WO2013097247A1 - 一种利用载波调制的传输方法、装置和*** - Google Patents
一种利用载波调制的传输方法、装置和*** Download PDFInfo
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- WO2013097247A1 WO2013097247A1 PCT/CN2011/085202 CN2011085202W WO2013097247A1 WO 2013097247 A1 WO2013097247 A1 WO 2013097247A1 CN 2011085202 W CN2011085202 W CN 2011085202W WO 2013097247 A1 WO2013097247 A1 WO 2013097247A1
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- signal
- frequency division
- orthogonal frequency
- division multiplexing
- echo
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
- H04B3/23—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other using a replica of transmitted signal in the time domain, e.g. echo cancellers
- H04B3/237—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other using a replica of transmitted signal in the time domain, e.g. echo cancellers using two adaptive filters, e.g. for near end and for end echo cancelling
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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
- H04L25/0202—Channel estimation
- H04L25/0204—Channel estimation of multiple channels
Definitions
- the present invention relates to the field of communications, and in particular, to a transmission method, apparatus and system using carrier modulation.
- OFDM Orthogonal Frequency Division Multiplexing
- MCM Multi-Carrier Modulation
- OFDM Orthogonal Frequency Division Multiplexing
- 4G 4th generation mobile communication systems
- OSD Overlapped Spectrum Duplex
- the OSD technology uses spectrum overlap technology to transmit and receive signals in both uplink and downlink.
- the OSD technology enables all uplink and downlink signals to be fully multiplexed at the same time.
- the spectrum efficiency is relatively traditional.
- Duplexing, Frequency Division Duplex, or TDD (Time Division Duplexing) is expected to increase by a factor of two.
- TDD Time Division Duplexing
- the delay of the channel becomes smaller and smaller, so that the signal transmitted by the near-end device and the remote device and the received signal are almost completely orthogonal in time, so the transmitted signal is returned through the hybrid conversion coil (hybrid).
- the echo (Echo) signal of the receiver to the local end and the received signal sent by the remote device almost completely overlap, causing serious interference to the received signal, and spectrum duplex transmission under the orthogonal frequency division multiplexing technology cannot be realized.
- Embodiments of the present invention provide a transmission method, apparatus, and system using carrier modulation, which can implement spectrum duplex transmission on signals transmitted using orthogonal frequency division multiplexing (OFDM) technology. Improve spectrum utilization.
- OFDM orthogonal frequency division multiplexing
- a transmission method using carrier modulation comprising:
- the near end is on the orthogonal frequency division multiplexing subcarrier channel, and simultaneously performs transmission of the near-end orthogonal frequency division multiplexing signal and reception of the far-end orthogonal frequency division multiplexing signal;
- the received signal is a superposed signal of a near-end echo signal and a far-end orthogonal frequency division multiplexed signal
- the received signal is a near-end echo signal and a far-end orthogonal frequency division Superposed signal of multiplexed signal
- a transmission device using carrier modulation comprising:
- a sending unit configured to perform transmission of a near-end orthogonal frequency division multiplexing signal on at least one orthogonal frequency division multiplexing subcarrier channel;
- a receiving unit configured to perform receiving of the far-end orthogonal frequency division multiplexing signal on the at least one orthogonal frequency division multiplexing subcarrier channel;
- An acquiring unit configured to receive a signal according to a near-end echo orthogonal frequency division multiplexing signal generated by the transmitted near-end orthogonal frequency division multiplexing signal, and the received far-end orthogonal frequency division multiplexing signal a parameter, the received signal is a superposed signal of a near-end echo signal and a far-end orthogonal frequency division multiplexed signal;
- An echo cancellation signal generating unit configured to generate echo cancellation according to the system parameters of the near-end echo orthogonal frequency division multiplexing signal and the far-end orthogonal frequency division multiplexing signal, and the near-end to-be-transmitted signal a signal, where the near-end to-be-transmitted signal is a signal before orthogonal frequency division multiplexing modulation of the near-end orthogonal frequency division multiplexing signal;
- a canceling unit configured to superimpose the echo cancellation signal and the received signal to cancel the near-end echo orthogonal frequency division multiplexing signal superimposed in the received signal, where the received signal is a near-end echo signal Superimposed signal with far-end orthogonal frequency division multiplexed signal
- a transmission system using carrier modulation comprising: a near-end device and a remote device, wherein
- the near-end device includes: a transmitting unit, a receiving unit, an echo canceling signal generating unit, and a canceling unit, where
- a sending unit configured to perform transmission of a near-end orthogonal frequency division multiplexing signal on at least one orthogonal frequency division multiplexing subcarrier channel;
- a receiving unit configured to perform receiving of the far-end orthogonal frequency division multiplexing signal on the at least one orthogonal frequency division multiplexing subcarrier channel;
- An acquiring unit configured to receive a signal according to a near-end echo orthogonal frequency division multiplexing signal generated by the transmitted near-end orthogonal frequency division multiplexing signal, and the received far-end orthogonal frequency division multiplexing signal a parameter, the received signal is a superposed signal of a near-end echo signal and a far-end orthogonal frequency division multiplexed signal;
- An echo cancellation signal generating unit configured to generate echo cancellation according to the system parameters of the near-end echo orthogonal frequency division multiplexing signal and the far-end orthogonal frequency division multiplexing signal, and the near-end to-be-transmitted signal a signal, where the near-end to-be-transmitted signal is a signal before orthogonal frequency division multiplexing modulation of the near-end orthogonal frequency division multiplexing signal;
- a canceling unit configured to superimpose the echo cancellation signal and the received signal to cancel the near-end echo orthogonal frequency division multiplexing signal superimposed in the received signal, where the received signal is a near-end echo signal a superimposed signal with a far-end orthogonal frequency division multiplexed signal;
- the remote device includes: a sending unit, configured to send a remote orthogonal frequency division multiplexing signal;
- the transmitting unit Transmitting, by the transmitting unit, the far-end orthogonal frequency division multiplexing signal to the near-end device, where the near-end device receives the far-end orthogonal frequency division multiplexing signal by using the receiving unit, and simultaneously, the near The end device sends a near-end orthogonal frequency division multiplexing signal through the transmitting unit, and the near-end orthogonal frequency division multiplexing signal is generated by the hybrid coil, and the near-end echo orthogonal frequency division multiplexing signal is generated, and the near-end device according to the Obtaining a unit, acquiring the near-end echo orthogonal frequency division And multiplexing the signal with the far-end orthogonal frequency division multiplexing signal system parameter, the channel transfer function of the near-end echo path, and the near-end to-be-transmitted signal to generate an echo cancellation signal, and the canceling unit will The echo cancellation signal is superimposed with the received signal to cancel the near-end echo orthogonal frequency division multiplexed signal superimposed in the received signal.
- the transmission method and device provided by the embodiment of the present invention cancels the echo signal in the superposed signal by performing inverse orthogonal frequency division multiplexing modulation on the received signal, and performing inverse compensation with the simulated echo signal.
- the interference of the echo signal on the received signal is avoided, and the spectrum duplex transmission is realized for the signal transmitted by the orthogonal frequency division multiplexing technology, thereby improving the spectrum utilization rate.
- FIG. 1 is a flowchart of a method according to an embodiment of the present invention
- FIG. 2 is a schematic structural diagram of a device according to an embodiment of the present invention.
- FIG. 3 is a schematic structural diagram of an acquiring unit according to an embodiment of the present disclosure.
- FIG. 4 is a schematic structural diagram of another echo cancellation signal generating unit according to an embodiment of the present invention.
- FIG. 5 is a schematic structural diagram of a system according to an embodiment of the present invention.
- a transmission method using carrier modulation according to an embodiment of the present invention includes the following steps: S101.
- the near-end device performs simultaneous transmission of the near-end orthogonal frequency division multiplexing signal and the reception of the far-end orthogonal frequency division multiplexing signal on the orthogonal frequency division multiplexing subcarrier channel.
- the orthogonal frequency division multiplexing technique divides a channel into a number of orthogonal frequency division multiplexing subcarrier channels.
- the near-end transmit signal is converted into a parallel low-speed sub-data stream, modulated onto each orthogonal frequency division multiplexing sub-carrier channel to form a near-end orthogonal frequency division multiplexed signal for transmission, and at the same time, the near-end reception
- the far-end orthogonal frequency division multiplexed signal transmitted to the far end.
- Near-end Orthogonal Frequency Division Multiplexing (OFDM) signals that are locally modulated onto each Orthogonal Frequency Division Multiplexing subcarrier channel for transmission can be separated by using correlation techniques at the far end.
- OFDM Orthogonal Frequency Division Multiplexing
- the far-end modulation is applied to each orthogonal
- the far-end orthogonal frequency division multiplexing signals transmitted on the frequency division multiplexing subcarrier channel can be separated by using correlation techniques at the near end, thereby reducing mutual interference between orthogonal frequency division multiplexing subcarrier channel channels.
- the overlapping spectrum duplex transmission is combined with the orthogonal frequency division multiplexing technology, and the orthogonal frequency division multiplexing signal is transmitted and received on the at least one sub-orthogonal frequency division multiplexing subcarrier. .
- the receiving of the far-end orthogonal frequency division multiplexing signal further includes step S101 1.
- S101 performs de-orthogonal frequency division multiplexing modulation on the far-end orthogonal frequency division multiplexing signal.
- the near-end orthogonal frequency division multiplexing signal passes through the hybrid coil to form a near-end echo orthogonal frequency division multiplexing signal, which is orthogonal to the far end.
- the frequency division signals overlap to form a superposed orthogonal frequency division multiplexed signal. Therefore, when the near-end performs the inverse orthogonal frequency division multiplexing modulation on the received far-end orthogonal frequency division multiplexing signal, the near-end echo orthogonal frequency division multiplexing signal and the far-end orthogonal frequency division are combined.
- the OFDM orthogonal frequency division multiplexing modulation is simultaneously performed by the signal to form a superimposed signal.
- the near-end performs de-multiplexed frequency division multiplexing modulation on the received far-end orthogonal frequency division multiplexing signal, that is, performs orthogonal frequency division multiplexing modulation on the superposed orthogonal frequency division multiplexing signal.
- z 2 (t) _ CO(t)H echo )[cos( ⁇ 0 )] - / _ CO(t)H echo ( ⁇ 0 ) sin( ⁇ 0 ) + R_ ⁇ ( ⁇ ) ⁇ ( ⁇ 0 )
- the received signal is a superposed signal of a near-end echo signal and a far-end orthogonal frequency division multiplexed signal.
- the near-end echo orthogonal frequency division multiplexing signal is a signal that the near-end orthogonal frequency division multiplexing signal returns to the near end through the near-end hybrid coil during the far-end transmission;
- the multiplexed signal is a signal transmitted from the far end and transmitted to the near end through orthogonal frequency division multiplexing modulation.
- the system parameters for acquiring the received signal mainly include two cases:
- the far-end orthogonal frequency division multiplexing signal transmitted from the far end and the near-end echo orthogonal frequency division multiplexing signal inevitably generate some carrier phase difference.
- the near-end echo orthogonal frequency division multiplexing signal is not completely synchronized with the far-end orthogonal frequency division multiplexing signal, but when the received signal is de-multiplexed frequency division multiplexing, the orthogonal frequency of the transmitting end is still used.
- the multiplexed signal phase is subjected to de-orthogonal frequency division multiplexing modulation, so when echo cancellation is performed, the echo cancellation signal is synchronously adjusted so that the echo cancellation signal is orthogonally frequency-multiplexed with the near-end echo. Orthogonal frequency division multiplexing modulation is performed after synchronization.
- Obtaining a carrier phase difference between the near-end echo channel transfer function and the near-end echo orthogonal frequency division multiplexing signal and the far-end orthogonal frequency division multiplexing signal and specifically, adopting a channel estimation method to receive the far Channel-orthogonal frequency division multiplexing signal and near-end echo orthogonal frequency division multiplexing signal for channel estimation, obtaining channel transfer function of near-end echo path, and near-end echo orthogonal frequency division multiplexing signal and The carrier phase difference of the far-end orthogonal frequency division multiplexed signal.
- channel The estimation method refers to a process of estimating parameters in the channel from the received data by assuming a channel model to be estimated.
- the first method detects a mixed signal of a near-end echo orthogonal frequency division multiplexing signal and a far-end orthogonal frequency division multiplexing signal, and obtains a transfer function of the near-end echo channel and the a carrier phase difference between the near-end echo orthogonal frequency division multiplexing signal and the far-end orthogonal frequency division multiplexing signal;
- detecting the near-end echo orthogonal frequency division multiplexing signal respectively obtaining the transfer function of the near-end echo channel and the phase of the echo orthogonal frequency division multiplexing; and the far-end orthogonal frequency
- the sub-multiplexed signal is detected, and the phase of the far-end orthogonal frequency division multiplexing signal is obtained, and after calculation, the transfer function of acquiring the echo channel and the echo orthogonal frequency division multiplexing signal and the far-end orthogonal frequency division are obtained.
- the carrier phase difference of the multiplexed signal is obtained.
- the specific method is: on the one hand, channel estimation is performed on the echo orthogonal frequency division multiplexing signal by using a channel estimation method, and the phase or phase correlation of the near-end echo orthogonal frequency division multiplexing signal is obtained.
- the parameters, and the transfer function of the near-end echo channel, are represented by ⁇ ( «.).
- the far-end orthogonal frequency division multiplexing signal is estimated by the channel estimation method to obtain the phase or phase-related parameters of the far-end orthogonal frequency division multiplexing signal. After calculation, a transfer function for acquiring an echo channel and a carrier phase difference between the echo orthogonal frequency division multiplexing signal and the far-end orthogonal frequency division multiplexing signal are obtained.
- the channel transfer function of the near-end echo path of the near-end echo orthogonal frequency division multiplexing signal and the carrier phase difference sine of the near-end echo carrier signal and the far-end orthogonal frequency division multiplexing signal are obtained. a product of values, and a channel transfer function of the echo path and a product of the near-end echo carrier signal and a carrier phase difference cosine of the far-end orthogonal frequency division multiplexed signal.
- a channel estimation method is used to obtain a product of an echo channel transfer function and a carrier phase difference sine of the near-end echo carrier signal and the far-end orthogonal frequency division multiplexing signal, and a channel of the echo path a transfer function and a product of the near-end echo carrier signal and a carrier phase difference cosine of the far-end orthogonal frequency division multiplexed signal; that is, sin ⁇ . ) And H ecl w o) cos (0 o).
- SI 03 generating an echo cancellation signal according to the system parameters of the near-end echo orthogonal frequency division multiplexing signal and the far-end orthogonal frequency division multiplexing signal, and the near-end to-be-transmitted signal, where
- the near-end to-be-transmitted signal is a signal before the orthogonal frequency division multiplexing modulation of the near-end orthogonal frequency division multiplexing signal.
- a carrier phase difference between the near-end echo orthogonal frequency division multiplexing signal and the far-end orthogonal frequency division multiplexing signal, and a channel transfer function of the near-end echo path a carrier phase difference between the near-end echo orthogonal frequency division multiplexing signal and the far-end orthogonal frequency division multiplexing signal, and a channel transfer function of the near-end echo path, where the near-end to-be-transmitted signal is performed Adaptive filtering process to generate an echo cancellation signal.
- the adaptive filtering method is adopted for the near-end to-be-sent wave, and the signal after the OFDM orthogonal frequency-division multiplexed signal is decompressed is simulated to form an echo cancellation signal, which is used to solve the OFDM-corrected frequency-multiplexed modulation.
- the wave signals are superimposed in reverse to cancel the echo signals.
- the above adaptive filtering processing method is based on the estimation of the statistical characteristics of the input and output signals, and adopts a specific algorithm to automatically adjust the filter coefficients to achieve an optimal filtering characteristic.
- the channel transfer function of the near-end echo path when the channel transfer function of the near-end echo path is obtained, the product of the near-end echo carrier signal and the carrier phase difference sine of the far-end orthogonal frequency division multiplexed signal, and the channel transmission of the echo path a function and a product of the near-end echo carrier signal and a carrier phase difference cosine of the far-end orthogonal frequency division multiplexed signal, according to a channel transfer function of the near-end echo path and the near-end echo carrier a product of a signal and a carrier phase difference sine of the far-end orthogonal frequency division multiplexed signal, and a channel transfer function of the echo path and the near-end echo carrier signal and the far-end orthogonal frequency division multiplexing
- the product of the carrier phase difference cosine of the signal adaptively filtering the signal to be transmitted at the near end to generate an echo cancellation signal.
- S104 superimposing the echo cancellation signal and the received signal to cancel the near-end echo orthogonal frequency division multiplexing signal superimposed in the received signal, where the received signal is a near-end echo signal and a far-end positive The superimposed signal of the frequency division multiplexed signal.
- the received signal has a near-end echo orthogonal frequency division multiplexing signal and a far-end orthogonal frequency division multiplexing signal, and the echo cancellation signal is superimposed with the echo signal to cancel the echo signal.
- the orthogonal frequency division multiplexing duplex transmission method provided by the embodiment of the present invention cancels the reception by performing inverse frequency division multiplexing modulation on the received signal and performing inverse compensation with the simulated echo cancellation signal.
- the echo in the signal avoids the interference of the echo on the received signal, and realizes spectrum duplex transmission on the signal transmitted by the orthogonal frequency division multiplexing technology, thereby improving spectrum utilization.
- the embodiment of the present invention provides a transmission apparatus 200 using carrier modulation.
- the transmission apparatus 201 includes a transmitting unit 201, a receiving unit 202, an obtaining unit 203, an echo canceling signal generating unit 204, and a canceling unit 205.
- the sending unit 201 is configured to perform transmission of the near-end orthogonal frequency division multiplexing signal on the at least one orthogonal frequency division multiplexing subcarrier channel.
- the receiving unit 202 is configured to perform receiving of the far-end orthogonal frequency division multiplexing signal on the at least one orthogonal frequency division multiplexing subcarrier channel;
- the obtaining unit 203 is configured to obtain, according to the near-end echo orthogonal frequency division multiplexing signal generated by the transmitted near-end orthogonal frequency division multiplexing signal, and the received far-end orthogonal frequency division multiplexing signal, to obtain and receive a system parameter of the signal, wherein the received signal is a superposed signal of a near-end echo signal and a far-end orthogonal frequency division multiplexed signal;
- the echo cancellation signal generating unit 204 is configured to generate an echo according to the system parameters of the near-end echo orthogonal frequency division multiplexing signal and the far-end orthogonal frequency division multiplexing signal, and the near-end to-be-transmitted signal.
- Offset signal wherein the near-end to-be-transmitted signal is a signal before orthogonal frequency division multiplexing modulation of the near-end orthogonal frequency division multiplexing signal;
- the canceling unit 205 is configured to superimpose the echo cancellation signal and the received signal to cancel the near-end echo orthogonal frequency division multiplexing signal superimposed in the received signal, where the received signal is a near-end echo A superimposed signal of a signal and a far-end orthogonal frequency division multiplexed signal.
- the receiving unit 202 is further configured to perform OFDM orthogonal frequency division multiplexing modulation on the far-end orthogonal frequency division multiplexing signal.
- the obtaining unit 203 includes a first obtaining unit 203 1 and a second obtaining unit 2032, where
- the first obtaining unit 203 1 is specifically configured to: perform a near-end echo orthogonal frequency division multiplexing signal generated according to the transmitted near-end orthogonal frequency division multiplexing signal, and receive the far-end orthogonal frequency division And multiplexing the signal, acquiring a carrier phase difference between the near-end echo orthogonal frequency division multiplexing signal and the far-end orthogonal frequency division multiplexing signal, and a channel transfer function of the near-end echo path.
- the second obtaining unit 2032 is specifically configured to acquire a product of a channel transfer function of the near-end echo path and a carrier phase difference sine value of the near-end echo carrier signal and the far-end orthogonal frequency division multiplexing signal, and the Optionally, the first obtaining unit 203 1 further includes: a channel transfer function of the echo path and a product of the near-end echo carrier signal and the carrier phase difference cosine of the far-end orthogonal frequency division multiplexing signal An acquisition subunit 203 1 1 , a second acquisition subunit 203 12, wherein
- the first obtaining sub-unit 203 1 1 is configured to detect a near-end echo orthogonal frequency division multiplexing signal after the hybrid coil, and obtain a transfer function of the near-end echo channel and the near-end echo orthogonal frequency The phase of the multiplexed signal;
- the second obtaining sub-unit 203 12 is configured to detect the far-end orthogonal frequency division multiplexing signal, and obtain the phase of the far-end orthogonal frequency division multiplexing signal.
- the echo cancellation signal generating unit 204 includes: a first echo canceling signal generating unit 2041 and a second echo canceling signal generating unit 2042, wherein
- the first echo cancellation signal generating unit 2041 is configured to: according to the carrier phase difference of the near-end echo orthogonal frequency division multiplexing signal and the far-end orthogonal frequency division multiplexing signal, the near-end echo path a channel transfer function for adaptively filtering the signal to be transmitted at the near end Wave processing, generating an echo cancellation signal;
- the second echo cancellation signal generating unit 2042 is configured to multiply a product of a channel transfer function of the near-end echo path and a carrier phase difference sine of the far-end echo carrier signal and the far-end orthogonal frequency division multiplexing signal, and a channel transfer function of the echo path and a product of the near-end echo carrier signal and a carrier phase difference cosine of the far-end orthogonal frequency division multiplexed signal, adaptively adapting the near-end transmit signal Filter processing to generate an echo cancellation signal.
- the orthogonal frequency division multiplexing duplex transmission device provided by the embodiment of the present invention cancels the superimposed signal by performing inverse orthogonal frequency division multiplexing modulation on the received signal, and performing inverse compensation with the simulated echo signal.
- the echo signal in the middle avoids the interference of the echo signal on the received signal, and realizes spectrum duplex transmission on the signal transmitted by the orthogonal frequency division multiplexing technology, thereby improving spectrum utilization.
- the embodiment of the present invention further provides a transmission system 5 using carrier modulation, as shown in FIG. 5, including: a near-end device 51 and a remote device 52, wherein
- the near-end device 51 includes: a transmitting unit 511, a receiving unit 512, an obtaining unit 513, an echo canceling signal generating unit 514, and a canceling unit 515, where
- the sending unit 511 is configured to perform transmission of the near-orthogonal frequency division multiplexing signal on the orthogonal frequency division multiplexing subcarrier channel.
- the receiving unit 512 is configured to perform receiving of the remote orthogonal frequency division multiplexing signal on the orthogonal frequency division multiplexing subcarrier channel.
- the obtaining unit 513 is configured to obtain, according to the transmitted orthogonal orthogonal frequency division multiplexing signal generated by the near-end orthogonal frequency division multiplexing signal, and the received far-end orthogonal frequency division multiplexing signal, acquire system parameters of the received signal. ;
- the echo cancellation signal generating unit 514 is configured to process, according to the acquired system parameter of the received signal, at least two orthogonal frequency division multiplexing subcarrier signals in the near-end orthogonal frequency division multiplexing signal, so that After processing, generating an echo cancellation signal of one of the orthogonal frequency division multiplexing subcarriers, and performing cancellation processing on the received carrier signal;
- the canceling unit 515 is configured to superimpose the echo cancellation signal and the received signal to cancel the near-end echo orthogonal frequency division multiplexing signal superimposed in the received signal.
- the remote device 52 includes: a sending unit 521, configured to send a remote orthogonal frequency division multiplexing signal;
- the remote device 52 sends the remote orthogonal frequency division multiplexed signal to the near-end device through the sending unit 521, and the near-end device receives the far-end orthogonal frequency division multiplexed signal through the receiving unit 512, and at the same time, the near end
- the device sends a near-end orthogonal frequency division multiplexing signal through the transmitting unit 5 1 1 , and the near-end orthogonal frequency division multiplexing signal is generated by the hybrid coil, and the near-end echo orthogonal frequency division multiplexing signal is generated, the near end
- the device obtains the system parameter of the received signal according to the obtaining unit 5 13 , and the echo canceling signal generating unit 514 generates an echo canceling signal according to the system parameter of the received signal and the signal to be transmitted at the near end, and the canceling unit 5 15 will return
- the wave cancellation signal is superimposed with the received signal to cancel the echo orthogonal frequency division multiplexed signal superimposed in the received signal.
- the near-end device 51 is the transmission device 200 in Fig. 2, and can be processed in accordance with the flow described in Fig. 1.
- the transmission system provided by the embodiment of the invention cancels the echo signal of the received signal by performing inverse orthogonal frequency division multiplexing modulation on the received signal, thereby canceling the echo signal in the received signal, thereby avoiding The echo signal interferes with the received signal, and performs spectrum duplex transmission on the signal transmitted by the orthogonal frequency division multiplexing technology to improve spectrum utilization.
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Abstract
本发明实施例提供一种利用载波调制的传输方法,涉及通信领域,用以解决使用正交频分复用技术传输中的回波信号干扰导致频谱双工传输无法正常进行。其中,该方法,包括:在正交频分复用信道上,同时进行近端正交频分复用信号的发送与进行远端正交频分复用信号的接收;根据获取回波正交频分复用信号与远端正交频分复用信号的载波相位差,以及回波通路的信道传递函数;根据所述载波相位差、近端回波通路信道传递函数,以及近端待发送信号,生成回波抵消信号,将回波抵消信号与接收信号进行叠加,抵消接收信号中所叠加的回波正交频分复用信号。
Description
一种利用载波调制的传输方法、 装置和*** 技术领域
本发明涉及通信领域, 尤其涉及一种利用载波调制的传输方法、 装 置和***。
背景技术
OFDM(Orthogonal Frequency Division Multiplexing) ^7正交频分复用 技术, 实际上 OFDM是 MCM ( Multi-Carrier Modulation, 多载波调制 ) 的一种。 其主要思想是: 将信道分成若干正交子信道, 将高速数据信号 转换成并行的低速子数据流, 调制到在每个子信道上进行传输。 正交信 号可以通过在接收端采用相关技术来分开, 这样可以减少子信道之间的 相互干扰 ISI ( Inter-Symbol Interference , 符号干扰) , 除此之外的带宽 利用率高、 实现简单等特点使 OFDM在无线通信领域的应用越来越广, 比如, WLAN ( Wireless Local Area Networks, 无线局 i或网) ***, 基于 正交频分复用多地址的 WiMax***以及第 4代移动通讯***( 4G )等都 是基于 OFDM技术***。
OSD ( Overlapped Spectrum Duplex , 重叠频谱双工) 技术是上下行 均采用频谱重叠技术进行信号的发送与接收, OSD技术使得上下行信号 在同一时间能够完全复用所有频带, 频谱效率相对传统 ( Frequency Division Duplexing , 频分双工) 或 TDD ( Time Division Duplexing, 时分 双工) 方式有望提高 1 倍。 但是由于传输距离越来越短, 信道的延时越 来越小, 让近端设备与远端设备发送信号和接收信号在时间上几乎完全 正交, 因此发送信号通过混合变换线圈 (hybrid ) 回到本端的接收器的回 波 (Echo ) 信号和远端设备发送过来的接收信号几乎完全重叠, 对接收 信号产生严重的干扰, 无法实现在正交频分复用技术下进行频谱双工传 输。
发明内容
本发明的实施例提供一种利用载波调制的传输方法、 装置及系 统, 能够对使用正交频分复用技术传输的信号实现频谱双工传输,
提高频谱利用率。
为达到上述目 的, 本发明的实施例采用如下技术方案:
一种利用载波调制的传输方法, 包括:
近端在正交频分复用子载波信道上, 同时进行近端正交频分复 用信号的发送与进行远端正交频分复用信号的接收;
根据发送的近端正交频分复用信号产生的近端回波正交频分复 用信号, 和接收到的所述远端正交频分复用信号, 获取接收信号的 ***参数, 所述接收信号为近端回波信号与远端正交频分复用信号 的叠加信号;
根据所述近端回波正交频分复用信号与所述远端正交频分复用 信号的***参数, 以及近端待发送信号, 生成回波抵消信号, 其中, 所述近端待发送信号为所述近端正交频分复用信号进行正交频分复 用调制前的信号;
将所述回波抵消信号与接收信号进行叠加, 来抵消接收信号中 所叠加的近端回波正交频分复用信号, 所述接收信号为近端回波信 号与远端正交频分复用信号的叠加信号
一种利用载波调制的传输装置, 包括:
发送单元, 用于在至少一个正交频分复用子载波信道上, 进行 近端正交频分复用信号的发送;
接收单元, 用于在至少一个正交频分复用子载波信道上, 进行 远端正交频分复用信号的接收;
获取单元, 根据发送的近端正交频分复用信号产生的近端回波 正交频分复用信号, 和接收到的所述远端正交频分复用信号, 获取 接收信号的***参数, 所述接收信号为近端回波信号与远端正交频 分复用信号的叠加信号;
回波抵消信号产生单元, 用于根据所述近端回波正交频分复用 信号与所述远端正交频分复用信号的***参数, 以及近端待发送信 号, 生成回波抵消信号, 其中, 所述近端待发送信号为所述近端正 交频分复用信号进行正交频分复用调制前的信号;
抵消单元,用于将所述回波抵消信号与接收到的信号进行叠加, 来抵消接收信号中所叠加的近端回波正交频分复用信号, 所述接收 信号为近端回波信号与远端正交频分复用信号的叠加信号
一种利用载波调制的传输***, 其特征在于, 包括: 近端装置 和远端装置, 其中,
近端装置包括: 发送单元, 接收单元, 回波抵消信号产生单元, 抵消单元, 其中,
发送单元, 用于在至少一个正交频分复用子载波信道上, 进行 近端正交频分复用信号的发送;
接收单元, 用于在至少一个正交频分复用子载波信道上, 进行 远端正交频分复用信号的接收;
获取单元, 根据发送的近端正交频分复用信号产生的近端回波 正交频分复用信号, 和接收到的所述远端正交频分复用信号, 获取 接收信号的***参数, 所述接收信号为近端回波信号与远端正交频 分复用信号的叠加信号;
回波抵消信号产生单元, 用于根据所述近端回波正交频分复用 信号与所述远端正交频分复用信号的***参数, 以及近端待发送信 号, 生成回波抵消信号, 其中, 所述近端待发送信号为所述近端正 交频分复用信号进行正交频分复用调制前的信号;
抵消单元,用于将所述回波抵消信号与接收到的信号进行叠加, 来抵消接收信号中所叠加的近端回波正交频分复用信号, 所述接收 信号为近端回波信号与远端正交频分复用信号的叠加信号;
远端装置包括: 发送单元用于进行远端正交频分复用信号的发 送;
所述远端装置通过发送单元将远端正交频分复用信号发送到近 端设备, 所述近端设备通过接收单元接收所述远端正交频分复用信 号, 同时, 所述近端设备通过发送单元发送近端正交频分复用信号, 所述近端正交频分复用信号经混合线圈后, 产生的近端回波正交频 分复用信号, 近端设备根据获取单元, 获取所述近端回波正交频分
复用信号与所述远端正交频分复用信号***参数, 所述近端回波通 路的信道传递函数, 以及所述近端待发送信号, 生成回波抵消信号, 抵消单元将所述回波抵消信号与接收信号进行叠加, 来抵消接收信 号中所叠加的近端回波正交频分复用信号。
本发明实施例提供的传输方法及装置, 通过对接收到的信号进 行解正交频分复用调制后, 与模拟出的回波信号进行反相补偿, 抵 消了叠加信号中的回波信号, 避免了回波信号对接收信号的干扰, 对使用正交频分复用技术传输的信号实现频谱双工传输, 提高频谱 利用率。
附图说明
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简单地介绍, 显而易见地, 下面描述中的附图仅仅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的前提下, 还可以 根据这些附图获得其他的附图。
图 1 为本发明实施例提供的一种方法流程图;
图 2为本发明实施例提供的一种装置结构示意图;
图 3为本发明实施例提供的一获取单元结构示意图;
图 4为本发明实施例提供的另一回波抵消信号产生单元结构示 意图;
图 5为本发明实施例提供的一种***结构示意图。
具体实施方式
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, 所描述的实施例仅仅是本发明 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。
本发明实施例提供的一种利用载波调制的传输方法, 如图 1 所 示, 包括以下步骤:
S 101、 近端设备在正交频分复用子载波信道上, 同时进行近端 正交频分复用信号的发送与进行远端正交频分复用信号的接收。
正交频分复用技术是将信道分成若干正交频分复用子载波信 道。 在近端将近端待发送信号转换成并行的低速子数据流, 调制到 每个正交频分复用子载波信道上形成近端正交频分复用信号进行传 输, 同时, 近端接收到远端发送的远端正交频分复用信号。 近端调 制到每个正交频分复用子载波信道上进行传输的近端正交频分复用 信号可以通过在远端采用相关技术来分开, 同样的, 远端调制到每 个正交频分复用子载波信道上进行传输的远端正交频分复用信号, 可以通过在近端采用相关技术来分开, 这样可以减少正交频分复用 子载波信道信道之间的相互干扰。 在本发明实施例中, 将重叠频谱 双工传输与正交频分复用技术结合, 采用在至少一个子正交频分复 用子载波上, 对正交频分复用信号进行发送与接收。
在进行远端正交频分复用信号的接收还包括步骤 S 101 1。
S 101 对所述远端正交频分复用信号进行解正交频分复用调 制。
由于近端在发送近端正交频分复用信号时, 近端正交频分复用 信号会通过混合线圈后, 形成近端回波正交频分复用信号, 与远端 的正交频分信号重叠, 形成叠加正交频分复用信号。 因此, 近端对 接收到的远端正交频分复用信号进行解正交频分复用调制时, 就会 对近端回波正交频分复用信号与远端正交频分复用信号同时进行解 正交频分复用调制, 形成叠加信号。
具体的, 近端对接收到的远端正交频分复用信号进行解正交频 分复用调制, 即对叠加正交频分复用信号进行解正交频分复用调制。
本发明实施例中接收到的叠加正交频分复用信号用 Z3 W表示, z, {t) = j * zx {t) + z2 {t) 其中, 对接收信号进行解正交频分复用调制后, 接收信号的实 部 w其形式为:
^( = -^_ CO (t)Hech0 (ω0 )[- sin( 0O)] + -I_CO (t)Hecho (ω0 ) cos( 0o) + -I_CPE (ί)Η(ω0 ) 叠加正交频分复用信号的虚部 (0其形式为: z2 (t) = _ CO(t)Hecho )[cos(^0 )] - / _ CO(t)Hecho (ω0 ) sin(^0 ) + R_ ΟΡΕ(ί)Η(ω0 ) 在上式中 w_cO(0和 /_cO(t)分别表示近端待发送信号经过快速 傅里叶逆变换 IFFT后的实部和虚部, 为近端回波信道的传递 函数 , R—cPE(t和 /_CPE(t)分别为远端待发送信号经过快速傅里叶逆 变换 IFFT后的实部和虚部, ^( 。)表示远端回波信道传递函数。
所以
= '* w_cO(t)HecA。 )[— ^(^)]—^— ^)^^^) ^)—^—^^)^^) { ^_ CO(t)Hecho (ω0 )[cos(0o )] - / _ CO(t)Hecho (ω0 ) sin(^0 ) + CPE(t)H( , )| = - (e,)Hecho )[ · * R _ CO(t) + 1 _ CO(t)] + \ cos(^0 )Hech0 (ω0 )[R _ CO(t) + CO(t)] + HO0 _ CPE(t) + j*I _ CPE(t)] 等式两边进行快速傅里叶 FFT变换后, 等式为: (z3 (t)) =— sin(^0 )Hecho (ω0 )fft[j * R _ CO(t) + 1 _ CO(t)]
+ cos(^0 )Hecho K) [i?_ CO(t) + CO(t)]
+ _ CPE(t) + * / _ CPE(t)]
= sin(^0 )Hecho )IFFT _ Input _ CO(-f) * j
+ \ cos(^0 )Hecho (ω0 )IFFT _ Input _ CO(f)
+ ^Η(ω0 )IFFT _ Input _ CPE(f) 其中, /" t_CO(/)表示近端待发送信号。
从而, 远端发过来的信号为:
- Η(ω0 )IFFT _ Input _ CPE(f) = fft(z3 (t)) - - sin(^0 )H echo (ω0 )IFFT _ Input _ CO(-f) * j
- \ cos(^0 )Hech0 (ω0 )IFFT _ Input _ CO(f)
S 102、 根据发送的近端正交频分复用信号产生的近端回波正交 频分复用信号, 和接收到的所述远端正交频分复用信号, 获取接收 信号的***参数, 所述接收信号为近端回波信号与远端正交频分复 用信号的叠加信号。
其中, 近端回波正交频分复用信号为近端正交频分复用信号在 向远端传输过程中, 通过近端混合线圈而回到近端的信号; 远端正 交频分复用信号为从远端所发送的经过正交频分复用调制后传送到 近端的信号。
在本发明实施例中, 所述获取接收信号的***参数主要包括两 种情况:
第一种情况, 获取所述近端回波正交频分复用信号与所述远端 正交频分复用信号的载波相位差, 以及近端回波通路的信道传递函 数。
在信号传输过程中, 由于延时等原因, 会使得从远端传来的远 端正交频分复用信号与近端回波正交频分复用信号不可避免的产生 一些载波相位差, 用 表示。 近端回波正交频分复用信号与远端正 交频分复用信号不完全同步, 但是, 对接收到的信号进行解正交频 分复用调制时, 仍然按照发送端的正交频分复用信号相位进行解正 交频分复用调制, 所以在进行回波抵消时, 要对回波抵消信号进行 同步调整, 使得回波抵消信号与近端回波正交频分复用在解正交频 分复用调制后同步。
获取所述近端回波信道传递函数和近端回波正交频分复用信号 与远端正交频分复用信号的载波相位差, 具体的, 采用信道估计的 方法对接收到的远端正交频分复用信号和近端的回波正交频分复用 信进行信道估计, 获取到近端回波通路的信道传递函数, 和近端回 波正交频分复用信号与远端正交频分复用信号的载波相位差。 信道
估计方法是指, 从接收到的数据中, 通过假定所要估计的信道模型, 对该信道中参数进行估计的过程。
在获取载波相位差的过程中, 根据获取的路径不同, 又可以有 两种获取方式:
第一种, 对近端回波正交频分复用信号和远端正交频分复用信 号混合后的信号进行检测, 通过信道估计方法, 获取近端回波信道 的传递函数和所述近端回波正交频分复用信号与远端正交频分复用 信号的载波相位差;
第二种, 分别对近端回波正交频分复用信号进行检测, 获取近 端回波信道的传递函数和所述回波正交频分复用的相位; 和对远端 正交频分复用信号进行检测, 获取远端正交频分复用信号的相位, 经过计算, 获得获取回波信道的传递函数和所述回波正交频分复用 信号与远端正交频分复用信号的载波相位差。
对于第二种, 具体方法为, 一方面, 通过采用信道估计的方法 对回波正交频分复用信号进行信道估计, 获取近端回波正交频分复 用信号的相位或者与相位相关的参数, 和近端回波信道的传递函数, 用 ^ («。)表示。 另一方面, 通过信道估计的方法对远端正交频分复 用信号进行估计, 获取远端正交频分复用信号的相位或者与相位相 关的参数。 经过计算, 获得获取回波信道的传递函数和所述回波正 交频分复用信号与远端正交频分复用信号的载波相位差。
第二种情况, 获取近端回波正交频分复用信号近端回波通路的 信道传递函数与所述近端回波载波信号与远端正交频分复用信号的 载波相位差正弦值的乘积, 以及所述回波通路的信道传递函数与所 述近端回波载波信号与所述远端正交频分复用信号的载波相位差余 弦值的乘积。
具体的, 采用信道估计的方法获取回波信道传递函数与所述近 端回波载波信号与远端正交频分复用信号的载波相位差正弦值的乘 积, 以及所述回波通路的信道传递函数与所述近端回波载波信号与 远端正交频分复用信号的载波相位差余弦值的乘积; 即 )sin^。)
和 H ecl wo) cos(0o)。
S I 03、 根据所述近端回波正交频分复用信号与所述远端正交频 分复用信号的***参数, 以及近端待发送信号, 生成回波抵消信号, 其中, 所述近端待发送信号为所述近端正交频分复用信号进行正交 频分复用调制前的信号。
其中, 当获取获取所述近端回波正交频分复用信号与所述远端 正交频分复用信号的载波相位差, 以及近端回波通路的信道传递函 数时, 则根据所述近端回波正 交频分复用信号与所述远端正交频分复用信号的载波相位差、 所述 近端回波通路的信道传递函数, 对所述近端待发送信号进行自适应 滤波处理, 产生回波抵消信号。
对近端待发送波采用 自适滤波应处理方法, 模拟回波正交频分 复用信号解载后的信号, 形成回波抵消信号, 用于对解正交频分复 用调制后的回波信号反相叠加, 抵消回波信号。 上述的 自适应滤波 处理方法是以输入和输出信号的统计特性的估计为依据, 采取特定 算法自动地调整滤波器系数, 使其达到最佳滤波特性的一种处理方 法。
另外, 当获取近端回波通路的信道传递函数与所述近端回波载 波信号与远端正交频分复用信号的载波相位差正弦值的乘积, 以及 所述回波通路的信道传递函数与所述近端回波载波信号与所述远端 正交频分复用信号的载波相位差余弦值的乘积, 则根据近端回波通 路的信道传递函数与所述近端回波载波信号与远端正交频分复用信 号的载波相位差正弦值的乘积, 以及所述回波通路的信道传递函数 与所述近端回波载波信号与所述远端正交频分复用信号的载波相位 差余弦值的乘积, 对所述近端待发送信号进行自适应滤波处理, 产 生回波抵消信号。
根据近端回波信道传递函数 Κω 与所述近端回波载波信号与 远端正交频分复用信号的载波相位差正弦值的乘积, 以及所述回波 通路的信道传递函数与所述近端回波载波信号与远端正交频分复用
信号的载波相位差余弦值的乘积; 即 * 。)sin^。;>和 υ«χ , 模 拟回波正交频分复用信号解载后的信号, 形成回波抵消信号, 用于 对解正交频分复用调制后的回波信号反相补偿, 抵消回波信号。
S 104、 将所述回波抵消信号与接收信号进行叠加, 来抵消接收 信号中所叠加的近端回波正交频分复用信号, 所述接收信号为近端 回波信号与远端正交频分复用信号的叠加信号。
接收信号中有近端回波正交频分复用信号以及远端正交频分复 用信号, 利用回波抵消信号与回波信号进行叠加, 相抵消的原理, 消除回波信号。
本发明实施例提供的正交频分复用双工传输方法, 通过对接收 到的信号进行解正交频分复用调制后, 与模拟出的回波抵消信号进 行反相补偿, 抵消了接收到信号中的回波, 避免了回波对接收信号 的干扰, 对使用正交频分复用技术传输的信号实现频谱双工传输, 提高频谱利用率。
本发明实施例提供了一种利用载波调制的传输装置 200 , 如图 2 所示, 包括: 发送单元 201 , 接收单元 202 , 获取单元 203、 回波抵 消信号产生单元 204、 抵消单元 205。
发送单元 201 , 用于在至少一个正交频分复用子载波信道上, 进行近端正交频分复用信号的发送;
接收单元 202 , 用于在至少一个正交频分复用子载波信道上, 进行远端正交频分复用信号的接收;
获取单元 203 , 用于根据发送的近端正交频分复用信号产生的 近端回波正交频分复用信号, 和接收到的所述远端正交频分复用信 号, 获取接收信号的***参数, 所述接收信号为近端回波信号与远 端正交频分复用信号的叠加信号;
回波抵消信号产生单元 204 , 用于根据所述近端回波正交频分 复用信号与所述远端正交频分复用信号的***参数, 以及近端待发 送信号, 生成回波抵消信号, 其中, 所述近端待发送信号为所述近 端正交频分复用信号进行正交频分复用调制前的信号;
抵消单元 205 , 用于将所述回波抵消信号与接收到的信号进行 叠加, 来抵消接收信号中所叠加的近端回波正交频分复用信号, 所 述接收信号为近端回波信号与远端正交频分复用信号的叠加信号。
其中, 所述接收单元 202还用于对所述远端正交频分复用信号 进行解正交频分复用调制。
如图 3所示, 获取单元 203 包括第一获取单元 203 1、 第二获取 单元 2032 , 其中,
第一获取单元 203 1具体用于,根据发送的所述近端正交频分复 用信号产生的近端回波正交频分复用信号, 和接收到的所述远端正 交频分复用信号, 获取所述近端回波正交频分复用信号与所述远端 正交频分复用信号的载波相位差, 以及近端回波通路的信道传递函 数。
第二获取单元 2032具体用于,获取近端回波通路的信道传递函 数与所述近端回波载波信号与远端正交频分复用信号的载波相位差 正弦值的乘积, 以及所述回波通路的信道传递函数与所述近端回波 载波信号与所述远端正交频分复用信号的载波相位差余弦值的乘积 可选的, 第一获取单元 203 1还包括: 第一获取子单元 203 1 1 , 第二获取子单元 203 12,其中,
第一获取子单元 203 1 1 , 用于对经过混合线圈后的近端回波正 交频分复用信号进行检测, 获取近端回波信道的传递函数和所述近 端回波正交频分复用信号的相位;
第二获取子单元 203 12 , 用于对远端正交频分复用信号进行检 测, 获取远端正交频分复用信号的相位。
另外, 如图 4所示, 回波 氏消信号产生单元 204包括: 第一回波抵消信号产生单元 2041、 第二回波抵消信号产生单元 2042 , 其中,
第一回波抵消信号产生单元 2041 用于根据所述近端回波正交 频分复用信号与所述远端正交频分复用信号的载波相位差、 所述近 端回波通路的信道传递函数, 对所述近端待发送信号进行自适应滤
波处理, 产生回波抵消信号;
第二回波抵消信号产生单元 2042 用于根据近端回波通路的信 道传递函数与所述近端回波载波信号与远端正交频分复用信号的载 波相位差正弦值的乘积, 以及所述回波通路的信道传递函数与所述 近端回波载波信号与所述远端正交频分复用信号的载波相位差余弦 值的乘积, 对所述近端待发送信号进行自适应滤波处理, 产生回波 抵消信号。
本发明实施例提供的正交频分复用双工传输装置, 通过对接收 到的信号进行解正交频分复用调制后, 与模拟出的回波信号进行反 相补偿, 抵消了叠加信号中的回波信号, 避免了回波信号对接收信 号的干扰, 对使用正交频分复用技术传输的信号实现频谱双工传输, 提高频谱利用率。
本发明实施例还提供了一种利用载波调制的传输*** 5, 如图 5 所示, 包括: 近端装置 51和远端装置 52, 其中,
近端装置 51 包括:发送单元 511,接收单元 512,获取单元 513、 回波抵消信号产生单元 514, 抵消单元 515, 其中,
发送单元 511, 用于在正交频分复用子载波信道上, 进行近端 正交频分复用信号的发送;
接收单元 512, 用于在正交频分复用子载波信道上, 进行远端 正交频分复用信号的接收;
获取单元 513, 用于根据发送的近端正交频分复用信号产生的 回波正交频分复用信号, 和接收到的远端正交频分复用信号, 获取 接收信号的***参数;
回波抵消信号产生单元 514, 用于根据所述获取的接收信号的 ***参数, 对近端的正交频分复用信号中,至少两个正交频分复用子 载波信号进行处理, 使得经过处理后生成其中一个正交频分复用子 载波的回波抵消信号, 对接收到的载波信号进行抵消处理;
抵消单元 515, 用于将回波抵消信号与接收到的信号进行叠加, 来抵消接收信号中所叠加的近端回波正交频分复用信号。
远端装置 52包括:发送单元 521用于进行远端正交频分复用信 号的发送;
所述远端装置 52通过发送单元 521将远端的正交频分复用信号 发送到近端设备, 近端设备通过接收单元 5 12接收远端正交频分复 用信号, 同时, 近端设备通过发送单元 5 1 1 发送近端正交频分复用 信号, 所述近端正交频分复用信号经混合线圈后, 产生的近端回波 正交频分复用信号, 近端设备根据获取单元 5 13 , 获取接收信号的 ***参数, 回波抵消信号产生单元 5 14根据所述接收信号的***参 数, 以及近端待发送信号, 生成回波抵消信号, 抵消单元 5 15 将回 波抵消信号与接收到的信号进行叠加, 来抵消接收信号中所叠加的 回波正交频分复用信号。
进一步地, 所述近端装置 5 1就是图 2中的传输装置 200 , 并且 可以按照图 1 中记载的流程进行处理。
本发明实施例提供的传输***, 通过对接收到的信号进行解正 交频分复用调制后, 与模拟出的回波信号进行反相补偿, 抵消了接 收信号中的回波信号, 避免了回波信号对接收信号的干扰, 对使用 正交频分复用技术传输的信号实现频谱双工传输, 提高频谱利用率。
以上所述, 仅为本发明的具体实施方式, 但本发明的保护范围 并不局限于此, 任何熟悉本技术领域的技术人员在本发明揭露的技 术范围内, 可轻易想到变化或替换, 都应涵盖在本发明的保护范围 之内。 因此, 本发明的保护范围应所述以权利要求的保护范围为准。
Claims
1、 一种利用载波调制的传输方法, 其特征在于, 包括:
近端在正交频分复用子载波信道上,同时进行近端正交频分复用 信号的发送与进行远端正交频分复用信号的接收;
根据发送的近端正交频分复用信号产生的近端回波正交频分复用信 号, 和接收到的所述远端正交频分复用信号, 获取接收信号的***参数, 所述接收信号为近端回波信号与远端正交频分复用信号的叠加信号;
根据所述近端回波正交频分复用信号与所述远端正交频分复用信号 的***参数, 以及近端待发送信号, 生成回波抵消信号, 其中, 所述近端 待发送信号为所述近端正交频分复用信号进行正交频分复用调制前的信 号;
将所述回波抵消信号与接收信号进行叠加, 来抵消接收信号中所叠加 的近端回波正交频分复用信号, 所述接收信号为近端回波信号与远端正交 频分复用信号的叠加信号。
2、 根据权利要求 1 所述方法, 其特征在于, 进行远端正交频分复用 信号的接收还包括: 对所述远端正交频分复用信号进行解正交频分复用调 制。
3、 根据权利要求 1 所述方法, 其特征在于, 获取接收信号的***参 数包括:
获取所述近端回波正交频分复用信号与所述远端正交频分复用信号 的载波相位差, 以及近端回波通路的信道传递函数。
4、 根据权利要求 1 所述方法, 其特征在于, 获取接收信号的***参 数还包括:
获取所述近端回波通路的信道传递函数与所述近端回波载波信号与 远端正交频分复用信号的载波相位差正弦值的乘积, 以及所述回波通路的 信道传递函数与所述近端回波载波信号与所述远端正交频分复用信号的载 波相位差余弦值的乘积。
5、 根据权利要求 3 所述方法, 其特征在于, 获取所述近端回波正交 频分复用信号与远端正交频分复用信号的载波相位差包括: 对接收到的所述近端回波正交频分复用信号和所述远端正交频分复 用信号进行检测, 获取所述近端回波信道的传递函数和所述近端回波正交 频分复信号与所述远端正交频分复信号的载波相位差。
6、 根据权利要求 3 所述方法, 其特征在于, 获取所述近端回波正交 频分复用信号与所述远端正交频分复用信号的载波相位差包括:
分别对经过混合线圈后的所述近端回波正交频分复用信号进行检测, 获取所述近端回波信道的传递函数和所述近端回波正交频分复用信号的相 位, 和对远端正交频分复用信号进行检测, 获取所述远端正交频分复用信 号的相位。
7、 根据权利要求 5 所述方法, 其特征在于, 所述根据所述近端回波 正交频分复用信号与所述远端正交频分复用信号的载波相位差、 所述近端 回波通路的信道传递函数, 以及近端待发送信号, 生成回波抵消信号前, 还包括:
根据获取的所述近端回波正交频分复用信号的相位和获取的所述远 端正交频分复用信号的相位, 进过计算得出载波相位差值。
8、 根据权利要求 3 所述方法, 其特征在于, 获取所述近端回波正交 频分复用信号与所述远端正交频分复用信号的载波相位差, 以及近端回波 通路的信道传递函数后, 还包括:
根据所述近端回波正交频分复用信号与所述远端正交频分复用信号 的载波相位差、 所述近端回波通路的信道传递函数, 对所述近端待发送信 号进行自适应滤波处理, 产生回波抵消信号。
9、 根据权利要求 4所述方法, 其特征在于, 获取近端回波通路的信 道传递函数与所述近端回波载波信号与远端正交频分复用信号的载波相位 差正弦值的乘积, 以及所述回波通路的信道传递函数与所述近端回波载波 信号与所述远端正交频分复用信号的载波相位差余弦值的乘积后,还包括: 根据近端回波通路的信道传递函数与所述近端回波载波信号与远端 正交频分复用信号的载波相位差正弦值的乘积, 以及所述回波通路的信道 传递函数与所述近端回波载波信号与所述远端正交频分复用信号的载波相 位差余弦值的乘积, 对所述近端待发送信号进行自适应滤波处理, 产生回 波抵消信号。
10、 一种利用载波调制的传输装置, 其特征在于, 包括:
发送单元, 用于在至少一个正交频分复用子载波信道上, 进行近端正 交频分复用信号的发送;
接收单元, 用于在至少一个正交频分复用子载波信道上, 进行远端正 交频分复用信号的接收;
获取单元, 根据发送的近端正交频分复用信号产生的近端回波正交频 分复用信号, 和接收到的所述远端正交频分复用信号, 获取接收信号的系 统参数, 所述接收信号为近端回波信号与远端正交频分复用信号的叠加信 号;
回波抵消信号产生单元, 用于根据所述近端回波正交频分复用信号与 所述远端正交频分复用信号的***参数, 以及近端待发送信号, 生成回波 抵消信号, 其中, 所述近端待发送信号为所述近端正交频分复用信号进行 正交频分复用调制前的信号;
抵消单元, 用于将所述回波抵消信号与接收到的信号进行叠加, 来抵 消接收信号中所叠加的近端回波正交频分复用信号, 所述接收信号为近端 回波信号与远端正交频分复用信号的叠加信号。
1 1、 根据权利要求 10所述传输装置, 其特征在于, 所述接收单元还 用于对所述远端正交频分复用信号进行解正交频分复用调制。
12、 根据权利要求 10所述传输装置, 其特征在于, 所述获取单元具 体用于,
根据发送的所述近端正交频分复用信号产生的近端回波正交频分复 用信号, 和接收到的所述远端正交频分复用信号, 获取所述近端回波正交 频分复用信号与所述远端正交频分复用信号的载波相位差, 以及近端回波 通路的信道传递函数。
13、 根据权利要求 10所述传输装置, 其特征在于, 所述获取单元还 用于,
获取近端回波通路的信道传递函数与所述近端回波载波信号与远端 正交频分复用信号的载波相位差正弦值的乘积, 以及所述回波通路的信道 传递函数与所述近端回波载波信号与所述远端正交频分复用信号的载波相 位差余弦值的乘积。
14、 根据权利要求 12所述传输装置, 其特征在于, 所述获取单元还 包括:
第一获取子单元, 用于对经过混合线圈后的所述近端回波正交频分复 用信号进行检测, 获取所述近端回波信道的传递函数和所述回波正交频分 复用信号的相位;
第二获取子单元, 用于对所述远端正交频分复用信号进行检测, 获取 所述远端正交频分复用信号的相位。
15、 根据权利要求 14所述传输装置, 其特征在于, 所述回波抵消信 号产生单元还用于根据获取的所述近端回波正交频分复用信号的相位和获 取的所述远端正交频分复用信号的相位, 进过计算得出载波相位差值。
16、 根据权利要求 12所述传输装置, 其特征在于, 所述回波抵消信 号产生单元具体用于, 根据所述近端回波正交频分复用信号与所述远端正 交频分复用信号的载波相位差、 所述近端回波通路的信道传递函数, 对所 述近端待发送信号进行自适应滤波处理, 产生回波抵消信号。
17、 根据权利要求 13 所述传输装置, 其特征在于, 所述回波抵消信 号产生单元还用于, 根据近端回波通路的信道传递函数与所述近端回波载 波信号与远端正交频分复用信号的载波相位差正弦值的乘积, 以及所述回 波通路的信道传递函数与所述近端回波载波信号与所述远端正交频分复用 信号的载波相位差余弦值的乘积, 对所述近端待发送信号进行自适应滤波 处理, 产生回波抵消信号。
18、 一种利用载波调制的传输***, 其特征在于, 包括: 近端装置和 远端装置, 其中,
近端装置包括: 发送单元, 接收单元, 回波抵消信号产生单元, 抵消 单元, 其中,
发送单元, 用于在至少一个正交频分复用子载波信道上, 进行近端正 交频分复用信号的发送;
接收单元, 用于在至少一个正交频分复用子载波信道上, 进行远端正 交频分复用信号的接收;
获取单元, 根据发送的近端正交频分复用信号产生的近端回波正交频 分复用信号, 和接收到的所述远端正交频分复用信号, 获取接收信号的系 统参数, 所述接收信号为近端回波信号与远端正交频分复用信号的叠加信 号;
回波抵消信号产生单元, 用于根据所述近端回波正交频分复用信号与 所述远端正交频分复用信号的***参数, 以及近端待发送信号, 生成回波 抵消信号, 其中, 所述近端待发送信号为所述近端正交频分复用信号进行 正交频分复用调制前的信号;
抵消单元, 用于将所述回波抵消信号与接收到的信号进行叠加, 来抵 消接收信号中所叠加的近端回波正交频分复用信号, 所述接收信号为近端 回波信号与远端正交频分复用信号的叠加信号;
远端装置包括: 发送单元用于进行远端正交频分复用信号的发送; 所述远端装置通过发送单元将远端正交频分复用信号发送到近端设 备, 所述近端设备通过接收单元接收所述远端正交频分复用信号, 同时, 所述近端设备通过发送单元发送近端正交频分复用信号, 所述近端正交频 分复用信号经混合线圈后, 产生的近端回波正交频分复用信号, 近端设备 根据获取单元, 获取所述近端回波正交频分复用信号与所述远端正交频分 复用信号***参数, 所述近端回波通路的信道传递函数, 以及所述近端待 发送信号, 生成回波抵消信号, 抵消单元将所述回波抵消信号与接收信号 进行叠加, 来抵消接收信号中所叠加的近端回波正交频分复用信号。
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EP11878718.3A EP2787654B1 (en) | 2011-12-31 | 2011-12-31 | Transmission method, device and system using carrier modulation |
PCT/CN2011/085202 WO2013097247A1 (zh) | 2011-12-31 | 2011-12-31 | 一种利用载波调制的传输方法、装置和*** |
CN201180002991.1A CN102726019B (zh) | 2011-12-31 | 2011-12-31 | 一种利用载波调制的传输方法、装置和*** |
US14/319,862 US20140313876A1 (en) | 2011-12-31 | 2014-06-30 | Transmission method, apparatus and system that use carrier modulation |
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PCT/CN2011/085202 WO2013097247A1 (zh) | 2011-12-31 | 2011-12-31 | 一种利用载波调制的传输方法、装置和*** |
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US14/319,862 Continuation US20140313876A1 (en) | 2011-12-31 | 2014-06-30 | Transmission method, apparatus and system that use carrier modulation |
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EP (1) | EP2787654B1 (zh) |
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CN101447965A (zh) * | 2007-11-27 | 2009-06-03 | 韩国科学技术院 | 使用多天线的回波消除和回波信道估计*** |
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- 2011-12-31 CN CN201180002991.1A patent/CN102726019B/zh not_active Expired - Fee Related
- 2011-12-31 WO PCT/CN2011/085202 patent/WO2013097247A1/zh active Application Filing
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Publication number | Publication date |
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US20140313876A1 (en) | 2014-10-23 |
CN102726019A (zh) | 2012-10-10 |
CN102726019B (zh) | 2014-07-09 |
EP2787654A1 (en) | 2014-10-08 |
EP2787654B1 (en) | 2016-04-27 |
EP2787654A4 (en) | 2015-01-14 |
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