CN111740752B - Method and device for processing digital intermediate frequency signal - Google Patents
Method and device for processing digital intermediate frequency signal Download PDFInfo
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- CN111740752B CN111740752B CN201910229452.XA CN201910229452A CN111740752B CN 111740752 B CN111740752 B CN 111740752B CN 201910229452 A CN201910229452 A CN 201910229452A CN 111740752 B CN111740752 B CN 111740752B
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Abstract
The invention relates to the communication field, in particular to a method and a device for processing digital intermediate frequency signals, which are used for reducing the hardware implementation cost of a processing device, and the method comprises the following steps: the functions of merging and distributing digital intermediate-frequency signals are realized through the digital PHUB, namely a downlink processing process of generating the digital intermediate-frequency signals by the baseband signals and an uplink processing process of generating the baseband signals by the digital intermediate-frequency signals are all arranged on the PHUB, so that the FPGA in each pRRU is not required to be upgraded according to the corresponding system, frequency band and bandwidth, and thus, the smooth software upgrade of the station-built equipment is completed under the condition that the pRRU is not required to be replaced, the hardware realization cost is effectively reduced, meanwhile, the flexible butt joint of the PHUB and the pPPUs of different systems, different frequency bands and different bandwidths can be realized, and the system flexibility is improved.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a method and an apparatus for processing a digital intermediate frequency signal.
Background
In the prior art, referring to fig. 1, a distributed Pico base station (Pico base station) generally includes three device parts, namely, a Baseband processing Unit (BBU), a micro multiport repeater (Pico hub, phib), and a micro Radio Remote Unit (pRRU).
As shown in fig. 1, one or more PHUBs may be connected below one BBU, and one or more prrus may be connected below one PHUB; the PHUB has a baseband data merging and distributing function, data flow between the PHUB and the pRRU is baseband data, and the pRRU realizes uplink and downlink intermediate frequency signal processing and radio frequency amplification functions.
However, with the development of 4G technology and 5G technology, the requirement for multi-mode signal processing is greatly increased, so that down-conversion and filtering (DDC), up-conversion and filtering (DUC) processing resources are continuously increased; on the other hand, with the increase of the bandwidth of the 5G base station (NR) signal, the nonlinearity of the power amplifier is severely deteriorated, and Digital Pre-Distortion (DPD) algorithm processing needs to be added to meet the index requirement.
Therefore, the complexity of the intermediate frequency signal processing of the pRRU is close to 2 times that of the original 4G-only system, and these all put higher demands on the processing capability of a Field-Programmable Gate Array (FPGA) in the pRRU, thereby further increasing the volume and heat consumption of the pRRU.
It can be seen that, in the prior art, the ppru supporting the 4G technology and the pRRU supporting the 5G technology need to be newly designed, the newly designed pRRU needs to be increased in size, weight and power consumption, and needs to be replaced in a place where the pRRU is already built, which is not suitable for smooth upgrade of existing equipment.
Disclosure of Invention
The embodiment of the invention provides a method and a device for processing a digital intermediate frequency signal, which are used for reducing the hardware implementation cost of a processing device and increasing the implementation flexibility.
The embodiment of the invention provides the following specific technical scheme:
a method of processing a digital intermediate frequency signal, comprising:
the method comprises the following steps that a micro multiport transponder PHUB receives a baseband signal sent by a baseband processing unit BBU and carries out filtering processing on the baseband signal;
the PHUB performs up-conversion and filtering DUC processing on the baseband signal subjected to filtering processing, and performs first frequency-shifting NCO processing on the baseband signal subjected to the DUC processing;
the PHUB combines the baseband signals processed by the first NCO to generate corresponding digital intermediate frequency signals;
and the PHUB compresses the digital intermediate frequency signals and respectively sends the compressed digital intermediate frequency signals to each remote radio unit pRRU.
Optionally, after receiving the baseband signal, before performing filtering processing on the baseband signal, the method further includes:
and converting the baseband signal from a frequency domain to a time domain.
Optionally, the performing, by the PHUB, a DUC process on the filtered baseband signal, including:
and increasing the rate of the baseband signal from the baseband rate to the intermediate frequency rate.
Optionally, the PHUB performs a first NCO processing on the base band signal processed by the DUC, including:
and respectively setting corresponding carrier central frequency points aiming at each baseband signal according to a preset carrier central frequency point set.
A method of processing a digital intermediate frequency signal, comprising:
the method comprises the following steps that a micro multiport transponder PHUB receives a digital intermediate frequency signal sent by a micro radio remote unit pRRU and decompresses the digital intermediate frequency signal;
the PHUB carries out second frequency-carrying NCO processing on the decompressed digital intermediate-frequency signal;
the PHUB performs down-conversion and filtering DDC processing on the digital intermediate frequency signal processed by the second NCO to obtain a corresponding baseband signal;
and the PHUB is used for filtering the baseband signal processed by the DDC and then sending the baseband signal to the baseband processing unit BBU.
Optionally, the second NCO processing is performed on the decompressed digital intermediate frequency signal by the PHUB, where the second NCO processing includes:
and adjusting the central frequency point of the carrier used by each path of digital intermediate frequency signal to zero frequency.
Optionally, when performing DDC processing on the digital intermediate frequency signal processed by the second NCO, the processor is configured to:
and reducing the rate of each path of digital intermediate frequency signal from the intermediate frequency rate to the baseband rate.
Optionally, after filtering the baseband signal processed by the DDC, before sending the baseband signal to the BBU, the method further includes:
and converting the baseband signal from a time domain to a frequency domain.
An apparatus for processing a digital intermediate frequency signal, comprising a processor and a memory, wherein the processor, for reading a program in the memory, performs the following processes:
receiving a baseband signal sent by a baseband processing unit (BBU), and filtering the baseband signal;
carrying out up-conversion and filtering DUC processing on the baseband signal subjected to filtering processing, and carrying out first frequency shifting NCO processing on the baseband signal subjected to the DUC processing;
combining the baseband signals processed by the first NCO to generate corresponding digital intermediate frequency signals;
and compressing the digital intermediate frequency signals, and respectively sending the compressed digital intermediate frequency signals to each remote radio unit pRRU.
Optionally, after receiving the baseband signal and before performing filtering processing on the baseband signal, the processor is further configured to:
and converting the baseband signal from a frequency domain to a time domain.
Optionally, when DUC processing is performed on the filtered baseband signal, the processor is configured to:
and increasing the rate of the baseband signal from the baseband rate to the intermediate frequency rate.
Optionally, when the first NCO processing is performed on the baseband signal processed by the DUC, the processor is configured to:
and respectively setting corresponding carrier central frequency points aiming at each baseband signal according to a preset carrier central frequency point set.
An apparatus for processing a digital intermediate frequency signal, comprising a processor and a memory, wherein the processor, for reading a program in the memory, performs the following processes:
receiving a digital intermediate frequency signal sent by a remote radio unit pRRU, and decompressing the digital intermediate frequency signal;
carrying out second frequency-shifting NCO processing on the decompressed digital intermediate-frequency signal;
NCO processing is carried out on the digital intermediate frequency signal after the shunting, and down-conversion and filtering DDC processing are carried out on the digital intermediate frequency signal processed by the NCO to obtain a corresponding baseband signal;
and filtering the baseband signal processed by the DDC, and sending the baseband signal to a baseband processing unit BBU.
Optionally, when performing the second NCO processing on the decompressed digital intermediate frequency signal, the processor is configured to:
and adjusting the central frequency point of the carrier used by each path of digital intermediate frequency signal to zero frequency.
Optionally, when performing DDC processing on the digital intermediate frequency signal processed by the second NCO, the processor is configured to:
and reducing the rate of each path of digital intermediate frequency signal from the intermediate frequency rate to the baseband rate.
Optionally, after filtering the DDC-processed baseband signal, before sending the DDC-processed baseband signal to the BBU, the processor is further configured to:
and converting the baseband signal from a time domain to a frequency domain.
A pico-base station comprises a baseband processing unit BBU, a micro multi-port repeater PHUB and a micro remote radio unit pRRU, wherein,
the PHUB is the device of any one of the above.
Optionally, the pRRU is further for:
after receiving the compressed digital intermediate frequency signal, decompressing;
then, selecting a corresponding filter to filter the decompressed digital intermediate frequency signal by adopting a set system, a set frequency band and a set bandwidth;
carrying out data peak clipping CFR processing and digital pre-distortion DPD processing on the filtered digital intermediate frequency signal;
and D/A conversion and modulation are carried out on the digital intermediate frequency signal after DPD processing, and then transmission is carried out.
A pico-base station comprises a baseband processing unit BBU, a micro multi-port repeater PHUB and a micro remote radio unit pRRU, wherein,
the PHUB is the device of any one of claims 13-16.
Optionally, the pRRU is further for:
receiving an air interface signal through an antenna and transmitting the air interface signal into a low-noise amplifier for low-noise amplification;
demodulating and performing analog-to-digital conversion on the air interface signal subjected to low-noise amplification to form a corresponding digital intermediate frequency signal;
and after the digital intermediate frequency signal is digitally compressed, transmitting the digital intermediate frequency signal to PHUB.
In the embodiment of the invention, the functions of merging and distributing the digital intermediate frequency signals are realized through the digital PHUB, namely a downlink processing process for generating the digital intermediate frequency signals by the baseband signals and an uplink processing process for generating the baseband signals by the digital intermediate frequency signals are all completed in the PHUB, so that the FPGA in each pRRU is not required to be upgraded according to the corresponding system, frequency band and bandwidth, and the smooth software upgrade of the established station equipment is completed under the condition of not replacing the pRRU, thereby effectively reducing the hardware realization cost, and simultaneously realizing the flexible butt joint of the PHUB and the pPPUs with different systems, different frequency bands and different bandwidths, thereby improving the flexibility of the system.
Drawings
FIG. 1 is a diagram illustrating a distributed pico-cell system architecture in the prior art;
FIG. 2 is a schematic diagram of a digital distribution system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a first process of PHUB processing a digital intermediate frequency signal according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating a second process of PHUB processing a digital IF signal according to an embodiment of the present invention;
FIG. 5 is a diagram illustrating a PHUB functional architecture according to an embodiment of the present invention;
fig. 6 is a functional architecture diagram of a pico-base station in an embodiment of the invention.
Detailed Description
In order to realize the merging and distribution functions of digital intermediate frequency signals, the embodiment of the invention develops a digital distribution system, and the digital PHUB in the system can be connected with the existing pRRU to realize the smooth upgrade of a pico-cell distributed system and form the pico-cell system supporting multi-system, multi-band and multi-bandwidth transmission and reception.
Preferred embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
Referring to fig. 2, in the embodiment of the present invention, the processing process of the digital intermediate frequency signal is shifted to the PHUB, and since the digital intermediate frequency signal does not distinguish the system, the frequency band, and the bandwidth, the PHUB can perform unified processing on the baseband signals of the 4G system or the 8G system sent by the BBU, generate the digital intermediate frequency signal and then distribute the digital intermediate frequency signal to each pRRU for modulation, or, after receiving the digital intermediate frequency signal demodulated by each pRRU, process the digital intermediate frequency signal to generate a corresponding baseband signal and send the baseband signal to the BBU for subsequent processing.
Specifically, the processing procedure of the digital intermediate frequency signal is divided into downlink processing and uplink processing, and the interface between each pRRU and PHUB is an interface for transmitting the digital intermediate frequency signal. In the downlink processing process, the digital intermediate frequency signal is compressed on the PHUB side, and is decompressed on the pRRU; in the uplink processing, the digital intermediate frequency signal is compressed in the pRRU and decompressed in the PHUB, which are described below.
Referring to fig. 3, in the embodiment of the present invention, in the downlink, the detailed process of processing the digital if signal by the phr is as follows:
step 300: in a downlink, the PHUB receives a baseband signal sent by the BBU and performs filtering processing on the baseband signal.
Specifically, the phib needs to filter the baseband signal by using a low-pass filter (pfir) with a corresponding system, frequency band and bandwidth according to the system, frequency band and bandwidth of the baseband signal.
Optionally, the frequency domain to time domain conversion function at the BBU side may also be integrated into the PHUB, and the time domain baseband signal interface between the BBU and the PHUB is changed into the frequency domain baseband signal interface, which may greatly reduce the amount of data transmitted.
Therefore, in this case, after receiving the baseband signal, the PHUB needs to perform Fast Fourier Transform (FFT) on the baseband signal before performing filtering processing on the baseband signal.
Step 310: the PHUB performs up-conversion and filtering (DUC) processing on the filtered baseband signal.
The DUC processing is performed on the baseband signal in order to increase the rate of the baseband signal from the baseband rate to the intermediate frequency rate.
Step 320: the PHUB performs a first frequency transposition (NCO) process on the base band signal processed by the DUC.
Specifically, the PHUB sets corresponding carrier center frequency points for each baseband signal according to a preset carrier center frequency point set, that is, sets transmission frequency points for each baseband signal, and moves the baseband signal from zero frequency to the corresponding transmission frequency points.
Step 330: the PHUB combines the baseband signals processed by the first NCO to form a multi-carrier digital intermediate frequency signal (also called a multi-carrier signal).
Step 340: the PHUB compresses the multi-carrier digital intermediate frequency signals and then respectively sends the multi-carrier digital intermediate frequency signals to each pRRU.
Because different systems, frequency bands and bandwidths can be adopted by different pRRUs, after receiving the multi-carrier digital intermediate frequency signal distributed by the PHUB, each pRRU can transmit the multi-carrier digital intermediate frequency signal according to the system, the frequency band and the bandwidth of the pRRU.
Specifically, the pRRU decompresses the compressed digital intermediate frequency signal after receiving the compressed digital intermediate frequency signal, and because the signal-to-noise ratio of the compressed digital intermediate frequency signal is lost, the pRRU selects an appropriate filter for filtering (the filter system is stored in the FPGA in advance according to the system capacity requirement) according to the system, frequency band and bandwidth adopted by the pRRU to ensure the signal quality. The filter in the pRRU is a low-pass filter which is designed in advance according to the requirement of system bandwidth and supports various bandwidths, is pre-stored in the RAM of the FPGA or the DDR, and can be directly called when in use.
In order to improve the efficiency of the pRRU, the pRRU needs to perform data peak Clipping (CFR) processing on the filtered digital intermediate frequency signal to reduce the signal peak-to-average ratio, and finally, the pRRU performs digital pre-distortion (DPD) processing on the digital intermediate frequency signal processed by the CFR, inputs the digital intermediate frequency signal processed by the DPD into a transceiver module chip (TRX), performs digital-to-analog conversion and modulation, and transmits the digital intermediate frequency signal to an antenna through a power amplifier.
Based on the above process, in the uplink, the pRRU needs to receive an air interface signal through the antenna, transmit the air interface signal to the low noise amplifier, perform low noise amplification, and then enter the transceiver module chip (TRX) for demodulation and analog-to-digital conversion to form a corresponding digital intermediate frequency signal, and then, the pRRU digitally compresses the digital intermediate frequency signal and transmits the digital intermediate frequency signal to the PHUB.
Referring to fig. 4, in the embodiment of the present invention, in the uplink, the detailed process of processing the digital if signal by the phib is as follows:
step 400: on the uplink, the PHUB receives the digital intermediate frequency signal transmitted by the pRRU and decompresses the digital intermediate frequency signal.
Step 410: PHUB performs a second NCO process on the decompressed digital intermediate frequency signal.
Specifically, the digital if signal is a multi-carrier signal, that is, the digital if signal includes multiple paths of signals, and each path uses a different carrier center frequency point for transceiving, then, in step 410, the PHUB adjusts the carrier center frequency point used by each path of digital if signal to zero frequency.
Step 420: the PHUB performs down-conversion and filtering (DDC) processing on the digital intermediate frequency signal processed by the NCO to obtain a corresponding baseband signal.
DDC processing is carried out on each path of digital intermediate frequency signal, so that the rate of the digital intermediate frequency signal is reduced to the baseband speed from the intermediate frequency rate, and thus each path of baseband signal can be obtained.
Step 430: the PHUB performs filtering processing on the baseband signal processed by the DDC and then sends the baseband signal to the BBU.
Specifically, a low-pass filter (pfir) may be used to perform low-pass filtering processing, and then transmit the data to the BBU.
Based on the foregoing embodiments, referring to fig. 5, in one embodiment of the present invention, a PHUB is provided, at least a processor 50 and a memory 51, where the processor 50 is configured to read a program in the memory and execute the following processes:
receiving a baseband signal sent by a baseband processing unit (BBU), and filtering the baseband signal;
carrying out up-conversion and filtering DUC processing on the baseband signal subjected to filtering processing, and carrying out first frequency shifting NCO processing on the baseband signal subjected to the DUC processing;
combining the baseband signals processed by the first NCO to generate corresponding digital intermediate frequency signals;
and compressing the digital intermediate frequency signals, and respectively sending the compressed digital intermediate frequency signals to each remote radio unit pRRU.
Optionally, after receiving the baseband signal and before performing filtering processing on the baseband signal, the processor 50 is further configured to:
and converting the baseband signal from a frequency domain to a time domain.
Optionally, when DUC processing is performed on the filtered baseband signal, the processor 50 is configured to:
and increasing the rate of the baseband signal from the baseband rate to the intermediate frequency rate.
Optionally, when performing the first NCO processing on the base band signal processed by the DUC, the processing 50 is configured to:
and respectively setting corresponding carrier central frequency points aiming at each baseband signal according to a preset carrier central frequency point set.
Based on the foregoing embodiments, referring to fig. 5, in one embodiment of the present invention, a PHUB is provided, at least a processor 50 and a memory 51, where the processor 50 is configured to read a program in the memory and execute the following processes:
receiving a digital intermediate frequency signal sent by a remote radio unit pRRU, and decompressing the digital intermediate frequency signal;
carrying out second frequency-shifting NCO processing on the decompressed digital intermediate-frequency signal;
NCO processing is carried out on the digital intermediate frequency signal after the shunting, and down-conversion and filtering DDC processing are carried out on the digital intermediate frequency signal processed by the NCO to obtain a corresponding baseband signal;
and filtering the baseband signal processed by the DDC, and sending the baseband signal to a baseband processing unit BBU.
Optionally, when performing the second NCO processing on the decompressed digital intermediate frequency signal, the processor 50 is configured to:
and adjusting the central frequency point of the carrier used by each path of digital intermediate frequency signal to zero frequency.
Optionally, when performing DDC processing on the digital intermediate frequency signal processed by the second NCO, the processor 50 is configured to:
and reducing the rate of each path of digital intermediate frequency signal from the intermediate frequency rate to the baseband rate.
Optionally, after filtering the DDC processed baseband signal, before sending the DDC processed baseband signal to the BBU, the processor 50 is further configured to:
and converting the baseband signal from a time domain to a frequency domain.
Based on the same inventive concept, referring to fig. 6, in an embodiment of the present invention, a pico-base station is provided, which at least includes a BBU, a PHUB, and a pRRU, wherein,
the PHUB is used for executing any one of the methods in the steps 300-340.
Optionally, the pRRU is further for:
after receiving the compressed digital intermediate frequency signal, decompressing;
then, selecting a corresponding filter to filter the decompressed digital intermediate frequency signal by adopting a set system, a set frequency band and a set bandwidth;
carrying out data peak clipping CFR processing and digital pre-distortion DPD processing on the filtered digital intermediate frequency signal;
and D/A conversion and modulation are carried out on the digital intermediate frequency signal after DPD processing, and then transmission is carried out.
Based on the same inventive concept, referring to fig. 6, in an embodiment of the present invention, a pico-base station is provided, which at least includes a BBU, a PHUB, and a pRRU, wherein,
the PHUB is used for executing any one of the above steps 400-440.
Optionally, the pRRU is further for:
receiving an air interface signal through an antenna and transmitting the air interface signal into a low-noise amplifier for low-noise amplification;
demodulating and performing analog-to-digital conversion on the air interface signal subjected to low-noise amplification to form a corresponding digital intermediate frequency signal;
and after the digital intermediate frequency signal is digitally compressed, transmitting the digital intermediate frequency signal to PHUB.
In summary, in the embodiments of the present invention, the digital intermediate frequency signal combining and distributing function is implemented by using the digital PHUB, that is, the downlink processing procedure for generating the digital intermediate frequency signal from the baseband signal and the uplink processing procedure for generating the baseband signal from the digital intermediate frequency signal are both completed in the PHUB, so that the FPGA device in each pRRU does not need to be updated according to the corresponding system, frequency band and bandwidth, and thus, the smooth software upgrade of the established station device is completed without requiring the replacement of the pRRU, thereby effectively reducing the hardware implementation cost, and simultaneously, the flexible docking of the PHUB with pPPU of different systems, different frequency bands and different bandwidths is also achieved, thereby improving the system flexibility.
Specifically, the PHUB can realize merging and distribution processing of multi-carrier digital intermediate frequency signals of different systems (such as GSM, CDMA, WCDMA, TD-LTE and FDD LTE) and different bandwidths, a multi-mode and multi-frequency distributed system can be met only by replacing pRRUs of corresponding systems, frequency bands and bandwidths, and the network construction is more flexible.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to encompass such modifications and variations.
Claims (20)
1. A method of processing a digital intermediate frequency signal, comprising:
the method comprises the following steps that a micro multiport transponder PHUB receives a baseband signal sent by a baseband processing unit BBU and carries out filtering processing on the baseband signal;
the PHUB performs up-conversion and filtering DUC processing on the baseband signal subjected to filtering processing, and performs first frequency-shifting NCO processing on the baseband signal subjected to the DUC processing;
the PHUB combines the baseband signals processed by the first NCO to generate corresponding digital intermediate frequency signals;
and the PHUB compresses the digital intermediate frequency signals and respectively sends the compressed digital intermediate frequency signals to each remote radio unit pRRU.
2. The method of claim 1, wherein the PHUB, after receiving the baseband signal and before performing the filtering process on the baseband signal, further comprises:
and converting the baseband signal from a frequency domain to a time domain.
3. The method of claim 1 or 2, wherein the PHUB performs DUC processing on the filtered baseband signal, comprising:
and increasing the rate of the baseband signal from the baseband rate to the intermediate frequency rate.
4. The method of claim 1 or 2, wherein the PHUB performs a first NCO processing on the DUC-processed baseband signal, comprising:
and respectively setting corresponding carrier central frequency points aiming at each baseband signal according to a preset carrier central frequency point set.
5. A method of processing a digital intermediate frequency signal, comprising:
the method comprises the following steps that a micro multiport transponder PHUB receives a digital intermediate frequency signal sent by a micro radio remote unit pRRU and decompresses the digital intermediate frequency signal;
the PHUB carries out second frequency-carrying NCO processing on the decompressed digital intermediate-frequency signal;
the PHUB performs down-conversion and filtering DDC processing on the digital intermediate frequency signal processed by the second NCO to obtain a corresponding baseband signal;
and the PHUB is used for filtering the baseband signal processed by the DDC and then sending the baseband signal to the baseband processing unit BBU.
6. The method of claim 5, wherein the PHUB performs a second NCO process on the decompressed digital intermediate frequency signal, comprising:
and adjusting the central frequency point of the carrier used by each path of digital intermediate frequency signal to zero frequency.
7. The method of claim 5, wherein DDC processing the second NCO-processed digital intermediate frequency signal comprises:
and reducing the rate of each path of digital intermediate frequency signal from the intermediate frequency rate to the baseband rate.
8. The method of any of claims 5-7, wherein filtering the DDC processed baseband signal before sending it to the BBU further comprises:
and converting the baseband signal from a time domain to a frequency domain.
9. An apparatus for processing a digital intermediate frequency signal, comprising a processor and a memory, wherein the processor, for reading a program in the memory, executes the following processes:
receiving a baseband signal sent by a baseband processing unit (BBU), and filtering the baseband signal;
carrying out up-conversion and filtering DUC processing on the baseband signal subjected to filtering processing, and carrying out first frequency shifting NCO processing on the baseband signal subjected to the DUC processing;
combining the baseband signals processed by the first NCO to generate corresponding digital intermediate frequency signals;
and compressing the digital intermediate frequency signals, and respectively sending the compressed digital intermediate frequency signals to each remote radio unit pRRU.
10. The apparatus of claim 9, wherein after receiving a baseband signal, and before filtering the baseband signal, the processor is further configured to:
and converting the baseband signal from a frequency domain to a time domain.
11. The apparatus of claim 9 or 10, wherein, in DUC processing the filtered baseband signal, the processor is configured to:
and increasing the rate of the baseband signal from the baseband rate to the intermediate frequency rate.
12. Apparatus according to claim 9 or 10, wherein, in performing the first NCO processing on the DUC-processed baseband signal, the processor is operable to:
and respectively setting corresponding carrier central frequency points aiming at each baseband signal according to a preset carrier central frequency point set.
13. An apparatus for processing a digital intermediate frequency signal, comprising a processor and a memory, wherein the processor, for reading a program in the memory, executes the following processes:
receiving a digital intermediate frequency signal sent by a remote radio unit pRRU, and decompressing the digital intermediate frequency signal;
carrying out second frequency-shifting NCO processing on the decompressed digital intermediate-frequency signal;
NCO processing is carried out on the digital intermediate frequency signal after the shunting, and down-conversion and filtering DDC processing are carried out on the digital intermediate frequency signal processed by the NCO to obtain a corresponding baseband signal;
and filtering the baseband signal processed by the DDC, and sending the baseband signal to a baseband processing unit BBU.
14. The apparatus as set forth in claim 13, wherein, in performing the second NCO processing on the decompressed digital intermediate frequency signal, said processor is operative to:
and adjusting the central frequency point of the carrier used by each path of digital intermediate frequency signal to zero frequency.
15. The apparatus of claim 13, wherein the processor, when DDC processing the digital intermediate frequency signal processed by the second NCO, is to:
and reducing the rate of each path of digital intermediate frequency signal from the intermediate frequency rate to the baseband rate.
16. The apparatus of any of claims 13-15, wherein after filtering DDC processed baseband signals, the processor is further configured to, before sending to the BBU:
and converting the baseband signal from a time domain to a frequency domain.
17. A pico-base station comprising a baseband processing unit, BBU, a micro multiport repeater, PHUB, and a micro remote radio unit, pRRU, wherein,
the PHUB is the device of any one of claims 9-12.
18. The pico base station of claim 17, wherein the pRRU is further configured to:
after receiving the compressed digital intermediate frequency signal, decompressing;
then, selecting a corresponding filter to filter the decompressed digital intermediate frequency signal by adopting a set system, a set frequency band and a set bandwidth;
carrying out data peak clipping CFR processing and digital pre-distortion DPD processing on the filtered digital intermediate frequency signal;
and D/A conversion and modulation are carried out on the digital intermediate frequency signal after DPD processing, and then transmission is carried out.
19. A pico-base station comprising a baseband processing unit, BBU, a micro multiport repeater, PHUB, and a micro remote radio unit, pRRU, wherein,
the PHUB is for performing the apparatus of any of claims 13-16.
20. The pico base station of claim 19, wherein the pRRU is further configured to:
receiving an air interface signal through an antenna and transmitting the air interface signal into a low-noise amplifier for low-noise amplification;
demodulating and performing analog-to-digital conversion on the air interface signal subjected to low-noise amplification to form a corresponding digital intermediate frequency signal;
and after the digital intermediate frequency signal is digitally compressed, transmitting the digital intermediate frequency signal to PHUB.
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| CN201910229452.XA CN111740752B (en) | 2019-03-25 | 2019-03-25 | Method and device for processing digital intermediate frequency signal |
| PCT/CN2020/072536 WO2020192257A1 (en) | 2019-03-25 | 2020-01-16 | Intermediate-frequency digital signal processing method and device |
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