CN114567341A - Multi-mode high-sensitivity high-speed signal receiving circuit - Google Patents
Multi-mode high-sensitivity high-speed signal receiving circuit Download PDFInfo
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Abstract
The multimode high-sensitivity high-speed signal receiving circuit disclosed by the invention can improve the communication reliability and the transmission efficiency. The invention is realized by the following technical scheme: the fixed point sampling module changes the input analog signal into a digital signal and sends the digital signal to the time delay calculation module, calculates and corrects the time delay between two paths of signals, the extraction filter module recovers a baseband digital signal and sends the baseband digital signal to the adaptive equalization module 1 for dynamic correction, the cancellation result is sent to the mode identification module, the identification result is sent to the carrier tracking module, a corresponding carrier tracking algorithm is selected for carrier tracking, the symbol tracking is sent to the symbol tracking module for symbol tracking, the symbol tracking result is sent to the adaptive equalization module 2, the blind equalization algorithm is adopted for channel equalization, the processing result is respectively sent to the variable code modulation processing path and the fixed mode code modulation processing path, automatic mode identification, unified carrier tracking, symbol tracking and decoding processing are adopted, and lossless receiving of the adaptive code modulation signal is achieved.
Description
Technical Field
The invention belongs to the field of wireless communication, and mainly relates to a multimode high-sensitivity high-speed signal receiving circuit which is particularly suitable for wireless communication occasions such as satellite communication, satellite remote sensing and the like.
Background
Satellite remote sensing is an important technical means for collecting earth data information, and has the characteristics of no national limit, wide coverage area, periodicity in observation, objective data and the like. The acquired remote sensing image data with the characteristics of high spatial resolution, high temporal resolution, high spectral resolution and high radiation resolution is subjected to basic processing and information extraction through a remote sensing image processing platform, and information and service can be provided for the application of the national economy industry. With the development of satellite remote sensing technology, the resolution of remote sensing data is rapidly improved, and therefore, the requirements on the data transmission rate and quality between a satellite and a ground receiving station are higher and higher. On one hand, limited bandwidth resources are expected to be utilized as much as possible to improve the channel capacity of the system; on the other hand, it is desirable to transmit more information at lower transmit power. A wireless communication channel is different from a wired channel, and the condition of the wireless communication channel is affected by rainfall, multipath, variation in distance between both signal transmitting and receiving sides, and the like. In order to improve the efficiency of satellite communication, conventional satellite communication usually meets the requirements of different transmission rates and transmission powers through different modulation and coding schemes. In this way, for a single transmission task, the adopted coding and modulation method often needs to reserve more system margin to ensure that normal transmission can be performed under severe link conditions such as rainfall, multipath, long distance of both signal receiving and transmitting parties, and the like. These power margins are only used occasionally and will be idle most of the time, resulting in a significant waste of system resources. In order to improve the transmission efficiency of satellite communication, in recent years, an adaptive transmission system is adopted, which adjusts the modulation and coding scheme in real time according to the change of the transmission distance between the satellite and the ground and the channel in one transmission task. The self-adaptive transmission system can transmit data more efficiently, so that limited bandwidth and power resources are fully utilized. The adaptive transmission can adjust the transmission mode in real time according to the channel quality: when the channel quality is poor, the transmission quality is ensured by reducing the modulation order, adopting a coding mode with larger coding gain and the like; when the channel quality is better, the transmission rate is improved by improving the modulation order, adopting a coding rate with higher code rate and the like. But fixed rate coding does not enable the system to operate at optimal source coding and channel coding rates. In addition, as the transmission rate of satellite communication is continuously increased, the Ka band and the phased array antenna are more and more applied, and at this time, the received signal may face stronger polarization interference, so cross polarization interference cancellation needs to be performed in the demodulation process to improve the reception quality. The traditional polarization interference cancellation algorithm has the defects of poor time delay difference adaptability to different channels, long convergence time, poor adaptability to signals with different bandwidths and the like in engineering application, and engineering application is difficult to carry out.
Disclosure of Invention
The invention aims to provide a multimode high-sensitivity high-speed signal receiving circuit which has stronger flexibility, better cancellation performance and stronger engineering applicability and can improve the communication reliability and the transmission efficiency, aiming at the problems that the lossless reception of a self-adaptive coding modulation signal of a new system cannot be adapted, the receiving effect is sensitive to the polarization interference in a transmission link, and the receiving performance is greatly influenced by the channel quality of the transmission link in the receiving process of the existing high-speed signal.
The scheme adopted by the invention for solving the problems in the prior art is as follows: a multimode, high sensitivity, high speed signal receiving circuit comprising: fixed point sampling module and the time delay calculation module, the extraction filtering module, the self-adaptation balanced module 1, the mode identification module, the carrier tracking module, the symbol tracking module, the self-adaptation balanced module 2 that establish ties in order of fixed point sampling input intermediate frequency signal to and the variable code modulation processing route and the fixed mode code modulation processing route that connect in parallel each other, its characterized in that: the fixed point sampling module samples input intermediate frequency signals and input interference signals by adopting a fixed sampling rate, converts input analog signals into digital signals and sends the digital signals to the time delay calculation module, the time delay calculation module calculates and corrects time delay between two paths of signals and then sends the two paths of data with time delay difference eliminated to the extraction filtering module, the extraction filtering module interpolates, extracts and filters the signals according to the actual signal bandwidth and the symbol rate of the actual signals to recover baseband digital signals and send the baseband digital signals to the self-adaptive equalization module 1, dynamically corrects the frequency error and the phase error of the two paths of signals, sends cancellation results to the mode identification module after eliminating polarization interference existing in the signals, the mode identification module identifies a signal modulation mode and a coding mode in real time according to known signal characteristics and sends the identification results to the carrier tracking module, the carrier tracking module selects a corresponding carrier tracking algorithm to perform carrier tracking according to the signal modulation mode and the coding mode acquired from the mode identification module, the signal after the carrier tracking is finished is sent to the symbol tracking module to perform symbol tracking, the symbol tracking result is sent to the adaptive equalization module 2, channel equalization is performed by adopting a blind equalization algorithm, signal distortion introduced in the transmission process is eliminated, the processing results are respectively sent to a variable code modulation processing path and a fixed mode code modulation processing path, and lossless receiving of the adaptive code modulation signal is realized by adopting automatic mode identification, unified carrier tracking, symbol tracking and decoding processing.
Compared with the prior art, the invention has the following beneficial effects:
the invention adopts fixed-point sampling to input the intermediate frequency signal for sampling, the sampling rate of the input signal with different bandwidths is not changed, and the sampling clock can be prevented from being changed according to different central frequencies and signal bandwidths.
The invention adopts the time delay calculation module, the extraction filtering module, the self-adaptive equalization module 1, the mode identification module, the carrier tracking module, the symbol tracking module and the self-adaptive equalization module 2 which are sequentially connected in series, and the variable coding modulation processing path and the fixed mode coding modulation processing path which are mutually connected in parallel, and can realize the unified reception of various modulation signals through unified carrier and symbol tracking, thereby greatly reducing the complexity of a high-speed signal receiving circuit and ensuring that the circuit volume is smaller.
The invention adopts a fixed sampling rate to sample an input intermediate frequency signal and an input interference signal, converts an input analog signal into a digital signal and sends the digital signal to a time delay calculation module, the time delay calculation module calculates and corrects the time delay between two paths of signals and then sends the two paths of data with the time delay difference eliminated to an extraction filtering module, and the extraction filtering module interpolates, extracts and filters the signals according to the actual signal bandwidth and the symbol rate of the actual signal to recover a baseband digital signal and send the baseband digital signal to an adaptive equalization module 1. By adopting fixed-point sampling and a flexible extraction filtering algorithm, anti-aliasing filtering of all bandwidth signals in a sampling bandwidth can be realized only by adopting a pre-filter with a fixed bandwidth, and a digital filter in a subsequent extraction filtering module can perform secondary filtering according to the signal bandwidth so as to further eliminate interference and noise outside the signal band. The processing architecture realizes the decoupling of the pre-filter and the signal bandwidth, the center frequency of the input intermediate frequency signal and the signal bandwidth can be dynamically set through parameters, and the real-time dynamic configuration of the center frequency and the bandwidth of the signal can be realized.
The invention adopts dynamic correction to the frequency error and the phase error of two paths of signals, eliminates the polarization interference existing in the signals, sending the cancellation result to a pattern recognition module, recognizing the signal modulation mode and the coding mode in real time by the pattern recognition module according to the known signal characteristics, and the recognition result is sent to a carrier tracking module, the carrier tracking module selects a corresponding carrier tracking algorithm for carrying out carrier tracking according to the signal modulation mode and the coding mode which are obtained from the mode recognition module, the signal after the carrier tracking is sent to a symbol tracking module for carrying out symbol tracking, the method can automatically complete signal mode identification aiming at the variable coding modulation signals, complete continuous tracking of different modulation coding signals by adopting a unified carrier tracking module, realize lossless reception of the variable coding modulation signals, and obtain better transmission efficiency while improving the reception stability.
The invention obviously improves the adaptive capacity to different link delays by adding delay calculation and delay correction processing before the adaptive equalization, realizes the accurate cancellation of the interference amplitude and phase by adopting the adaptive equalization processing, and has stronger engineering applicability and better cancellation performance.
The method aims at the variable coding modulation signal and the fixed mode coding modulation signal, the symbol tracking result is sent to the self-adaptive equalization module 2, the blind equalization algorithm is adopted to carry out channel equalization, the signal distortion introduced in the transmission process is eliminated, the processing result is respectively sent to the variable coding modulation processing path and the fixed mode coding modulation processing path, and the lossless receiving of the self-adaptive coding modulation signal is realized by adopting automatic mode identification, unified carrier tracking, symbol tracking and decoding processing. The resource is highly multiplexed by adopting a uniform processing circuit, and the circuit area is reduced.
Drawings
FIG. 1 is a schematic diagram of a multimode high-sensitivity high-speed signal receiving circuit according to the present invention;
the invention is further illustrated with reference to the following figures and examples.
Detailed Description
See fig. 1. In the exemplary preferred embodiment described below, a multimode, high sensitivity, high speed signal receiving circuit comprises: fixed point sampling module and the time delay calculation module, the extraction filtering module, the self-adaptation balanced module 1, the mode identification module, the carrier tracking module, the symbol tracking module, the self-adaptation balanced module 2 that establish ties in order of fixed point sampling input intermediate frequency signal to and the variable code modulation processing route and the fixed mode code modulation processing route that connect in parallel each other, its characterized in that: the fixed point sampling module samples input intermediate frequency signals and input interference signals by adopting a fixed sampling rate, converts input analog signals into digital signals and sends the digital signals to the time delay calculation module, the time delay calculation module calculates and corrects time delay between two paths of signals and then sends the two paths of data with time delay difference eliminated to the extraction filtering module, the extraction filtering module interpolates, extracts and filters the signals according to the actual signal bandwidth and the symbol rate of the actual signals to recover baseband digital signals and send the baseband digital signals to the self-adaptive equalization module 1, dynamically corrects the frequency error and the phase error of the two paths of signals, sends cancellation results to the mode identification module after eliminating polarization interference existing in the signals, the mode identification module identifies a signal modulation mode and a coding mode in real time according to known signal characteristics and sends the identification results to the carrier tracking module, the carrier tracking module selects a corresponding carrier tracking algorithm for carrier tracking according to the signal modulation mode and the coding mode acquired from the mode identification module, the signal after carrier tracking is sent to the symbol tracking module for symbol tracking, the symbol tracking result is sent to the adaptive equalization module 2, channel equalization is carried out by adopting a blind equalization algorithm, signal distortion introduced in the transmission process is eliminated, the processing results are respectively sent to the variable code modulation processing path and the fixed mode code modulation processing path, and lossless receiving of the adaptive code modulation signal is realized by adopting automatic mode identification, unified carrier tracking, symbol tracking and decoding processing.
And the variable coding modulation processing path sequentially carries out physical frame synchronization, data preprocessing, decoding, data frame synchronization, descrambling and data framing on the data through a physical frame synchronization module, a data preprocessing module, a decoding module, a data frame synchronization module, a descrambling module and a data framing module which are sequentially connected in series, and then outputs the sent original data and corresponding data identification.
And the fixed mode coding modulation processing path sequentially and serially connects a data frame synchronization module, a data preprocessing module, a decoding module, a descrambling module and a data framing module in sequence to perform data frame synchronization, data preprocessing, decoding, descrambling and data framing on the data and then output the transmitted original data and corresponding data identification.
In the processing process, the time delay calculation module calculates the time delay difference between the input intermediate frequency signal and the input interference signal of the fixed point sampling module in real time, and compensates the time delay difference between the two paths of signals of the input intermediate frequency signal and the input interference signal according to the calculation result.
In the processing process, the digital filter in the extraction filtering module performs secondary filtering according to the signal bandwidth to realize decoupling of the pre-filter and the signal bandwidth, the adaptive equalization module 1 dynamically sets the center frequency and the signal bandwidth of the input intermediate frequency signal in real time by taking the signal quality after symbol tracking as a reference standard, performs adaptive equalization on the signal after extraction filtering of the extraction filtering module in two dimensions of amplitude and phase, and eliminates polarization interference existing in the signal.
In the above processing procedure, the pattern recognition module recognizes the signal modulation mode and the coding mode by comparing the signal waveform characteristic template stored in advance locally with the received signal. The mode identification module is only used when processing the variable code modulation signal and is used for acquiring the signal modulation mode and the coding mode, and when the received signal is the fixed code modulation signal, the signal modulation mode and the coding mode are known and do not need to be identified. When the mode identification module processes the variable coding modulation signal, the signal modulation mode and the coding mode are obtained in real time according to the known signal characteristics, the signal modulation mode and the coding mode are identified through the comparison between a signal waveform characteristic template stored in advance locally and a received signal, the identification result is sent to the carrier tracking module, the carrier tracking module selects a corresponding carrier tracking algorithm from the signal modulation mode and the coding mode obtained by the mode identification module to perform carrier tracking, and the signal after the carrier tracking is sent to the symbol tracking module to perform symbol tracking.
In the processing process, the carrier tracking module and the symbol tracking module adopt a unified processing framework to realize the carrier tracking and the symbol tracking of the received signal, when the modulation mode of the signal is switched, the carrier tracking and the symbol tracking parameters are dynamically modified according to the modulation mode obtained from the mode identification module, so that the continuous tracking of the received signal can be realized, and the continuity of the tracking process when the modulation mode and the coding mode are switched is ensured.
When the type of the received signal is a variable code modulation signal, the processing result of the self-adaptive equalization module 2 is sent to a physical frame synchronization module, the physical frame synchronization module selects a corresponding physical frame leader and a physical frame length according to the mode identification result of the mode identification module, frame leader detection is carried out in a mode related to the frame leader, a physical frame leader indication signal is generated when the frame leader is detected, the physical frame leader indication signal is sent to a data preprocessing module, the data preprocessing module carries out pilot frequency and symbol descrambling on the data according to the mode identification result of the mode identification module and then sends the data to a decoding module, the decoding module decodes the data according to the mode identification result of the mode identification module, the data is sent to a data frame synchronization module, the data frame synchronization module carries out frame synchronization processing on the data according to a preset frame synchronization word and frame length and then sends the data to a descrambling module, and the data framing module frames the data according to an agreed data format and outputs the transmitted original data and a corresponding data identifier.
When the type of the received signal is a fixed mode coded modulation signal, the processing result of the self-adaptive equalization module 2 is sent to a data frame synchronization module, the data frame synchronization module carries out frame synchronization processing on the data according to a preset frame synchronization word and a preset frame length and then sends the data to a second data preprocessing module for preprocessing, descrambling and deinterleaving processing are carried out according to preset parameters and then sends the data to a decoding module, the decoding module decodes the data according to a preset decoding mode, the decoding result is sent to a descrambling module, the descrambling module carries out descrambling according to a preset descrambling polynomial and a descrambling initial relative data and then sends the data to a data framing module, and the data framing module frames the data according to a preset data format and then outputs the sent original data and a corresponding data identifier.
The scope of the invention is not limited to the specific embodiments described. Various modifications to these embodiments described above will be readily apparent to those skilled in the art. The general principles defined by the present invention may be implemented in other embodiments without departing from the spirit or scope of the invention. Any technical solution obtained by performing the same or equivalent replacement on technical elements in the described specific technical solution or technical solution obtained by a person skilled in the art without creative work on the basis of the described specific technical solution should be considered to fall within the protection scope of the present invention.
Claims (9)
1. A multimode, high sensitivity, high speed signal receiving circuit comprising: fixed point sampling module and the time delay calculation module, the extraction filtering module, the self-adaptation balanced module 1, the mode identification module, the carrier tracking module, the symbol tracking module, the self-adaptation balanced module 2 that establish ties in order of fixed point sampling input intermediate frequency signal to and the variable code modulation processing route and the fixed mode code modulation processing route that connect in parallel each other, its characterized in that: the fixed point sampling module samples input intermediate frequency signals and input interference signals by adopting a fixed sampling rate, converts input analog signals into digital signals and sends the digital signals to the time delay calculation module, the time delay calculation module calculates and corrects time delay between two paths of signals, then sends two paths of data with time delay difference eliminated to the extraction filtering module, the extraction filtering module interpolates, extracts and filters the signals according to the actual signal bandwidth and the symbol rate of the actual signals to recover baseband digital signals and sends the baseband digital signals to the self-adaptive equalization module 1, dynamically corrects the frequency error and the phase error of the two paths of signals, sends a cancellation result to the mode identification module after eliminating polarization interference in the signals, the mode identification module identifies a signal modulation mode and a coding mode in real time according to known signal characteristics and sends the identification result to the carrier tracking module, the carrier tracking module selects a corresponding carrier tracking algorithm to perform carrier tracking according to the signal modulation mode and the coding mode acquired from the mode identification module, the signal after the carrier tracking is finished is sent to the symbol tracking module to perform symbol tracking, the symbol tracking result is sent to the adaptive equalization module 2, channel equalization is performed by adopting a blind equalization algorithm, signal distortion introduced in the transmission process is eliminated, the processing results are respectively sent to a variable code modulation processing path and a fixed mode code modulation processing path, and lossless receiving of the adaptive code modulation signal is realized by adopting automatic mode identification, unified carrier tracking, symbol tracking and decoding processing.
2. The method of claim 1 wherein the multimode high sensitivity high speed signal receiving method comprises: and the variable coding modulation processing path sequentially carries out physical frame synchronization, data preprocessing, decoding, data frame synchronization, descrambling and data framing on the data through a physical frame synchronization module, a data preprocessing module, a decoding module, a data frame synchronization module, a descrambling module and a data framing module which are sequentially connected in series, and then outputs the sent original data and corresponding data identification.
3. The method of claim 1 wherein the multimode high sensitivity high speed signal receiving method comprises: and the fixed mode coding modulation processing path sequentially and serially connects a data frame synchronization module, a data preprocessing module, a decoding module, a descrambling module and a data framing module in sequence to perform data frame synchronization, data preprocessing, decoding, descrambling and data framing on the data and then output the transmitted original data and corresponding data identification.
4. The method of claim 1 wherein the multimode high sensitivity high speed signal receiving method comprises: and the time delay calculation module calculates the time delay difference between the input intermediate frequency signal and the input interference signal of the fixed point sampling module in real time, and compensates the time delay difference of the two paths of signals of the input intermediate frequency signal and the input interference signal according to the calculation result.
5. A method of receiving a multimode high sensitivity high speed signal as claimed in claim 1, characterized in that: the digital filter in the extraction filtering module performs secondary filtering according to the signal bandwidth to achieve decoupling of the pre-filter and the signal bandwidth, the adaptive equalization module 1 dynamically sets the center frequency and the signal bandwidth of an input intermediate frequency signal in real time by taking the signal quality after symbol tracking as a reference standard, performs adaptive equalization on the signal after extraction filtering of the extraction filtering module in two dimensions of amplitude and phase, and eliminates polarization interference existing in the signal.
6. A method of receiving a multimode high sensitivity high speed signal as claimed in claim 1, characterized in that: when the mode identification module processes the variable coding modulation signal, the signal modulation mode and the coding mode are obtained in real time according to the known signal characteristics, the signal modulation mode and the coding mode are identified through the comparison between a signal waveform characteristic template stored in advance locally and a received signal, the identification result is sent to the carrier tracking module, the carrier tracking module selects a corresponding carrier tracking algorithm from the signal modulation mode and the coding mode obtained by the mode identification module to perform carrier tracking, and the signal after the carrier tracking is sent to the symbol tracking module to perform symbol tracking.
7. The method of claim 1 wherein the multimode high sensitivity high speed signal receiving method comprises: the carrier tracking module and the symbol tracking module adopt a unified processing architecture to realize the carrier tracking and the symbol tracking of the received signal, and dynamically modify the carrier tracking and the symbol tracking parameters according to the modulation mode obtained from the mode identification module when the signal modulation mode is switched, thereby realizing the continuous tracking of the received signal and ensuring the continuity of the tracking process when the modulation mode and the coding mode are switched.
8. The method of claim 1 wherein the multimode high sensitivity high speed signal receiving method comprises: in the variable code modulation processing path, when the type of the received signal is a variable code modulation signal, the processing result of the adaptive equalization module 2 is sent to a physical frame synchronization module, the physical frame synchronization module selects a corresponding physical frame leader and a physical frame length according to the mode identification result of the mode identification module, frame leader detection is carried out in a mode related to the frame leader, a physical frame leader indication signal is generated when the frame leader is detected, the physical frame leader indication signal is sent to a data preprocessing module for preprocessing, pilot frequency and symbol descrambling is carried out on the data according to the mode identification result of the mode identification module, the data is sent to a decoding module, the decoding module selects a corresponding decoding mode according to the mode identification result of the mode identification module, the data is sent to a data frame synchronization module after being decoded, the data frame synchronization module carries out frame synchronization processing on the data according to a preset frame synchronization word and a preset frame length and then sends the data to the descrambling module, and the data framing module frames the data according to an agreed data format and outputs the transmitted original data and a corresponding data identifier.
9. The method of claim 1 wherein the multimode high sensitivity high speed signal receiving method comprises: in the fixed mode code modulation processing path, when the type of the received signal is a fixed mode code modulation signal, after the processing result of the adaptive equalization module 2 is sent to a data frame synchronization module, the data frame synchronization module performs frame synchronization processing on data according to a preset frame synchronization word and a preset frame length and then sends the data to a second data preprocessing module for preprocessing, the data preprocessing module performs descrambling and deinterleaving processing according to preset parameters and then sends the data to a decoding module, the decoding module decodes the data according to a preset decoding mode, the decoding result is sent to a descrambling module, the descrambling module performs descrambling according to a preset descrambling polynomial and descrambling initial relative data and then sends the data to a data framing module, and the data framing module frames the data and then outputs the sent original data and corresponding data identification.
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