmission channel;
- a channel delay determining unit configured to determine, according to each received signal, each of the roads Channel delay of the shot channel
- a compensation coefficient determining unit configured to use a transmitting channel corresponding to the minimum channel delay as a transmitting reference reference channel, and determine a compensation coefficient of each of the transmitting channels
- a correction compensation unit configured to perform correction compensation on the respective transmission channels according to the compensation coefficients of the respective transmission channels.
- the channel delay determining unit is configured to separately calculate a frequency domain channel response of each of the transmitting channels according to the received received signals, and according to the frequency domain channel response of each of the transmitting channels And determining a channel delay of each of the transmitting channels.
- the channel delay determining unit is specifically configured according to a formula Calculating a frequency domain channel response of each of the transmission channels separately;
- s tx,i (k) represents a corrected reference signal transmitted by the BBU to the i-th transmit channel of the RRU; r rxc,i (k) represents the received i-th transmit channel of the corrected reference channel The corresponding received signal; k represents the frequency domain subcarrier number, k ranges from 0 to N-1, and N is the total number of frequency domain subcarriers; i ranges from 0 to the total number of transmit channels in the RRU The number is reduced by one; i, k are integers greater than or equal to 0, and N is a positive integer.
- the compensation coefficient determining unit is specifically configured to separately calculate an initial correction compensation coefficient of each of the transmitting channels according to a frequency domain channel response of each of the transmitting channels;
- the BBU determines a compensation coefficient of each of the transmission channels by using an initial correction compensation coefficient of a transmission channel corresponding to the minimum channel delay as a reference.
- the compensation coefficient determining unit is configured to recalculate the frequency domain channel response of each of the transmitting channels to obtain an initial correction compensation coefficient of each of the transmitting channels.
- the compensation coefficient determining unit is specifically configured to divide an initial correction compensation coefficient of each of the transmission channels by an initial correction compensation coefficient of a transmission channel corresponding to the minimum channel delay, to obtain the respective paths.
- the compensation factor of the transmit channel is specifically configured to divide an initial correction compensation coefficient of each of the transmission channels by an initial correction compensation coefficient of a transmission channel corresponding to the minimum channel delay, to obtain the respective paths.
- the compensation factor of the transmit channel is specifically configured to divide an initial correction compensation coefficient of each of the transmission channels by an initial correction compensation coefficient of a transmission channel corresponding to the minimum channel delay, to obtain the respective paths.
- the compensation factor of the transmit channel is specifically configured to divide an initial correction compensation coefficient of each of the transmission channels by an initial correction compensation coefficient of a transmission channel corresponding to the minimum channel delay
- the BBU is connected to multiple RRUs
- the receiving unit is configured to receive, according to a correction reference channel in each of the RRUs, a received signal, where each received signal sends a transmission correction to each of the plurality of RRUs by the BBU. After the reference signal, the output signals corresponding to the respective transmission channels of the plurality of RRUs are respectively corresponding.
- an embodiment of the present invention provides an antenna system, including an antenna and a radio frequency pull.
- the RRU includes a correction reference channel and a plurality of transmission channels, wherein the correction reference channel is respectively connected to the antenna and the BBU; and the multiple transmission channel is connected in parallel between the antenna and the BBU;
- the BBU is configured to perform correction compensation on the respective transmit channels in the RRU, including:
- the BBU performs correction compensation on the transmission channels of the respective channels according to the compensation coefficients of the transmission channels of the respective channels;
- the number of paths of the received signals is a positive integer greater than 1, and the number of paths of the received signals is equal to the number of channels of the transmitting channel.
- the BBU is configured to separately calculate a frequency domain channel response of each channel according to the received signals, and determine, according to the frequency domain channel response of each channel The channel delay of each channel.
- the BBU is specifically used according to a formula Calculating a frequency domain channel response of each of the transmission channels separately;
- s tx,i (k) represents a corrected reference signal transmitted by the BBU to the i-th transmit channel of the RRU; r rxc,i (k) represents the received i-th transmit channel of the corrected reference channel The corresponding received signal; k represents the frequency domain subcarrier number, k ranges from 0 to N-1, and N is the total number of frequency domain subcarriers; i ranges from 0 to the total number of transmit channels in the RRU The number is reduced by one; i, k are integers greater than or equal to 0, and N is a positive integer.
- the BBU is specifically configured to calculate an initial correction compensation coefficient of each of the transmission channels according to a frequency domain channel response of each of the transmission channels, and specifically configured to use a minimum channel delay.
- the initial correction compensation coefficient of the transmitting channel is the reference datum, and the determination is made.
- the compensation coefficient of each channel is described.
- the BBU is specifically configured to rectify a frequency domain channel response of each of the transmit channels to obtain an initial correction compensation coefficient of each of the transmit channels.
- the BBU is specifically configured to divide an initial correction compensation coefficient of each of the transmission channels by an initial correction compensation coefficient of the transmission channel corresponding to the minimum channel delay, to obtain the transmission channels of the respective transmission channels. Compensation factor.
- the BBU is connected to multiple RRUs
- the BBU is specifically configured to receive, according to a correction reference channel in each of the RRUs, a received signal, where each received signal sends a transmission correction reference to each of the plurality of RRUs by the BBU. After the signal, corresponding to each of the plurality of RRUs, the output signals respectively correspond to the output signals.
- an embodiment of the present invention provides a signal channel correction and compensation device, where the device is deployed in an antenna system, including:
- a communication interface a memory, a processor, and a communication bus, wherein the communication interface, the memory, and the processor communicate via the communication bus;
- the memory is for storing a program
- the processor is configured to execute the program stored by the memory; when the Openflow network runs across a topology learning device of a traditional network protocol IP network, the processor runs a program, and the program includes :
- each of the received signals receives, by the correction reference channel in the radio remote unit RRU, each of the received signals, after the apparatus sends a transmission correction reference signal to each of the RRUs, and transmitting with each of the channels
- the channels respectively correspond to the output signals
- the number of paths of the received signals is a positive integer greater than 1, and the number of paths of the received signals is equal to the number of channels of the transmitting channel.
- the signal channel correction compensation method, device, system and device when acquiring the compensation coefficient of the signal channel, use the transmission channel corresponding to the minimum channel delay as the transmission
- the reference reference channel can effectively avoid the occurrence of the next fragment symbol sample condition in the current received segment, and avoid the resulting ISI.
- FIG. 1 is a schematic structural view of an antenna system in the prior art
- FIG. 1 shows another structural schematic of the antenna system
- FIG. 3 shows another structural diagram of the antenna system
- Figure 4 shows a further schematic structural view of the antenna system
- FIG. 5 is a schematic diagram showing the effect of signal channel correction compensation
- FIG. 6 is a flow chart showing a signal channel correction compensation method according to an embodiment of the present invention.
- FIG. 7 is another flow chart showing a signal channel correction compensation method according to an embodiment of the present invention.
- FIG. 8 is a schematic structural diagram showing a plurality of RRUs in a single cell
- FIG. 9 is still another flowchart of a signal channel correction compensation method according to an embodiment of the present invention.
- FIG. 10 is a schematic structural diagram of a signal channel correction compensation apparatus according to an embodiment of the present invention.
- FIG. 11 is a schematic structural diagram of a signal channel correction compensation apparatus according to an embodiment of the present invention.
- an antenna system used in the MIMO transmission mode of the LTE system is taken as an example, and a signal channel correction method according to an embodiment of the present invention is described in detail.
- FIG. 2 shows another structure of the antenna system. intention.
- the main structure of the antenna system includes antenna 1, RRU2 and BBU3, wherein multiple signal channels are included in RRU2, and each signal channel includes a receiving channel and a transmitting channel, and the antenna system shown in FIG.
- the RRU2 includes four signal channels, such as a transmission channel and a reception channel in the 0th signal channel, wherein the transmission channel includes a transmission circuit TX0, and the transmission circuit TX0 passes a CPRI (Common Public Radio Interface).
- CPRI Common Public Radio Interface
- the receiving circuit includes a receiving circuit RX0, and the receiving circuit RX0 is connected to the transceiver interface TRX0 of the BBU3 through the CPRI, and is connected to the antenna 1 through the parallel module.
- the parallel circuit module is an electronic device for separating the receiving channel and the transmitting channel, and may specifically be a duplexer, a switch circuit or a circulator.
- connection structure of the other road signal channels included in the RRU 2 is the same as the connection structure of the 0th signal channel, and will not be described again.
- the LTE system uses the antenna system shown in Figure 2 for MIMO transmission in two ways, namely BF (Beamforming) and CL-MIMO (Closed-Loop MIMO) transmission, BF transmission.
- the mode and the CL-MIMO transmission mode perform weighted transmission on the base station side, so that the signals of the plurality of transmit antennas 1 form a coherent superposition at the time of reception, thereby obtaining an array gain and improving the SINR (Signal to Interference plus Noise Ratio) of the user. ).
- SINR Signal to Interference plus Noise Ratio
- the transmission channel in the antenna system needs to meet certain transmission conditions.
- h tx,0 (k) to h tx,3 (k) respectively represent the frequency domain channel response of the transmission channel 0 to the transmission channel 3, and k represents the frequency domain subcarrier number, ranging from 0 to Nfft- 1, where Nfft is the total number of frequency domain subcarriers.
- the response of the transmission channel is consistent by delay or frequency domain compensation, which is expressed by the formula:
- ⁇ tx, 0 to ⁇ tx, 3 respectively represent correction compensation coefficients of the transmission channel 0 to the transmission channel 3.
- h rx,0 (k) to h rx,3 (k) respectively represent the frequency domain channel response of the receiving channel 0 to the receiving channel 3
- k represents the frequency domain subcarrier number, ranging from 0 to Nfft-1, Where Nfft is the total number of frequency domain subcarriers.
- the response of the transmission channel is consistent by delay or frequency domain compensation, that is, according to the formula
- ⁇ tx, 0 to ⁇ tx, 3 respectively indicate correction compensation coefficients of the transmission channel 0 to the transmission channel 3
- ⁇ rx, 0 to ⁇ rx, 3 respectively indicate correction compensation coefficients of the reception channel 0 to the reception channel 3.
- the inconsistency of the response of the RF analog device does not guarantee the alignment of the channel itself without frequency domain or time domain channel compensation, so the channel needs to be passed. Compensation algorithm and hardware design to obtain correction compensation coefficient.
- the method of obtaining the correction compensation coefficient in the embodiment of the present invention includes designing an additional correction reference channel 4.
- FIG. 3 shows another structural diagram of the antenna system.
- the coupling circuit 5 and the correction reference channel 4 are added to the structure of the antenna system.
- the coupling circuit 5 is disposed on the antenna. Internally, it belongs to an external correction method.
- the transmitting channel includes a TX (transmitter) circuit and a feeder 6 in the RRU2
- the receiving channel includes an RX (Receiver) circuit and a feeder 6 in the RRU2.
- the 0th channel includes a transmitting circuit TX0 and a feeder 6.
- the 0th receiving channel includes a receiving circuit RX0 and a feeder 6.
- the coupling circuit 5 is disposed inside the antenna to complete the correction of the TX circuit and the feeder.
- FIG. 4 is a schematic structural diagram of another antenna system.
- the added coupling circuit 5 in the antenna system is disposed inside the RRU, and belongs to an internal calibration method.
- the transmitting channel includes a TX circuit in the RRU2
- the receiving channel includes an RX circuit in the RRU2, such as the 0th transmitting channel including the transmitting circuit.
- TX0, the 0th channel receiving channel includes the receiving circuit RX0.
- the coupling circuit is disposed inside the RRU, and the signal is led from the RRU outlet (internal) to the coupling circuit 5 to complete the correction of the TX circuit, and the external feeder can only be guaranteed by the construction constraints.
- the coupling circuit 5 may be a circuit composed of a power dividing/combiner, wherein the coupling circuit 5 in FIG. 4 is connected to the output ends of the respective transmitting channels through a directional coupler.
- the correction reference channel 4 includes a transmitting circuit TXc and a receiving circuit RXc, wherein the BBU3 transmits and receives a correction reference signal to the transmitting circuit TXc, and after receiving the coupling circuit 5 and the antenna 1, the BBU3 receives each of the RRUs 2
- the feedback signal is received in the channel, and the compensation coefficients of the respective receiving channels are obtained according to the feedback signal.
- the receiving circuit RXc in the correction reference channel 4 is for receiving the signal output from the coupling circuit 5, and outputting the reception signal to the BBU 3, so that the BBU 3 corrects each transmission channel in the RRU according to the received signal, and the following will correct the transmission channel. Detailed description will not be repeated here.
- the method for implementing the signal channel correction provided by the embodiment of the present invention is the same, and the following will be shown in FIG.
- the antenna system is taken as an example to describe the signal channel correction compensation method in the embodiment of the present invention.
- the BBU3 control calibration is started, and a transmission correction reference signal is sent to each transmission channel.
- the BBU3 transmits a transmission correction reference signal to the transmission circuit TX0 through the transceiver interface TRX0.
- the transmission correction reference signal is sent to the transmission circuit TX1 through the transceiver interface TRX1, the transmission correction reference signal is transmitted to the transmission circuit TX2 through the transceiver interface TRX2, and the transmission correction reference signal is transmitted to the transmission circuit TX3 through the transceiver interface TRX3.
- the BBU3 may transmit a transmission correction reference signal to the transmission channel by means of frequency division, time division or space division.
- the transmission correction reference signal sent by the BBU3 to the four-way transmission channel is aggregated by the coupling circuit 5 and transmitted to the correction reference channel 4, and the BBU3 receives the reception information corresponding to each transmission channel from the correction reference channel, assuming that each reception channel
- the signals are r rxc,0 (k), r rxc,1 (k), r rxc,2 (k), r rxc,3 (k), which can be obtained by LS (Least Square) channel estimation.
- the frequency domain channel response of the channel transmission channel, where the formula for the LS channel estimation is:
- r rxc,i (k) is the i-th receive signal received through the corrected reference channel 4
- s tx,i (k) is the i-th path correction of the BBU3 transmission.
- the reference signal wherein in the antenna system shown in FIG. 3, the value of i is 0 to 3.
- h rxc (k) is the channel response of the corrected reference receive channel
- h tx,i (k) is the channel response of the i-th transmit channel.
- the rectification number can be used to obtain the initial correction compensation coefficient, that is, according to the formula Obtain the initial correction compensation coefficient of the i-th channel, which is utilized Before obtaining the initial correction compensation coefficient, you can Noise reduction processing is performed to improve the accuracy of the acquired initial correction compensation coefficient.
- a correction channel is used as a reference reference to correct the correction coefficients of each channel, and generally adopts channel 0 as the reference.
- Relative correction with reference to the reference ie:
- Figure 5 shows the effect of signal channel correction compensation. It can be seen from the figure that when channel 0 is used as the reference reference, the correction compensation methods that channel 0 can use include: reciprocal compensation, minimum delay compensation, and maximum delay. Compensation; wherein when the maximum delay channel is used as a reference reference for relative correction, the next OFDM symbol sample is received in the current OFDM (Orthogonal Frequency Division Multiplexing) data at the receiving end, resulting in ISI.
- OFDM Orthogonal Frequency Division Multiplexing
- an embodiment of the present invention provides a signal channel correction compensation method, which is configured to use a minimum channel delay when acquiring a compensation coefficient of a signal channel.
- the channel can effectively avoid the occurrence of the next fragment symbol sample in the current receiving segment, and avoid the resulting ISI.
- FIG. 6 is a flowchart of a signal channel correction compensation method according to an embodiment of the present invention.
- the execution body of the method is a BBU, and the main processing steps include:
- Step S11 The BBU receives each received signal from the corrected reference channel in the RRU.
- each received signal is a signal corresponding to each of the transmission channels after the BBU sends a transmission correction reference signal to each of the RRUs.
- the number of channels of each received signal is a positive integer greater than 1, and the number of channels of the received signal is equal to the number of channels of the transmitting channel.
- the specific process for the BBU to receive the received signals from the corrected reference channel in the RRU includes:
- the BBU sends a transmission correction reference signal to each of the transmission channels in the RRU.
- the BBU 3 transmits a transmission correction reference signal to the transmission circuit TX0, the transmission circuit TX1, ..., the transmission circuit TX3, respectively.
- the BBU receives the received signals one-to-one corresponding to each of the transmission channels from the correction reference channel in the RRU.
- the BBU 3 receives each received signal from the receiving circuit RXc of the corrected reference channel.
- Step S12 The BBU determines the channel delay of each transmission channel according to each received signal.
- Step S13 The BBU uses the transmission channel corresponding to the minimum channel delay as the transmission reference reference channel, and determines the compensation coefficient of each channel.
- Step S14 The BBU performs correction compensation for each transmission channel according to the compensation coefficient of each transmission channel.
- the transmission channel corresponding to the minimum channel delay is used as the transmission reference channel, the occurrence of the next fragment symbol sample in the current received segment can be effectively avoided. This brings the ISI.
- FIG. 7 is another flowchart of a signal channel correction compensation method according to an embodiment of the present invention.
- the execution body of the method is a BBU, and the main processing steps include:
- Step S21 The BBU sends a transmission correction reference signal to each transmission channel in the RRU.
- Step S22 The BBU receives the corrected reference channel from the RRU and the respective transmit channels respectively. One-to-one corresponding received signals.
- Step S23 The BBU separately calculates a frequency domain channel response of each channel according to the received received signal.
- the BBU calculates the frequency domain channel response of each channel according to the received signals, including:
- s tx,i (k) represents a corrected reference signal transmitted by the BBU to the i-th transmit channel in the RRU;
- r rxc,i (k) represents the receive corresponding to the i-th transmit channel received by the corrected reference channel Signal;
- k represents the frequency domain subcarrier number, k ranges from 0 to N-1, and N is the total number of frequency domain subcarriers;
- i ranges from 0 to the total number of transmit channels in the RRU minus one;
- i, k is an integer greater than or equal to 0, and N is a positive integer.
- Step S24 The BBU determines the channel delay of each channel according to the frequency domain channel response of each channel.
- the channel delay of each channel in the time domain is determined according to the frequency domain channel response value.
- Step S25 The BBU calculates the initial correction compensation coefficients of the respective transmission channels according to the frequency domain channel responses of the respective transmission channels.
- the BBU takes the frequency domain channel response of each channel to be reciprocal, and obtains an initial correction compensation coefficient of each channel.
- Step S26 The BBU determines the compensation coefficient of each channel by using the initial correction compensation coefficient of the transmission channel corresponding to the minimum channel delay as a reference.
- the BBU divides the initial correction compensation coefficient of each transmission channel by the initial correction compensation coefficient of the transmission channel corresponding to the minimum channel delay, and obtains the compensation coefficient of each transmission channel.
- Step S27 The BBU performs the transmission channel of each channel according to the compensation coefficient of each channel. Correct the compensation.
- the foregoing method of the first embodiment and the second embodiment of the present invention can be applied to an antenna system of a single cell and a single RRU, and can also be applied to an antenna system of a single cell and multiple RRUs. For example, as shown in FIG. 8, it is included in an antenna system.
- each received signal is a signal that is output by the BBU to each of the plurality of RRUs after transmitting the transmission correction reference signal to each of the plurality of RRUs.
- the BBU After receiving the received signals of the RRUs, the BBU calculates the correction compensation coefficients of the transmission channels according to the method of the first embodiment or the second embodiment.
- the calculation method of the correction compensation coefficients is the same as that in the first embodiment or the second embodiment, and is not described again. .
- FIG. 9 is still another flowchart of a signal channel correction compensation method according to an embodiment of the present invention.
- the execution body of the method is a BBU, and the main processing steps include:
- Step S31 The RRU is started. At this time, the channel response of the transmitting and receiving channels may fluctuate due to changes in temperature, humidity, and the like of the RRU internal channel.
- Step S32 The BBU determines whether the RRU startup time exceeds X minutes.
- the BBU initiates channel correction after waiting for the channel response to stabilize. That is, the BBU determines whether the RRU startup time exceeds x minutes. If it exceeds, it means that the channel response has stabilized, and channel correction can be performed.
- Step S33 The BBU triggers the RRU transmission channel correction.
- the BBU sends a transmission correction reference signal to multiple transmission channels.
- the transmission correction reference signal may be sent in various manners such as time division, frequency division, or code division.
- the transmission correction reference signal passes through the RRU, and is looped back from the coupling circuit through the antenna. Correcting the reference receive channel (sometimes the coupling circuit loops back directly from the RRU, without passing through the antenna, the processing flow is no different, no longer separately stated), and the BBU performs LS channel estimation on the received signal obtained from the corrected reference receive channel, optionally
- the LS channel estimation is performed after performing operations such as noise reduction filtering, and the initial transmission correction coefficients of the respective transmission channels are obtained by using the result of the LS channel estimation, wherein the initial transmission correction coefficient takes the reciprocal of the channel estimation.
- Step S34 The BBU obtains the channel delay of each transmission channel according to the obtained LS channel estimation value, and takes the channel with the smallest channel delay as the transmission reference reference channel, and uses the initial transmission correction coefficient of the reference reference channel as a normalization factor.
- the initial correction correction coefficient is subjected to relative correction processing, that is, all the initial transmission correction coefficients are divided by the initial transmission correction coefficient of the reference reference channel to obtain a second correction compensation coefficient.
- Step S35 The BBU triggers the RRU receiving channel correction.
- the BBU sends a reception correction reference signal to the transmission channel in the correction reference channel, and receives the correction reference signal through the RRU and the antenna, and returns from the coupling circuit loop to the plurality of receiving channels in the RRU (sometimes the coupling circuit directly loops back from the RRU,
- the BBU does not separately distinguish the processing flow from the processing flow. It is estimated that the BBU then determines the initial reception correction coefficient of each reception channel by using the LS channel estimation result of each reception channel in the RRU, wherein the initial reception correction coefficient takes the reciprocal of the channel estimation. (The FDD system does not have this step)
- Step S36 The BBU takes channel 0 (optional) as the reference reference channel according to the obtained LS channel estimation value, and uses the initial reception correction coefficient of the received reference reference channel as a normalization factor to perform relative correction on the initial transmission correction coefficient. Processing, that is, all initial reception correction coefficients are divided by the initial reception correction coefficient of the reference reference channel to obtain a second reception correction coefficient; (the FDD system may not have this step)
- the channel with the smallest channel delay is selected as the reference reference channel for relative correction to avoid the ISI caused by the correction compensation.
- FIG. 10 is a schematic structural diagram of a signal channel correction compensation apparatus according to an embodiment of the present invention.
- the apparatus is deployed in a baseband unit BBU, and includes: a receiving unit 41, a channel delay determining unit 42, a compensation coefficient determining unit 43, and a correction compensating unit 44. ;
- the receiving unit 41 is configured to receive each received signal from the corrected reference channel in the radio remote unit RRU, and each received signal is sent by the BBU to each of the RRUs, and then transmitted with each channel.
- the channels respectively correspond to the output signals; the number of channels of each received signal is a positive integer greater than 1, and the number of channels of the received signal is equal to the number of channels of the transmitting channel;
- the channel delay determining unit 42 is configured to determine a channel delay of each channel according to each received signal
- the compensation coefficient determining unit 43 is configured to determine, by using a transmission channel corresponding to the minimum channel delay as a transmission reference channel, a compensation coefficient of each channel;
- the correction compensation unit 44 is configured to perform correction compensation on each transmission channel according to the compensation coefficient of each transmission channel.
- the channel delay determining unit 42 is specifically configured to calculate the frequency domain channel response of each channel according to the received signals, and determine the channel according to the frequency domain channel response of each channel. Channel delay of the channel.
- the channel delay determining unit 42 is specifically used according to the formula. Calculating the frequency domain channel response of each transmission channel separately;
- s tx,i (k) represents a corrected reference signal transmitted by the BBU to the i-th transmit channel in the RRU;
- r rxc,i (k) represents the receive corresponding to the i-th transmit channel received by the corrected reference channel Signal;
- k represents the frequency domain subcarrier number, k ranges from 0 to N-1, and N is the total number of frequency domain subcarriers;
- i ranges from 0 to the total number of transmit channels in the RRU minus one;
- i, k is an integer greater than or equal to 0, and N is a positive integer.
- the compensation coefficient determining unit 43 is specifically configured to calculate an initial correction compensation coefficient of each channel according to a frequency domain channel response of each channel;
- the BBU uses the initial correction compensation coefficient of the transmission channel corresponding to the minimum channel delay as a reference reference to determine the compensation coefficient of each transmission channel.
- the compensation coefficient determining unit 43 is specifically configured to rectify the frequency domain channel response of each channel to obtain an initial correction compensation coefficient of each channel.
- the compensation coefficient determining unit 43 is specifically configured to divide the initial correction compensation coefficient of each channel by the initial correction compensation coefficient of the transmission channel corresponding to the minimum channel delay, and obtain the compensation coefficient of each channel. .
- the BBU is connected to multiple RRUs
- the receiving unit 41 is configured to receive, according to the correction reference channel in each RRU, each received signal, where each received signal is sent by the BBU to each of the plurality of RRUs, and then sent to the RRU.
- Each channel of the transmission corresponds to the output signal.
- FIG. 3 is a schematic structural diagram of an antenna system according to an embodiment of the present invention, including an antenna 1. RRU2 and BBU3;
- the RRU2 includes a correction reference channel and a multi-channel transmission channel, and the correction reference channel is respectively connected to the antenna and the BBU3; the multi-channel transmission channel is connected in parallel between the antenna and the BBU3;
- BBU3 is used to correct the compensation for each channel in RRU2, including:
- the BBU3 receives each received signal from the corrected reference channel in the RRU2, and each received signal is a signal corresponding to each of the transmit channels after the BBU3 sends a transmit correction reference signal to each of the RRU2 transmit channels;
- the BBU3 determines the channel delay of each channel according to the received signals of each channel
- the BBU3 uses the transmission channel corresponding to the minimum channel delay as the transmission reference channel to determine the compensation coefficient of each channel.
- the BBU3 performs correction compensation for each transmission channel according to the compensation coefficient of each transmission channel
- the number of channels of each received signal is a positive integer greater than 1, and the number of channels of the received signal is equal to the number of channels of the transmitting channel.
- the BBU 3 is specifically configured to calculate a frequency domain channel response of each channel according to the received signals, and determine a channel delay of each channel according to a frequency domain channel response of each channel. .
- BBU3 is specifically used according to the formula. Calculating the frequency domain channel response of each transmission channel separately;
- s tx,i (k) represents a corrected reference signal transmitted by the BBU 3 to the i-th transmit channel in the RRU 2 ;
- r rxc,i (k) represents the reception corresponding to the i-th transmit channel received by the corrected reference channel Signal;
- k represents the frequency domain subcarrier number, k ranges from 0 to N-1, and N is the total number of frequency domain subcarriers;
- i ranges from 0 to the total number of transmit channels in the RRU minus one;
- i, k is an integer greater than or equal to 0, and N is a positive integer.
- the BBU 3 is specifically configured to calculate an initial correction compensation coefficient of each channel according to a frequency domain channel response of each channel, and is also specifically used for initializing a channel corresponding to the minimum channel delay.
- the correction compensation coefficient is used as a reference reference to determine the compensation coefficient of each transmission channel.
- the BBU3 is specifically configured to use the frequency domain channel response of each transmission channel. Take the reciprocal and get the initial correction compensation coefficient of each channel.
- the BBU 3 is specifically configured to divide the initial correction compensation coefficient of each transmission channel by the initial correction compensation coefficient of the transmission channel corresponding to the minimum channel delay to obtain the compensation coefficient of each transmission channel.
- the BBU 3 is connected to multiple RRUs 2;
- the BBU3 is specifically configured to receive each received signal from the correction reference channel in each RRU2, and each received signal is a BBU3 transmitting a transmission correction reference signal to each of the plurality of RRU2, and each of the multiple RRU2
- the transmit channels correspond to the output signals.
- the signal channel correction compensation device 1100 includes a communication interface 1101, a memory 1103, and a processor 1102.
- the communication interface 1101 The processor 1102 and the memory 1103 are connected to each other through a bus 1104.
- the bus 1104 may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus.
- PCI peripheral component interconnect
- EISA extended industry standard architecture
- the bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 11, but it does not mean that there is only one bus or one type of bus.
- the communication interface 1101 is for communicating with the transmitting end.
- the memory 1103 is configured to store a program.
- the program can include program code, the program code including computer operating instructions.
- the memory 1103 may include a random access memory (RAM), and may also include a non-volatile memory, such as at least one disk storage.
- the processor 1102 executes the program stored in the memory 1103 to implement the method of the foregoing method embodiment of the present invention:
- each received signal from the correction reference channel in the radio remote unit RRU is a signal corresponding to each of the transmission channels after transmitting a transmission correction reference signal to each of the RRU transmission channels;
- the transmission channel corresponding to the minimum channel delay is used as the transmission reference channel to determine the compensation coefficient of each channel;
- Correction compensation is performed for each transmission channel according to the compensation coefficient of each transmission channel
- the number of channels of each received signal is a positive integer greater than 1, and the number of channels of the received signal is equal to the number of channels of the transmitting channel.
- the processor 1102 may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP Processor, etc.), or a digital signal processor (DSP), an application specific integrated circuit. (ASIC), Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component.
- CPU central processing unit
- NP Processor network processor
- DSP digital signal processor
- ASIC application specific integrated circuit
- FPGA Field Programmable Gate Array
- the signal channel correction compensation method, device, system and device can obtain the compensation channel of the signal channel, and use the transmission channel corresponding to the minimum channel delay as the transmission reference channel, which can effectively avoid the current receiving segment. Contains the occurrence of the next fragment symbol sample condition, avoiding the resulting ISI.
- the aforementioned program can be stored in a computer readable storage medium.
- the program when executed, performs the steps including the foregoing method embodiments; and the foregoing storage medium includes various media that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.
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Abstract
Embodiments of the present invention relate to wireless communication technologies, and particularly to a signal channel correction compensation method, apparatus and system. The method comprises: a baseband unit (BBU) receives received signals from correction reference channels of a remote radio unit (RRU), the received signals being signals outputted corresponding to transmission channels after the BBU sends transmission correction reference signals to the transmission channels in the RRU; the BBU determines channel delays of the transmission channels according to the received signals; the BBU determines compensation coefficients of the transmission channels by using a transmission channel corresponding to a minimum channel delay as a transmission reference channel; and the BBU performs correction compensation on the transmission channels according to the compensation coefficients of the transmission channels, the number of the received signals being a positive integer greater than 1, and the number of the received signals being equal to the number of the transmission channels. The signal channel correction compensation method, apparatus and system in the present invention can effectively reduce inter-symbol interference of received signals.
Description
本发明实施例涉及无线通信技术,尤其涉及一种信号通道校正补偿方法、装置和***。Embodiments of the present invention relate to a wireless communication technology, and in particular, to a signal channel correction compensation method, apparatus, and system.
无线通信***中,通过天线***发射接收各类数据信号。以LTE(Long Term Evolution,长期演进)***MIMO(Multiple-Input-Multiple-Output,多天线输入多天线输出***)发射方式中所采用的天线***为例,图1示出了现有技术中天线***的结构示意图。从图1中可以看出,天线***的主要结构包括天线1、RRU2(Radio Remote Unit,射频拉远单元)以及BBU3(Base Band Unit,基带单元),其中在RRU2中包括多路信号通道,其中每路信号通道包括发射通道以及接收通道。上述天线***发射信号过程中,为了保证较高的信号发射质量,各路发射通道需满足一定的发射要求,如各路发射通道的时延和相位在空口对齐,又如,各路信号通道的接收通道和发射通道的信道响应的比值相等。In a wireless communication system, various types of data signals are transmitted and received through an antenna system. An antenna system used in a MIMO (Multiple-Input-Multiple-Output) MIMO (Multiple-Input-Multiple-Output) system is taken as an example. FIG. 1 shows an antenna in the prior art. Schematic diagram of the system. It can be seen from FIG. 1 that the main structure of the antenna system includes an antenna 1, a RRU 2 (Radio Remote Unit), and a BBU 3 (Base Band Unit), wherein the RRU 2 includes multiple signal channels, where Each signal channel includes a transmission channel and a reception channel. In the process of transmitting signals by the above antenna system, in order to ensure a high signal transmission quality, each transmission channel needs to meet certain emission requirements, for example, the delay and phase of each transmission channel are aligned in the air interface, and, for example, the signal channels of each channel The ratio of the channel responses of the receive channel and the transmit channel are equal.
实际的天线***中,由于收发通道中频部分抖动以及射频模拟器件响应的不一致性,各发射通道难以自动满足上述发射要求。为了使各发射通道满足发射要求,一般的,在RRU2中设置校正参考通道,通过校正参考通道配合信号补偿算法,确定各发射信道的补偿系数,之后根据各发射通道的补偿系数对各发射通道进行补充校正。In the actual antenna system, due to the IF part jitter of the transceiver channel and the inconsistency of the response of the RF analog device, it is difficult for each transmission channel to automatically meet the above emission requirements. In order to make each transmission channel meet the transmission requirements, generally, a correction reference channel is set in the RRU2, and the compensation coefficient of each transmission channel is determined by correcting the reference channel with the signal compensation algorithm, and then the transmission channels are performed according to the compensation coefficients of the respective transmission channels. Supplementary correction.
采用现有的信道校正方法对发射通道校正补偿后,从接收通道接收的一个数据片段中有时会包含下一个数据片段中的符号样点,造成ISI(Inter-Symbol-Interference,符号间干扰)。After the channel correction is corrected by the existing channel correction method, a data segment received from the receiving channel sometimes includes symbol samples in the next data segment, resulting in ISI (Inter-Symbol-Interference).
发明内容
Summary of the invention
本发明实施例提供一种信号通道校正补偿方法、装置和***,以有效降低接收的信号的符号间干扰。Embodiments of the present invention provide a signal channel correction compensation method, apparatus, and system to effectively reduce inter-symbol interference of a received signal.
第一方面,本发明实施例提供了一种信号通道校正补偿方法,包括:In a first aspect, an embodiment of the present invention provides a signal channel correction compensation method, including:
基带单元BBU从射频拉远单元RRU中的校正参考通道中接收各路接收信号,所述各路接收信号为所述BBU向所述RRU中各路发射通道发送发射校正参考信号后,与所述各路发射通道分别对应输出的信号;The baseband unit BBU receives the received signals from the corrected reference channel in the radio remote unit RRU, and the received signals are sent by the BBU to the transmit channels of the RRUs. Each channel of the transmission corresponds to the output signal;
所述BBU根据所述各路接收信号,确定所述各路发射通道的通道时延;Determining, by the BBU, a channel delay of each of the transmitting channels according to the received signals of each path;
所述BBU以最小通道时延所对应的发射通道作为发射参考基准通道,确定所述各路发射通道的补偿系数;Determining, by the BBU, a transmission channel corresponding to the minimum channel delay as a transmission reference channel, and determining a compensation coefficient of each of the transmission channels;
所述BBU根据所述各路发射通道的补偿系数,对所述各路发射通道进行校正补偿;The BBU performs correction compensation on the transmission channels of the respective channels according to the compensation coefficients of the transmission channels of the respective channels;
其中,所述各路接收信号的路数为大于1的正整数,且接收信号的路数等于发射通道的路数。The number of paths of the received signals is a positive integer greater than 1, and the number of paths of the received signals is equal to the number of channels of the transmitting channel.
可选的,所述BBU根据所述各路接收信号,确定所述各路发射通道的通道时延,包括:Optionally, the BBU determines, according to the received signals of the respective paths, a channel delay of each of the transmitting channels, including:
所述BBU根据接收的所述各路接收信号分别计算所述各路发射通道的频域信道响应;The BBU calculates a frequency domain channel response of each of the transmission channels according to the received signals received by the BBUs;
所述BBU根据所述各路发射通道的频域信道响应,确定所述各路发射通道的通道时延。The BBU determines a channel delay of each of the transmit channels according to a frequency domain channel response of each of the transmit channels.
可选的,所述BBU根据接收的所述各路接收信号分别计算所述各路发射通道的频域信道响应,包括:Optionally, the BBU separately calculates frequency domain channel responses of the respective transmit channels according to the received received signals, including:
所述BBU按照公式分别计算所述各路发射通道的频域信道响应;The BBU according to the formula Calculating a frequency domain channel response of each of the transmission channels separately;
其中,stx,i(k)表示所述BBU向所述RRU中第i路发射通道上发射的校正参考信号;rrxc,i(k)表示校正参考通道接收到的与第i路发射通道所对应的接收信号;k表示频域子载波编号,k的取值范围从0到N-1,N为频域子载波总数;i的取值范围为0到所述RRU中发射通道总个数减一;i,k均为大于等于0的整数,N为正整数。
Where s tx,i (k) represents a corrected reference signal transmitted by the BBU to the i-th transmit channel of the RRU; r rxc,i (k) represents the received i-th transmit channel of the corrected reference channel The corresponding received signal; k represents the frequency domain subcarrier number, k ranges from 0 to N-1, and N is the total number of frequency domain subcarriers; i ranges from 0 to the total number of transmit channels in the RRU The number is reduced by one; i, k are integers greater than or equal to 0, and N is a positive integer.
可选的,所述BBU以最小通道时延所对应的发射通道作为发射参考基准通道,确定所述各路发射通道的补偿系数,包括:Optionally, the BBU uses a transmission channel corresponding to the minimum channel delay as a transmission reference channel, and determines a compensation coefficient of each channel, including:
所述BBU根据所述各路发射通道的频域信道响应,分别计算所述各路发射通道的初始校正补偿系数;The BBU calculates an initial correction compensation coefficient of each of the transmission channels according to a frequency domain channel response of each of the transmission channels;
所述BBU以最小通道时延所对应的发射通道的初始校正补偿系数为参考基准,确定所述各路发射通道的补偿系数。The BBU determines a compensation coefficient of each of the transmission channels by using an initial correction compensation coefficient of a transmission channel corresponding to the minimum channel delay as a reference.
可选的,所述BBU根据所述各路发射通道的频域信道响应,分别计算所述各路发射通道的初始校正补偿系数,包括:Optionally, the BBU calculates an initial correction compensation coefficient of each of the transmission channels according to the frequency domain channel response of each of the transmission channels, including:
所述BBU将所述各路发射通道的频域信道响应取倒数,得到所述各路发射通道的初始校正补偿系数。The BBU takes the frequency domain channel response of each of the transmission channels into a reciprocal to obtain an initial correction compensation coefficient of each of the transmission channels.
可选的,所述BBU以最小通道时延所对应的发射通道的初始校正补偿系数为参考基准,确定所述各路发射通道的补偿系数,包括:Optionally, the BBU determines, by using an initial correction compensation coefficient of the transmission channel corresponding to the minimum channel delay as a reference, determining a compensation coefficient of each of the transmission channels, including:
所述BBU将所述各路发射通道的初始校正补偿系数除以所述最小通道时延所对应的发射通道的初始校正补偿系数,得到所述各路发射通道的补偿系数。The BBU divides an initial correction compensation coefficient of each of the transmission channels by an initial correction compensation coefficient of the transmission channel corresponding to the minimum channel delay to obtain a compensation coefficient of each of the transmission channels.
可选的,所述BBU连接有多个RRU;Optionally, the BBU is connected to multiple RRUs;
所述基带单元BBU从射频拉远单元RRU中的校正参考通道中接收各路接收信号,包括:The baseband unit BBU receives the received signals from the corrected reference channel in the radio remote unit RRU, including:
所述BBU从各个所述RRU中的校正参考通道中接收各路接收信号,所述各路接收信号为所述BBU向所述多个RRU中的各路发射通道发送发射校正参考信号后,与所述多个RRU中各路发射通道分别对应输出的信号。The BBU receives each received signal from a corrected reference channel in each of the RRUs, and the received signals are sent by the BBU to the transmit channels of the plurality of RRUs, and then Each of the plurality of RRUs corresponds to an output signal.
第二方面,本发明实施例提供了一种信号通道校正补偿装置,所述装置部署于基带单元BBU中,包括:In a second aspect, an embodiment of the present invention provides a signal channel correction compensation apparatus, where the apparatus is deployed in a baseband unit BBU, and includes:
接收单元,用于从射频拉远单元RRU中的校正参考通道中接收各路接收信号,所述各路接收信号为所述BBU向所述RRU中各路发射通道发送发射校正参考信号后,与所述各路发射通道分别对应输出的信号;所述各路接收信号的路数为大于1的正整数,且接收信号的路数等于发射通道的路数;a receiving unit, configured to receive, according to a correction reference channel in the radio remote unit RRU, each received signal, where the received signal is sent by the BBU to each of the RRUs to send a transmission correction reference signal, and Each of the transmission channels respectively corresponds to an output signal; the number of channels of each received signal is a positive integer greater than 1, and the number of channels of the received signal is equal to the number of channels of the transmission channel;
通道时延确定单元,用于根据所述各路接收信号,确定所述各路发
射通道的通道时延;a channel delay determining unit, configured to determine, according to each received signal, each of the roads
Channel delay of the shot channel;
补偿系数确定单元,用于以最小通道时延所对应的发射通道作为发射参考基准通道,确定所述各路发射通道的补偿系数;a compensation coefficient determining unit, configured to use a transmitting channel corresponding to the minimum channel delay as a transmitting reference reference channel, and determine a compensation coefficient of each of the transmitting channels;
校正补偿单元,用于根据所述各路发射通道的补偿系数,对所述各路发射通道进行校正补偿。And a correction compensation unit, configured to perform correction compensation on the respective transmission channels according to the compensation coefficients of the respective transmission channels.
可选的,所述通道时延确定单元,具体用于根据接收的所述各路接收信号分别计算所述各路发射通道的频域信道响应;根据所述各路发射通道的频域信道响应,确定所述各路发射通道的通道时延。Optionally, the channel delay determining unit is configured to separately calculate a frequency domain channel response of each of the transmitting channels according to the received received signals, and according to the frequency domain channel response of each of the transmitting channels And determining a channel delay of each of the transmitting channels.
可选的,所述通道时延确定单元,具体用于按照公式分别计算所述各路发射通道的频域信道响应;Optionally, the channel delay determining unit is specifically configured according to a formula Calculating a frequency domain channel response of each of the transmission channels separately;
其中,stx,i(k)表示所述BBU向所述RRU中第i路发射通道上发射的校正参考信号;rrxc,i(k)表示校正参考通道接收到的与第i路发射通道所对应的接收信号;k表示频域子载波编号,k的取值范围从0到N-1,N为频域子载波总数;i的取值范围为0到所述RRU中发射通道总个数减一;i,k均为大于等于0的整数,N为正整数。Where s tx,i (k) represents a corrected reference signal transmitted by the BBU to the i-th transmit channel of the RRU; r rxc,i (k) represents the received i-th transmit channel of the corrected reference channel The corresponding received signal; k represents the frequency domain subcarrier number, k ranges from 0 to N-1, and N is the total number of frequency domain subcarriers; i ranges from 0 to the total number of transmit channels in the RRU The number is reduced by one; i, k are integers greater than or equal to 0, and N is a positive integer.
可选的,所述补偿系数确定单元,具体用于根据所述各路发射通道的频域信道响应,分别计算所述各路发射通道的初始校正补偿系数;Optionally, the compensation coefficient determining unit is specifically configured to separately calculate an initial correction compensation coefficient of each of the transmitting channels according to a frequency domain channel response of each of the transmitting channels;
所述BBU以最小通道时延所对应的发射通道的初始校正补偿系数为参考基准,确定所述各路发射通道的补偿系数。The BBU determines a compensation coefficient of each of the transmission channels by using an initial correction compensation coefficient of a transmission channel corresponding to the minimum channel delay as a reference.
可选的,所述补偿系数确定单元,具体用于将所述各路发射通道的频域信道响应取倒数,得到所述各路发射通道的初始校正补偿系数。Optionally, the compensation coefficient determining unit is configured to recalculate the frequency domain channel response of each of the transmitting channels to obtain an initial correction compensation coefficient of each of the transmitting channels.
可选的,所述补偿系数确定单元,具体用于将所述各路发射通道的初始校正补偿系数除以所述最小通道时延所对应的发射通道的初始校正补偿系数,得到所述各路发射通道的补偿系数。Optionally, the compensation coefficient determining unit is specifically configured to divide an initial correction compensation coefficient of each of the transmission channels by an initial correction compensation coefficient of a transmission channel corresponding to the minimum channel delay, to obtain the respective paths. The compensation factor of the transmit channel.
可选的,所述BBU连接有多个RRU;Optionally, the BBU is connected to multiple RRUs;
所述接收单元,具体用于从各个所述RRU中的校正参考通道中接收各路接收信号,所述各路接收信号为所述BBU向所述多个RRU中的各路发射通道发送发射校正参考信号后,与所述多个RRU中各路发射通道分别对应输出的信号。The receiving unit is configured to receive, according to a correction reference channel in each of the RRUs, a received signal, where each received signal sends a transmission correction to each of the plurality of RRUs by the BBU. After the reference signal, the output signals corresponding to the respective transmission channels of the plurality of RRUs are respectively corresponding.
第三方面,本发明实施例提供了一种天线***,包括天线、射频拉
远单元RRU以及基带单元BBU;In a third aspect, an embodiment of the present invention provides an antenna system, including an antenna and a radio frequency pull.
Far unit RRU and baseband unit BBU;
所述RRU中包括校正参考通道以及多路发射通道,所述校正参考通道分别与所述天线以及所述BBU连接;所述多路发射通道并联于所述天线与所述BBU之间;The RRU includes a correction reference channel and a plurality of transmission channels, wherein the correction reference channel is respectively connected to the antenna and the BBU; and the multiple transmission channel is connected in parallel between the antenna and the BBU;
所述BBU,用于对所述RRU中的所述各路发射通道进行校正补偿,包括:The BBU is configured to perform correction compensation on the respective transmit channels in the RRU, including:
所述BBU从所述RRU中的校正参考通道中接收各路接收信号,所述各路接收信号为所述BBU向所述RRU中各路发射通道发送发射校正参考信号后,与所述各路发射通道分别对应输出的信号;Receiving, by the BBU, the received signals from the corrected reference channel in the RRU, where the received signals are sent by the BBU to the transmit channels of the RRUs, and the respective paths are The transmitting channels respectively correspond to the output signals;
所述BBU根据所述各路接收信号,确定所述各路发射通道的通道时延;Determining, by the BBU, a channel delay of each of the transmitting channels according to the received signals of each path;
所述BBU以最小通道时延所对应的发射通道作为发射参考基准通道,确定所述各路发射通道的补偿系数;Determining, by the BBU, a transmission channel corresponding to the minimum channel delay as a transmission reference channel, and determining a compensation coefficient of each of the transmission channels;
所述BBU根据所述各路发射通道的补偿系数,对所述各路发射通道进行校正补偿;The BBU performs correction compensation on the transmission channels of the respective channels according to the compensation coefficients of the transmission channels of the respective channels;
其中,所述各路接收信号的路数为大于1的正整数,且接收信号的路数等于发射通道的路数。The number of paths of the received signals is a positive integer greater than 1, and the number of paths of the received signals is equal to the number of channels of the transmitting channel.
可选的,所述BBU,具体用于根据接收的所述各路接收信号分别计算所述各路发射通道的频域信道响应;根据所述各路发射通道的频域信道响应,确定所述各路发射通道的通道时延。Optionally, the BBU is configured to separately calculate a frequency domain channel response of each channel according to the received signals, and determine, according to the frequency domain channel response of each channel The channel delay of each channel.
可选的,所述BBU,具体用于按照公式分别计算所述各路发射通道的频域信道响应;Optionally, the BBU is specifically used according to a formula Calculating a frequency domain channel response of each of the transmission channels separately;
其中,stx,i(k)表示所述BBU向所述RRU中第i路发射通道上发射的校正参考信号;rrxc,i(k)表示校正参考通道接收到的与第i路发射通道所对应的接收信号;k表示频域子载波编号,k的取值范围从0到N-1,N为频域子载波总数;i的取值范围为0到所述RRU中发射通道总个数减一;i,k均为大于等于0的整数,N为正整数。Where s tx,i (k) represents a corrected reference signal transmitted by the BBU to the i-th transmit channel of the RRU; r rxc,i (k) represents the received i-th transmit channel of the corrected reference channel The corresponding received signal; k represents the frequency domain subcarrier number, k ranges from 0 to N-1, and N is the total number of frequency domain subcarriers; i ranges from 0 to the total number of transmit channels in the RRU The number is reduced by one; i, k are integers greater than or equal to 0, and N is a positive integer.
可选的,所述BBU,具体用于根据所述各路发射通道的频域信道响应,分别计算所述各路发射通道的初始校正补偿系数;还具体用于以最小通道时延所对应的发射通道的初始校正补偿系数为参考基准,确定所
述各路发射通道的补偿系数。Optionally, the BBU is specifically configured to calculate an initial correction compensation coefficient of each of the transmission channels according to a frequency domain channel response of each of the transmission channels, and specifically configured to use a minimum channel delay. The initial correction compensation coefficient of the transmitting channel is the reference datum, and the determination is made.
The compensation coefficient of each channel is described.
可选的,所述BBU,具体用于将所述各路发射通道的频域信道响应取倒数,得到所述各路发射通道的初始校正补偿系数。Optionally, the BBU is specifically configured to rectify a frequency domain channel response of each of the transmit channels to obtain an initial correction compensation coefficient of each of the transmit channels.
可选的,所述BBU,具体用于将所述各路发射通道的初始校正补偿系数除以所述最小通道时延所对应的发射通道的初始校正补偿系数,得到所述各路发射通道的补偿系数。Optionally, the BBU is specifically configured to divide an initial correction compensation coefficient of each of the transmission channels by an initial correction compensation coefficient of the transmission channel corresponding to the minimum channel delay, to obtain the transmission channels of the respective transmission channels. Compensation factor.
可选的,所述BBU连接有多个RRU;Optionally, the BBU is connected to multiple RRUs;
所述BBU,具体用于从各个所述RRU中的校正参考通道中接收各路接收信号,所述各路接收信号为所述BBU向所述多个RRU中的各路发射通道发送发射校正参考信号后,与所述多个RRU中各路发射通道分别对应输出的信号。The BBU is specifically configured to receive, according to a correction reference channel in each of the RRUs, a received signal, where each received signal sends a transmission correction reference to each of the plurality of RRUs by the BBU. After the signal, corresponding to each of the plurality of RRUs, the output signals respectively correspond to the output signals.
第四方面,本发明实施例提供了一种信号通道校正补偿设备,该设备部署于天线***中,包括:In a fourth aspect, an embodiment of the present invention provides a signal channel correction and compensation device, where the device is deployed in an antenna system, including:
通信接口、存储器、处理器和通信总线,其中,所述通信接口、所述存储器和所述处理器通过所述通信总线通信;a communication interface, a memory, a processor, and a communication bus, wherein the communication interface, the memory, and the processor communicate via the communication bus;
所述存储器用于存放程序,所述处理器用于执行所述存储器存储的程序;当所述Openflow网络跨传统网络协议IP网络的拓扑学习装置运行时,所述处理器运行程序,所述程序包括:The memory is for storing a program, the processor is configured to execute the program stored by the memory; when the Openflow network runs across a topology learning device of a traditional network protocol IP network, the processor runs a program, and the program includes :
从射频拉远单元RRU中的校正参考通道中接收各路接收信号,所述各路接收信号为所述设备向所述RRU中各路发射通道发送发射校正参考信号后,与所述各路发射通道分别对应输出的信号;Receiving, by the correction reference channel in the radio remote unit RRU, each of the received signals, after the apparatus sends a transmission correction reference signal to each of the RRUs, and transmitting with each of the channels The channels respectively correspond to the output signals;
根据所述各路接收信号,确定所述各路发射通道的通道时延;Determining, according to each received signal, a channel delay of each of the transmitting channels;
以最小通道时延所对应的发射通道作为发射参考基准通道,确定所述各路发射通道的补偿系数;Determining, by using a transmission channel corresponding to the minimum channel delay as a transmission reference channel, a compensation coefficient of each of the transmission channels;
根据所述各路发射通道的补偿系数,对所述各路发射通道进行校正补偿;Correcting and compensating the respective transmission channels according to the compensation coefficients of the respective transmission channels;
其中,所述各路接收信号的路数为大于1的正整数,且接收信号的路数等于发射通道的路数。The number of paths of the received signals is a positive integer greater than 1, and the number of paths of the received signals is equal to the number of channels of the transmitting channel.
本发明实施例的信号通道校正补偿方法、装置、***和设备,在获取信号通道的补偿系数时,以最小通道时延所对应的发射通道作为发射
参考基准通道,可以有效避免在当前接收片段中包含下一个片段符号样点状况的发生,避免由此带来的ISI。The signal channel correction compensation method, device, system and device according to the embodiment of the present invention, when acquiring the compensation coefficient of the signal channel, use the transmission channel corresponding to the minimum channel delay as the transmission
The reference reference channel can effectively avoid the occurrence of the next fragment symbol sample condition in the current received segment, and avoid the resulting ISI.
为了更清楚地说明本发明实施例或现有技术中的技术方案,下面将对实施例或现有技术描述中所需要使用的附图作一简单地介绍,显而易见地,下面描述中的附图是本发明的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动性的前提下,还可以根据这些附图获得其他的附图。In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any inventive labor.
图1示出了现有技术中天线***的结构示意图;1 is a schematic structural view of an antenna system in the prior art;
图2示出了天线***的另一种结构示意图;Figure 2 shows another structural schematic of the antenna system;
图3示出了天线***的另一种种结构示意图;FIG. 3 shows another structural diagram of the antenna system;
图4示出了天线***的又一种结构示意图;Figure 4 shows a further schematic structural view of the antenna system;
图5示出了信号通道校正补偿的效果示意图;FIG. 5 is a schematic diagram showing the effect of signal channel correction compensation;
图6示出了本发明实施例信号通道校正补偿方法的流程图;6 is a flow chart showing a signal channel correction compensation method according to an embodiment of the present invention;
图7示出了本发明实施例信号通道校正补偿方法的另一种流程图;FIG. 7 is another flow chart showing a signal channel correction compensation method according to an embodiment of the present invention;
图8示出了单个小区中包括多个RRU的结构示意图;FIG. 8 is a schematic structural diagram showing a plurality of RRUs in a single cell;
图9示出了本发明实施例信号通道校正补偿方法的又一种流程图;FIG. 9 is still another flowchart of a signal channel correction compensation method according to an embodiment of the present invention;
图10示出了本发明实施例信号通道校正补偿装置的结构示意图;FIG. 10 is a schematic structural diagram of a signal channel correction compensation apparatus according to an embodiment of the present invention; FIG.
图11示出了本发明实施例信号通道校正补偿设备的结构示意图。FIG. 11 is a schematic structural diagram of a signal channel correction compensation apparatus according to an embodiment of the present invention.
为使本发明实施例的目的、技术方案和优点更加清楚,下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。The technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.
本发明实施例中以LTE***MIMO发射方式中所采用的天线***为例,对本发明实施例的信号信道校正方法进行详细说明。In the embodiment of the present invention, an antenna system used in the MIMO transmission mode of the LTE system is taken as an example, and a signal channel correction method according to an embodiment of the present invention is described in detail.
在图1天线***的结构基础上,图2示出了天线***的另一种结构示
意图。Based on the structure of the antenna system of FIG. 1, FIG. 2 shows another structure of the antenna system.
intention.
从图2可以看出,天线***的主要结构包括天线1、RRU2及BBU3,其中在RRU2中包括多路信号通道,每路信号通道均包括接收通道以及发射通道,图2中所示的天线***中的RRU2包括四路信号通道,如在第0路信号通道中包括发射通道以及接收通道,其中在发射通道中包括发射电路TX0,发射电路TX0通过CPRI(Common Public Radio Interface,通用公共无线电接口)与BBU3的收发接口TRX0连接,通过并路模块与天线1连接;在接收通道中包括接收电路RX0,接收电路RX0通过CPRI与BBU3的收发接口TRX0连接,通过并路模块与天线1连接。As can be seen from FIG. 2, the main structure of the antenna system includes antenna 1, RRU2 and BBU3, wherein multiple signal channels are included in RRU2, and each signal channel includes a receiving channel and a transmitting channel, and the antenna system shown in FIG. The RRU2 includes four signal channels, such as a transmission channel and a reception channel in the 0th signal channel, wherein the transmission channel includes a transmission circuit TX0, and the transmission circuit TX0 passes a CPRI (Common Public Radio Interface). It is connected to the transceiver interface TRX0 of the BBU3, and is connected to the antenna 1 through the parallel module; the receiving circuit includes a receiving circuit RX0, and the receiving circuit RX0 is connected to the transceiver interface TRX0 of the BBU3 through the CPRI, and is connected to the antenna 1 through the parallel module.
图2中,并路模块是用于分隔开接收通道和发射通道的电子器件,其具体可以为双工器、开关电路或者环形器等。In FIG. 2, the parallel circuit module is an electronic device for separating the receiving channel and the transmitting channel, and may specifically be a duplexer, a switch circuit or a circulator.
RRU2中包括的其它路信号通道的连接结构与第0路信号通道的连接结构相同,不再一一赘述。The connection structure of the other road signal channels included in the RRU 2 is the same as the connection structure of the 0th signal channel, and will not be described again.
LTE***利用图2中所示的天线***进行MIMO发射的方式有两种,分别为BF(Beamforming,波束赋形)发射方式和CL-MIMO(闭环MIMO,Closed-Loop MIMO)发射方式,BF发射方式和CL-MIMO发射方式通过在基站侧进行加权发射,使得多个发射天线1的信号在接收时形成相干叠加,从而获得阵列增益,提高用户的SINR(Signal to Interference plus Noise Ratio,信噪比)。The LTE system uses the antenna system shown in Figure 2 for MIMO transmission in two ways, namely BF (Beamforming) and CL-MIMO (Closed-Loop MIMO) transmission, BF transmission. The mode and the CL-MIMO transmission mode perform weighted transmission on the base station side, so that the signals of the plurality of transmit antennas 1 form a coherent superposition at the time of reception, thereby obtaining an array gain and improving the SINR (Signal to Interference plus Noise Ratio) of the user. ).
无论是BF发射技术还是CL-MIMO发射技术,为了得到较高的发射质量,天线***中的发射信道都需要满足一定的发射条件。Whether it is BF transmission technology or CL-MIMO transmission technology, in order to obtain higher transmission quality, the transmission channel in the antenna system needs to meet certain transmission conditions.
例如,CL-MIMO发射技术中要求保证每个发射通道的时延和相位在空口对齐,用公式表示即为:For example, in the CL-MIMO transmission technology, it is required to ensure that the delay and phase of each transmission channel are aligned in the air interface, which is expressed by the formula:
htx,0(k)=htx,1(k)=…=htx,3(k)h tx,0 (k)=h tx,1 (k)=...=h tx,3 (k)
上述公式中,htx,0(k)~htx,3(k)分别表示发射信道0~发射信道3的频域信道响应,k表示频域子载波编号,取值范围从0到Nfft-1,其中Nfft为频域子载波总数。In the above formula, h tx,0 (k) to h tx,3 (k) respectively represent the frequency domain channel response of the transmission channel 0 to the transmission channel 3, and k represents the frequency domain subcarrier number, ranging from 0 to Nfft- 1, where Nfft is the total number of frequency domain subcarriers.
或者在CL-MIMO发射技术中,通过在时延或频域补偿达到发射通道响应一致,用公式表示即为:Or in the CL-MIMO transmission technology, the response of the transmission channel is consistent by delay or frequency domain compensation, which is expressed by the formula:
βtx,0×htx,0(k)=βtx,1×htx,1(k)=…=βtx,3×htx,3(k)
β tx,0 ×h tx,0 (k)=β tx,1 ×h tx,1 (k)=...=β tx,3 ×h tx,3 (k)
其中,βtx,0~βtx,3分别表示发射信道0~发射信道3的校正补偿系数。Wherein, β tx, 0 to β tx, 3 respectively represent correction compensation coefficients of the transmission channel 0 to the transmission channel 3.
又例如,BF发射技术中,要求每个接收通道和发射通道信道响应的比值相等即满足公式:
For another example, in the BF transmission technology, it is required that the ratio of the channel response of each receiving channel and the transmitting channel is equal, that is, the formula is satisfied:
其中,hrx,0(k)~hrx,3(k)分别表示接收信道0~接收信道3的频域信道响应,k表示频域子载波编号,取值范围从0到Nfft-1,其中Nfft为频域子载波总数。Where h rx,0 (k) to h rx,3 (k) respectively represent the frequency domain channel response of the receiving channel 0 to the receiving channel 3, and k represents the frequency domain subcarrier number, ranging from 0 to Nfft-1, Where Nfft is the total number of frequency domain subcarriers.
或者在BF发射技术中,通过在时延或频域补偿达到发射通道响应一致,即按满足公式
Or in the BF transmission technology, the response of the transmission channel is consistent by delay or frequency domain compensation, that is, according to the formula
其中,βtx,0~βtx,3分别表示发射信道0~发射信道3的校正补偿系数,βrx,0~βrx,3分别表示接收信道0~接收信道3的校正补偿系数。 Here , β tx, 0 to β tx, 3 respectively indicate correction compensation coefficients of the transmission channel 0 to the transmission channel 3, and β rx, 0 to β rx, 3 respectively indicate correction compensation coefficients of the reception channel 0 to the reception channel 3.
由于收发通道中频部分FIFO(First In First Out,先入先出)抖动,射频模拟器件响应的不一致性,在不进行频域或时域信道补偿的情况下无法保证通道自身完成对齐,所以需要通过信道补偿算法和硬件设计,获取校正补偿系数。Due to the IF (First In First Out) jitter of the IF part of the transceiver channel, the inconsistency of the response of the RF analog device does not guarantee the alignment of the channel itself without frequency domain or time domain channel compensation, so the channel needs to be passed. Compensation algorithm and hardware design to obtain correction compensation coefficient.
本发明实施例中获取校正补偿系数的方法包括设计额外的校正参考通道4。The method of obtaining the correction compensation coefficient in the embodiment of the present invention includes designing an additional correction reference channel 4.
如图3示出了天线***的另一种结构示意图,为了获取信号信道的校正补偿系数,在天线***的结构中增加了耦合电路5以及校正参考通道4,具体的,耦合电路5设置在天线内部,属于一种外校正方法,在该种校正方法下,发射通道包含RRU2里面的TX(transmitter,发射)电路和馈线6,接收通道包含RRU2里面的RX(Receiver,接收)电路和馈线6,如第0路发射通道包括发射电路TX0及馈线6,第0路接收通道包括接收电路RX0及馈线6,此种方式下,耦合电路5设置在天线里面,可以完成TX电路以及馈线的校正。FIG. 3 shows another structural diagram of the antenna system. In order to obtain the correction compensation coefficient of the signal channel, the coupling circuit 5 and the correction reference channel 4 are added to the structure of the antenna system. Specifically, the coupling circuit 5 is disposed on the antenna. Internally, it belongs to an external correction method. Under this correction method, the transmitting channel includes a TX (transmitter) circuit and a feeder 6 in the RRU2, and the receiving channel includes an RX (Receiver) circuit and a feeder 6 in the RRU2. For example, the 0th channel includes a transmitting circuit TX0 and a feeder 6. The 0th receiving channel includes a receiving circuit RX0 and a feeder 6. In this manner, the coupling circuit 5 is disposed inside the antenna to complete the correction of the TX circuit and the feeder.
如图4示出了天线***的又一种结构示意图,与图3所不同的是,该种方式下,天线***中增加的耦合电路5设置于RRU内部,属于一种内校正方法,在该种校正方法下,发射通道包含RRU2里面的TX电路,接收通道包含RRU2里面的RX电路,如第0路发射通道包括发射电路
TX0,第0路接收通道包括接收电路RX0。此种方式下,耦合电路设置在RRU内部,从RRU出口(内部)引信号到耦合电路5,完成TX电路的校正,外部馈线只能通过施工约束来保证。FIG. 4 is a schematic structural diagram of another antenna system. The difference from FIG. 3 is that, in this manner, the added coupling circuit 5 in the antenna system is disposed inside the RRU, and belongs to an internal calibration method. Under the correction method, the transmitting channel includes a TX circuit in the RRU2, and the receiving channel includes an RX circuit in the RRU2, such as the 0th transmitting channel including the transmitting circuit.
TX0, the 0th channel receiving channel includes the receiving circuit RX0. In this way, the coupling circuit is disposed inside the RRU, and the signal is led from the RRU outlet (internal) to the coupling circuit 5 to complete the correction of the TX circuit, and the external feeder can only be guaranteed by the construction constraints.
图3及图4中,耦合电路5,可以是由功分/合路器构成的电路,其中图4中耦合电路5通过定向耦合器与各发射通道的输出端连接。In FIGS. 3 and 4, the coupling circuit 5 may be a circuit composed of a power dividing/combiner, wherein the coupling circuit 5 in FIG. 4 is connected to the output ends of the respective transmitting channels through a directional coupler.
图3及图4中,校正参考通道4包括发射电路TXc以及接收电路RXc,其中,BBU3向发射电路TXc中发送接收校正参考信号,并经耦合电路5及天线1后,BBU3从RRU2的各个接收信道中接收反馈信号,并根据反馈信号获取各个接收信道的补偿系数。In FIG. 3 and FIG. 4, the correction reference channel 4 includes a transmitting circuit TXc and a receiving circuit RXc, wherein the BBU3 transmits and receives a correction reference signal to the transmitting circuit TXc, and after receiving the coupling circuit 5 and the antenna 1, the BBU3 receives each of the RRUs 2 The feedback signal is received in the channel, and the compensation coefficients of the respective receiving channels are obtained according to the feedback signal.
校正参考通道4中的接收电路RXc用于接收耦合电路5输出的信号,并向BBU3输出接收信号,以使BBU3根据接收信号对RRU中的各发射通道进行校正,以下将对发射通道的校正过程进行详细说明,此处不再赘述。The receiving circuit RXc in the correction reference channel 4 is for receiving the signal output from the coupling circuit 5, and outputting the reception signal to the BBU 3, so that the BBU 3 corrects each transmission channel in the RRU according to the received signal, and the following will correct the transmission channel. Detailed description will not be repeated here.
图3及图4所示的两种天线***中,虽然发射通道和接收通道定义的范围不同,但实现本发明实施例提供的信号通道校正的方法是相同的,以下将以图3所示的天线***为例对本发明实施例的信号通道校正补偿方法进行详细说明。In the two antenna systems shown in FIG. 3 and FIG. 4, although the ranges defined by the transmitting channel and the receiving channel are different, the method for implementing the signal channel correction provided by the embodiment of the present invention is the same, and the following will be shown in FIG. The antenna system is taken as an example to describe the signal channel correction compensation method in the embodiment of the present invention.
利用图3所示的天线***进行发射信道校正的时候,BBU3控制校正启动,向各路发射通道发送发射校正参考信号,在图3中BBU3通过收发接口TRX0向发射电路TX0发送发射校正参考信号,通过收发接口TRX1向发射电路TX1发送发射校正参考信号,通过收发接口TRX2向发射电路TX2发送发射校正参考信号,通过收发接口TRX3向发射电路TX3发送发射校正参考信号。本方法中,BBU3可以采用频分、时分或者空分等方式向发射通道发送发射校正参考信号。When the transmission channel correction is performed by using the antenna system shown in FIG. 3, the BBU3 control calibration is started, and a transmission correction reference signal is sent to each transmission channel. In FIG. 3, the BBU3 transmits a transmission correction reference signal to the transmission circuit TX0 through the transceiver interface TRX0. The transmission correction reference signal is sent to the transmission circuit TX1 through the transceiver interface TRX1, the transmission correction reference signal is transmitted to the transmission circuit TX2 through the transceiver interface TRX2, and the transmission correction reference signal is transmitted to the transmission circuit TX3 through the transceiver interface TRX3. In the method, the BBU3 may transmit a transmission correction reference signal to the transmission channel by means of frequency division, time division or space division.
BBU3向四路发射通道所发送的发射校正参考信号通过耦合电路5聚合后传输至校正参考通道4,BBU3从校正参考信道中接收与各发射通道所一一对应的接收信息,假定各接收通道的信号分别为rrxc,0(k),rrxc,1(k),rrxc,2(k),rrxc,3(k),通过LS(Least Square,最小均方)信道估计可以得到各路发射通道的频域信道响应,其中LS信道估计的公式为:
The transmission correction reference signal sent by the BBU3 to the four-way transmission channel is aggregated by the coupling circuit 5 and transmitted to the correction reference channel 4, and the BBU3 receives the reception information corresponding to each transmission channel from the correction reference channel, assuming that each reception channel The signals are r rxc,0 (k), r rxc,1 (k), r rxc,2 (k), r rxc,3 (k), which can be obtained by LS (Least Square) channel estimation. The frequency domain channel response of the channel transmission channel, where the formula for the LS channel estimation is:
其中,为第i路发射信道的频域信道估计响应,rrxc,i(k)为通过校正参考通道4接收到的第i路接收信号,stx,i(k)为BBU3发射的第i路校正参考信号,其中在图3所示的天线***中,i的取值为0~3。among them, For the frequency domain channel estimation response of the i-th transmit channel, r rxc,i (k) is the i-th receive signal received through the corrected reference channel 4, and s tx,i (k) is the i-th path correction of the BBU3 transmission. The reference signal, wherein in the antenna system shown in FIG. 3, the value of i is 0 to 3.
其中,hrxc(k)为校正参考接收通道的信道响应;htx,i(k)为第i路发射通道的信道响应。Where h rxc (k) is the channel response of the corrected reference receive channel; h tx,i (k) is the channel response of the i-th transmit channel.
通过对各个取倒数可以得到初始校正补偿系数,即根据公式求取第i路发射通道的初始校正补偿系数,其中在利用求取初始校正补偿系数之前,可以对进行降噪处理以提高获取的初始校正补偿系数的精度。Through each The rectification number can be used to obtain the initial correction compensation coefficient, that is, according to the formula Obtain the initial correction compensation coefficient of the i-th channel, which is utilized Before obtaining the initial correction compensation coefficient, you can Noise reduction processing is performed to improve the accuracy of the acquired initial correction compensation coefficient.
进一步的,为了避免校正参考通道4带来的额外时延引入,在得到初始校正补偿系数后,采用一发射通道作为参考基准对获得的各路校正补偿系数进行相对校正,一般的采用通道0作为参考基准进行相对校正,即:Further, in order to avoid the introduction of the additional delay caused by the correction of the reference channel 4, after obtaining the initial correction compensation coefficient, a correction channel is used as a reference reference to correct the correction coefficients of each channel, and generally adopts channel 0 as the reference. Relative correction with reference to the reference, ie:
由于RRU2通道之间的时延差较小,采用通道0作为参考基准不会带来较大的问题,但对于个别RRU2,或者是RRU2双拼构成单个小区时,需要进行特别考虑。Since the delay difference between the RRU2 channels is small, using channel 0 as a reference reference does not cause a big problem, but special consideration is required for individual RRU2 or RRU2 double-combination to form a single cell.
如图5示出了信号通道校正补偿的效果示意图,从图中可以看出在采用通道0作为参考基准时,通道0可以采用的校正补偿方式包括:倒数补偿、最小时延补偿以及最大时延补偿;其中当采用最大时延通道作为参考基准进行相对校正,则在接收端当前的OFDM(Orthogonal Frequency Division Multiplexing,正交频分复用)数据中会接收到下一个OFDM的符号样点,导致ISI。Figure 5 shows the effect of signal channel correction compensation. It can be seen from the figure that when channel 0 is used as the reference reference, the correction compensation methods that channel 0 can use include: reciprocal compensation, minimum delay compensation, and maximum delay. Compensation; wherein when the maximum delay channel is used as a reference reference for relative correction, the next OFDM symbol sample is received in the current OFDM (Orthogonal Frequency Division Multiplexing) data at the receiving end, resulting in ISI.
为了解决上述问题,本发明实施例提出了一种信号通道校正补偿方法,该方法在获取信号通道的补偿系数时,以最小通道时延所对应的发
射通道作为发射参考基准通道,可以有效避免在当前接收片段中包含下一个片段符号样点状况的发生,避免由此带来的ISI。In order to solve the above problem, an embodiment of the present invention provides a signal channel correction compensation method, which is configured to use a minimum channel delay when acquiring a compensation coefficient of a signal channel.
As the transmitting reference channel, the channel can effectively avoid the occurrence of the next fragment symbol sample in the current receiving segment, and avoid the resulting ISI.
如图6示出了本发明实施例信号通道校正补偿方法的流程图,该方法的执行主体为BBU,主要处理步骤包括:FIG. 6 is a flowchart of a signal channel correction compensation method according to an embodiment of the present invention. The execution body of the method is a BBU, and the main processing steps include:
步骤S11:BBU从RRU中的校正参考通道中接收各路接收信号。Step S11: The BBU receives each received signal from the corrected reference channel in the RRU.
其中,各路接收信号为BBU向RRU中各路发射通道发送发射校正参考信号后,与各路发射通道分别对应输出的信号。Wherein, each received signal is a signal corresponding to each of the transmission channels after the BBU sends a transmission correction reference signal to each of the RRUs.
具体的,各路接收信号的路数为大于1的正整数,且接收信号的路数等于发射通道的路数。Specifically, the number of channels of each received signal is a positive integer greater than 1, and the number of channels of the received signal is equal to the number of channels of the transmitting channel.
具体的,BBU从RRU中的校正参考通道中接收各路接收信号的具体过程包括:Specifically, the specific process for the BBU to receive the received signals from the corrected reference channel in the RRU includes:
(1)BBU向RRU中的各路发射通道发送发射校正参考信号。(1) The BBU sends a transmission correction reference signal to each of the transmission channels in the RRU.
如图3中,BBU3向发射电路TX0、发射电路TX1……发射电路TX3中分别发送发射校正参考信号。As shown in FIG. 3, the BBU 3 transmits a transmission correction reference signal to the transmission circuit TX0, the transmission circuit TX1, ..., the transmission circuit TX3, respectively.
(2)BBU从RRU中的校正参考通道接收与各路发射通道分别一一对应的接收信号。(2) The BBU receives the received signals one-to-one corresponding to each of the transmission channels from the correction reference channel in the RRU.
如图3中,BBU3从校正参考通道的接收电路RXc中接收各路接收信号。As shown in FIG. 3, the BBU 3 receives each received signal from the receiving circuit RXc of the corrected reference channel.
步骤S12:BBU根据各路接收信号,确定各路发射通道的通道时延。Step S12: The BBU determines the channel delay of each transmission channel according to each received signal.
步骤S13:BBU以最小通道时延所对应的发射通道作为发射参考基准通道,确定各路发射通道的补偿系数。Step S13: The BBU uses the transmission channel corresponding to the minimum channel delay as the transmission reference reference channel, and determines the compensation coefficient of each channel.
步骤S14:BBU根据各路发射通道的补偿系数,对各路发射通道进行校正补偿。Step S14: The BBU performs correction compensation for each transmission channel according to the compensation coefficient of each transmission channel.
结合图5可以看出,本发明实施例中以最小通道时延所对应的发射通道作为发射参考基准通道时,可以有效避免在当前接收片段中包含下一个片段符号样点状况的发生,避免由此带来的ISI。As shown in FIG. 5, in the embodiment of the present invention, when the transmission channel corresponding to the minimum channel delay is used as the transmission reference channel, the occurrence of the next fragment symbol sample in the current received segment can be effectively avoided. This brings the ISI.
如图7示出了本发明实施例信号通道校正补偿方法的另一种流程图,该方法的执行主体为BBU,主要处理步骤包括:FIG. 7 is another flowchart of a signal channel correction compensation method according to an embodiment of the present invention. The execution body of the method is a BBU, and the main processing steps include:
步骤S21:BBU向RRU中的各路发射通道发送发射校正参考信号。Step S21: The BBU sends a transmission correction reference signal to each transmission channel in the RRU.
步骤S22:BBU从RRU中的校正参考通道接收与各路发射通道分别
一一对应的接收信号。Step S22: The BBU receives the corrected reference channel from the RRU and the respective transmit channels respectively.
One-to-one corresponding received signals.
步骤S23:BBU根据接收的接收信号分别计算各路发射通道的频域信道响应。Step S23: The BBU separately calculates a frequency domain channel response of each channel according to the received received signal.
BBU根据接收的各路接收信号分别计算各路发射通道的频域信道响应,包括:The BBU calculates the frequency domain channel response of each channel according to the received signals, including:
BBU按照公式分别计算各路发射通道的频域信道响应;BBU according to the formula Calculating the frequency domain channel response of each transmission channel separately;
其中,stx,i(k)表示BBU向RRU中第i路发射通道上发射的校正参考信号;rrxc,i(k)表示校正参考通道接收到的与第i路发射通道所对应的接收信号;k表示频域子载波编号,k的取值范围从0到N-1,N为频域子载波总数;i的取值范围为0到RRU中发射通道总个数减一;i,k均为大于等于0的整数,N为正整数。Where s tx,i (k) represents a corrected reference signal transmitted by the BBU to the i-th transmit channel in the RRU; r rxc,i (k) represents the receive corresponding to the i-th transmit channel received by the corrected reference channel Signal; k represents the frequency domain subcarrier number, k ranges from 0 to N-1, and N is the total number of frequency domain subcarriers; i ranges from 0 to the total number of transmit channels in the RRU minus one; i, k is an integer greater than or equal to 0, and N is a positive integer.
该公式经过简化为:其中,hrxc(k)为校正参考接收通道的信道响应;htx,i(k)为第i路发射通道的信道响应。The formula is simplified to: Where h rxc (k) is the channel response of the corrected reference receive channel; h tx,i (k) is the channel response of the i-th transmit channel.
步骤S24:BBU根据各路发射通道的频域信道响应,确定各路发射通道的通道时延。Step S24: The BBU determines the channel delay of each channel according to the frequency domain channel response of each channel.
本步骤中根据频域信道响应数值确定时域内各路发射通道的通道时延。In this step, the channel delay of each channel in the time domain is determined according to the frequency domain channel response value.
步骤S25:BBU根据各路发射通道的频域信道响应,分别计算各路发射通道的初始校正补偿系数。Step S25: The BBU calculates the initial correction compensation coefficients of the respective transmission channels according to the frequency domain channel responses of the respective transmission channels.
具体的,BBU将各路发射通道的频域信道响应取倒数,得到各路发射通道的初始校正补偿系数。Specifically, the BBU takes the frequency domain channel response of each channel to be reciprocal, and obtains an initial correction compensation coefficient of each channel.
本步骤中BBU根据公式求取第i路发射通道的初始校正补偿系数,其中在利用求取初始校正补偿系数之前,可以对进行降噪处理,以提高获取的初始校正补偿系数的精度。BBU in this step according to the formula Obtain the initial correction compensation coefficient of the i-th channel, which is utilized Before obtaining the initial correction compensation coefficient, you can Noise reduction processing is performed to improve the accuracy of the acquired initial correction compensation coefficient.
步骤S26:BBU以最小通道时延所对应的发射通道的初始校正补偿系数为参考基准,确定各路发射通道的补偿系数。Step S26: The BBU determines the compensation coefficient of each channel by using the initial correction compensation coefficient of the transmission channel corresponding to the minimum channel delay as a reference.
BBU将各路发射通道的初始校正补偿系数除以最小通道时延所对应的发射通道的初始校正补偿系数,得到各路发射通道的补偿系数。The BBU divides the initial correction compensation coefficient of each transmission channel by the initial correction compensation coefficient of the transmission channel corresponding to the minimum channel delay, and obtains the compensation coefficient of each transmission channel.
步骤S27:BBU根据各路发射通道的补偿系数,对各路发射通道进行
校正补偿。Step S27: The BBU performs the transmission channel of each channel according to the compensation coefficient of each channel.
Correct the compensation.
本发明实施一及实施例二的上述方法可以应用在单个小区单RRU的天线***中,也可以应用在单个小区多RRU的天线***中,例如,如图8所示,在一个天线***中包括两个RRU,其中每个RRU可以包括两路信号通道。The foregoing method of the first embodiment and the second embodiment of the present invention can be applied to an antenna system of a single cell and a single RRU, and can also be applied to an antenna system of a single cell and multiple RRUs. For example, as shown in FIG. 8, it is included in an antenna system. Two RRUs, each of which may include two signal channels.
当单个小区中包括多个RRU时,该多个RRU均与本小区中的BBU连接;在对多个RRU中的发射通道进行校正时,BBU从各个RRU中的校正参考通道中接收各路接收信号,其中各路接收信号为BBU向多个RRU中的各路发射通道发送发射校正参考信号后,与多个RRU中各路发射通道分别对应输出的信号。When a plurality of RRUs are included in a single cell, the multiple RRUs are connected to the BBUs in the local cell; when correcting the transmission channels in the multiple RRUs, the BBU receives the received channels from the corrected reference channels in the respective RRUs. The signal, wherein each received signal is a signal that is output by the BBU to each of the plurality of RRUs after transmitting the transmission correction reference signal to each of the plurality of RRUs.
BBU接收各个RRU输出的接收信号后,按照实施例一或实施例二的方法计算各路发射通道的校正补偿系数,校正补偿系数的计算方法与实施例一或实施例二中相同,不再赘述。After receiving the received signals of the RRUs, the BBU calculates the correction compensation coefficients of the transmission channels according to the method of the first embodiment or the second embodiment. The calculation method of the correction compensation coefficients is the same as that in the first embodiment or the second embodiment, and is not described again. .
图9示出了本发明实施例信号通道校正补偿方法的又一种流程图,该方法的执行主体为BBU,主要处理步骤包括:FIG. 9 is still another flowchart of a signal channel correction compensation method according to an embodiment of the present invention. The execution body of the method is a BBU, and the main processing steps include:
步骤S31:RRU启动,此时RRU内部通道由于温度,湿度等的变化,发射和接收通道的信道响应会产生波动。Step S31: The RRU is started. At this time, the channel response of the transmitting and receiving channels may fluctuate due to changes in temperature, humidity, and the like of the RRU internal channel.
步骤S32:BBU判断RRU启动时间是否超过X分钟。Step S32: The BBU determines whether the RRU startup time exceeds X minutes.
考虑到RRU发射通道和接收通道信道响应的波动,BBU等待信道响应稳定后启动通道校正。即BBU判断RRU启动时间是否超过x分钟,如果超过,意味着信道响应已经稳定,可以进行通道校正。Considering the fluctuation of the channel response of the RRU transmit channel and the receive channel, the BBU initiates channel correction after waiting for the channel response to stabilize. That is, the BBU determines whether the RRU startup time exceeds x minutes. If it exceeds, it means that the channel response has stabilized, and channel correction can be performed.
步骤S33:BBU触发RRU发射通道校正。Step S33: The BBU triggers the RRU transmission channel correction.
BBU向多个发射通道发送发射校正参考信号,具体的可以采用时分、频分、或码分等多种方式发送发射校正参考信号,发射校正参考信号经过RRU,经过天线,从耦合电路环回到校正参考接收通道上(有时该耦合电路直接从RRU内部环回,未经过天线,处理流程没有区别,不再单独说明),BBU对从校正参考接收通道获得的接收信号进行LS信道估计,可选的进行降噪滤波等操作后进行LS信道估计,并利用LS信道估计的结果获取各个发射通道的初始发射校正系数,其中初始发射校正系数取信道估计的倒数。
The BBU sends a transmission correction reference signal to multiple transmission channels. Specifically, the transmission correction reference signal may be sent in various manners such as time division, frequency division, or code division. The transmission correction reference signal passes through the RRU, and is looped back from the coupling circuit through the antenna. Correcting the reference receive channel (sometimes the coupling circuit loops back directly from the RRU, without passing through the antenna, the processing flow is no different, no longer separately stated), and the BBU performs LS channel estimation on the received signal obtained from the corrected reference receive channel, optionally The LS channel estimation is performed after performing operations such as noise reduction filtering, and the initial transmission correction coefficients of the respective transmission channels are obtained by using the result of the LS channel estimation, wherein the initial transmission correction coefficient takes the reciprocal of the channel estimation.
步骤S34:BBU根据获得的LS信道估计值,获得各个发射通道的通道时延,并取通道时延最小的通道作为发射参考基准通道,并利用参考基准通道的初始发射校正系数作为归一因子,对初始发射校正系数进行相对校正处理,也即所有的初始发射校正系数都除以参考基准通道的初始发射校正系数,获得第二校正补偿系数。Step S34: The BBU obtains the channel delay of each transmission channel according to the obtained LS channel estimation value, and takes the channel with the smallest channel delay as the transmission reference reference channel, and uses the initial transmission correction coefficient of the reference reference channel as a normalization factor. The initial correction correction coefficient is subjected to relative correction processing, that is, all the initial transmission correction coefficients are divided by the initial transmission correction coefficient of the reference reference channel to obtain a second correction compensation coefficient.
步骤S33及步骤S34中的初始校正补偿系数以及第二校正补偿系数的计算方法与实施例二中所列方法相同,不再赘述。The calculation methods of the initial correction compensation coefficient and the second correction compensation coefficient in the step S33 and the step S34 are the same as those in the second embodiment, and are not described again.
步骤S35:BBU触发RRU接收通道校正。Step S35: The BBU triggers the RRU receiving channel correction.
BBU向校正参考通道中的发射通道发送接收校正参考信号,接收校正参考信号经过RRU及天线,从耦合电路环回到RRU中的多个接收通道上(有时该耦合电路直接从RRU内部环回,未经过天线,处理流程没有区别,不再单独说明),BBU对从RRU中的各个接收通道获得的接收信号进行LS信道估计,可选的对接收信号进行降噪滤波等操作后再进行LS信道估计,之后BBU利用RRU中各个接收信道的LS信道估计结果确定各接收通道的初始接收校正系数,其中初始接收校正系数取信道估计的倒数。(FDD***可没有该步骤)The BBU sends a reception correction reference signal to the transmission channel in the correction reference channel, and receives the correction reference signal through the RRU and the antenna, and returns from the coupling circuit loop to the plurality of receiving channels in the RRU (sometimes the coupling circuit directly loops back from the RRU, The BBU does not separately distinguish the processing flow from the processing flow. It is estimated that the BBU then determines the initial reception correction coefficient of each reception channel by using the LS channel estimation result of each reception channel in the RRU, wherein the initial reception correction coefficient takes the reciprocal of the channel estimation. (The FDD system does not have this step)
步骤S36:BBU根据获得的LS信道估计值,取通道0(可随意取)作为接收参考基准通道,并利用接收参考基准通道的初始接收校正系数作为归一因子,对初始发射校正系数进行相对校正处理,也即所有的初始接收校正系数都除以参考基准通道的初始接收校正系数,获得第二接收校正系数;(FDD***可没有该步骤)Step S36: The BBU takes channel 0 (optional) as the reference reference channel according to the obtained LS channel estimation value, and uses the initial reception correction coefficient of the received reference reference channel as a normalization factor to perform relative correction on the initial transmission correction coefficient. Processing, that is, all initial reception correction coefficients are divided by the initial reception correction coefficient of the reference reference channel to obtain a second reception correction coefficient; (the FDD system may not have this step)
在完成初始校正之后,选择通道时延最小的通道作为参考基准通道做相对校正,避免校正补偿后带来的ISI。After the initial correction is completed, the channel with the smallest channel delay is selected as the reference reference channel for relative correction to avoid the ISI caused by the correction compensation.
如图10示出了本发明实施例信号通道校正补偿装置的结构示意图,装置部署于基带单元BBU中,包括:接收单元41、通道时延确定单元42、补偿系数确定单元43以及校正补偿单元44;FIG. 10 is a schematic structural diagram of a signal channel correction compensation apparatus according to an embodiment of the present invention. The apparatus is deployed in a baseband unit BBU, and includes: a receiving unit 41, a channel delay determining unit 42, a compensation coefficient determining unit 43, and a correction compensating unit 44. ;
其中,接收单元41,用于从射频拉远单元RRU中的校正参考通道中接收各路接收信号,各路接收信号为BBU向RRU中各路发射通道发送发射校正参考信号后,与各路发射通道分别对应输出的信号;各路接收信号的路数为大于1的正整数,且接收信号的路数等于发射通道的路数;
The receiving unit 41 is configured to receive each received signal from the corrected reference channel in the radio remote unit RRU, and each received signal is sent by the BBU to each of the RRUs, and then transmitted with each channel. The channels respectively correspond to the output signals; the number of channels of each received signal is a positive integer greater than 1, and the number of channels of the received signal is equal to the number of channels of the transmitting channel;
通道时延确定单元42,用于根据各路接收信号,确定各路发射通道的通道时延;The channel delay determining unit 42 is configured to determine a channel delay of each channel according to each received signal;
补偿系数确定单元43,用于以最小通道时延所对应的发射通道作为发射参考基准通道,确定各路发射通道的补偿系数;The compensation coefficient determining unit 43 is configured to determine, by using a transmission channel corresponding to the minimum channel delay as a transmission reference channel, a compensation coefficient of each channel;
校正补偿单元44,用于根据各路发射通道的补偿系数,对各路发射通道进行校正补偿。The correction compensation unit 44 is configured to perform correction compensation on each transmission channel according to the compensation coefficient of each transmission channel.
在上述实施例中,通道时延确定单元42,具体用于根据接收的各路接收信号分别计算各路发射通道的频域信道响应;根据各路发射通道的频域信道响应,确定各路发射通道的通道时延。In the above embodiment, the channel delay determining unit 42 is specifically configured to calculate the frequency domain channel response of each channel according to the received signals, and determine the channel according to the frequency domain channel response of each channel. Channel delay of the channel.
在上述实施例中,通道时延确定单元42,具体用于按照公式分别计算各路发射通道的频域信道响应;In the above embodiment, the channel delay determining unit 42 is specifically used according to the formula. Calculating the frequency domain channel response of each transmission channel separately;
其中,stx,i(k)表示BBU向RRU中第i路发射通道上发射的校正参考信号;rrxc,i(k)表示校正参考通道接收到的与第i路发射通道所对应的接收信号;k表示频域子载波编号,k的取值范围从0到N-1,N为频域子载波总数;i的取值范围为0到RRU中发射通道总个数减一;i,k均为大于等于0的整数,N为正整数。Where s tx,i (k) represents a corrected reference signal transmitted by the BBU to the i-th transmit channel in the RRU; r rxc,i (k) represents the receive corresponding to the i-th transmit channel received by the corrected reference channel Signal; k represents the frequency domain subcarrier number, k ranges from 0 to N-1, and N is the total number of frequency domain subcarriers; i ranges from 0 to the total number of transmit channels in the RRU minus one; i, k is an integer greater than or equal to 0, and N is a positive integer.
在上述实施例中,补偿系数确定单元43,具体用于根据各路发射通道的频域信道响应,分别计算各路发射通道的初始校正补偿系数;In the above embodiment, the compensation coefficient determining unit 43 is specifically configured to calculate an initial correction compensation coefficient of each channel according to a frequency domain channel response of each channel;
BBU以最小通道时延所对应的发射通道的初始校正补偿系数为参考基准,确定各路发射通道的补偿系数。The BBU uses the initial correction compensation coefficient of the transmission channel corresponding to the minimum channel delay as a reference reference to determine the compensation coefficient of each transmission channel.
在上述实施例中,补偿系数确定单元43,具体用于将各路发射通道的频域信道响应取倒数,得到各路发射通道的初始校正补偿系数。In the above embodiment, the compensation coefficient determining unit 43 is specifically configured to rectify the frequency domain channel response of each channel to obtain an initial correction compensation coefficient of each channel.
在上述实施例中,补偿系数确定单元43,具体用于将各路发射通道的初始校正补偿系数除以最小通道时延所对应的发射通道的初始校正补偿系数,得到各路发射通道的补偿系数。In the above embodiment, the compensation coefficient determining unit 43 is specifically configured to divide the initial correction compensation coefficient of each channel by the initial correction compensation coefficient of the transmission channel corresponding to the minimum channel delay, and obtain the compensation coefficient of each channel. .
在上述实施例中,BBU连接有多个RRU;In the above embodiment, the BBU is connected to multiple RRUs;
接收单元41,具体用于从各个RRU中的校正参考通道中接收各路接收信号,各路接收信号为BBU向多个RRU中的各路发射通道发送发射校正参考信号后,与多个RRU中各路发射通道分别对应输出的信号。The receiving unit 41 is configured to receive, according to the correction reference channel in each RRU, each received signal, where each received signal is sent by the BBU to each of the plurality of RRUs, and then sent to the RRU. Each channel of the transmission corresponds to the output signal.
图3示出了本发明实施例一天线***的结构示意图,包括天线1、
RRU2以及BBU3;FIG. 3 is a schematic structural diagram of an antenna system according to an embodiment of the present invention, including an antenna 1.
RRU2 and BBU3;
RRU2中包括校正参考通道以及多路发射通道,校正参考通道分别与天线以及BBU3连接;多路发射通道并联于天线与BBU3之间;The RRU2 includes a correction reference channel and a multi-channel transmission channel, and the correction reference channel is respectively connected to the antenna and the BBU3; the multi-channel transmission channel is connected in parallel between the antenna and the BBU3;
BBU3,用于对RRU2中的各路发射通道进行校正补偿,包括:BBU3 is used to correct the compensation for each channel in RRU2, including:
BBU3从RRU2中的校正参考通道中接收各路接收信号,各路接收信号为BBU3向RRU2中各路发射通道发送发射校正参考信号后,与各路发射通道分别对应输出的信号;The BBU3 receives each received signal from the corrected reference channel in the RRU2, and each received signal is a signal corresponding to each of the transmit channels after the BBU3 sends a transmit correction reference signal to each of the RRU2 transmit channels;
BBU3根据各路接收信号,确定各路发射通道的通道时延;The BBU3 determines the channel delay of each channel according to the received signals of each channel;
BBU3以最小通道时延所对应的发射通道作为发射参考基准通道,确定各路发射通道的补偿系数;The BBU3 uses the transmission channel corresponding to the minimum channel delay as the transmission reference channel to determine the compensation coefficient of each channel.
BBU3根据各路发射通道的补偿系数,对各路发射通道进行校正补偿;The BBU3 performs correction compensation for each transmission channel according to the compensation coefficient of each transmission channel;
其中,各路接收信号的路数为大于1的正整数,且接收信号的路数等于发射通道的路数。The number of channels of each received signal is a positive integer greater than 1, and the number of channels of the received signal is equal to the number of channels of the transmitting channel.
在上述实施例中,BBU3,具体用于根据接收的各路接收信号分别计算各路发射通道的频域信道响应;根据各路发射通道的频域信道响应,确定各路发射通道的通道时延。In the above embodiment, the BBU 3 is specifically configured to calculate a frequency domain channel response of each channel according to the received signals, and determine a channel delay of each channel according to a frequency domain channel response of each channel. .
在上述实施例中,BBU3,具体用于按照公式分别计算各路发射通道的频域信道响应;In the above embodiment, BBU3 is specifically used according to the formula. Calculating the frequency domain channel response of each transmission channel separately;
其中,stx,i(k)表示BBU3向RRU2中第i路发射通道上发射的校正参考信号;rrxc,i(k)表示校正参考通道接收到的与第i路发射通道所对应的接收信号;k表示频域子载波编号,k的取值范围从0到N-1,N为频域子载波总数;i的取值范围为0到RRU中发射通道总个数减一;i,k均为大于等于0的整数,N为正整数。Where s tx,i (k) represents a corrected reference signal transmitted by the BBU 3 to the i-th transmit channel in the RRU 2 ; r rxc,i (k) represents the reception corresponding to the i-th transmit channel received by the corrected reference channel Signal; k represents the frequency domain subcarrier number, k ranges from 0 to N-1, and N is the total number of frequency domain subcarriers; i ranges from 0 to the total number of transmit channels in the RRU minus one; i, k is an integer greater than or equal to 0, and N is a positive integer.
在上述实施例中,BBU3,具体用于根据各路发射通道的频域信道响应,分别计算各路发射通道的初始校正补偿系数;还具体用于以最小通道时延所对应的发射通道的初始校正补偿系数为参考基准,确定各路发射通道的补偿系数。In the above embodiment, the BBU 3 is specifically configured to calculate an initial correction compensation coefficient of each channel according to a frequency domain channel response of each channel, and is also specifically used for initializing a channel corresponding to the minimum channel delay. The correction compensation coefficient is used as a reference reference to determine the compensation coefficient of each transmission channel.
在上述实施例中,BBU3,具体用于将各路发射通道的频域信道响应
取倒数,得到各路发射通道的初始校正补偿系数。In the above embodiment, the BBU3 is specifically configured to use the frequency domain channel response of each transmission channel.
Take the reciprocal and get the initial correction compensation coefficient of each channel.
在上述实施例中,BBU3,具体用于将各路发射通道的初始校正补偿系数除以最小通道时延所对应的发射通道的初始校正补偿系数,得到各路发射通道的补偿系数。In the above embodiment, the BBU 3 is specifically configured to divide the initial correction compensation coefficient of each transmission channel by the initial correction compensation coefficient of the transmission channel corresponding to the minimum channel delay to obtain the compensation coefficient of each transmission channel.
在上述实施例中,BBU3连接有多个RRU2;In the above embodiment, the BBU 3 is connected to multiple RRUs 2;
BBU3,具体用于从各个RRU2中的校正参考通道中接收各路接收信号,各路接收信号为BBU3向多个RRU2中的各路发射通道发送发射校正参考信号后,与多个RRU2中各路发射通道分别对应输出的信号。The BBU3 is specifically configured to receive each received signal from the correction reference channel in each RRU2, and each received signal is a BBU3 transmitting a transmission correction reference signal to each of the plurality of RRU2, and each of the multiple RRU2 The transmit channels correspond to the output signals.
图11示出了本发明实施例信号通道校正补偿设备的结构示意图,该设备部署于天线***中,该信号通道校正补偿设备1100包括通信接口1101、存储器1103和处理器1102,其中,通信接口1101、处理器1102、存储器1103、通过总线1104相互连接;总线1104可以是外设部件互连标准(peripheral component interconnect,简称PCI)总线或扩展工业标准结构(extended industry standard architecture,简称EISA)总线等。总线可以分为地址总线、数据总线、控制总线等。为便于表示,图11中仅用一条粗线表示,但并不表示仅有一根总线或一种类型的总线。11 is a schematic structural diagram of a signal channel correction and compensation device according to an embodiment of the present invention. The device is deployed in an antenna system. The signal channel correction compensation device 1100 includes a communication interface 1101, a memory 1103, and a processor 1102. The communication interface 1101 The processor 1102 and the memory 1103 are connected to each other through a bus 1104. The bus 1104 may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 11, but it does not mean that there is only one bus or one type of bus.
通信接口1101用于与发送端通信。存储器1103,用于存放程序。具体地,程序可以包括程序代码,程序代码包括计算机操作指令。存储器1103可能包含随机存取存储器(random access memory,简称RAM),也可能还包括非易失性存储器(non-volatile memory),例如至少一个磁盘存储器。The communication interface 1101 is for communicating with the transmitting end. The memory 1103 is configured to store a program. In particular, the program can include program code, the program code including computer operating instructions. The memory 1103 may include a random access memory (RAM), and may also include a non-volatile memory, such as at least one disk storage.
处理器1102执行存储器1103所存放的程序,实现本发明前述方法实施例的方法:The processor 1102 executes the program stored in the memory 1103 to implement the method of the foregoing method embodiment of the present invention:
包括:include:
从射频拉远单元RRU中的校正参考通道中接收各路接收信号,各路接收信号为设备向RRU中各路发射通道发送发射校正参考信号后,与各路发射通道分别对应输出的信号;Receiving each received signal from the correction reference channel in the radio remote unit RRU, and each received signal is a signal corresponding to each of the transmission channels after transmitting a transmission correction reference signal to each of the RRU transmission channels;
根据各路接收信号,确定各路发射通道的通道时延;Determining the channel delay of each channel according to each received signal;
以最小通道时延所对应的发射通道作为发射参考基准通道,确定各路发射通道的补偿系数;
The transmission channel corresponding to the minimum channel delay is used as the transmission reference channel to determine the compensation coefficient of each channel;
根据各路发射通道的补偿系数,对各路发射通道进行校正补偿;Correction compensation is performed for each transmission channel according to the compensation coefficient of each transmission channel;
其中,各路接收信号的路数为大于1的正整数,且接收信号的路数等于发射通道的路数。The number of channels of each received signal is a positive integer greater than 1, and the number of channels of the received signal is equal to the number of channels of the transmitting channel.
上述的处理器1102可以是通用处理器,包括中央处理器(Central Processing Unit,简称CPU)、网络处理器(Network Processor,简称NP)等;还可以是数字信号处理器(DSP)、专用集成电路(ASIC)、现场可编程门阵列(FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件。The processor 1102 may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP Processor, etc.), or a digital signal processor (DSP), an application specific integrated circuit. (ASIC), Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component.
本发明实施例的信号通道校正补偿方法、装置、***和设备,在获取信号通道的补偿系数时,以最小通道时延所对应的发射通道作为发射参考基准通道,可以有效避免在当前接收片段中包含下一个片段符号样点状况的发生,避免由此带来的ISI。The signal channel correction compensation method, device, system and device according to the embodiment of the invention can obtain the compensation channel of the signal channel, and use the transmission channel corresponding to the minimum channel delay as the transmission reference channel, which can effectively avoid the current receiving segment. Contains the occurrence of the next fragment symbol sample condition, avoiding the resulting ISI.
本领域普通技术人员可以理解:实现上述各方法实施例的全部或部分步骤可以通过程序指令相关的硬件来完成。前述的程序可以存储于一计算机可读取存储介质中。该程序在执行时,执行包括上述各方法实施例的步骤;而前述的存储介质包括:ROM、RAM、磁碟或者光盘等各种可以存储程序代码的介质。One of ordinary skill in the art will appreciate that all or part of the steps to implement the various method embodiments described above may be accomplished by hardware associated with the program instructions. The aforementioned program can be stored in a computer readable storage medium. The program, when executed, performs the steps including the foregoing method embodiments; and the foregoing storage medium includes various media that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.
最后应说明的是:以上各实施例仅用以说明本发明的技术方案,而非对其限制;尽管参照前述各实施例对本发明进行了详细的说明,本领域的普通技术人员应当理解:其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分或者全部技术特征进行等同替换;而这些修改或者替换,并不使相应技术方案的本质脱离本发明各实施例技术方案的范围。
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that The technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or substitutions do not deviate from the technical solutions of the embodiments of the present invention. range.
Claims (21)
- 一种信号通道校正补偿方法,其特征在于,包括:A signal channel correction compensation method, comprising:基带单元BBU从射频拉远单元RRU中的校正参考通道中接收各路接收信号,所述各路接收信号为所述BBU向所述RRU中各路发射通道发送发射校正参考信号后,与所述各路发射通道分别对应输出的信号;The baseband unit BBU receives the received signals from the corrected reference channel in the radio remote unit RRU, and the received signals are sent by the BBU to the transmit channels of the RRUs. Each channel of the transmission corresponds to the output signal;所述BBU根据所述各路接收信号,确定所述各路发射通道的通道时延;Determining, by the BBU, a channel delay of each of the transmitting channels according to the received signals of each path;所述BBU以最小通道时延所对应的发射通道作为发射参考基准通道,确定所述各路发射通道的补偿系数;Determining, by the BBU, a transmission channel corresponding to the minimum channel delay as a transmission reference channel, and determining a compensation coefficient of each of the transmission channels;所述BBU根据所述各路发射通道的补偿系数,对所述各路发射通道进行校正补偿;The BBU performs correction compensation on the transmission channels of the respective channels according to the compensation coefficients of the transmission channels of the respective channels;其中,所述各路接收信号的路数为大于1的正整数,且接收信号的路数等于发射通道的路数。The number of paths of the received signals is a positive integer greater than 1, and the number of paths of the received signals is equal to the number of channels of the transmitting channel.
- 根据权利要求1所述的方法,其特征在于,所述BBU根据所述各路接收信号,确定所述各路发射通道的通道时延,包括:The method according to claim 1, wherein the BBU determines a channel delay of each of the transmission channels according to the received signals of the respective channels, including:所述BBU根据接收的所述各路接收信号分别计算所述各路发射通道的频域信道响应;The BBU calculates a frequency domain channel response of each of the transmission channels according to the received signals received by the BBUs;所述BBU根据所述各路发射通道的频域信道响应,确定所述各路发射通道的通道时延。The BBU determines a channel delay of each of the transmit channels according to a frequency domain channel response of each of the transmit channels.
- 根据权利要求2所述的方法,其特征在于,所述BBU根据接收的所述各路接收信号分别计算所述各路发射通道的频域信道响应,包括:The method according to claim 2, wherein the BBU separately calculates frequency domain channel responses of the respective transmission channels according to the received received signals, including:所述BBU按照公式分别计算所述各路发射通道的频域信道响应;The BBU according to the formula Calculating a frequency domain channel response of each of the transmission channels separately;其中,stx,i(k)表示所述BBU向所述RRU中第i路发射通道上发射的校正参考信号;rrxc,i(k)表示校正参考通道接收到的与第i路发射通道所对应的接收信号;k表示频域子载波编号,k的取值范围从0到N-1,N为频域子载波总数;i的取值范围为0到所述RRU中发射通道总个数减一;i,k均为大于等于0的整数,N为正整数。Where s tx,i (k) represents a corrected reference signal transmitted by the BBU to the i-th transmit channel of the RRU; r rxc,i (k) represents the received i-th transmit channel of the corrected reference channel The corresponding received signal; k represents the frequency domain subcarrier number, k ranges from 0 to N-1, and N is the total number of frequency domain subcarriers; i ranges from 0 to the total number of transmit channels in the RRU The number is reduced by one; i, k are integers greater than or equal to 0, and N is a positive integer.
- 根据权利要求2或3所述的方法,其特征在于,所述BBU以最小 通道时延所对应的发射通道作为发射参考基准通道,确定所述各路发射通道的补偿系数,包括:Method according to claim 2 or 3, characterized in that said BBU is at a minimum The transmission channel corresponding to the channel delay is used as a transmission reference channel, and the compensation coefficients of the channel are determined, including:所述BBU根据所述各路发射通道的频域信道响应,分别计算所述各路发射通道的初始校正补偿系数;The BBU calculates an initial correction compensation coefficient of each of the transmission channels according to a frequency domain channel response of each of the transmission channels;所述BBU以最小通道时延所对应的发射通道的初始校正补偿系数为参考基准,确定所述各路发射通道的补偿系数。The BBU determines a compensation coefficient of each of the transmission channels by using an initial correction compensation coefficient of a transmission channel corresponding to the minimum channel delay as a reference.
- 根据权利要求4所述的方法,其特征在于,所述BBU根据所述各路发射通道的频域信道响应,分别计算所述各路发射通道的初始校正补偿系数,包括:The method according to claim 4, wherein the BBU calculates an initial correction compensation coefficient of each of the transmission channels according to a frequency domain channel response of each of the transmission channels, including:所述BBU将所述各路发射通道的频域信道响应取倒数,得到所述各路发射通道的初始校正补偿系数。The BBU takes the frequency domain channel response of each of the transmission channels into a reciprocal to obtain an initial correction compensation coefficient of each of the transmission channels.
- 根据权利要求4或5所述的方法,其特征在于,所述BBU以最小通道时延所对应的发射通道的初始校正补偿系数为参考基准,确定所述各路发射通道的补偿系数,包括:The method according to claim 4 or 5, wherein the BBU determines the compensation coefficient of each of the transmission channels by using an initial correction compensation coefficient of the transmission channel corresponding to the minimum channel delay as a reference, and includes:所述BBU将所述各路发射通道的初始校正补偿系数除以所述最小通道时延所对应的发射通道的初始校正补偿系数,得到所述各路发射通道的补偿系数。The BBU divides an initial correction compensation coefficient of each of the transmission channels by an initial correction compensation coefficient of the transmission channel corresponding to the minimum channel delay to obtain a compensation coefficient of each of the transmission channels.
- 根据权利要求1~6中任一项所述的方法,其特征在于,所述BBU连接有多个RRU;The method according to any one of claims 1 to 6, wherein the BBU is connected to a plurality of RRUs;所述基带单元BBU从射频拉远单元RRU中的校正参考通道中接收各路接收信号,包括:The baseband unit BBU receives the received signals from the corrected reference channel in the radio remote unit RRU, including:所述BBU从各个所述RRU中的校正参考通道中接收各路接收信号,所述各路接收信号为所述BBU向所述多个RRU中的各路发射通道发送发射校正参考信号后,与所述多个RRU中各路发射通道分别对应输出的信号。The BBU receives each received signal from a corrected reference channel in each of the RRUs, and the received signals are sent by the BBU to the transmit channels of the plurality of RRUs, and then Each of the plurality of RRUs corresponds to an output signal.
- 一种信号通道校正补偿装置,其特征在于,所述装置部署于基带单元BBU中,包括:A signal channel correction compensating device, wherein the device is deployed in a baseband unit BBU, and includes:接收单元,用于从射频拉远单元RRU中的校正参考通道中接收各路接收信号,所述各路接收信号为所述BBU向所述RRU中各路发射通道发送发射校正参考信号后,与所述各路发射通道分别对应输出的信号;所 述各路接收信号的路数为大于1的正整数,且接收信号的路数等于发射通道的路数;a receiving unit, configured to receive, according to a correction reference channel in the radio remote unit RRU, each received signal, where the received signal is sent by the BBU to each of the RRUs to send a transmission correction reference signal, and Each of the transmission channels respectively corresponds to an output signal; The number of paths of each received signal is a positive integer greater than 1, and the number of channels of the received signal is equal to the number of channels of the transmitting channel;通道时延确定单元,用于根据所述各路接收信号,确定所述各路发射通道的通道时延;a channel delay determining unit, configured to determine a channel delay of each of the transmitting channels according to the received signals of the respective paths;补偿系数确定单元,用于以最小通道时延所对应的发射通道作为发射参考基准通道,确定所述各路发射通道的补偿系数;a compensation coefficient determining unit, configured to use a transmitting channel corresponding to the minimum channel delay as a transmitting reference reference channel, and determine a compensation coefficient of each of the transmitting channels;校正补偿单元,用于根据所述各路发射通道的补偿系数,对所述各路发射通道进行校正补偿。And a correction compensation unit, configured to perform correction compensation on the respective transmission channels according to the compensation coefficients of the respective transmission channels.
- 根据权利要求8所述的装置,其特征在于,所述通道时延确定单元,具体用于根据接收的所述各路接收信号分别计算所述各路发射通道的频域信道响应;根据所述各路发射通道的频域信道响应,确定所述各路发射通道的通道时延。The apparatus according to claim 8, wherein the channel delay determining unit is configured to separately calculate a frequency domain channel response of each of the transmitting channels according to the received received signals; The frequency domain channel response of each channel is determined, and the channel delay of each channel is determined.
- 根据权利要求9所述的装置,其特征在于,所述通道时延确定单元,具体用于按照公式分别计算所述各路发射通道的频域信道响应;The apparatus according to claim 9, wherein said channel delay determining unit is specifically configured according to a formula Calculating a frequency domain channel response of each of the transmission channels separately;其中,stx,i(k)表示所述BBU向所述RRU中第i路发射通道上发射的校正参考信号;rrxc,i(k)表示校正参考通道接收到的与第i路发射通道所对应的接收信号;k表示频域子载波编号,k的取值范围从0到N-1,N为频域子载波总数;i的取值范围为0到所述RRU中发射通道总个数减一;i,k均为大于等于0的整数,N为正整数。Where s tx,i (k) represents a corrected reference signal transmitted by the BBU to the i-th transmit channel of the RRU; r rxc,i (k) represents the received i-th transmit channel of the corrected reference channel The corresponding received signal; k represents the frequency domain subcarrier number, k ranges from 0 to N-1, and N is the total number of frequency domain subcarriers; i ranges from 0 to the total number of transmit channels in the RRU The number is reduced by one; i, k are integers greater than or equal to 0, and N is a positive integer.
- 根据权利要求9或10所述的装置,其特征在于,所述补偿系数确定单元,具体用于根据所述各路发射通道的频域信道响应,分别计算所述各路发射通道的初始校正补偿系数;The apparatus according to claim 9 or 10, wherein the compensation coefficient determining unit is specifically configured to calculate initial correction compensation of each of the transmitting channels according to frequency domain channel responses of the respective transmitting channels coefficient;以最小通道时延所对应的发射通道的初始校正补偿系数为参考基准,确定所述各路发射通道的补偿系数。The initial correction compensation coefficient of the transmission channel corresponding to the minimum channel delay is used as a reference reference, and the compensation coefficients of the respective transmission channels are determined.
- 根据权利要求11所述的装置,其特征在于,所述补偿系数确定单元,具体用于将所述各路发射通道的频域信道响应取倒数,得到所述各路发射通道的初始校正补偿系数。The apparatus according to claim 11, wherein the compensation coefficient determining unit is configured to recalculate the frequency domain channel response of each of the transmitting channels to obtain an initial correction compensation coefficient of each of the transmitting channels. .
- 根据权利要求11或12所述的装置,其特征在于,所述补偿系数 确定单元,具体用于将所述各路发射通道的初始校正补偿系数除以所述最小通道时延所对应的发射通道的初始校正补偿系数,得到所述各路发射通道的补偿系数。Device according to claim 11 or 12, characterized in that said compensation coefficient And a determining unit, configured to divide an initial correction compensation coefficient of each of the transmission channels by an initial correction compensation coefficient of the transmission channel corresponding to the minimum channel delay, to obtain a compensation coefficient of each of the transmission channels.
- 根据权利要求8~13中任一项所述的装置,其特征在于,所述BBU连接有多个RRU;The device according to any one of claims 8 to 13, wherein the BBU is connected to a plurality of RRUs;所述接收单元,具体用于从各个所述RRU中的校正参考通道中接收各路接收信号,所述各路接收信号为所述BBU向所述多个RRU中的各路发射通道发送发射校正参考信号后,与所述多个RRU中各路发射通道分别对应输出的信号。The receiving unit is configured to receive, according to a correction reference channel in each of the RRUs, a received signal, where each received signal sends a transmission correction to each of the plurality of RRUs by the BBU. After the reference signal, the output signals corresponding to the respective transmission channels of the plurality of RRUs are respectively corresponding.
- 一种天线***,其特征在于,包括天线、射频拉远单元RRU以及基带单元BBU;An antenna system, comprising: an antenna, a radio remote unit RRU, and a baseband unit BBU;所述RRU中包括校正参考通道以及多路发射通道,所述校正参考通道分别与所述天线以及所述BBU连接;所述多路发射通道并联于所述天线与所述BBU之间;The RRU includes a correction reference channel and a plurality of transmission channels, wherein the correction reference channel is respectively connected to the antenna and the BBU; and the multiple transmission channel is connected in parallel between the antenna and the BBU;所述BBU,用于对所述RRU中的所述各路发射通道进行校正补偿,包括:The BBU is configured to perform correction compensation on the respective transmit channels in the RRU, including:所述BBU从所述RRU中的校正参考通道中接收各路接收信号,所述各路接收信号为所述BBU向所述RRU中各路发射通道发送发射校正参考信号后,与所述各路发射通道分别对应输出的信号;Receiving, by the BBU, the received signals from the corrected reference channel in the RRU, where the received signals are sent by the BBU to the transmit channels of the RRUs, and the respective paths are The transmitting channels respectively correspond to the output signals;所述BBU根据所述各路接收信号,确定所述各路发射通道的通道时延;Determining, by the BBU, a channel delay of each of the transmitting channels according to the received signals of each path;所述BBU以最小通道时延所对应的发射通道作为发射参考基准通道,确定所述各路发射通道的补偿系数;Determining, by the BBU, a transmission channel corresponding to the minimum channel delay as a transmission reference channel, and determining a compensation coefficient of each of the transmission channels;所述BBU根据所述各路发射通道的补偿系数,对所述各路发射通道进行校正补偿;The BBU performs correction compensation on the transmission channels of the respective channels according to the compensation coefficients of the transmission channels of the respective channels;其中,所述各路接收信号的路数为大于1的正整数,且接收信号的路数等于发射通道的路数。The number of paths of the received signals is a positive integer greater than 1, and the number of paths of the received signals is equal to the number of channels of the transmitting channel.
- 根据权利要求15所述的***,其特征在于,所述BBU,具体用于根据接收的所述各路接收信号分别计算所述各路发射通道的频域信道响应;根据所述各路发射通道的频域信道响应,确定所述各路发射通道 的通道时延。The system according to claim 15, wherein the BBU is configured to separately calculate frequency domain channel responses of the respective transmission channels according to the received signals received by the respective channels; Frequency domain channel response, determining each of the transmission channels Channel delay.
- 根据权利要求16所述的***,其特征在于,所述BBU,具体用于按照公式分别计算所述各路发射通道的频域信道响应;The system according to claim 16, wherein said BBU is specifically used according to a formula Calculating a frequency domain channel response of each of the transmission channels separately;其中,stx,i(k)表示所述BBU向所述RRU中第i路发射通道上发射的校正参考信号;rrxc,i(k)表示校正参考通道接收到的与第i路发射通道所对应的接收信号;k表示频域子载波编号,k的取值范围从0到N-1,N为频域子载波总数;i的取值范围为0到所述RRU中发射通道总个数减一;i,k均为大于等于0的整数,N为正整数。Where s tx,i (k) represents a corrected reference signal transmitted by the BBU to the i-th transmit channel of the RRU; r rxc,i (k) represents the received i-th transmit channel of the corrected reference channel The corresponding received signal; k represents the frequency domain subcarrier number, k ranges from 0 to N-1, and N is the total number of frequency domain subcarriers; i ranges from 0 to the total number of transmit channels in the RRU The number is reduced by one; i, k are integers greater than or equal to 0, and N is a positive integer.
- 根据权利要求16或17所述的***,其特征在于,所述BBU,具体用于根据所述各路发射通道的频域信道响应,分别计算所述各路发射通道的初始校正补偿系数;还具体用于以最小通道时延所对应的发射通道的初始校正补偿系数为参考基准,确定所述各路发射通道的补偿系数。The system according to claim 16 or 17, wherein the BBU is specifically configured to calculate an initial correction compensation coefficient of each of the transmission channels according to a frequency domain channel response of each of the transmission channels; Specifically, the initial correction compensation coefficient of the transmission channel corresponding to the minimum channel delay is used as a reference reference, and the compensation coefficient of each of the transmission channels is determined.
- 根据权利要求18所述的***,其特征在于,所述BBU,具体用于将所述各路发射通道的频域信道响应取倒数,得到所述各路发射通道的初始校正补偿系数。The system according to claim 18, wherein the BBU is specifically configured to rectify a frequency domain channel response of each of the transmission channels to obtain an initial correction compensation coefficient of each of the transmission channels.
- 根据权利要求18或19所述的***,其特征在于,所述BBU,具体用于将所述各路发射通道的初始校正补偿系数除以所述最小通道时延所对应的发射通道的初始校正补偿系数,得到所述各路发射通道的补偿系数。The system according to claim 18 or 19, wherein the BBU is specifically configured to divide an initial correction compensation coefficient of each of the transmission channels by an initial correction of a transmission channel corresponding to the minimum channel delay The compensation coefficient obtains the compensation coefficient of each of the transmission channels.
- 根据权利要求15~20中任一项所述的***,其特征在于,所述BBU连接有多个RRU;The system according to any one of claims 15 to 20, wherein the BBU is connected to a plurality of RRUs;所述BBU,具体用于从各个所述RRU中的校正参考通道中接收各路接收信号,所述各路接收信号为所述BBU向所述多个RRU中的各路发射通道发送发射校正参考信号后,与所述多个RRU中各路发射通道分别对应输出的信号。 The BBU is specifically configured to receive, according to a correction reference channel in each of the RRUs, a received signal, where each received signal sends a transmission correction reference to each of the plurality of RRUs by the BBU. After the signal, corresponding to each of the plurality of RRUs, the output signals respectively correspond to the output signals.
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