CN112187338A - Two-stage processing interference cancellation system and method for asynchronous CDMA system - Google Patents
Two-stage processing interference cancellation system and method for asynchronous CDMA system Download PDFInfo
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Abstract
The invention discloses a two-stage processing interference cancellation system for an asynchronous code division multiple access system, which belongs to the technical field of signal processing and comprises a beam synthesis module, a spread spectrum code capturing module, a multi-channel high-power signal demodulator module, a signal regeneration reconstruction module, a delay module, a multi-target interference cancellation module, a multi-channel low-power signal demodulator module and a channel decoding module. The invention can improve the capacity of the asynchronous code division multiple access system, reduce the complexity of hardware realization and is easy to realize engineering; the problem that the high-power signal in the asynchronous code division multiple access system suppresses the low-power signal to enable the low-power signal not to be captured and demodulated can be solved, the performance of the asynchronous code division multiple access system is improved, and the asynchronous code division multiple access system is worthy of being popularized and used.
Description
Technical Field
The invention relates to the technical field of signal processing, in particular to a two-stage processing interference cancellation system and a two-stage processing interference cancellation method for an asynchronous code division multiple access system.
Background
In a cdma system, there is a certain correlation between the signals of each user, which is the root cause of the existence of Multiple Access Interference (MAI). Compared with ground communication, the satellite communication system can not realize closed-loop power control generally due to the fact that link transmission time delay in satellite communication is large, the speed between users is different, power is unequal, and therefore the near-far effect is generated, and multiple access interference is serious.
With the increase of the number of low orbit spacecrafts, a plurality of users exist in a wave beam in the future, and the traditional detection technology directly and respectively carries out spread spectrum code matching processing on signals of each user completely according to a direct spread spectrum sequence theory, so that the anti-MAI capability is poor. When the dynamic range of the user level is large, the high-power signal suppresses the low-power signal so that the low-power signal cannot be captured and detected. The above problems are urgently needed to be solved. To this end, a two-stage processing interference cancellation system for an asynchronous code division multiple access system is proposed.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the problem that the low-power signal can not be captured, demodulated and decoded by the low-power signal because the low-power signal is suppressed by the high-power signal in the asynchronous code division multiple access system is solved, and the two-stage processing interference cancellation system for the asynchronous code division multiple access system is provided.
The invention solves the technical problem through the following technical scheme, and the device comprises a beam synthesis module, a spread spectrum code capturing module, a multi-channel high-power signal demodulator module, a signal regeneration reconstruction module, a delay module, a multi-target interference cancellation module, a multi-channel low-power signal demodulator module and a channel decoding module;
the beam synthesis module is used for weighting the input multi-channel baseband array signals and carrying out digital beam synthesis;
the spread spectrum code capturing module is used for capturing signals and finding out the initial time of a data code phase;
the multi-channel high-power signal demodulator module is used for demodulating spread spectrum signals of a plurality of high-power users at the same time;
the signal regeneration reconstruction module is used for reconstructing and regenerating the high-power interference signal;
the delay module is used for delaying the original baseband array signal input into the multi-channel high-power signal demodulator module;
the multi-target interference cancellation module is used for deducting the regenerated high-power interference signals from the baseband array signals after the original beam synthesis;
the multi-channel low-power signal demodulator module is used for demodulating spread spectrum signals of a plurality of low-power users at the same time;
the channel decoding module is used for decoding the spread spectrum signal of the demodulated low-power user and outputting data before encoding;
the beam synthesis module, the multi-channel high-power signal demodulator module, the signal regeneration reconstruction module, the multi-target interference cancellation module, the multi-channel low-power signal demodulator module and the channel decoding module are sequentially connected, the spread spectrum code capturing module is connected with the multi-channel high-power signal demodulator module, and the delay module is respectively connected with the beam synthesis module and the multi-target interference cancellation module.
Furthermore, the spread spectrum code capturing module uses the cross-correlation characteristic of Gold sequence to construct a composite code as a local pseudo code, and performs parallel search on a code phase-carrier frequency offset two-dimensional plane to determine the code phase and the carrier frequency offset between a received signal and the local pseudo code, specifically, the local code is set to be different in code phase and carrier frequency offset to correlate with the received signal, when a peak value occurs in a correlation value between the local code and the received signal under the setting of a certain group of code phase and carrier frequency offset, that is, the group is set as a code capturing result, so that one spread spectrum code capturing module can detect the existence of signals of multiple users in parallel.
Furthermore, the spread spectrum code capturing module comprises a matched filter, wherein the matched filter is a two-dimensional matched filter and is used for searching in the time domain and the frequency domain simultaneously, and the capability of capturing and searching in parallel is improved.
Furthermore, the multi-channel high-power signal demodulator and the multi-channel low-power signal demodulator have the same structure and respectively comprise a carrier and code dynamic counteracting module, a despreading integral module and a synchronous loop, wherein the carrier and code dynamic counteracting module is connected with the beam synthesis module, the carrier and code dynamic counteracting module, the despreading integral module and the synchronous loop are sequentially connected, and the synchronous loop is connected with the signal regeneration reconstruction module.
Furthermore, the carrier and code dynamic counteracting module carries out carrier and PN code Doppler compensation on the input baseband signal to counteract the carrier frequency and PN code rate dynamics in the baseband signal; the despreading and integrating module strips off PN codes in the received baseband signals and performs integration operation on the despread baseband signals by taking a symbol period before channel decoding as an interval; and the synchronous loop outputs synchronous information to the carrier and code dynamic counteracting module to form a closed loop, and simultaneously outputs synchronous information to the signal regeneration reconstruction module to regenerate high-power interference signals.
Furthermore, the signal regeneration reconstruction module comprises a plurality of channel parallel signal regeneration units, and the signal regeneration units are used for reconstructing and regenerating the high-power interference signals by using a multi-user detection technology according to the synchronization information and the symbol decision value output by the multi-channel high-power signal demodulator module.
Furthermore, in the delay module, the delay amount of the original baseband array signal input into the multi-channel high-power signal demodulator module is the sum of the processing delay and the signal regeneration delay of the multi-channel high-power signal demodulator module.
Furthermore, the multi-target interference cancellation module comprises a multi-path adder and a subtracter, wherein the output end of the multi-path adder is connected with the input end of the subtracter, the input end of the multi-path adder is respectively connected with each signal regeneration unit, and the output end of the subtracter is connected with the carrier and code dynamic cancellation module in the multi-channel low-power signal demodulator.
Furthermore, the input end of the subtracter is connected with the delay module.
The invention also provides a two-stage processing interference cancellation method for the asynchronous code division multiple access system, which comprises the following steps:
s1: capturing and demodulating the high-power signal to recover the high-power signal;
s2: deducting the high-power signal from the primary beam synthesis signal;
s3: and carrying out demodulation and decoding processing on the low-power signal.
Compared with the prior art, the invention has the following advantages: the asynchronous CDMA system uses a two-stage processing interference cancellation system, can improve the capacity of the asynchronous CDMA system, reduce the complexity of hardware realization, and is easy to realize in engineering; the problem that the high-power signal in the asynchronous code division multiple access system suppresses the low-power signal to enable the low-power signal not to be captured and demodulated can be solved, the performance of the asynchronous code division multiple access system is improved, and the asynchronous code division multiple access system is worthy of being popularized and used.
Drawings
Fig. 1 is a schematic flow chart of two-stage interference cancellation according to an embodiment of the present invention;
fig. 2 is a schematic block diagram of a two-stage processing interference cancellation system according to a second embodiment of the present invention;
fig. 3 is a schematic block diagram of a spreading code acquisition module according to a second embodiment of the present invention;
FIG. 4 is a block diagram showing the structure of two multi-channel demodulator modules according to the second embodiment of the present invention;
FIG. 5 is a block diagram schematically illustrating a signal regeneration reconfiguration module according to a second embodiment of the present invention;
fig. 6 is a schematic block diagram of a structure of a multi-target interference cancellation module in the second embodiment of the present invention.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
Example one
The embodiment provides a technical scheme: a two-stage processing interference cancellation system for an asynchronous code division multiple access system comprises a beam synthesis module, a spread spectrum code capturing module, a multi-channel high-power signal demodulator module, a signal regeneration reconstruction module, a delay module, a multi-target interference cancellation module, a multi-channel low-power signal demodulator module and a channel decoding module;
the beam synthesis module is used for weighting the input multi-channel baseband array signals and carrying out digital beam synthesis;
the spread spectrum code capturing module is used for capturing signals and finding out the initial time of a data code phase;
the multi-channel high-power signal demodulator module is used for demodulating spread spectrum signals of a plurality of high-power users at the same time;
the signal regeneration reconstruction module is used for reconstructing and regenerating the high-power interference signal;
the delay module is used for delaying the original baseband array signal input into the multi-channel high-power signal demodulator module;
the multi-target interference cancellation module is used for deducting the regenerated high-power interference signals from the baseband array signals after the original beam synthesis;
the multi-channel low-power signal demodulator module is used for demodulating spread spectrum signals of a plurality of low-power users at the same time;
the channel decoding module is used for decoding the spread spectrum signal of the demodulated low-power user and outputting data before encoding;
the beam synthesis module, the multi-channel high-power signal demodulator module, the signal regeneration reconstruction module, the multi-target interference cancellation module, the multi-channel low-power signal demodulator module and the channel decoding module are sequentially connected, the spread spectrum code capturing module is connected with the multi-channel high-power signal demodulator module, and the delay module is respectively connected with the beam synthesis module and the multi-target interference cancellation module.
The spread spectrum code capturing module utilizes the cross-correlation characteristic of Gold sequence to construct a composite code as a local pseudo code, and carries out parallel search on a code phase-carrier frequency offset two-dimensional plane to judge the code phase and the carrier frequency offset between a received signal and the local pseudo code.
The spread spectrum code capturing module comprises a matched filter, wherein the matched filter is a two-dimensional matched filter and is used for searching in a time domain and a frequency domain simultaneously, and the capability of capturing and searching in parallel is improved.
The multi-channel high-power signal demodulator and the multi-channel low-power signal demodulator are identical in structure and respectively comprise a carrier and code dynamic counteracting module, a despreading integral module and a synchronous loop, the carrier and code dynamic counteracting module is connected with the beam forming module, the carrier and code dynamic counteracting module, the despreading integral module and the synchronous loop are sequentially connected, and the synchronous loop is connected with the signal regeneration reconstruction module.
The carrier and code dynamic counteracting module carries out carrier and PN code Doppler compensation on the input baseband signal to counteract the carrier frequency and PN code rate dynamics in the baseband signal; the despreading and integrating module strips off PN codes in the received baseband signals and performs integration operation on the despread baseband signals by taking a symbol period before channel decoding as an interval; and the synchronous loop outputs synchronous information to the carrier and code dynamic counteracting module to form a closed loop, and simultaneously outputs synchronous information to the signal regeneration reconstruction module to regenerate high-power interference signals.
The signal regeneration reconstruction module comprises a plurality of parallel-channel signal regeneration units, and the signal regeneration units are used for reconstructing and regenerating high-power interference signals by using a multi-user detection technology according to the synchronization information and the symbol decision value output by the multi-channel high-power signal demodulator module.
In the delay module, the delay amount of the original baseband array signal input into the multi-channel high-power signal demodulator module is the sum of the processing delay and the signal regeneration delay of the multi-channel high-power signal demodulator module.
The multi-target interference cancellation module comprises a multi-path adder and a subtracter, wherein the output end of the multi-path adder is connected with the input end of the subtracter, the input end of the multi-path adder is respectively connected with each signal regeneration unit, and the output end of the subtracter is connected with the carrier and code dynamic cancellation module in the multi-channel low-power signal demodulator.
And the input end of the subtracter is connected with the delay module.
As shown in fig. 1, this embodiment further provides a two-stage processing interference cancellation method for an asynchronous cdma system, which includes the following steps:
s1: capturing and demodulating the high-power signal to recover the high-power signal;
s2: deducting the high-power signal from the primary beam synthesis signal;
s3: and carrying out demodulation and decoding processing on the low-power signal.
Example two
As shown in fig. 2, the present embodiment provides a technical solution: a two-stage processing interference cancellation system for an asynchronous code division multiple access system adopts a two-stage processing scheme, wherein the first-stage processing comprises the steps of firstly capturing and demodulating a high-power signal, then recovering the high-power signal by using a signal regeneration and reconstruction module, deducting the high-power signal from an original beam-synthesized signal, and then demodulating and decoding the obtained low-power signal.
The following describes the information related to each module
A beam synthesis module: the system is used for weighting the input multi-channel baseband array signals and carrying out digital beam synthesis;
as shown in fig. 3, the spreading code acquisition module: the initial time of the PN code in the received data (i.e., the received data code phase) is found, so that the subsequent multi-channel high-power signal demodulator module can start to operate in the state of initial alignment of the local PN code. The method uses the cross-correlation characteristic of Gold sequence to construct a composite code as a local pseudo code, and carries out parallel search on a code phase-carrier frequency offset two-dimensional plane to judge the code phase and the carrier frequency offset between a received signal and the local pseudo code, specifically, the local code is set into different code phases and carrier frequency offsets to be correlated with the received signal, when the correlation value of the local code and the received signal has a peak value under the setting of a certain group of code phases and carrier frequency offsets, the group is set as the result of code capture, thereby the signal existence of a plurality of users can be detected in parallel only by using a spread spectrum code capture module, the user signal with larger power can be detected rapidly under the smaller resource consumption, and the multi-address interference detection and cancellation algorithm can be realized on a hardware platform with limited processing capability. However, the speed of code capture is inevitably influenced by the fact that a plurality of receiving channels share the same spread spectrum code capture module, the factor is considered during design, a two-dimensional matched filter capable of searching in the time domain and the frequency domain simultaneously is used, the parallel search capability of code capture is improved, and the time of code capture is obviously shortened under the acceptable hardware consumption.
As shown in fig. 4, the multi-channel high-power signal demodulator module: the spread spectrum signals of a plurality of high-power users are demodulated at the same time, and the demodulation device consists of a carrier and code dynamic counteracting module, a de-spreading integral module and a synchronous loop. The carrier and code dynamic counteracting module carries out carrier and PN code Doppler compensation on the input baseband signal to counteract the carrier frequency and the PN code rate in the baseband signal; the despreading and integrating module is used for stripping PN codes in the received baseband signals and carrying out integration operation on the despread baseband signals by taking the symbol period before channel decoding as an interval; the synchronous loop comprises a carrier synchronous loop, a PN code synchronous loop, a symbol synchronous loop and other synchronous tracking loops, synchronous information output by the synchronous loop is fed back to the carrier and code dynamic counteracting module to form a closed loop, and synchronous information needs to be transmitted to the signal regeneration reconstruction module in real time to regenerate a high-power interference signal.
As shown in fig. 5, the signal regeneration reconstruction module: the signal regeneration unit reconstructs and regenerates the high-power interference signal by using a multi-user detection (MUD) technology according to the synchronization information and the symbol decision value output by the multi-channel high-power signal demodulator module. The signal regeneration reconstruction module comprises a plurality of channels of signal regeneration units and can complete the regeneration of a plurality of high-power interference signals in parallel.
A delay module: and delaying the baseband array signal input by the original multi-channel high-power signal demodulator module to ensure that the delayed signal is consistent with the time delay of the regenerated signal, wherein the delay of the signal is the sum of the processing time delay of the multi-channel high-power signal demodulator module and the time delay of the signal regeneration.
As shown in fig. 6, the multi-target interference cancellation module: and subtracting the regenerated high-power interference signal from the baseband array signal after the primary beam synthesis. According to simulation analysis, the bit error rate loss caused by the multi-access interference of the low-power users to the high-power users can be ignored, and the interference of the high-power signals to the low-power signals is only considered to be offset, so that the simplest multi-target interference offset module can be realized only by one multi-path adder and one subtracter, and the hardware realization complexity is greatly reduced.
As shown in fig. 4, the multi-channel low-power signal demodulator module: the input is a base band array signal after beam synthesis after deducting the high-power interference signal, a plurality of low-power user spread spectrum signals can be simultaneously demodulated, and the structure of the multi-channel high-power signal demodulator module is the same as that of a multi-channel high-power signal demodulator module.
In the channel decoding module: and decoding the demodulated low-power user signal by adopting a decoding mode specified by a transmission system, and outputting data before encoding.
In summary, the asynchronous cdma system of the present embodiment uses a two-stage processing interference cancellation system, which can improve the capacity of the asynchronous cdma system, reduce the hardware implementation complexity, and facilitate the engineering implementation; the problem that the high-power signal in the asynchronous code division multiple access system suppresses the low-power signal to enable the low-power signal not to be captured and demodulated can be solved, the performance of the asynchronous code division multiple access system is improved, and the asynchronous code division multiple access system is worthy of being popularized and used.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
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