WO2017091946A1 - 一种信号处理系统、方法及装置 - Google Patents

一种信号处理系统、方法及装置 Download PDF

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Publication number
WO2017091946A1
WO2017091946A1 PCT/CN2015/095988 CN2015095988W WO2017091946A1 WO 2017091946 A1 WO2017091946 A1 WO 2017091946A1 CN 2015095988 W CN2015095988 W CN 2015095988W WO 2017091946 A1 WO2017091946 A1 WO 2017091946A1
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Prior art keywords
information
signal
sequence
soft value
phase
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PCT/CN2015/095988
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English (en)
French (fr)
Inventor
刘玲
肖治宇
李良川
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP15909463.0A priority Critical patent/EP3373536A4/en
Priority to CN201580084610.7A priority patent/CN108353045B/zh
Priority to PCT/CN2015/095988 priority patent/WO2017091946A1/zh
Publication of WO2017091946A1 publication Critical patent/WO2017091946A1/zh
Priority to US15/991,912 priority patent/US10616015B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03178—Arrangements involving sequence estimation techniques
    • H04L25/03248—Arrangements for operating in conjunction with other apparatus
    • H04L25/03273—Arrangements for operating in conjunction with other apparatus with carrier recovery circuitry
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/01—Equalisers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/03—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/29—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes combining two or more codes or code structures, e.g. product codes, generalised product codes, concatenated codes, inner and outer codes
    • H03M13/2957—Turbo codes and decoding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0041—Arrangements at the transmitter end
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0045—Arrangements at the receiver end
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03178—Arrangements involving sequence estimation techniques
    • H04L25/03248—Arrangements for operating in conjunction with other apparatus
    • H04L25/03286—Arrangements for operating in conjunction with other apparatus with channel-decoding circuitry
    • 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
    • H04L25/06—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection
    • H04L25/067—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection providing soft decisions, i.e. decisions together with an estimate of reliability

Definitions

  • the present invention relates to the field of communications, and in particular, to a signal processing system, method and apparatus.
  • Spectrum Effectiveness is the ratio of the net bit rate, or the maximum throughput, to the bandwidth of a communication channel or data link, which is a key indicator of communication system design. The higher the spectral efficiency, the higher the communication rate, user capacity, etc., thereby improving the performance of the entire communication system.
  • the sequence detector can perform sequence detection on the signal output by the post filter to resist inter-symbol interference introduced when the post filter filters the signal, so that each sequence symbol in the signal is correctly recovered, and
  • the corresponding sequence detection soft value information is output to the FEC, and the FEC performs error test on the sequence detection soft value information to restore the original signal.
  • the soft value information can be exchanged between the sequence detector and the FEC in a turbo iterative manner to improve system performance.
  • the FEC can feed back the corresponding error test soft value information to the sequence detector, so that the sequence detector can further detect the signal output by the post filter according to the error test soft value information of the FEC feedback, and output a new signal.
  • the sequence detection soft value information is sent to the FEC, and the FEC performs error checking on the new sequence detection soft value information according to the previous error test soft value information to more accurately recover the original signal.
  • the soft value information may refer to the probability that each sequence symbol in the signal is a set symbol (such as 0 or 1, etc.)
  • the information, and/or each sequence symbol is information such as a probability ratio of the set different symbols (such as a ratio of a probability of 0 to a probability of 1).
  • the received signal can usually be greatly damaged, which can be manifested by the degradation of the equalizer output signal quality.
  • a large number of cycles are introduced, and the generated error signal is transmitted to the post filter, so that the quality of the post filter input signal is degraded.
  • the input of the turbo iteration comes from the output of the post filter. If the quality of the post filter input signal deteriorates, the iterative between sequence detection and FEC will not or can not improve the quality of the input signal. As a result, the turbo iterative compensation capability is limited, which in turn makes the overall system performance improvement limited.
  • Embodiments of the present invention provide a signal processing system, method, and apparatus for solving the performance of a communication system by using an existing turbo iterative method, which cannot or cannot improve the input signal quality of the post filter, so that the whole A problem with limited system performance improvements.
  • a signal processing system comprising:
  • phase recovery device configured to receive a signal output by the equalizer and a feedback signal fed back by the information iteration device, and perform phase recovery on the signal output by the equalizer according to the feedback signal, and output the phase restored signal to the post filter device ;
  • a post-filtering device configured to perform noise filtering on the phase-recovered signal output by the phase recovery device, and output the noise-filtered signal to the information iterative device;
  • an information iterative device configured to perform sequence detection and error detection on the noise filtered signal output by the post filtering device to recover the original signal by using an iterative manner of the soft value information, and obtain the sequence detection
  • the sequence detection information and/or the error detection information obtained when the error detection is performed is fed back to the phase recovery device as a feedback signal.
  • the phase recovery device is configured to: according to the received feedback signal, extract a phase offset of a signal output by the equalizer, and Calculating an average value of the phase offsets to obtain phase offset data, and performing phase recovery on the signals output by the equalizer according to the phase offset data.
  • the sequence detection information is sequence detection soft value information and/or sequence detection hard decision information
  • the error detection information is error detection soft value information and/or error detection hard decision information; wherein the soft value information is used to reflect the probability that each sequence symbol in the signal is a set symbol, and/or is used to reflect Each sequence symbol in the signal is information indicating a ratio of probabilities of different symbols; the hard decision information is information for reflecting a specific value of each sequence symbol in the signal.
  • the information iteration apparatus includes a sequence detection device and an FEC device:
  • the sequence detecting device is configured to receive error test soft value information fed back by the FEC device, and perform sequence detection on the noise filtered signal output by the post filter device according to the error check soft value information, and output the sequence Detecting the soft value information to the FEC device, and using the sequence detection soft value information and/or the sequence detection hard decision information obtained by performing sequence detection on the noise filtered signal output by the post filtering device as a feedback signal Feedback to the phase recovery device;
  • the FEC device is configured to perform error checking on the sequence detection soft value information output by the sequence detecting device to recover an original signal, and feed back error test soft value information to the sequence detecting device.
  • the information iteration apparatus includes a sequence detection device and an FEC device:
  • the sequence detecting device is configured to receive error test soft value information fed back by the FEC device, and perform sequence detection on the noise filtered signal output by the post filter device according to the error check soft value information, and output the sequence Detect soft value information to the FEC device;
  • the FEC device is configured to perform error checking on the sequence detection soft value information output by the sequence detecting device to recover an original signal, and feed back error test soft value information to the sequence detection. And the error check hard decision information obtained by performing error checking on the error check soft value information and/or the sequence detection soft value information output by the sequence detecting device is fed back to the phase recovery as a feedback signal Device.
  • the information iteration device includes a sequence detection device and an FEC device:
  • the sequence detecting device is configured to receive error test soft value information fed back by the FEC device, and perform sequence detection on the noise filtered signal output by the post filter device according to the error check soft value information, and output the sequence Detecting the soft value information to the FEC device, and using the sequence detection soft value information and/or the sequence detection hard decision information obtained by performing sequence detection on the noise filtered signal output by the post filtering device as a feedback signal Feedback to the phase recovery device;
  • the FEC device is configured to perform error checking on the sequence detection soft value information output by the sequence detecting device to recover an original signal, and feed back error test soft value information to the sequence detecting device, and The error check soft value information and/or the error check hard decision information obtained by performing error checking on the sequence detection soft value information output by the sequence detecting device is fed back to the phase recovery device as a feedback signal.
  • the information iteration device feeds the feedback signal to the phase recovery device for a number of times not greater than The number of times the information iteration device performs the iteration of the soft value information.
  • a signal processing method comprising:
  • the phase recovery device receives the signal output by the equalizer and the feedback signal fed back by the information iterator;
  • the feedback signal is a manner in which the information iterative device performs sequence detection and error detection on the noise filtered signal output by the post filtering device by means of iterative manner of the soft value information, and the obtained sequence detection information and / or error detection information.
  • the phase output of the signal output by the equalizer is performed according to the feedback signal, including:
  • the sequence detection information is sequence detection soft value information and/or sequence detection hard decision information
  • the error detection information is error detection soft value information and/or error detection hard decision information
  • the soft value information is used to reflect the probability that each sequence symbol in the signal is a set symbol, and/or is used to reflect the signal.
  • Each of the sequence symbols is information for setting a ratio of probabilities of different symbols; the hard decision information is information for reflecting a specific value of each sequence symbol in the signal.
  • the information iteration device feeds the feedback signal to the phase recovery device for a number of times not greater than The number of times the information iteration device performs the iteration of the soft value information.
  • a phase recovery device comprising:
  • a receiving module configured to receive a signal output by the equalizer and a feedback signal fed back by the information iterative device
  • phase recovery module configured to perform phase recovery on the signal output by the equalizer according to the feedback signal
  • An output module configured to output a phase-recovered signal to the post-filtering device, to perform noise filtering on the phase-recovered signal by the post-filtering device, and output the noise-filtered signal to the information iterative device ;
  • the feedback signal is a manner in which the information iterative device performs sequence detection and error detection on the noise filtered signal output by the post filtering device by means of iterative manner of the soft value information, and the obtained sequence detection information and / or error detection information.
  • the phase recovery module is configured to: extract, according to the received feedback signal, a phase of a signal output by the equalizer And shifting an average value of the phase offset to obtain phase offset data, and performing phase recovery on the signal output by the equalizer according to the phase offset data.
  • the sequence detection information is sequence detection soft value information and/or sequence detection hard decision information
  • the error detection information is error detection soft value information and/or error detection hard decision information
  • the soft value information is used to reflect the probability that each sequence symbol in the signal is a set symbol, and/or is used to reflect the signal.
  • Each of the sequence symbols is information for setting a ratio of probabilities of different symbols; the hard decision information is information for reflecting a specific value of each sequence symbol in the signal.
  • the information that the information iteration device feeds back the feedback signal to the phase recovery device is not greater than The number of times the information iteration device performs the iteration of the soft value information.
  • a phase recovery device comprising:
  • a receiver for receiving a signal output by the equalizer and a feedback signal fed back by the information iterative device
  • a processor configured to perform phase recovery on the signal output by the equalizer according to the feedback signal received by the receiver
  • a transmitter configured to output a phase-recovered signal to the post-filtering device, to perform noise filtering on the phase-recovered signal by the post-filtering device, and output the noise-filtered signal to the information iterative device ;
  • the feedback signal is a manner in which the information iterative device performs sequence detection and error detection on the noise filtered signal output by the post filtering device by means of iterative manner of the soft value information, and the obtained sequence detection information and / or error detection information.
  • the processor is configured to: according to the received feedback signal, extract a phase offset of a signal output by the equalizer, and calculate The average value of the phase shift amount obtains phase shift data, and phase recovers the signal output from the equalizer according to the phase shift data.
  • the sequence detection information is sequence detection soft value information and/or sequence detection hard
  • the error detection information is error detection soft value information and/or error detection hard decision information; wherein the soft value information is used to reflect the probability that each sequence symbol in the signal is a set symbol, and/or The information indicating that each sequence symbol in the signal is a set probability of different symbols; the hard decision information is information for reflecting a specific value of each sequence symbol in the signal.
  • the information that the information iteration device feeds back the feedback signal to the phase recovery device is not greater than The number of times the information iteration device performs the iteration of the soft value information.
  • the phase recovery device can perform phase recovery on the signal output by the equalizer according to the feedback signal fed back by the information iteration device, and output the phase restored signal to the post filter device. And performing noise filtering on the phase-recovered signal by the post-filtering device, and outputting the noise-filtered signal to the information iterative device; wherein the feedback signal is an information iterative device passing a soft value The iterative manner of the information, the sequence detection and error detection of the noise filtered signal output by the post filtering device, the obtained sequence detection information and/or error detection information.
  • the iteration of the soft value information and/or the hard decision information may be performed between the phase recovery device and the information iteration device, Phase recovery of the signal output by the equalizer. Since the output of the information iterative device is more accurate for the signal, the accuracy of the phase recovery can be greatly improved, the cycle is reduced, and the quality of the input signal of the post-filter device can be improved, and the existing turbo iterative method can be solved.
  • the system performance is improved, there is a problem that the input signal quality of the post filter cannot be improved or improved, and the performance improvement of the entire system is limited, thereby improving the performance of the system.
  • FIG. 1 is a schematic structural diagram of a conventional signal processing system for ISI
  • FIG. 2 is a schematic structural diagram of a signal processing system according to Embodiment 1 of the present invention.
  • FIG. 3 is a schematic structural diagram of a signal processing system according to Embodiment 1 of the present invention.
  • FIG. 4 is a schematic diagram showing another specific structure of the signal processing system according to Embodiment 1 of the present invention.
  • FIG. 5 is a flowchart of steps of a signal processing method according to Embodiment 2 of the present invention.
  • FIG. 6 is a schematic structural diagram of a phase recovery device according to Embodiment 3 of the present invention.
  • FIG. 7 is a schematic structural diagram of another phase recovery device according to Embodiment 3 of the present invention.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • the first embodiment of the present invention provides a signal processing system, and the signal processing system can be applied to any communication system receiver that processes the ISI in a turbo iterative manner, which is not limited in this embodiment of the present invention.
  • the system includes a phase recovery device 201, a post filter device 202, and an information iteration device 203:
  • the phase recovery device 201 is configured to receive a signal output by the equalizer and a feedback signal fed back by the information iteration device 203, and perform phase recovery on the signal output by the equalizer according to the feedback signal, and output a signal after phase recovery.
  • the post-filtering device 202 is configured to perform noise filtering on the phase-recovered signal output by the phase recovery device 201, and output the noise-filtered signal to the information iteration device 203;
  • the information iteration device 203 is configured to perform sequence detection and error detection on the noise filtered signal output by the post filtering device 202 by using an iterative manner of the soft value information to restore the original signal;
  • the sequence detection information obtained at the time of detection and/or the error detection information obtained when the error detection is performed is fed back to the phase recovery device 201 as a feedback signal.
  • the phase recovery device 201 can phase-recover the signal output by the equalizer according to the feedback signal fed back by the information iteration device 203, and output the phase-recovered signal to the post-filter device.
  • 202 performing noise filtering on the phase-recovered signal by the post-filtering device 202, and outputting the noise-filtered signal to the information iteration device 203; wherein the feedback signal is the information
  • the iterative device 203 performs sequence detection and error checking on the noise filtered signal output by the post filtering device 202 by means of iterative of the soft value information, and the obtained sequence detection information and/or error detection information.
  • soft value information and/or hard decision information may be performed between the phase recovery device 201 and the information iteration device 203. Iterate to phase restore the signal output by the equalizer. Since the output of the information iteration device 203 is a more accurate judgment for the signal, the accuracy of the phase recovery can be greatly improved, the hopping period can be reduced, and the quality of the input signal of the post-filtering device 202 can be improved, and the existing turbo can be solved.
  • the system performance is improved by iterative method, there is a problem that the input signal quality of the post filter cannot be improved or not improved, and the performance improvement of the entire system is limited, thereby improving the performance of the system.
  • the phase recovery device 201 is configured to: extract, according to the received feedback signal, a phase offset of a signal output by the equalizer, and calculate an average value of the phase offset to obtain a phase offset.
  • the data is shifted, and the phase output of the signal output by the equalizer is phase-recovered according to the phase offset data.
  • phase recovery device 201 can only receive the signal output by the equalizer in the initial stage, the feedback signal fed back by the information iteration device 203 cannot be received. Therefore, in the initial phase recovery phase, the phase recovery device 201 is specifically configured to perform pre-judgment processing on the signal output by the equalizer to obtain signal pre-judgment data, and according to the pre-determined data.
  • the filter device 202 filters the phase-recovered signal output from the phase recovery device 201 by the post-filter device 202, and outputs the noise-filtered signal to the information iteration device 203.
  • phase recovery device 201 can phase-recover the signal output by the equalizer according to the feedback signal to achieve phase-based The signal iterative processing by the recovery device 201 and the information iteration device 203.
  • phase recovery device 201 can perform phase recovery on the signal output by the equalizer according to the feedback signal, and can also reuse the phase recovery in the previous cycle.
  • the data that is, the phase recovery is not required for each iteration), and the embodiment is not limited herein.
  • the phase recovery device 201 may specifically include a pre-judgment circuit and an ML (Maximum Likelihood) estimation circuit (also referred to as a sliding window average estimation circuit), where:
  • the pre-judging circuit is configured to receive a signal output by the equalizer, perform pre-judgment processing on the signal output by the equalizer, obtain pre-judgment data, and output the pre-judgment data to the ML estimating circuit;
  • the ML estimation circuit may be configured to calculate a phase offset according to the predicted data and perform averaging processing in the initial phase recovery phase to obtain first phase offset data, and according to the first phase offset data,
  • the signal output by the equalizer performs initial phase recovery, and outputs the signal after the initial phase recovery to the post filtering device 202, so that the signal after the initial phase recovery is filtered by the post filtering device 202, and the noise filtering is output.
  • the divided signal is given to the information iteration device 203;
  • phase offset of the signal is calculated according to the received feedback signal, and the average value of the phase offset is calculated to obtain a second phase offset.
  • Data, and according to the second phase offset data phase-recover the signal output by the equalizer, and output the phase-recovered signal to the post-filtering device 202.
  • the phase recovery device 201 when the phase recovery device 201 performs phase recovery on the signal output by the equalizer for the first time, the signal can be pre-judged based on the pre-judgment circuit to obtain pre-judgment data, and then the phase offset is extracted based on the ML estimation circuit. And averaging the extracted phase offsets to reduce the influence of misjudgment in the pre-judging process and improve the accuracy of phase recovery; and when merging the signals output by the equalizer, it can be based on ML estimation.
  • the circuit performs phase recovery on the signal output by the equalizer according to the received feedback signal.
  • the feedback signal is more accurate judgment data, instead of erroneously judging the larger pre-judgment data, the accuracy of the phase recovery can be greatly improved, the jump is reduced, and the input signal of the post-filtering device 202 is further improved. Quality to improve system performance.
  • an appropriate pre-judging algorithm can be selected according to the type of the signal to be processed, so as to improve the accuracy of the pre-judging and ensure The basic performance of phase recovery.
  • QPSK Quadrature Phase Shift Keying
  • 16QAM Quadrature Amplitude Modulation
  • the algorithm such as the BPS (Blind Phase Search) algorithm, etc., is not described herein.
  • sequence detection information is sequence detection soft value information and/or sequence detection hard decision information
  • error detection information is error detection soft value information and/or error detection hard decision information
  • the soft value information is information for reflecting the probability that each sequence symbol in the signal is a set symbol, and/or for reflecting the ratio of the probability that each sequence symbol in the signal is a set different symbol; Information used to reflect the specific values of each sequence symbol in the signal.
  • each sequence symbol in a signal is usually not 1 and is 1. Therefore, in this case, each soft value information can generally be used to reflect that each sequence symbol in the signal is 0 or
  • the information of the probability of 1 and/or may also refer to information (ie, a fuzzy judgment result) for reflecting the ratio of the probability that each sequence symbol in the signal is 0 to the probability of a probability of one.
  • each hard decision information may generally refer to information for reflecting whether each sequence symbol in the signal is 0 or 1 (ie, a certain determination result), and details are not described herein again.
  • the set symbol may be "0".
  • Other values than "1" may be used, and the present embodiment is not limited herein.
  • the information iteration device 203 comprises a sequence detection device and an FEC device:
  • the sequence detecting device may be configured to receive the error check soft value information fed back by the FEC device, and perform sequence detection on the noise filtered signal output by the post filter device 202 according to the error check soft value information, and output
  • the sequence detection soft value information is sent to the FEC device, and the sequence detection soft value information and/or the sequence detection hard decision information obtained by performing sequence detection on the noise filtered signal output by the post filtering device 202 is used as The feedback signal is fed back to the phase recovery device 201;
  • the FEC device may be configured to perform error checking on the sequence detection soft value information output by the sequence detecting device to recover an original signal, and feed back error test soft value information to the sequence detecting device.
  • the feedback signal received by the phase recovery device 201 can be only the sequence detection information obtained when the information iteration device 203 performs sequence detection.
  • the feedback signal received by the phase recovery device 201 may also be only the error detection information obtained when the information iteration device 203 performs error detection.
  • the sequence detecting device and the FEC device included in the information iteration device 203 can be used to implement the following functions:
  • the sequence detecting device may be configured to receive the error check soft value information fed back by the FEC device, and perform sequence detection on the noise filtered signal output by the post filter device 202 according to the error check soft value information, and output Sequence detection soft value information to the FEC device;
  • the FEC device may be configured to perform error checking on the sequence detection soft value information output by the sequence detecting device to recover an original signal, and feed back error test soft value information to the sequence detecting device, and The error check soft value information and/or the error check hard decision information obtained by performing error test on the sequence detection soft value information output by the sequence detecting device is fed back to the phase recovery device 201 as a feedback signal.
  • the feedback signal received by the phase recovery device 201 may be the sequence detection information obtained when the information iteration device 203 performs sequence detection and the error detection information obtained when the information iteration device 203 performs error detection.
  • the information iteration device 203 includes a sequence
  • the detection device and the FEC device can be used to implement the following functions:
  • the sequence detecting device may be configured to receive the error check soft value information fed back by the FEC device, and perform sequence detection on the noise filtered signal output by the post filter device 202 according to the error check soft value information, and output
  • the sequence detection soft value information is sent to the FEC device, and the sequence detection soft value information and/or the sequence detection hard decision information obtained by performing sequence detection on the noise filtered signal output by the post filtering device 202 is used as The feedback signal is fed back to the phase recovery device 201;
  • the FEC device may be configured to perform error checking on the sequence detection soft value information output by the sequence detecting device to recover an original signal, and feed back error test soft value information to the sequence detecting device, and The error check soft value information and/or the error check hard decision information obtained by performing error test on the sequence detection soft value information output by the sequence detecting device is fed back to the phase recovery device 201 as a feedback signal.
  • phase detection soft signal information and/or the sequence detection hard decision information fed back by the sequence detecting device performs phase recovery on the signal output by the equalizer, the iterative delay is small, but the disadvantage is The accuracy is relatively low; according to the error check soft value information and/or the error check hard judgment information fed back by the FEC device, the phase recovery of the signal output by the equalizer has the advantage that the accuracy is relatively high, but the disadvantage is that it is extended. The time is large, so that a suitable feedback signal can be selected according to the actual situation, which is not described herein.
  • the number of times the information iteration device 203 feeds back the feedback signal to the phase recovery device 201 is not greater than the number of times the information iteration device 203 performs the iteration of the soft value information.
  • the sequence detecting device feeds back the sequence detection soft value information and/or the sequence detection hard decision information to the phase recovery device 201
  • the FEC device feeds back the error check soft value information to the phase recovery device 201.
  • the number of times and/or error checking hard decision information may be separately designed according to system performance, but less than or equal to the number of times the FEC device feeds back the error check soft value information to the sequence detecting device. That is, after the turbo iteration between the sequence detecting device and the FEC device is stopped, the sequence detecting device and/or the FEC device will not feed back the corresponding inverse to the phase recovery device 201.
  • the phase recovery device includes a pre-judging circuit and an ML estimating circuit
  • the feedback data received by the phase recovery device is from the sequence detecting device
  • the signal processing system The structure can be specifically as shown in FIG. It can be seen from FIG. 3 that, at this time, the workflow of the signal processing system may specifically be:
  • the pre-judging circuit receives the signal output by the equalizer, and performs pre-judgment processing on the signal output by the equalizer to obtain pre-judgment data, and outputs the pre-judgment data to the ML estimating circuit;
  • the ML estimating circuit calculates a phase offset according to the predicted data and performs averaging processing to obtain first phase offset data, and performs initial phase recovery on the signal output by the equalizer according to the first phase offset data, and Outputting the signal after the initial phase recovery to the post filter device;
  • the post filtering device performs noise filtering on the signal after the initial phase recovery, and outputs the noise filtered signal to the sequence detecting device;
  • the sequence detecting device performs sequence detection on the noise filtered signal according to the error check soft value information fed back by the FEC device, and outputs sequence detection soft value information to the FEC device, and detects the sequence soft value information and/or Or the sequence detection hard decision information obtained by performing sequence detection on the noise filtered signal output by the post filtering device is fed back to the ML estimation circuit of the phase recovery device as a feedback signal; thus, the ML estimation circuit receives After the feedback signal fed back by the sequence detecting device, the signal outputted by the equalizer is phase-recovered according to the feedback signal, and a new phase-recovered signal is output to the post-filtering device to implement the phase recovery device and the sequence detecting device. Iteration between the information;
  • the FEC device may perform error checking on the sequence detection soft value information output by the sequence detecting device to restore the original Signaling and feedback error checking soft value information to the sequence detecting device.
  • the sequence detecting device may perform sequence detection on the noise filtered signal output by the post filtering device according to the error check soft value information fed back by the FEC device, and output a new sequence detection soft value information to the Describe the FEC device, and use the new sequence detection soft value information and/or the sequence detection hard decision information as a new feedback signal to the phase recovery device, so that the FEC device can perform the new sequence detection soft value information. Error checking to more accurately achieve the recovery of the original signal.
  • the number of times the FEC device feeds back the error check soft value information to the sequence detecting device may be the same as the number of times the sequence detecting device feeds back the feedback signal to the phase detecting device, or may be larger than the sequence detecting device The number of times the phase recovery device feeds back the feedback signal. Specifically, in FIG. 3, the two are the same as an example, which is schematically illustrated.
  • the ML estimation circuit, the post-filtering device, the FEC device, and the like may be only one, and the corresponding functions may be realized by cyclic processing and iteration; or as shown in FIG. 3
  • there are a plurality of, for example, three ML estimation circuits and three post-filtering devices that is, the number of information iterations between the phase recovery device and the sequence detecting device is two
  • the sequence detecting device and the FEC device are also 3 (that is, the number of turbo iterations is also 2), and this embodiment will not be described herein.
  • the phase recovery device includes a pre-judging circuit and an ML estimating circuit
  • the feedback data received by the phase recovery device is from the FEC device
  • the signal processing system The structure can be specifically as shown in FIG. 4.
  • the workflow of the signal processing system may specifically be:
  • the pre-judging circuit receives the signal output by the equalizer, and performs pre-judgment processing on the signal output by the equalizer to obtain pre-judgment data, and outputs the pre-judgment data to the ML estimating circuit;
  • the ML estimating circuit calculates a phase offset according to the predicted data, and performs averaging processing to obtain first phase offset data, and performs initial phase recovery on the signal output by the equalizer according to the first phase offset data, And outputting the signal after the initial phase recovery to the post filter device;
  • the post filtering device performs noise filtering on the signal after the initial phase recovery, and outputs noise Filtering the signal to the sequence detecting device;
  • the sequence detecting device performs sequence detection on the noise filtered signal according to the error check soft value information fed back by the FEC device, and outputs the sequence detection soft value information to the FEC device;
  • the FEC device may perform error checking on the sequence detection soft value information output by the sequence detecting device to recover the original signal, and feed back the error check soft value information.
  • the sequence detecting device is supplied, and the error check soft value information and/or the error check hard decision information is fed back as a feedback signal to the ML estimating circuit of the phase recovery device.
  • the ML estimation circuit can perform phase recovery on the signal output by the equalizer again according to the feedback signal, and output a new phase restored signal to the post filter device to implement Iteration of information between the phase recovery device and the FEC device.
  • the sequence detecting device may perform sequence detection on the noise filtered signal output by the post filtering device according to the error check soft value information fed back by the FEC device, and output a new sequence detection soft value information to the
  • the FEC device is described such that the FEC device can perform error checking on the new sequence detection soft value information to more accurately achieve recovery of the original signal.
  • the number of times the FEC device feeds back the error check soft value information to the sequence detecting device may be the same as the number of times the FEC device feeds back the feedback signal to the phase recovery device, or may be greater than the FEC device feeding back the feedback signal to the phase recovery device. frequency. Specifically, in FIG. 4, the number of times the FEC device feeds back the error check soft value information to the sequence detecting device is greater than the number of times the FEC device feeds back the feedback signal to the phase recovery device, and is schematically illustrated.
  • the ML estimation circuit, the post-filtering device, the FEC device, and the like may be only one, and the corresponding functions may be realized by cyclic processing and iteration; or as shown in FIG. 4
  • ML estimation circuit and post filter device ie, the number of information iterations between the phase recovery device and the FEC device is 2), and the sequence detection device and the FEC device are 5 (That is, the number of turbo iterations is 4), and this embodiment does not describe it here.
  • the phase The bit recovery device may perform phase recovery on the signal output by the equalizer according to the feedback signal fed back by the information iteration device, and output the phase restored signal to the post filter device to recover the phase after the post filter device
  • the signal is subjected to noise filtering, and the noise filtered signal is output to the information iterative device; wherein the feedback signal is an output of the information filtering device through the iterative manner of the soft value information to the post filtering device
  • the noise filtered signal is subjected to sequence detection and error checking, and the resulting sequence detection information and/or error detection information.
  • the iteration of the soft value information and/or the hard decision information may be performed between the phase recovery device and the information iteration device, Phase recovery of the signal output by the equalizer. Since the output of the information iterative device is more accurate for the signal, the accuracy of the phase recovery can be greatly improved, the cycle is reduced, and the quality of the input signal of the post-filter device can be improved, and the existing turbo iterative method can be solved.
  • the system performance is improved, there is a problem that the input signal quality of the post filter cannot be improved or improved, and the performance improvement of the entire system is limited, thereby improving the performance of the system.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • a second embodiment of the present invention provides a signal processing method. Specifically, as shown in FIG. 5, it is a flowchart of steps in a signal processing method according to Embodiment 2 of the present invention, where the method includes :
  • Step 501 The phase recovery device receives the signal output by the equalizer and the feedback signal fed back by the information iterator.
  • Step 502 Perform phase recovery on the signal output by the equalizer according to the feedback signal, and output a phase-recovered signal to the post-filtering device, so that the post-filtering device performs noise on the phase-recovered signal. Filtering and outputting the noise filtered signal to the information iterative device;
  • the feedback signal is a manner in which the information iterative device performs sequence detection and error detection on the noise filtered signal output by the post filtering device by means of iterative manner of the soft value information, and the obtained sequence detection information and / or error detection information.
  • the phase recovery device may perform phase recovery on the signal output by the equalizer according to the feedback signal fed back by the information iteration device, and output phase recovery.
  • the signal is sent to the post-filtering device to perform noise filtering on the phase-recovered signal by the post-filtering device, and output the noise-filtered signal to the information iterative device; wherein the feedback
  • the signal is used by the information iterative device to perform sequence detection and error detection on the noise filtered signal output by the post filtering device by means of iterative filtering of the soft value information, and the obtained sequence detection information and/or error detection information.
  • the iteration of the soft value information and/or the hard decision information may be performed between the phase recovery device and the information iteration device, Phase recovery of the signal output by the equalizer. Since the output of the information iterative device is more accurate for the signal, the accuracy of the phase recovery can be greatly improved, the cycle is reduced, and the quality of the input signal of the post-filter device can be improved, and the existing turbo iterative method can be solved.
  • the system performance is improved, there is a problem that the input signal quality of the post filter cannot be improved or improved, and the performance improvement of the entire system is limited, thereby improving the performance of the system.
  • phase recovery is performed on the signal output by the equalizer according to the feedback signal, including:
  • the phase recovery device since in the initial stage, the phase recovery device can only receive the signal output by the equalizer, and cannot receive the feedback signal fed back by the information iterative device. Therefore, in the initial phase recovery phase, the phase recovery device may perform pre-judgment processing on the signal output by the equalizer to obtain signal pre-judgment data, and calculate a phase offset according to the pre-judgment data, and the phase offset is The quantity is averaged to obtain phase offset data, and according to the phase offset data, the phase output of the signal output by the equalizer is phase-recovered to output the phase-recovered signal to the post-filtering device, and the phase filtering is performed by the post-filtering device. The phase-recovered signal outputted by the device is subjected to noise filtering, and the noise-filtered signal is output to the information iterative device.
  • the phase recovery device may perform phase recovery on the signal output by the equalizer according to the feedback signal to implement a phase recovery device. And signal iterative processing of the information iteration device.
  • the phase recovery device may re-use the phase recovered data in the previous cycle in addition to the phase recovery of the signal output by the equalizer according to the feedback signal. (In other words, it is not necessary to perform phase recovery again for each iteration), and the embodiment is not limited herein.
  • sequence detection information is sequence detection soft value information and/or sequence detection hard decision information
  • error detection information is error detection soft value information and/or error detection hard decision information
  • the soft value information is information for reflecting the probability that each sequence symbol in the signal is a set symbol, and/or for reflecting the ratio of the probability that each sequence symbol in the signal is a set different symbol; Information used to reflect the specific values of each sequence symbol in the signal.
  • the number of times the information iterative device feeds back the feedback signal to the phase recovery device is not greater than the number of times the information iteration device performs the iteration of the soft value information.
  • the number of times the information iterative device feeds back the sequence detection information and/or the error detection information to the phase recovery device may be separately designed according to system performance, but less than or equal to the number of times the soft information information is exchanged in the information iteration device. That is, after the turbo iteration performed in the information iteration device stops, the information iteration device will not feed back the corresponding feedback signal to the phase recovery device, but when the iteration between the information iteration device and the phase recovery device stops or When it is not started, the corresponding turbo iteration can still be performed in the information iteration device, which is not described herein.
  • Embodiment 3 is a diagrammatic representation of Embodiment 3
  • the third embodiment of the present invention provides a phase recovery device.
  • the phase recovery device refer to the description of the second embodiment of the foregoing method or the first embodiment of the system. .
  • FIG. 6 it is a schematic structural diagram of a phase recovery device according to Embodiment 3 of the present invention, where the device includes:
  • the receiving module 601 is configured to receive a signal output by the equalizer and a feedback signal fed back by the information iteration device;
  • the phase recovery module 602 is configured to perform phase recovery on the signal output by the equalizer according to the feedback signal.
  • the output module 603 is configured to output a phase-recovered signal to the post-filtering device to The filtering device performs noise filtering on the phase-recovered signal, and outputs the noise filtered signal to the information iterating device;
  • the feedback signal is a manner in which the information iterative device performs sequence detection and error detection on the noise filtered signal output by the post filtering device by means of iterative manner of the soft value information, and the obtained sequence detection information and / or error detection information.
  • the phase recovery device provided in this embodiment can perform phase recovery on the signal output by the equalizer according to the feedback signal fed back by the information iteration device, and output the phase restored signal to the post filter device to
  • the filtering device performs noise filtering on the phase-recovered signal, and outputs a noise-filtered signal to the information iterative device; wherein the feedback signal is an iteration of the information iterative device through soft value information And performing sequence detection and error checking on the noise-filtered signal output by the post-filtering device, and obtaining the sequence detection information and/or the error detection information.
  • the phase recovery device provided in this embodiment can perform soft value information and/or hard decision information with the information iteration device when the soft value information is exchanged in the information iteration device to improve system performance. Iterate to phase restore the signal output by the equalizer. Since the output of the information iterative device is more accurate for the signal, the accuracy of the phase recovery can be greatly improved, the cycle is reduced, and the quality of the input signal of the post-filter device can be improved, and the existing turbo iterative method can be solved. When the system performance is improved, there is a problem that the input signal quality of the post filter cannot be improved or improved, and the performance improvement of the entire system is limited, thereby improving the performance of the system.
  • the phase recovery module 602 is configured to: according to the feedback signal received by the receiving module 601, extract a phase offset of a signal output by the equalizer, and calculate an average of the phase offset Value, phase offset data is obtained, and phase recovery of the signal output by the equalizer is performed based on the phase offset data.
  • the receiving module 601 can only receive the signal output by the equalizer, and cannot receive the feedback signal fed back by the information iterative device.
  • the phase recovery module 602 is specifically operable to input the equalizer
  • the signal is pre-judged, the signal pre-judgment data is obtained, and the phase offset is calculated according to the pre-judgment data, and the phase offset is averaged to obtain phase offset data, and the phase offset data is obtained according to the phase offset data.
  • performing phase recovery on the signal output by the equalizer so that the output module 603 outputs the phase-recovered signal to the post-filtering device, and the post-filtering device performs noise on the phase-recovered signal output by the output module 603. Filter out and output the noise filtered signal to the information iterator.
  • the receiving module 601 After receiving (ie, in the subsequent phase recovery phase), the receiving module 601 receives the feedback signal fed back by the information iterative device, and the phase recovery module 602 can perform phase recovery on the signal output by the equalizer according to the feedback signal. To implement signal iterative processing based on phase recovery means and information iteration means.
  • phase recovery module 602 can perform phase recovery on the signal output by the equalizer according to the feedback signal, and can also reuse the phase recovery in the previous cycle.
  • the data that is, the phase recovery is not required for each iteration), and the embodiment is not limited herein.
  • sequence detection information is sequence detection soft value information and/or sequence detection hard decision information
  • error detection information is error detection soft value information and/or error detection hard decision information
  • the soft value information is information for reflecting the probability that each sequence symbol in the signal is a set symbol, and/or for reflecting the ratio of the probability that each sequence symbol in the signal is a set different symbol; Information used to reflect the specific values of each sequence symbol in the signal.
  • the number of times the information iterative device feeds back the feedback signal to the phase recovery device is not greater than the number of times the information iteration device performs the iteration of the soft value information.
  • the number of times the information iterative device feeds back the sequence detection information and/or the error detection information to the receiving module 601 may be separately designed according to system performance, but less than or equal to the number of times the soft information information is exchanged in the information iteration device. That is to say, after the turbo iteration performed in the information iteration device stops, the information iteration device does not feed back the corresponding feedback signal to the receiving module 601 of the phase recovery device, but when between the information iteration device and the phase recovery device When the iteration is stopped or not started, the corresponding turbo iteration can still be performed in the information iteration device, which is not described in this embodiment.
  • the third embodiment of the present invention further provides another phase recovery device, which is a corresponding phase recovery entity device.
  • another phase recovery device may include:
  • a receiver 701 configured to receive a signal output by the equalizer and a feedback signal fed back by the information iterator;
  • the processor 702 is configured to perform phase recovery on the signal output by the equalizer according to the feedback signal received by the receiver 701.
  • the transmitter 703 is configured to output a phase-recovered signal to the post-filtering device, to perform noise filtering on the phase-recovered signal by the post-filtering device, and output the noise-filtered signal to the information iteration.
  • the feedback signal is a manner in which the information iterative device performs sequence detection and error detection on the noise filtered signal output by the post filtering device by means of iterative manner of the soft value information, and the obtained sequence detection information and / or error detection information.
  • the processor 702 is specifically configured to: according to the received feedback signal, extract a phase offset of the signal output by the equalizer, and calculate an average value of the phase offset to obtain phase offset data. And performing phase recovery on the signal output by the equalizer according to the phase offset data.
  • sequence detection information is sequence detection soft value information and/or sequence detection hard decision information
  • error detection information is error detection soft value information and/or error detection hard decision information
  • soft value information Is used to reflect the probability that each sequence symbol in the signal is a set symbol, and/or information for reflecting the ratio of the probability that each sequence symbol in the signal is a set different symbol
  • hard decision information is used to reflect Information on the specific value of each sequence symbol in the signal.
  • the number of times the information iterative device feeds back the feedback signal to the phase recovery device is not greater than the number of times the information iterative device performs the iteration of the soft value information.
  • the processor 702 may have a corresponding CPU (Central Processing Unit), MCU (Microcontroller Unit), DSP (digital signal processing), and the like. Data processing capability device, circuit or group thereof
  • the receiver 701 may be a corresponding signal input interface or the like
  • the transmitter 703 may be a corresponding signal output interface or the like, and details are not described herein again.
  • embodiments of the present invention can be provided as a method, apparatus (device), or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.
  • a computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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Abstract

一种信号处理系统、方法及装置，可利用相位恢复装置接收信息迭代装置反馈的反馈信号，并根据所述反馈信号对均衡器输出的信号进行相位恢复，并输出相位恢复后的信号给后置滤波装置，以由后置滤波装置对所述相位恢复后的信号进行噪声滤除并输出给所述信息迭代装置。即，可以基于信息迭代装置反馈的信号，对均衡器输出的信号进行相位恢复，由于信息迭代装置的输出是针对信号更为准确的判断，所以可以提升相位恢复的精度，减少跳周，提高后置滤波装置输入信号的质量，因此能够解决现有的turbo迭代方式不能或无法较佳地改善后置滤波器的输入信号质量，使得整个系统性能提升受限的问题，提升系统性能。

Description

一种信号处理系统、方法及装置 技术领域
本发明涉及通信领域，尤其涉及一种信号处理系统、方法及装置。
背景技术
谱效率(Spectrum Effectiveness)是净比特率、或最大吞吐量与通信信道或数据链路的带宽之比，其是通信系统设计的关键指标。谱效率越高，通信速率、用户容量等将会越高，从而提高整个通信系统的性能。
具体地，目前通常可采用压缩谱宽的方式来提高谱效率，但是该方式会引入码间串扰(Inter-symbol Interference，ISI)，劣化系统性能。针对这一问题，目前可以在发射机侧采用数字信号处理技术，利用有限冲击响应滤波器预整形压缩信号带宽。区别于常规通信系统所采用的均衡器(Equalization)+相位恢复模块(Phase Recovery)+前向纠错模块(Forward Error Correction,FEC)的结构，针对这种超窄带信号，通常在相位恢复模块之后、FEC之前加上后置滤波器(Post Filter)以及序列检测器(Sequence Estimation)，来抵抗ISI，提升系统性能，具体可如图1所示。
具体地，序列检测器可对后置滤波器输出的信号进行序列检测，以抵抗后置滤波器对信号进行噪声滤除时所引入的码间干扰，使得信号中的各序列符号正确恢复，并将相应的序列检测软值信息输出给FEC，由FEC对该序列检测软值信息进行差错检验，以恢复原始信号。进一步，可在序列检测器和FEC之间，采用turbo迭代的方式来交换软值信息，以提升系统性能。如，FEC可将相应的差错检验软值信息反馈给序列检测器，以便序列检测器可根据FEC反馈的差错检验软值信息，对后置滤波器输出的信号进行进一步地序列检测，并输出新的序列检测软值信息给FEC，由FEC根据之前的差错检验软值信息，对该新的序列检测软值信息进行差错检验，以更为准确地恢复原始信号。其中，软值信息可指的是信号中的各序列符号为设定符号(如0或1等)的概率 的信息，和/或，各序列符号为设定的不同符号的概率比值(如为0的概率与为1的概率的比值)的信息等。
但是，由于对于带宽受限系统(如存在ISI的系统等)来说，接收信号通常可带有很大损伤，具体可表现为均衡器输出信号质量下降。这样的信号在通过相位恢复模块进行相位恢复时，会引入大量跳周，产生的错误信号会传递到后置滤波器，使得后置滤波器输入信号质量劣化。且，由图1可知，turbo迭代的输入来自后置滤波器的输出，如果后置滤波器输入信号质量劣化，通过序列检测和FEC之间的迭代将不能或不能较佳地改善其输入信号质量，导致turbo迭代补偿能力受限，进而使得整个系统性能提升有限。
也就是说，在通过现有的turbo迭代方式来提升系统性能时，会存在不能或无法较佳地改善后置滤波器的输入信号质量，使得整个系统性能提升受限的问题，从而使得系统性能提升效果并不佳。
发明内容
本发明实施例提供了一种信号处理系统、方法及装置，用以解决通过现有的turbo迭代方式来提升通信系统性能，不能或无法较佳地改善后置滤波器的输入信号质量，使得整个系统性能提升受限的问题。
第一方面，提供了一种信号处理系统，包括：
相位恢复装置，用于接收均衡器输出的信号以及信息迭代装置反馈的反馈信号，并根据所述反馈信号，对均衡器输出的信号进行相位恢复，并输出相位恢复后的信号给后置滤波装置；
后置滤波装置，用于对所述相位恢复装置输出的相位恢复后的信号进行噪声滤除，并输出噪声滤除后的信号给信息迭代装置；
信息迭代装置，用于通过软值信息的迭代的方式，对所述后置滤波装置输出的噪声滤除后的信号进行序列检测以及差错检验，以恢复原始信号；并将进行序列检测时所得到的序列检测信息和/或进行差错检测时所得到的差错检测信息作为反馈信号，反馈给所述相位恢复装置。
结合第一方面，在第一方面的第一种可能的实现方式中，所述相位恢复装置，具体用于根据接收到的所述反馈信号，提取均衡器输出的信号的相位偏移量，并计算所述相位偏移量的平均值，得到相位偏移数据，并根据所述相位偏移数据，对均衡器输出的信号进行相位恢复。
结合第一方面或第一方面的第一种可能的实现方式，在第一方面的第二种可能的实现方式中，所述序列检测信息为序列检测软值信息和/或序列检测硬判信息；所述差错检测信息为差错检测软值信息和/或差错检测硬判信息；其中，软值信息是用于反映信号中的各序列符号为设定符号的概率，和/或，用于反映信号中的各序列符号为设定的不同符号的概率之比的信息；硬判信息是用于反映信号中的各序列符号的具体取值的信息。
结合第一方面的第二种可能的实现方式，在第一方面的第三种可能的实现方式中，所述信息迭代装置包括序列检测设备以及FEC设备：
所述序列检测设备，用于接收FEC设备反馈的差错检验软值信息，并根据所述差错检验软值信息对所述后置滤波装置输出的噪声滤除后的信号进行序列检测，并输出序列检测软值信息给FEC设备，并且，将所述序列检测软值信息和/或对所述后置滤波装置输出的噪声滤除后的信号进行序列检测所得到的序列检测硬判信息作为反馈信号反馈给所述相位恢复装置；
所述FEC设备，用于对所述序列检测设备输出的所述序列检测软值信息进行差错检验，以恢复原始信号，并反馈差错检验软值信息给所述序列检测设备。
结合第一方面的第二种可能的实现方式，在第一方面的第四种可能的实现方式中，所述信息迭代装置包括序列检测设备以及FEC设备：
所述序列检测设备，用于接收FEC设备反馈的差错检验软值信息，并根据所述差错检验软值信息对所述后置滤波装置输出的噪声滤除后的信号进行序列检测，并输出序列检测软值信息给FEC设备；
所述FEC设备，用于对所述序列检测设备输出的所述序列检测软值信息进行差错检验，以恢复原始信号，并反馈差错检验软值信息给所述序列检测 设备，并且，将所述差错检验软值信息和/或对所述序列检测设备输出的所述序列检测软值信息进行差错检验所得到的差错检验硬判信息作为反馈信号反馈给所述相位恢复装置。
结合第一方面的第二种可能的实现方式，在第一方面的第五种可能的实现方式中，所述信息迭代装置包括序列检测设备以及FEC设备：
所述序列检测设备，用于接收FEC设备反馈的差错检验软值信息，并根据所述差错检验软值信息对所述后置滤波装置输出的噪声滤除后的信号进行序列检测，并输出序列检测软值信息给FEC设备，并且，将所述序列检测软值信息和/或对所述后置滤波装置输出的噪声滤除后的信号进行序列检测所得到的序列检测硬判信息作为反馈信号反馈给所述相位恢复装置；
所述FEC设备，用于对所述序列检测设备输出的所述序列检测软值信息进行差错检验，以恢复原始信号，并反馈差错检验软值信息给所述序列检测设备，并且，将所述差错检验软值信息和/或对所述序列检测设备输出的所述序列检测软值信息进行差错检验所得到的差错检验硬判信息作为反馈信号反馈给所述相位恢复装置。
结合第一方面或第一方面的第一种可能的实现方式，在第一方面的第六种可能的实现方式中，所述信息迭代装置向所述相位恢复装置反馈反馈信号的次数不大于所述信息迭代装置进行软值信息的迭代的次数。
第二方面，提供了一种信号处理方法，包括：
相位恢复装置接收均衡器输出的信号以及信息迭代装置反馈的反馈信号；
根据所述反馈信号，对均衡器输出的信号进行相位恢复，并输出相位恢复后的信号给后置滤波装置，以由所述后置滤波装置对所述相位恢复后的信号进行噪声滤除，并输出噪声滤除后的信号给信息迭代装置；
其中，所述反馈信号为所述信息迭代装置通过软值信息的迭代的方式，对所述后置滤波装置输出的噪声滤除后的信号进行序列检测以及差错检验，所得到的序列检测信息和/或差错检测信息。
结合第二方面，在第二方面的第一种可能的实现方式中，根据所述反馈信号，对均衡器输出的信号进行相位恢复，包括：
根据接收到的所述反馈信号，提取均衡器输出的信号的相位偏移量，并计算所述相位偏移量的平均值，得到相位偏移数据，并根据所述相位偏移数据，对均衡器输出的信号进行相位恢复。
结合第二方面或第二方面的第一种可能实现方式，在第二方面的第二种可能的实现方式中，所述序列检测信息为序列检测软值信息和/或序列检测硬判信息；所述差错检测信息为差错检测软值信息和/或差错检测硬判信息；其中，软值信息是用于反映信号中的各序列符号为设定符号的概率，和/或，用于反映信号中的各序列符号为设定的不同符号的概率之比的信息；硬判信息是用于反映信号中的各序列符号的具体取值的信息。
结合第二方面或第二方面的第一种可能实现方式，在第二方面的第三种可能的实现方式中，所述信息迭代装置向所述相位恢复装置反馈反馈信号的次数不大于所述信息迭代装置进行软值信息的迭代的次数。
第三方面，提供了一种相位恢复装置，所述装置包括：
接收模块，用于接收均衡器输出的信号以及信息迭代装置反馈的反馈信号；
相位恢复模块，用于根据所述反馈信号，对均衡器输出的信号进行相位恢复；
输出模块，用于输出相位恢复后的信号给后置滤波装置，以由所述后置滤波装置对所述相位恢复后的信号进行噪声滤除，并输出噪声滤除后的信号给信息迭代装置；
其中，所述反馈信号为所述信息迭代装置通过软值信息的迭代的方式，对所述后置滤波装置输出的噪声滤除后的信号进行序列检测以及差错检验，所得到的序列检测信息和/或差错检测信息。
结合第三方面，在第三方面的第一种可能的实现方式中，所述相位恢复模块，具体用于根据接收到的所述反馈信号，提取均衡器输出的信号的相位 偏移量，并计算所述相位偏移量的平均值，得到相位偏移数据，并根据所述相位偏移数据，对均衡器输出的信号进行相位恢复。
结合第三方面或第三方面的第一种可能实现方式，在第三方面的第二种可能的实现方式中，所述序列检测信息为序列检测软值信息和/或序列检测硬判信息；所述差错检测信息为差错检测软值信息和/或差错检测硬判信息；其中，软值信息是用于反映信号中的各序列符号为设定符号的概率，和/或，用于反映信号中的各序列符号为设定的不同符号的概率之比的信息；硬判信息是用于反映信号中的各序列符号的具体取值的信息。
结合第三方面或第三方面的第一种可能实现方式，在第三方面的第三种可能的实现方式中，所述信息迭代装置向所述相位恢复装置反馈反馈信号的次数不大于所述信息迭代装置进行软值信息的迭代的次数。
第四方面，提供了一种相位恢复装置，所述装置包括：
接收器，用于接收均衡器输出的信号以及信息迭代装置反馈的反馈信号；
处理器，用于根据所述接收器接收到的所述反馈信号，对均衡器输出的信号进行相位恢复；
发送器，用于输出相位恢复后的信号给后置滤波装置，以由所述后置滤波装置对所述相位恢复后的信号进行噪声滤除，并输出噪声滤除后的信号给信息迭代装置；
其中，所述反馈信号为所述信息迭代装置通过软值信息的迭代的方式，对所述后置滤波装置输出的噪声滤除后的信号进行序列检测以及差错检验，所得到的序列检测信息和/或差错检测信息。
结合第四方面，在第四方面的第一种可能的实现方式中，所述处理器，具体用于根据接收到的所述反馈信号，提取均衡器输出的信号的相位偏移量，并计算所述相位偏移量的平均值，得到相位偏移数据，并根据所述相位偏移数据，对均衡器输出的信号进行相位恢复。
结合第四方面或第四方面的第一种可能实现方式，在第四方面的第二种可能的实现方式中，所述序列检测信息为序列检测软值信息和/或序列检测硬 判信息；所述差错检测信息为差错检测软值信息和/或差错检测硬判信息；其中，软值信息是用于反映信号中的各序列符号为设定符号的概率，和/或，用于反映信号中的各序列符号为设定的不同符号的概率之比的信息；硬判信息是用于反映信号中的各序列符号的具体取值的信息。
结合第四方面或第四方面的第一种可能实现方式，在第四方面的第三种可能的实现方式中，所述信息迭代装置向所述相位恢复装置反馈反馈信号的次数不大于所述信息迭代装置进行软值信息的迭代的次数。
根据第一～第四方面提供的系统、方法及装置，相位恢复装置可根据信息迭代装置反馈的反馈信号，对均衡器输出的信号进行相位恢复，并输出相位恢复后的信号给后置滤波装置，以由所述后置滤波装置对所述相位恢复后的信号进行噪声滤除，并输出噪声滤除后的信号给所述信息迭代装置；其中，所述反馈信号为信息迭代装置通过软值信息的迭代的方式，对所述后置滤波装置输出的噪声滤除后的信号进行序列检测以及差错检验，所得到的序列检测信息和/或差错检测信息。也就是说，在采用turbo迭代的方式在信息迭代装置中交换软值信息来提升系统性能时，可以在相位恢复装置和信息迭代装置之间进行软值信息和/或硬判信息的迭代，以对均衡器输出的信号进行相位恢复。由于信息迭代装置的输出是针对信号更为准确的判断，所以可以大大提升相位恢复的精度，减少跳周，进而可以提高后置滤波装置的输入信号的质量，解决在通过现有的turbo迭代方式来提升系统性能时，存在不能或无法较佳地改善后置滤波器的输入信号质量，使得整个系统性能提升受限的问题，提升了系统的性能。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简要介绍，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，对于本领域的普通技术人员来讲，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所示为现有的针对ISI的信号处理系统的结构示意图；
图2所示为本发明实施例一中所述信号处理系统的结构示意图；
图3所示为本发明实施例一中所述信号处理系统的一种具体的结构示意图；
图4所示为本发明实施例一中所述信号处理系统的另一种具体的结构示意图；
图5所示为本发明实施例二中所述信号处理方法的步骤流程图；
图6所示为本发明实施例三中所述相位恢复装置的结构示意图；
图7所示为本发明实施例三中所述另一种相位恢复装置的结构示意图。
具体实施方式
为了使本发明的目的、技术方案和优点更加清楚，下面将结合附图对本发明作进一步地详细描述，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做出创造性劳动前提下所获得的所有其它实施例，都属于本发明保护的范围。
实施例一：
本发明实施例一提供了一种信号处理系统，所述信号处理系统可适用于任何采用turbo迭代方式处理ISI的通信系统接收机，本发明实施例对此不作任何限定。具体地，如图2所示，其为本发明实施例一中所述信号处理系统的结构示意图，所述系统包括相位恢复装置201、后置滤波装置202，以及信息迭代装置203：
所述相位恢复装置201，用于接收均衡器输出的信号以及信息迭代装置203反馈的反馈信号，并根据所述反馈信号，对均衡器输出的信号进行相位恢复，并输出相位恢复后的信号给后置滤波装置202；
所述后置滤波装置202，用于对所述相位恢复装置201输出的相位恢复后的信号进行噪声滤除，并输出噪声滤除后的信号给信息迭代装置203；
所述信息迭代装置203，用于通过软值信息的迭代的方式，对所述后置滤波装置202输出的噪声滤除后的信号进行序列检测以及差错检验，以恢复原始信号；并将进行序列检测时所得到的序列检测信息和/或进行差错检测时所得到的差错检测信息作为反馈信号，反馈给所述相位恢复装置201。
即，在本实施例提供的信号处理系统中，相位恢复装置201可根据信息迭代装置203反馈的反馈信号，对均衡器输出的信号进行相位恢复，并输出相位恢复后的信号给后置滤波装置202，以由所述后置滤波装置202对所述相位恢复后的信号进行噪声滤除，并输出噪声滤除后的信号给所述信息迭代装置203；其中，所述反馈信号为所述信息迭代装置203通过软值信息的迭代的方式，对所述后置滤波装置202输出的噪声滤除后的信号进行序列检测以及差错检验，所得到的序列检测信息和/或差错检测信息。
也就是说，在采用turbo迭代的方式在信息迭代装置203中交换软值信息来提升系统性能时，可以在相位恢复装置201和信息迭代装置203之间进行软值信息和/或硬判信息的迭代，以对均衡器输出的信号进行相位恢复。由于信息迭代装置203的输出是针对信号更为准确的判断，所以可以大大提升相位恢复的精度，减少跳周，进而可以提高后置滤波装置202的输入信号的质量，解决在通过现有的turbo迭代方式来提升系统性能时，存在不能或无法较佳地改善后置滤波器的输入信号质量，使得整个系统性能提升受限的问题，提升了系统的性能。
可选地，所述相位恢复装置201，具体用于根据接收到的所述反馈信号，提取均衡器输出的信号的相位偏移量，并计算所述相位偏移量的平均值，得到相位偏移数据，并根据所述相位偏移数据，对均衡器输出的信号进行相位恢复。
进一步地，需要说明的是，由于在初始阶段，所述相位恢复装置201通常仅能接收到均衡器输出的信号，而无法接收到信息迭代装置203反馈的反馈信号。因而，在初始相位恢复阶段，所述相位恢复装置201具体可用于对均衡器输出的信号进行预判处理，得到信号预判数据，并根据该预判数据计 算相位偏移量，并对该相位偏移量进行平均处理，得到相位偏移数据，并根据该相位偏移数据，对均衡器输出的信号进行相位恢复，以输出相位恢复后的信号给后置滤波装置202，由后置滤波装置202对相位恢复装置201输出的相位恢复后的信号进行噪声滤除，并输出噪声滤除后的信号给信息迭代装置203。
之后(即在后续相位恢复阶段)，若接收到信息迭代装置203反馈的反馈信号，所述相位恢复装置201即可根据所述反馈信号，对均衡器输出的信号进行相位恢复，以实现基于相位恢复装置201和信息迭代装置203的信号迭代处理。
当然，需要说明的是，在后续相位恢复阶段，所述相位恢复装置201除了可根据所述反馈信号，对均衡器输出的信号进行相位恢复之外，也可以重用前次循环中相位恢复后的数据(即不是每次迭代都需要重新进行相位恢复)，本实施例在此不作任何限定。
可选地，与现有技术类似，所述相位恢复装置201具体可包括预判电路以及ML(Maximum Likelihood，最大似然)估计电路(也可称为滑窗平均估计电路)，其中：
所述预判电路，可用于接收均衡器输出的信号，并对均衡器输出的信号进行预判处理，得到预判数据，并将所述预判数据输出给所述ML估计电路；
所述ML估计电路，可用于在初始相位恢复阶段，根据所述预判数据计算相位偏移量并进行平均处理，得到第一相位偏移数据，并根据所述第一相位偏移数据，对均衡器输出的信号进行初始相位恢复，并输出初始相位恢复后的信号给后置滤波装置202，以由后置滤波装置202对所述初始相位恢复后的信号进行噪声滤除后，输出噪声滤除后的信号给信息迭代装置203；以及，
在后续相位恢复阶段，接收信息迭代装置203反馈的反馈信号，根据接收到的所述反馈信号计算信号的相位偏移量，并计算所述相位偏移量的平均值，得到第二相位偏移数据，并根据所述第二相位偏移数据，对均衡器输出的信号进行相位恢复，并输出相位恢复后的信号给后置滤波装置202。
也就是说，所述相位恢复装置201在首次对均衡器输出的信号进行相位恢复时，可基于预判电路对该信号进行预判处理，得到预判数据，再基于ML估计电路提取相位偏移量并对提取的相位偏移量进行平均处理，以降低预判处理中的误判的影响，提高相位恢复的准确性；而在后续对均衡器输出的信号进行相位恢复时，可基于ML估计电路来根据接收到的反馈信号，对均衡器输出的信号进行相位恢复。由于所述反馈信号是更为精准的判断数据，因而，用其来代替误判较大的预判数据，可大大提高相位恢复的精度，减少跳周，进而提高后置滤波装置202的输入信号的质量，提高系统性能。
需要说明的是，由于所述预判电路的预判准确度能够决定相位恢复的基本性能，因而，可以根据待处理信号的类型来选择适宜的预判算法，以提高预判的准确性，保证相位恢复的基本性能。例如，对于QPSK(Quadrature Phase Shift Keying，正交相移键控)信号，可以采用4次方的预判算法；对于16QAM(Quadrature Amplitude Modulation，正交幅度调制)信号，则可以采用更为复杂的算法，如BPS(Blind Phase Search)算法等，本实施例在此不作赘述。
进一步地，需要说明的是，所述序列检测信息为序列检测软值信息和/或序列检测硬判信息；所述差错检测信息为差错检测软值信息和/或差错检测硬判信息；其中，软值信息是用于反映信号中的各序列符号为设定符号的概率，和/或，用于反映信号中的各序列符号为设定的不同符号的概率之比的信息；硬判信息是用于反映信号中的各序列符号的具体取值的信息。
例如，在2电平调制系统中，信号中的各序列符号通常不为0则为1，因而，此时，各软值信息通常可指的是用于反映信号中的各序列符号为0或1的概率的信息，和/或，还可指的是用于反映信号中的各序列符号为0的概率与为1的概率的概率之比的信息(即为一个模糊的判断结果)。类似地，各硬判信息通常可指的是用于反映信号中的各序列符号具体为0还是为1的信息(即为一个确定的判断结果)，此处均不再赘述。
另外，需要说明的是，由于本实施例提供的所述系统，不只适用于2电平调制系统，也可适用于更高阶调制系统，因而，所述设定符号除了可为“0”， “1”之外，还可为其他数值，本实施例在此不作任何限定。
可选地，所述信息迭代装置203包括序列检测设备以及FEC设备：
所述序列检测设备，可用于接收FEC设备反馈的差错检验软值信息，并根据所述差错检验软值信息对所述后置滤波装置202输出的噪声滤除后的信号进行序列检测，并输出序列检测软值信息给FEC设备，并且，将所述序列检测软值信息和/或对所述后置滤波装置202输出的噪声滤除后的信号进行序列检测所得到的序列检测硬判信息作为反馈信号反馈给所述相位恢复装置201；
所述FEC设备，可用于对所述序列检测设备输出的所述序列检测软值信息进行差错检验，以恢复原始信号，并反馈差错检验软值信息给所述序列检测设备。
也就是说，相位恢复装置201接收到的反馈信号可仅为信息迭代装置203进行序列检测时所得到的序列检测信息。
当然，相位恢复装置201接收到的反馈信号还可仅为信息迭代装置203进行差错检测时所得到的差错检测信息。此种情况下，所述信息迭代装置203包括的序列检测设备以及FEC设备可分别用于实现以下功能：
所述序列检测设备，可用于接收FEC设备反馈的差错检验软值信息，并根据所述差错检验软值信息对所述后置滤波装置202输出的噪声滤除后的信号进行序列检测，并输出序列检测软值信息给FEC设备；
所述FEC设备，可用于对所述序列检测设备输出的所述序列检测软值信息进行差错检验，以恢复原始信号，并反馈差错检验软值信息给所述序列检测设备，并且，将所述差错检验软值信息和/或对所述序列检测设备输出的所述序列检测软值信息进行差错检验所得到的差错检验硬判信息作为反馈信号反馈给所述相位恢复装置201。
进一步地，相位恢复装置201接收到的反馈信号还可为信息迭代装置203进行序列检测时所得到的序列检测信息以及信息迭代装置203进行差错检测时所得到的差错检测信息。此种情况下，所述信息迭代装置203包括的序列 检测设备以及FEC设备可分别用于实现以下功能：
所述序列检测设备，可用于接收FEC设备反馈的差错检验软值信息，并根据所述差错检验软值信息对所述后置滤波装置202输出的噪声滤除后的信号进行序列检测，并输出序列检测软值信息给FEC设备，并且，将所述序列检测软值信息和/或对所述后置滤波装置202输出的噪声滤除后的信号进行序列检测所得到的序列检测硬判信息作为反馈信号反馈给所述相位恢复装置201；
所述FEC设备，可用于对所述序列检测设备输出的所述序列检测软值信息进行差错检验，以恢复原始信号，并反馈差错检验软值信息给所述序列检测设备，并且，将所述差错检验软值信息和/或对所述序列检测设备输出的所述序列检测软值信息进行差错检验所得到的差错检验硬判信息作为反馈信号反馈给所述相位恢复装置201。
其中，需要说明的是，由于根据所述序列检测设备反馈的序列检测软值信息和/或序列检测硬判信息对均衡器输出的信号进行相位恢复，具备迭代延时较小的优点，但坏处是准确度相对较低；根据所述FEC设备反馈的差错检验软值信息和/或差错检验硬判信息对均衡器输出的信号进行相位恢复的优点是准确度相对较高，但坏处是迭代延时较大，因此可以根据实际情况选择合适的反馈信号，本实施例在此不作赘述。
进一步地，需要说明的是，所述信息迭代装置203向所述相位恢复装置201反馈反馈信号的次数不大于所述信息迭代装置203进行软值信息的迭代的次数。
即，所述序列检测设备向所述相位恢复装置201反馈序列检测软值信息和/或序列检测硬判信息的次数，以及，所述FEC设备向所述相位恢复装置201反馈差错检验软值信息和/或差错检验硬判信息的次数可根据系统性能单独设计，但小于等于所述FEC设备向所述序列检测设备反馈差错检验软值信息的次数。也就是说，当在序列检测设备和FEC设备之间进行的turbo迭代停止后，序列检测设备和/或FEC设备也不会再向相位恢复装置201反馈相应的反 馈信号，但是，当序列检测设备和/或FEC设备与相位恢复装置201之间的迭代停止或未开始时，在序列检测设备和FEC设备之间仍可进行相应的turbo迭代，本实施例在此不作赘述。
下面将以两个具体实例来说明本发明实施例所述的信号处理系统的具体工作流程：
实例一：
假设，相位恢复装置包括预判电路以及ML估计电路，且，相位恢复装置(具体为相位恢复装置的ML估计电路)接收到的反馈数据来自序列检测设备，则，此时，所述信号处理系统的结构具体可如图3所示。由图3可知，此时，所述信号处理系统的工作流程具体可为：
预判电路接收均衡器输出的信号，并对均衡器输出的信号进行预判处理，得到预判数据，并将所述预判数据输出给ML估计电路；
ML估计电路根据所述预判数据计算相位偏移量并进行平均处理，得到第一相位偏移数据，并根据所述第一相位偏移数据，对均衡器输出的信号进行初始相位恢复，并将初始相位恢复后的信号输出给后置滤波装置；
后置滤波装置对所述初始相位恢复后的信号进行噪声滤除，并输出噪声滤除后的信号给序列检测设备；
序列检测设备根据FEC设备反馈的差错检验软值信息，对所述噪声滤除后的信号进行序列检测，并输出序列检测软值信息给FEC设备，以及，将所述序列检测软值信息和/或对所述后置滤波装置输出的噪声滤除后的信号进行序列检测所得到的序列检测硬判信息作为反馈信号反馈给所述相位恢复装置的ML估计电路；这样，ML估计电路在接收到序列检测设备反馈的反馈信号后，可根据所述反馈信号再次对均衡器输出的信号进行相位恢复，并输出新的相位恢复后的信号给后置滤波装置，以实现相位恢复装置与序列检测设备之间的信息的迭代；
相应地，FEC设备在接收到序列检测设备输出的序列检测软值信息后，可对所述序列检测设备输出的序列检测软值信息进行差错检验，以恢复原始 信号，并反馈差错检验软值信息给所述序列检测设备。这样，序列检测设备可根据所述FEC设备反馈的差错检验软值信息，再次对所述后置滤波装置输出的噪声滤除后的信号进行序列检测，并输出新的序列检测软值信息给所述FEC设备，以及将新的序列检测软值信息和/或序列检测硬判信息作为新的反馈信号给所述相位恢复装置，以使得所述FEC设备可对该新的序列检测软值信息进行差错检验，以更为准确地实现原始信号的恢复。
其中，所述FEC设备向所述序列检测设备反馈差错检验软值信息的次数可以与所述序列检测设备向所述相位恢复装置反馈反馈信号的次数相同，也可大于所述序列检测设备向所述相位恢复装置反馈反馈信号的次数。具体地，在图3中，以二者相同为例，对其进行了示意说明。
另外，需要说明的是，在实际的信号处理系统中，ML估计电路、后置滤波装置、FEC设备等可仅为一个，通过循环处理、迭代即可实现相应功能；也可以如图3中所示，分别为多个，如ML估计电路、以及后置滤波装置为3个(即，相位恢复装置与序列检测设备之间的信息迭代次数为2次)，序列检测设备、以及FEC设备也为3个(即，turbo迭代次数也为2次)，本实施例在此不作赘述。
实例二：
假设，相位恢复装置包括预判电路以及ML估计电路，且，相位恢复装置(具体为相位恢复装置的ML估计电路)接收到的反馈数据来自FEC设备，则，此时，所述信号处理系统的结构具体可如图4所示。由图4可知，此时，所述信号处理系统的工作流程具体可为：
预判电路接收均衡器输出的信号，并对均衡器输出的信号进行预判处理，得到预判数据，并将所述预判数据输出给ML估计电路；
ML估计电路根据所述预判数据计算相位偏移量，并且进行平均处理，得到第一相位偏移数据，并根据所述第一相位偏移数据，对均衡器输出的信号进行初始相位恢复，并将初始相位恢复后的信号输出给后置滤波装置；
后置滤波装置对所述初始相位恢复后的信号进行噪声滤除，并输出噪声 滤除后的信号给序列检测设备；
序列检测设备根据FEC设备反馈的差错检验软值信息，对所述噪声滤除后的信号进行序列检测，并输出序列检测软值信息给FEC设备；
相应地，FEC设备在接收到序列检测设备输出的序列检测软值信息后，可对所述序列检测设备输出的序列检测软值信息进行差错检验，以恢复原始信号，并反馈差错检验软值信息给所述序列检测设备，以及，将差错检验软值信息和/或差错检验硬判信息作为反馈信号反馈给所述相位恢复装置的ML估计电路。这样，ML估计电路在接收到FEC设备反馈的反馈信号后，可根据所述反馈信号再次对均衡器输出的信号进行相位恢复，并输出新的相位恢复后的信号给后置滤波装置，以实现相位恢复装置与FEC设备之间的信息的迭代。
同时，序列检测设备可根据所述FEC设备反馈的差错检验软值信息，再次对所述后置滤波装置输出的噪声滤除后的信号进行序列检测，并输出新的序列检测软值信息给所述FEC设备，以使得所述FEC设备可对该新的序列检测软值信息进行差错检验，以更为准确地实现原始信号的恢复。
其中，FEC设备向所述序列检测设备反馈差错检验软值信息的次数可以与FEC设备向所述相位恢复装置反馈反馈信号的次数相同，也可大于FEC设备向所述相位恢复装置反馈反馈信号的次数。具体地，在图4中，以FEC设备向所述序列检测设备反馈差错检验软值信息的次数大于FEC设备向所述相位恢复装置反馈反馈信号的次数为例，对其进行了示意说明。
另外，需要说明的是，在实际的信号处理系统中，ML估计电路、后置滤波装置、FEC设备等可仅为一个，通过循环处理、迭代即可实现相应功能；也可以如图4中所示，分别为多个，如ML估计电路、以及后置滤波装置为3个(即，相位恢复装置与FEC设备之间的信息迭代次数为2次)，序列检测设备、以及FEC设备为5个(即，turbo迭代次数为4次)，本实施例在此不作赘述。
由本发明实施例所述内容可知，在本实施例提供的信号处理系统中，相 位恢复装置可根据信息迭代装置反馈的反馈信号，对均衡器输出的信号进行相位恢复，并输出相位恢复后的信号给后置滤波装置，以由所述后置滤波装置对所述相位恢复后的信号进行噪声滤除，并输出噪声滤除后的信号给所述信息迭代装置；其中，所述反馈信号为信息迭代装置通过软值信息的迭代的方式，对所述后置滤波装置输出的噪声滤除后的信号进行序列检测以及差错检验，所得到的序列检测信息和/或差错检测信息。也就是说，在采用turbo迭代的方式在信息迭代装置中交换软值信息来提升系统性能时，可以在相位恢复装置和信息迭代装置之间进行软值信息和/或硬判信息的迭代，以对均衡器输出的信号进行相位恢复。由于信息迭代装置的输出是针对信号更为准确的判断，所以可以大大提升相位恢复的精度，减少跳周，进而可以提高后置滤波装置的输入信号的质量，解决在通过现有的turbo迭代方式来提升系统性能时，存在不能或无法较佳地改善后置滤波器的输入信号质量，使得整个系统性能提升受限的问题，提升了系统的性能。
实施例二：
基于同样的发明构思，本发明实施例二提供了一种信号处理方法，具体地，如图5所示，其为本发明实施例二中所述信号处理方法的步骤流程图，所述方法包括：
步骤501：相位恢复装置接收均衡器输出的信号以及信息迭代装置反馈的反馈信号；
步骤502：根据所述反馈信号，对均衡器输出的信号进行相位恢复，并输出相位恢复后的信号给后置滤波装置，以由所述后置滤波装置对所述相位恢复后的信号进行噪声滤除，并输出噪声滤除后的信号给信息迭代装置；
其中，所述反馈信号为所述信息迭代装置通过软值信息的迭代的方式，对所述后置滤波装置输出的噪声滤除后的信号进行序列检测以及差错检验，所得到的序列检测信息和/或差错检测信息。
即，在本实施例提供的信号处理方法中，相位恢复装置可根据信息迭代装置反馈的反馈信号，对均衡器输出的信号进行相位恢复，并输出相位恢复 后的信号给后置滤波装置，以由所述后置滤波装置对所述相位恢复后的信号进行噪声滤除，并输出噪声滤除后的信号给所述信息迭代装置；其中，所述反馈信号为所述信息迭代装置通过软值信息的迭代的方式，对所述后置滤波装置输出的噪声滤除后的信号进行序列检测以及差错检验，所得到的序列检测信息和/或差错检测信息。
也就是说，在采用turbo迭代的方式在信息迭代装置中交换软值信息来提升系统性能时，可以在相位恢复装置和信息迭代装置之间进行软值信息和/或硬判信息的迭代，以对均衡器输出的信号进行相位恢复。由于信息迭代装置的输出是针对信号更为准确的判断，所以可以大大提升相位恢复的精度，减少跳周，进而可以提高后置滤波装置的输入信号的质量，解决在通过现有的turbo迭代方式来提升系统性能时，存在不能或无法较佳地改善后置滤波器的输入信号质量，使得整个系统性能提升受限的问题，提升了系统的性能。
可选地，根据所述反馈信号，对均衡器输出的信号进行相位恢复，包括：
根据接收到的所述反馈信号，提取均衡器输出的信号的相位偏移量，并计算所述相位偏移量的平均值，得到相位偏移数据，并根据所述相位偏移数据，对均衡器输出的信号进行相位恢复。
进一步地，需要说明的是，由于在初始阶段，所述相位恢复装置通常仅能接收到均衡器输出的信号，而无法接收到信息迭代装置反馈的反馈信号。因而，在初始相位恢复阶段，所述相位恢复装置具体可对均衡器输出的信号进行预判处理，得到信号预判数据，并根据该预判数据计算相位偏移量，并对该相位偏移量进行平均处理，得到相位偏移数据，并根据该相位偏移数据，对均衡器输出的信号进行相位恢复，以输出相位恢复后的信号给后置滤波装置，由后置滤波装置对相位恢复装置输出的相位恢复后的信号进行噪声滤除，并输出噪声滤除后的信号给信息迭代装置。
之后(即在后续相位恢复阶段)，若接收到信息迭代装置反馈的反馈信号，所述相位恢复装置即可根据所述反馈信号，对均衡器输出的信号进行相位恢复，以实现基于相位恢复装置和信息迭代装置的信号迭代处理。
当然，需要说明的是，在后续相位恢复阶段，所述相位恢复装置除了可根据所述反馈信号，对均衡器输出的信号进行相位恢复之外，也可以重用前次循环中相位恢复后的数据(即不是每次迭代都需要重新进行相位恢复)，本实施例在此不作任何限定。
进一步地，需要说明的是，所述序列检测信息为序列检测软值信息和/或序列检测硬判信息；所述差错检测信息为差错检测软值信息和/或差错检测硬判信息；其中，软值信息是用于反映信号中的各序列符号为设定符号的概率，和/或，用于反映信号中的各序列符号为设定的不同符号的概率之比的信息；硬判信息是用于反映信号中的各序列符号的具体取值的信息。
进一步地，需要说明的是，所述信息迭代装置向所述相位恢复装置反馈反馈信号的次数不大于所述信息迭代装置进行软值信息的迭代的次数。
即，所述信息迭代装置向所述相位恢复装置反馈序列检测信息和/或差错检测信息的次数可根据系统性能单独设计，但小于等于所述信息迭代装置中交换软值信息的次数。也就是说，当在信息迭代装置中进行的turbo迭代停止后，信息迭代装置也不会再向相位恢复装置反馈相应的反馈信号，但是，当信息迭代装置与相位恢复装置之间的迭代停止或未开始时，在信息迭代装置中仍可进行相应的turbo迭代，本实施例在此不作赘述。
实施例三：
基于同样的发明构思，本发明实施例三提供了一种相位恢复装置，该相位恢复装置的具体实施可参见上述方法实施例二、或系统实施例一中的相关描述，重复之处不再赘述。具体地，如图6所示，其为本发明实施例三中所述相位恢复装置的结构示意图，所述装置包括：
接收模块601，用于接收均衡器输出的信号以及信息迭代装置反馈的反馈信号；
相位恢复模块602，用于根据所述反馈信号，对均衡器输出的信号进行相位恢复；
输出模块603，用于输出相位恢复后的信号给后置滤波装置，以由所述后 置滤波装置对所述相位恢复后的信号进行噪声滤除，并输出噪声滤除后的信号给信息迭代装置；
其中，所述反馈信号为所述信息迭代装置通过软值信息的迭代的方式，对所述后置滤波装置输出的噪声滤除后的信号进行序列检测以及差错检验，所得到的序列检测信息和/或差错检测信息。
即，在本实施例提供的相位恢复装置，可根据信息迭代装置反馈的反馈信号，对均衡器输出的信号进行相位恢复，并输出相位恢复后的信号给后置滤波装置，以由所述后置滤波装置对所述相位恢复后的信号进行噪声滤除，并输出噪声滤除后的信号给所述信息迭代装置；其中，所述反馈信号为所述信息迭代装置通过软值信息的迭代的方式，对所述后置滤波装置输出的噪声滤除后的信号进行序列检测以及差错检验，所得到的序列检测信息和/或差错检测信息。
也就是说，在采用turbo迭代的方式在信息迭代装置中交换软值信息来提升系统性能时，本实施例所提供的相位恢复装置可与信息迭代装置进行软值信息和/或硬判信息的迭代，以对均衡器输出的信号进行相位恢复。由于信息迭代装置的输出是针对信号更为准确的判断，所以可以大大提升相位恢复的精度，减少跳周，进而可以提高后置滤波装置的输入信号的质量，解决在通过现有的turbo迭代方式来提升系统性能时，存在不能或无法较佳地改善后置滤波器的输入信号质量，使得整个系统性能提升受限的问题，提升了系统的性能。
可选地，所述相位恢复模块602，具体用于根据所述接收模块601接收到的所述反馈信号，提取均衡器输出的信号的相位偏移量，并计算所述相位偏移量的平均值，得到相位偏移数据，并根据所述相位偏移数据，对均衡器输出的信号进行相位恢复。
进一步地，需要说明的是，由于在初始阶段，所述接收模块601通常仅能接收到均衡器输出的信号，而无法接收到信息迭代装置反馈的反馈信号。因而，在初始相位恢复阶段，所述相位恢复模块602具体可用于对均衡器输 出的信号进行预判处理，得到信号预判数据，并根据该预判数据计算相位偏移量，并对该相位偏移量进行平均处理，得到相位偏移数据，并根据该相位偏移数据，对均衡器输出的信号进行相位恢复，以由所述输出模块603输出相位恢复后的信号给后置滤波装置，由后置滤波装置对所述输出模块603输出的相位恢复后的信号进行噪声滤除，并输出噪声滤除后的信号给信息迭代装置。
之后(即在后续相位恢复阶段)，所述接收模块601若接收到信息迭代装置反馈的反馈信号，所述相位恢复模块602即可根据所述反馈信号，对均衡器输出的信号进行相位恢复，以实现基于相位恢复装置和信息迭代装置的信号迭代处理。
当然，需要说明的是，在后续相位恢复阶段，所述相位恢复模块602除了可根据所述反馈信号，对均衡器输出的信号进行相位恢复之外，也可以重用前次循环中相位恢复后的数据(即不是每次迭代都需要重新进行相位恢复)，本实施例在此不作任何限定。
进一步地，需要说明的是，所述序列检测信息为序列检测软值信息和/或序列检测硬判信息；所述差错检测信息为差错检测软值信息和/或差错检测硬判信息；其中，软值信息是用于反映信号中的各序列符号为设定符号的概率，和/或，用于反映信号中的各序列符号为设定的不同符号的概率之比的信息；硬判信息是用于反映信号中的各序列符号的具体取值的信息。
进一步地，需要说明的是，所述信息迭代装置向所述相位恢复装置反馈反馈信号的次数不大于所述信息迭代装置进行软值信息的迭代的次数。
即，所述信息迭代装置向所述接收模块601反馈序列检测信息和/或差错检测信息的次数可根据系统性能单独设计，但小于等于所述信息迭代装置中交换软值信息的次数。也就是说，当在信息迭代装置中进行的turbo迭代停止后，信息迭代装置也不会再向相位恢复装置的接收模块601反馈相应的反馈信号，但是，当信息迭代装置与相位恢复装置之间的迭代停止或未开始时，在信息迭代装置中仍可进行相应的turbo迭代，本实施例在此不作赘述。
进一步地，基于相同的发明构思，本发明实施例三还提供了另一种相位恢复装置，该另一种相位恢复装置为相应的相位恢复实体设备，其具体实施可参见上述方法实施例二、或系统实施例一中的相关描述，重复之处不再赘述。具体地，如图7所示，所述另一种相位恢复装置可包括：
接收器701，用于接收均衡器输出的信号以及信息迭代装置反馈的反馈信号；
处理器702，用于根据所述接收器701接收到的所述反馈信号，对均衡器输出的信号进行相位恢复；
发送器703，用于输出相位恢复后的信号给后置滤波装置，以由所述后置滤波装置对所述相位恢复后的信号进行噪声滤除，并输出噪声滤除后的信号给信息迭代装置；
其中，所述反馈信号为所述信息迭代装置通过软值信息的迭代的方式，对所述后置滤波装置输出的噪声滤除后的信号进行序列检测以及差错检验，所得到的序列检测信息和/或差错检测信息。
可选地，所述处理器702具体可用于根据接收到的所述反馈信号，提取均衡器输出的信号的相位偏移量，并计算所述相位偏移量的平均值，得到相位偏移数据，并根据所述相位偏移数据，对均衡器输出的信号进行相位恢复。
需要说明的是，所述序列检测信息为序列检测软值信息和/或序列检测硬判信息；所述差错检测信息为差错检测软值信息和/或差错检测硬判信息；其中，软值信息是用于反映信号中的各序列符号为设定符号的概率，和/或，用于反映信号中的各序列符号为设定的不同符号的概率之比的信息；硬判信息是用于反映信号中的各序列符号的具体取值的信息。
另外，需要说明的是，所述信息迭代装置向所述相位恢复装置反馈反馈信号的次数不大于所述信息迭代装置进行软值信息的迭代的次数。
再有，需要说明的是，所述处理器702可为CPU(Central Processing Unit，中央处理器)、MCU(Microcontroller Unit，微控制器)、DSP(digital signal processing，数字信号处理)等具备相应的数据处理能力的器件、电路或其组 合，所述接收器701可为相应的信号输入接口等，所述发送器703可为相应的信号输出接口等，此处均不再赘述。
本领域技术人员应明白，本发明的实施例可提供为方法、装置(设备)、或计算机程序产品。因此，本发明可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本发明可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。
本发明是参照根据本发明实施例的方法、装置(设备)和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
尽管已描述了本发明的优选实施例，但本领域内的技术人员一旦得知了基本创造性概念，则可对这些实施例作出另外的变更和修改。所以，所附权利要求意欲解释为包括优选实施例以及落入本发明范围的所有变更和修改。
显然，本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和范围。这样，倘若本发明的这些修改和变型属于本发明权利要 求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。

Claims (15)

  1. 一种信号处理系统，其特征在于，包括：
    相位恢复装置，用于接收均衡器输出的信号以及信息迭代装置反馈的反馈信号，并根据所述反馈信号，对均衡器输出的信号进行相位恢复，并输出相位恢复后的信号给后置滤波装置；
    后置滤波装置，用于对所述相位恢复装置输出的相位恢复后的信号进行噪声滤除，并输出噪声滤除后的信号给信息迭代装置；
    信息迭代装置，用于通过软值信息的迭代的方式，对所述后置滤波装置输出的噪声滤除后的信号进行序列检测以及差错检验，以恢复原始信号；并将进行序列检测时所得到的序列检测信息和/或进行差错检测时所得到的差错检测信息作为反馈信号，反馈给所述相位恢复装置。
  2. 如权利要求1所述的系统，其特征在于，
    所述相位恢复装置，具体用于根据接收到的所述反馈信号，提取均衡器输出的信号的相位偏移量，并计算所述相位偏移量的平均值，得到相位偏移数据，并根据所述相位偏移数据，对均衡器输出的信号进行相位恢复。
  3. 如权利要求1或2所述的系统，其特征在于，
    所述序列检测信息为序列检测软值信息和/或序列检测硬判信息；
    所述差错检测信息为差错检测软值信息和/或差错检测硬判信息；
    其中，软值信息是用于反映信号中的各序列符号为设定符号的概率，和/或，用于反映信号中的各序列符号为设定的不同符号的概率之比的信息；硬判信息是用于反映信号中的各序列符号的具体取值的信息。
  4. 如权利要求3所述的系统，其特征在于，所述信息迭代装置包括序列检测设备以及前向纠错设备：
    所述序列检测设备，用于接收前向纠错设备反馈的差错检验软值信息，并根据所述差错检验软值信息对所述后置滤波装置输出的噪声滤除后的信号进行序列检测，并输出序列检测软值信息给前向纠错设备，并且，将所述序 列检测软值信息和/或对所述后置滤波装置输出的噪声滤除后的信号进行序列检测所得到的序列检测硬判信息作为反馈信号反馈给所述相位恢复装置；
    所述前向纠错设备，用于对所述序列检测设备输出的所述序列检测软值信息进行差错检验，以恢复原始信号，并反馈差错检验软值信息给所述序列检测设备。
  5. 如权利要求3所述的系统，其特征在于，所述信息迭代装置包括序列检测设备以及前向纠错设备：
    所述序列检测设备，用于接收前向纠错设备反馈的差错检验软值信息，并根据所述差错检验软值信息对所述后置滤波装置输出的噪声滤除后的信号进行序列检测，并输出序列检测软值信息给前向纠错设备；
    所述前向纠错设备，用于对所述序列检测设备输出的所述序列检测软值信息进行差错检验，以恢复原始信号，并反馈差错检验软值信息给所述序列检测设备，并且，将所述差错检验软值信息和/或对所述序列检测设备输出的所述序列检测软值信息进行差错检验所得到的差错检验硬判信息作为反馈信号反馈给所述相位恢复装置。
  6. 如权利要求3所述的系统，其特征在于，所述信息迭代装置包括序列检测设备以及前向纠错设备：
    所述序列检测设备，用于接收前向纠错设备反馈的差错检验软值信息，并根据所述差错检验软值信息对所述后置滤波装置输出的噪声滤除后的信号进行序列检测，并输出序列检测软值信息给前向纠错设备，并且，将所述序列检测软值信息和/或对所述后置滤波装置输出的噪声滤除后的信号进行序列检测所得到的序列检测硬判信息作为反馈信号反馈给所述相位恢复装置；
    所述前向纠错设备，用于对所述序列检测设备输出的所述序列检测软值信息进行差错检验，以恢复原始信号，并反馈差错检验软值信息给所述序列检测设备，并且，将所述差错检验软值信息和/或对所述序列检测设备输出的所述序列检测软值信息进行差错检验所得到的差错检验硬判信息作为反馈信号反馈给所述相位恢复装置。
  7. 如权利要求1或2所述的系统，其特征在于，
    所述信息迭代装置向所述相位恢复装置反馈反馈信号的次数不大于所述信息迭代装置进行软值信息的迭代的次数。
  8. 一种信号处理方法，其特征在于，包括：
    相位恢复装置接收均衡器输出的信号以及信息迭代装置反馈的反馈信号；
    根据所述反馈信号，对均衡器输出的信号进行相位恢复，并输出相位恢复后的信号给后置滤波装置，以由所述后置滤波装置对所述相位恢复后的信号进行噪声滤除，并输出噪声滤除后的信号给信息迭代装置；
    其中，所述反馈信号为所述信息迭代装置通过软值信息的迭代的方式，对所述后置滤波装置输出的噪声滤除后的信号进行序列检测以及差错检验，所得到的序列检测信息和/或差错检测信息。
  9. 如权利要求8所述的方法，其特征在于，根据所述反馈信号，对均衡器输出的信号进行相位恢复，包括：
    根据接收到的所述反馈信号，提取均衡器输出的信号的相位偏移量，并计算所述相位偏移量的平均值，得到相位偏移数据，并根据所述相位偏移数据，对均衡器输出的信号进行相位恢复。
  10. 如权利要求8或9所述的方法，其特征在于，
    所述序列检测信息为序列检测软值信息和/或序列检测硬判信息；
    所述差错检测信息为差错检测软值信息和/或差错检测硬判信息；
    其中，软值信息是用于反映信号中的各序列符号为设定符号的概率，和/或，用于反映信号中的各序列符号为设定的不同符号的概率之比的信息；硬判信息是用于反映信号中的各序列符号的具体取值的信息。
  11. 如权利要求8或9所述的方法，其特征在于，
    所述信息迭代装置向所述相位恢复装置反馈反馈信号的次数不大于所述信息迭代装置进行软值信息的迭代的次数。
  12. 一种相位恢复装置，其特征在于，所述装置包括：
    接收模块，用于接收均衡器输出的信号以及信息迭代装置反馈的反馈信号；
    相位恢复模块，用于根据所述反馈信号，对均衡器输出的信号进行相位恢复；
    输出模块，用于输出相位恢复后的信号给后置滤波装置，以由所述后置滤波装置对所述相位恢复后的信号进行噪声滤除，并输出噪声滤除后的信号给信息迭代装置；
    其中，所述反馈信号为所述信息迭代装置通过软值信息的迭代的方式，对所述后置滤波装置输出的噪声滤除后的信号进行序列检测以及差错检验，所得到的序列检测信息和/或差错检测信息。
  13. 如权利要求12所述的装置，其特征在于，
    所述相位恢复模块，具体用于根据接收到的所述反馈信号，提取均衡器输出的信号的相位偏移量，并计算所述相位偏移量的平均值，得到相位偏移数据，并根据所述相位偏移数据，对均衡器输出的信号进行相位恢复。
  14. 如权利要求12或13所述的装置，其特征在于，
    所述序列检测信息为序列检测软值信息和/或序列检测硬判信息；
    所述差错检测信息为差错检测软值信息和/或差错检测硬判信息；
    其中，软值信息是用于反映信号中的各序列符号为设定符号的概率，和/或，用于反映信号中的各序列符号为设定的不同符号的概率之比的信息；硬判信息是用于反映信号中的各序列符号的具体取值的信息。
  15. 如权利要求12或13所述的装置，其特征在于，
    所述信息迭代装置向所述相位恢复装置反馈反馈信号的次数不大于所述信息迭代装置进行软值信息的迭代的次数。
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