WO2022111274A1

WO2022111274A1 - Decoding method, network device, system, and storage medium

Info

Publication number: WO2022111274A1
Application number: PCT/CN2021/129531
Authority: WO
Inventors: 卢彦兆; 肖治宇
Original assignee: 华为技术有限公司
Priority date: 2020-11-30
Filing date: 2021-11-09
Publication date: 2022-06-02
Also published as: CN114584254A

Abstract

Disclosed are a decoding method, a network device, a system, and a storage medium, for use in decoding a first subcarrier signal on the basis of the correlation between the first subcarrier signal and a second subcarrier signal so as to improve the accuracy of decoding the first subcarrier signal. The method comprises: a receiving device receives N subcarrier signals, the N subcarrier signals comprising one first subcarrier signal and M second subcarrier signals; M being a positive integer greater than or equal to 1; N being a positive integer greater than 1; M being less than N; the receiving device performs forward error correction (FEC) decoding on each of the second subcarrier signals to obtain first FEC external information, the first FEC external information being used for indicating a value of each bit comprised in the second subcarrier signal; the receiving device obtains an original signal of the first subcarrier signal according to the first subcarrier signal and M pieces of first FEC external information.

Description

A decoding method, network device, system and storage medium

This application claims the priority of the Chinese patent application filed on November 30, 2020, with the application number of 202011380992.7 and the application title of "A decoding method, network device, system and storage medium", the entire content of which is Incorporated herein by reference.

technical field

The present application relates to the field of communication technologies, and in particular, to a decoding method, network device, system, and storage medium.

Background technique

With the increasing demand for network capacity, the traffic of network equipment has evolved from 100G to 200G, 400G and even 800G and above. In order to adapt to the evolution of the traffic of the network equipment, the development of the network equipment from a single-carrier signal to a multi-channel sub-carrier signal is an irreversible trend.

In order to realize the interaction of multi-channel sub-carrier signals between two network devices, the network device as the transmitting device performs forward error correction (forward error correction, FEC) coding on each channel of sub-carrier signals independently. The network device as the receiving device performs FEC decoding on each sub-carrier signal independently.

During the transmission of multiple sub-carrier signals, each sub-carrier signal will be interfered by adjacent sub-carrier signals. However, by performing FEC decoding on the target sub-carrier signal independently by the receiving device, the interference of other sub-carrier signals adjacent to the target sub-carrier signal cannot be effectively suppressed, which reduces the accuracy of decoding.

SUMMARY OF THE INVENTION

Embodiments of the present application provide a decoding method, a network device, a system, and a storage medium, which are used to improve the accuracy of decoding a subcarrier signal.

In a first aspect, an embodiment of the present invention provides a decoding method. The method includes: a receiving device receives N channels of sub-carrier signals, where the N channels of sub-carrier signals include one channel of first sub-carrier signals and M channels of second sub-carrier signals, the The first subcarrier signal is any one of the N channels of subcarrier signals, the M is a positive integer greater than or equal to 1, the N is a positive integer greater than 1, and M is less than N; The two sub-carrier signals are subjected to forward error correction FEC decoding to obtain the first extra-FEC information, and the first extra-FEC information is used to indicate the value of each bit included in the second sub-carrier signal; the receiving device is based on the The original signal of the first sub-carrier signal is obtained from the first sub-carrier signal and the M pieces of the first extra-FEC information.

It can be seen that, as shown in this aspect, the M pieces of first FEC extra-information of the M channels of second subcarrier signals are used to assist the decoding of the first subcarrier signal. It can be seen that in the process of decoding the first subcarrier signal, the interference of the second subcarrier signal to the first subcarrier signal is effectively suppressed, and the accuracy of decoding the first subcarrier signal is effectively improved .

Based on the first aspect, in an optional implementation manner, the receiving device acquiring the original signal of the first sub-carrier signal according to the first sub-carrier signal and the M pieces of the first external information includes: the receiving device acquiring the target Subcarrier signal, the target subcarrier signal is generated by duplicating the first subcarrier signal; the receiving device obtains the original subcarrier signal of the first subcarrier signal according to the target subcarrier signal and M pieces of information outside the first FEC Signal.

It can be seen that, as shown in this aspect, the target sub-carrier signal can be obtained by duplicating the first sub-carrier signal. Then, obtain the correlation between the first subcarrier signal and the second subcarrier signal according to the target subcarrier signal and the M pieces of information outside the first FEC. Decoding the first subcarrier signal based on the correlation effectively suppresses the interference of the second subcarrier signal to the first subcarrier signal.

Based on the first aspect, in an optional implementation manner, before the receiving device obtains the original signal of the first sub-carrier signal according to the target sub-carrier signal and the M pieces of the first extra-FEC information, the method further includes: the The receiving device performs FEC decoding on the first subcarrier signal to obtain second extra-FEC information, where the second extra-FEC information is used to indicate the value of each bit included in the first subcarrier signal.

It can be seen that, in this aspect, the second FEC outer information of the first subcarrier signal is obtained, and the first subcarrier signal is decoded by the second FEC outer signal and the M pieces of first FEC outer information, which effectively improves the accuracy of the first subcarrier signal. The accuracy with which the signal is decoded.

Based on the first aspect, in an optional implementation manner, before the receiving device obtains the original signal of the first sub-carrier signal according to the target sub-carrier signal and the M pieces of the first extra-FEC information, the method further includes: the The receiving device acquires M first cross-correlation coefficients, where the M first cross-correlation coefficients are the correlation coefficients between the first symbol information and the M second symbol information respectively, and the first symbol information is that the target subcarrier signal includes At least one symbol of the M pieces of second symbol information respectively includes at least one symbol corresponding to the M pieces of the first extra FEC information.

It can be seen that by obtaining the first cross-correlation coefficients between the first symbol information and the M pieces of second symbol information, the correlation between the first sub-carrier signal and the second sub-carrier signal is effectively obtained, which improves the accuracy of The accuracy of decoding the first subcarrier signal.

Based on the first aspect, in an optional implementation manner, the receiving device obtains the original signal of the first sub-carrier signal according to the target sub-carrier signal and the M pieces of the first external information, including: the receiving device determining the The difference between the first symbol information, the first target parameter and the M second target parameters is the original signal of the first subcarrier signal;

according to the formula

obtaining the original signal R _i ^* of the first sub-carrier signal;

Wherein, the first target parameter a _i *X _i is the product between the second cross-correlation coefficient X _i and the first symbol information a _i , and the second cross-correlation coefficient is the first symbol information and the third symbol information Correlation coefficient between, the third symbol information includes at least one symbol corresponding to the second external FEC information, the M second target parameters are the M second symbol information (b ₁ , b ₂ , b ₃ to The products between b _M ) and the M first cross-correlation coefficients (Y ₁ , Y ₂ , Y ₃ to Y _M ), respectively.

It can be seen that the first target parameter is used to reflect the correlation between different symbols within the first subcarrier signal. The M second target parameters are respectively used to represent the correlation between each channel of the second subcarrier signal and the first subcarrier signal. In this aspect, the first subcarrier signal is decoded based on the ISI correlation relationship between the first subcarrier signal and the second subcarrier signal, which effectively improves the decoding accuracy of the first subcarrier signal.

Based on the first aspect, in an optional implementation manner, before the receiving device obtains the original signal of the first sub-carrier signal according to the target sub-carrier signal and the M pieces of the first extra-FEC information, the method further includes: the The receiving device acquires M third cross-correlation coefficients, where the M third cross-correlation coefficients are the correlation coefficients between the first phase information and the M second phase information respectively, and the first phase information is the correlation coefficient of the target subcarrier signal. phase, the M pieces of second phase information are respectively the phases of the M pieces of information outside the first FEC.

As shown in this aspect, the receiving device can decode the first sub-carrier signal based on the phase noise correlation between the first sub-carrier signal and the second sub-carrier signal, which effectively improves the decoding of the first sub-carrier signal. Decoding accuracy.

Based on the first aspect, in an optional implementation manner, the receiving device obtains the original signal of the first sub-carrier signal according to the target sub-carrier signal and the M pieces of the first external information, including: the receiving device according to the formula

Get the phase of the original signal

It can be seen that the phase of the original signal

is the first phase information

The difference with the M third target parameters is the phase of the original signal of the first subcarrier signal, wherein the M third target parameters are the M third cross-correlation coefficients (Z ₁ , Z ₂ , Z ₃ to Z _M ) and the M pieces of second phase information (

to

);

The receiving device acquires the original signal of the first sub-carrier signal according to the phase of the original signal of the first sub-carrier signal.

It can be seen that the first sub-carrier signal is decoded based on the correlation of the phase noise between the first sub-carrier signal and the second sub-carrier signal. In the process of decoding the first sub-carrier signal, the interference between the second sub-carrier signal and the first sub-carrier signal is effectively suppressed, so as to realize the compensation for the interference of the first sub-carrier signal, thereby realizing the compensation of the interference of the first sub-carrier signal. The accuracy of decoding the first subcarrier signal is effectively improved.

Based on the first aspect, in an optional implementation manner, after the receiving device acquires the original signal of the first sub-carrier signal according to the first sub-carrier signal and the M pieces of the first extra-FEC information, the method further includes: The receiving device obtains the original signal of the third subcarrier signal according to the first subcarrier signal and the M pieces of information outside the first FEC. The signal and the second sub-carrier signal are different sub-carrier signals.

It can be seen that, as shown in this aspect, the M pieces of first FEC extra-information and the first sub-carrier signal of the M channels of the second sub-carrier signal are used to assist the decoding of the third sub-carrier signal. It can be seen that in the process of decoding the third subcarrier signal, the interference of the first subcarrier signal and the second subcarrier signal to the third subcarrier signal is effectively suppressed, and the third subcarrier signal is effectively improved. The accuracy with which the signal is decoded.

Based on the first aspect, in an optional implementation manner, before the receiving device acquires the original signal of the third sub-carrier signal according to the first sub-carrier signal and the M pieces of the first extra-FEC information, the method further includes: : the receiving device acquires M fourth cross-correlation coefficients, where the M fourth cross-correlation coefficients are the correlation coefficients between the fourth symbol information and the M second symbol information respectively, and the fourth symbol information is the third sub-symbol information The carrier signal includes at least one symbol, and the M pieces of second symbol information respectively include at least one symbol corresponding to the M pieces of the first extra-FEC information.

It can be seen that, as shown in this aspect, the fourth cross-correlation coefficient can be obtained according to the third sub-carrier signal and the M pieces of first FEC external information, and the fourth cross-correlation coefficient can represent the relationship between the third sub-carrier signal and the second sub-carrier signal. Correlation. Decoding the third subcarrier signal based on the correlation effectively suppresses the interference of the first subcarrier signal and the second subcarrier signal to the third subcarrier signal.

Based on the first aspect, in an optional implementation manner, the receiving device obtains the original signal of the third sub-carrier signal according to the first sub-carrier signal and the M pieces of information outside the first FEC, wherein the receiving device obtains the original signal of the third sub-carrier signal according to the The following formula obtains the original signal of the third subcarrier signal

It can be seen that the receiving device determines that the difference between the fourth symbol information L _e , the fourth target parameter U _i *L _e and the M fifth target parameters is the original signal of the third sub-carrier signal, wherein the first The four target parameters are the product of the fifth cross-correlation coefficient U _i and the fourth symbol information _Le , the fifth cross-correlation coefficient is the correlation coefficient between the fourth symbol information and the third symbol information, the third The symbol information includes at least one symbol corresponding to the second extra-FEC information, where the second extra-FEC information is used to indicate the value of each bit included in the first subcarrier signal, and the M fifth target parameters are the M The products of the second sign information (b ₁ , b ₂ , b ₃ to b _M ) and the M fourth cross-correlation coefficients (V ₁ , V ₂ , V ₃ to _VM ), respectively.

Based on the first aspect, in an optional implementation manner, before the receiving device acquires the original signal of the third sub-carrier signal according to the first sub-carrier signal and the M pieces of the first extra-FEC information, the method further includes: : the receiving device acquires M fifth cross-correlation coefficients, the M fifth cross-correlation coefficients are the correlation coefficients between the third phase information and the M second phase information respectively, and the third phase information is the third sub-phase information The phase of the carrier signal, and the M pieces of second phase information are the phases of the M pieces of information outside the first FEC.

Based on the first aspect, in an optional implementation manner, the receiving device obtains the phase of the original signal of the third subcarrier signal according to the following formula;

It can be known that the receiving device determines the third phase information

The difference with the M sixth target parameters is the phase of the original signal of the third subcarrier signal, wherein the M sixth target parameters are the M fifth cross-correlation coefficients (W ₁ , W ₂ , W ₃ to W _M ) and the M pieces of second phase information (

to

);

The receiving device acquires the original signal of the third sub-carrier signal according to the phase of the original signal of the third sub-carrier signal.

It can be seen that the third sub-carrier signal is decoded based on the correlation of the phase noise between the first sub-carrier signal and the second sub-carrier signal. The accuracy of decoding the third subcarrier signal is effectively improved.

Based on the first aspect, in an optional implementation manner, the difference between the amplitude of the third subcarrier signal sent by the sending device and the amplitude of the third subcarrier signal filtered by the receiving device is greater than or equal to the first A preset value; the difference between the amplitude of the first subcarrier signal sent by the sending device and the amplitude filtered by the receiving device on the first subcarrier signal is less than the first preset value, and the sending device sends the first subcarrier signal. The difference between the amplitude of the second sub-carrier signal and the amplitude of the second sub-carrier signal filtered by the receiving device is smaller than the first preset value.

It can be seen that, as shown in this aspect, the first sub-carrier signal and the second sub-carrier signal, which are completely located in the filtering range of the filter of the receiving device, help the third sub-carrier signal whose amplitude is damaged to be decoded, which effectively improves the damage to the amplitude. The accuracy of decoding the third subcarrier signal.

Based on the first aspect, in an optional implementation manner, the difference between the carrier frequency of each channel of the second subcarrier signal and the carrier frequency of the first subcarrier signal is less than or equal to a second preset value.

It can be seen that the first sub-carrier signal and the second sub-carrier signal shown in this aspect are adjacent, and the first sub-carrier signal and the second sub-carrier signal are subjected to similar interference during the transmission process. The decoding of the first sub-carrier signal is assisted by the second sub-carrier signal, which effectively improves the accuracy of decoding the first sub-carrier signal.

Based on the first aspect, in an optional implementation manner, the difference between the carrier frequency of the first subcarrier signal and the carrier frequency of the third subcarrier signal is less than or equal to a second preset value, and/or , the difference between the carrier frequency of each channel of the second sub-carrier signal and the carrier frequency of the first sub-carrier signal is less than or equal to the second preset value.

It can be seen that the first sub-carrier signal and the second sub-carrier signal adjacent to the third sub-carrier signal with damaged amplitude help the third sub-carrier signal to decode, effectively improving the third sub-carrier with damaged amplitude. The accuracy with which the signal is decoded.

In a second aspect, an embodiment of the present invention provides a network device, including: a processor, a memory, and a receiver interconnected through a line, the memory and the processor are interconnected through a line, and instructions are stored in the memory, and the processor is used for Performing the processing-related method shown in any one of the above-mentioned first aspect, the receiver is configured to perform the receiving-related method shown in any one of the above-mentioned first aspect.

In a third aspect, an embodiment of the present invention provides a processing circuit, where the processing circuit includes a logic circuit and an interface circuit that are connected in sequence. The logic circuit is configured to perform any one of the processing-related steps of the first aspect above. The interface circuit is configured to perform any one of the steps in the first aspect related to receiving a subcarrier signal.

In a fourth aspect, an embodiment of the present invention provides a communication system, including a sending device and a receiving device, where the sending device is configured to send N channels of subcarrier signals to the receiving device, and the receiving device is configured to perform any one of the above-mentioned first aspects method shown.

In a fifth aspect, an embodiment of the present invention provides a computer-readable storage medium, including instructions, when the instructions are run on a computer, the computer causes the computer to execute the method shown in any one of the foregoing first aspects.

In a sixth aspect, an embodiment of the present invention provides a computer program product including instructions, which, when run on a computer, causes the computer to execute the method shown in any one of the above-mentioned first aspect.

With the solution shown in this application, the first sub-carrier signal and the second sub-carrier signal are subjected to similar interference during the transmission process. The receiving device can help decode the first subcarrier signal through M channels of the second subcarrier signal based on the ISI correlation or the phase noise correlation between the first subcarrier signal and the second subcarrier signal. The interference of the second subcarrier signal to the first subcarrier signal is effectively suppressed, and the accuracy of decoding the first subcarrier signal is improved.

If the filter of the receiving device filters the received N-channel sub-carrier signals, the amplitude of the third sub-carrier signal included in the N-channel sub-carrier signals will be damaged. In this embodiment, the first sub-carrier signal and the second sub-carrier signal are used to help decode the third sub-carrier signal, which effectively improves the accuracy of decoding the third sub-carrier signal whose amplitude is damaged.

Description of drawings

1 is a schematic diagram of a structure of a communication system provided by an existing solution;

Fig. 2 is a flow chart of the steps of the first embodiment of the decoding method provided by the application;

FIG. 3 is a structural example diagram of the first embodiment of the receiving device provided by the application;

FIG. 4 is an example spectrum diagram of the first embodiment of N channels of subcarrier signals provided by the application;

FIG. 5 is a flowchart of the steps of the second embodiment of the decoding method provided by the application;

6 is a flowchart of steps of a third embodiment of the decoding method provided by the application;

FIG. 7 is a schematic structural diagram of a second embodiment of the receiving device provided by the application;

FIG. 8 is an example spectrum diagram of the second embodiment of N-channel subcarrier signals provided by the application;

9 is a flowchart of the steps of the fourth embodiment of the decoding method provided by the application;

FIG. 10 is an exemplary structural diagram of an embodiment of the processing circuit provided by the application;

FIG. 11 is a structural example diagram of a third embodiment of the receiving device provided by the present application.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention.

In order to better understand the method provided by this application, the following first describes the communication system to which the decoding method shown in this application is applied.

As shown in FIG. 1 , the communication system shown in this embodiment is a coherent optical fiber communication system, and the communication system includes a sending device 110 and a receiving device 120 .

The sending device 110 is to send N bit streams, that is, the bit streams TXa1, TXa2 to TXaN, to the receiving device 120. The value of N is not limited, for example, N is a positive integer greater than 1.

The sending device 110 includes N FEC encoding modules, namely FEC encoding module 1 , FEC encoding module 2 to FEC encoding module N. The N FEC encoding modules respectively perform FEC encoding on the N bit streams to obtain the encoded N bit streams, that is, the encoded bit streams TXb1, TXb2 to TXbN. For example, the FEC encoding module N independently performs FEC encoding on the bit stream TXaN to obtain the encoded bit stream TXbN.

The sending device includes N digital-to-analog converters respectively connected to the N FEC encoding modules, that is, a digital-to-analog converter 1, a digital-to-analog converter 2 to a digital-to-analog converter N. The N digital-to-analog converters respectively perform digital-to-analog conversion on the N channels of encoded bit streams TXb1, TXb2 to TXbN to obtain N channels of analog signals, that is, the analog signals TXc1, TXc2 to TXcN.

The modulators 111 included in the transmitting device 110 are respectively connected with N digital-to-analog converters. The modulator 111 is used to modulate the received N channels of analog signals TXc1, TXc2 to TXcN to modulate the N sub-carriers.

Specifically, the sending device modulates the N-channel encoded bit streams onto N orthogonal sub-carriers by using a multi-carrier modulation technology. The multi-carrier modulation technology may be orthogonal frequency division multiplexing (orthogonal frequency division multiplex, OFDM) or the like.

The modulator 111 is used to transmit N subcarriers to the receiving device 120 through the optical fiber 130 connected between the transmitting device 110 and the receiving device 120 .

The demodulator 121 included in the receiving device 120 receives N subcarriers from the optical fiber 130 . The demodulator 121 is used to demodulate the N subcarriers respectively to obtain N demodulated bit streams, that is, the demodulated subcarriers RXa1, RXa2 to RXaN.

The receiving device 120 includes N analog-to-digital converters connected to the modulator 121 , ie, analog-to-digital converter 1 , analog-to-digital converter 2 to analog-to-digital converter N. The N analog-to-digital converters respectively perform analog-to-digital conversion on the N channels of demodulated sub-carriers RXa1, RXa2 to RXaN to obtain N channels of digital signals, that is, digital signals RXb1, RXb2 to RXbN.

The receiving device 120 includes a dispersion compensation module 122 connected to the N analog-to-digital converters. The dispersion compensation module 122 is configured to perform dispersion compensation on the N channels of digital signals respectively to obtain the N channels of dispersion compensated signals.

The receiving device 120 includes a polarization compensation module 123 connected to the dispersion compensation module 122 . The polarization compensation module 123 is configured to perform polarization compensation on the N channels of dispersion-compensated signals to obtain N channels of polarization-compensated signals.

The receiving device 120 includes a phase recovery module 124 connected to the polarization compensation module 123 . The phase recovery module 124 is configured to perform phase recovery on the N channels of polarization-compensated signals to obtain N channels of sub-carrier signals, that is, RXc1, RXc2 to RXcN.

The receiving device 120 includes N FEC decoding modules connected to the phase recovery module 124, ie, FEC decoding module 1, FEC decoding module 2 to FEC decoding module N. The N FEC decoding modules are respectively used to perform FEC decoding on the N channels of sub-carrier signals, so as to obtain the original signals of the N channels of sub-carrier signals, that is, the original signals RXd1, RXd2 to RXdN.

It can be seen that the receiving device 120 provided by the existing solution decodes the N channels of subcarrier signals respectively. In the decoding process, the mutual interference between adjacent sub-carrier signals is not considered, which reduces the accuracy of decoding the sub-carrier signals.

In conclusion, the present application provides a decoding method. Using the method shown in this application, in the process of decoding each sub-carrier signal, the receiving device can compensate for the interference between adjacent sub-carrier signals based on the correlation between adjacent sub-carrier signals, thereby The accuracy of decoding the subcarrier signal is effectively improved.

In this application, different decoding methods are adopted based on the correlation between different subcarrier signals. The execution process of the decoding method provided in this embodiment is exemplarily described below with reference to FIG. 2 . The decoding method shown in this embodiment describes the decoding process of each sub-carrier signal based on the correlation of inter-symbol interference (ISI) between different sub-carrier signals:

Step 201: The sending device sends N-channel subcarrier signals to the receiving device.

Refer to FIG. 1 for the description of the process of sending N channels of subcarrier signals by the sending device to the receiving device, and details are not repeated in this embodiment.

Step 202: The receiving device acquires the replica subcarrier signal.

The receiving device shown in this embodiment obtains N channels of replicated sub-carrier signals by duplicating N channels of sub-carrier signals respectively. It can be seen that the N channels of replicated sub-carrier signals are generated by replicating the N channels of sub-carrier signals.

Specifically, the receiving device replicates each symbol included in each sub-carrier signal one by one to generate the replicated sub-carrier signal. It can be seen that the sub-carrier signal and each symbol included in the replicated sub-carrier signal generated by duplicating the sub-carrier signal are the same.

To better understand the method shown in this embodiment, an optional structure of the receiving device shown in this embodiment is described below with reference to FIG. 3 :

The difference between the receiving device shown in FIG. 3 in this embodiment and the receiving device shown in FIG. 1 is that in this embodiment, a calculation unit 300 is newly added between the phase recovery module and the FEC decoding module. It should be clear that the description of the structure of the receiving device in this embodiment is an example, which is only used to facilitate understanding of the execution process of the method shown in this embodiment, and is not intended to limit the structure of the receiving device.

This embodiment does not limit the specific implementation manner of the computing unit 300 . For example, the computing unit 300 may be a chip or an integrated circuit. The computing unit 300 can also be a processing device, and the functions of the processing device can be partially or completely implemented by software. The computing unit 300 at this time may include a memory and a processor, wherein the memory is used to store computer programs, and the processor reads and executes the computer programs stored in the memory, so as to execute the corresponding program executed by the computing unit 300 shown in this embodiment. Processes and/or Steps. Optionally, the computing unit 300 may only include a processor, the memory for storing the computer program is located outside the computing unit 300, and the computing unit 300 is connected with the memory through a circuit/wire to read and execute the computer program stored in the memory. Optionally, the functions of the computing unit 300 may be partially or completely implemented by hardware. At this time, the computing unit 300 may include an input interface circuit, a logic circuit and an output interface circuit.

In this embodiment, the computing unit 300 includes N replica modules connected to the phase recovery module, namely replica module 1 , replica module 2 to replica module N. The computing unit 300 further includes a processing module 301 connected to the N FEC decoding modules. N cache modules, ie, cache module 1 , cache module 2 to cache module N, are connected between the processing module 301 and the N replication modules.

In this embodiment, the N replication modules are respectively used for replicating N channels of subcarrier signals to generate N channels of replicated subcarrier signals, that is, replicated subcarrier signals cp1, cp2 to cpN. For example, if the subcarrier signal is RXc1, the replication module 1 replicates the RCx1 to generate the first replicated subcarrier signal cp1.

The N replication modules respectively transmit the output N-channel replicated sub-carrier signals to the N buffer modules for buffering. For example, the replication module 1 transmits the first replicated sub-carrier signal cp1 to the buffer module 1 . The buffering module 1 buffers the first replicated sub-carrier signal cp1.

The N replica modules transmit the N channels of subcarrier signals from the phase recovery module to the processing module 301 . The processing module 301 then transmits the N sub-carrier signals to the N FEC decoding modules respectively. For example, the processing module 301 transmits the subcarrier signal RXc1 from the replication module 1 to the FEC decoding module 1 .

Step 203: The receiving device performs FEC decoding on the N channels of sub-carrier signals respectively to obtain out-of-FEC information.

In this embodiment, the N FEC decoding modules included in the receiving device respectively perform FEC decoding on the N channels of subcarrier signals, and the N FEC decoding modules can output N pieces of extra-FEC information.

The N FEC decoding modules can output FEC extra-FEC information corresponding to the N sub-carrier signals respectively after the N FEC decoding modules respectively perform the FEC decoding process on the N sub-carrier signals. Wherein, the out-of-FEC information corresponding to each sub-carrier signal is the value of each symbol included in each sub-carrier signal. The value condition may be the value of each symbol included in the subcarrier signal, and the probability corresponding to each value.

For example, for the subcarrier signal RXc1, each symbol included in the subcarrier signal RXc1 is c1 c2 c3 c4 . . . The FEC decoding module 1 performs FEC decoding on the subcarrier signal RXc1 to output the values of each symbol in c1 c2 c3 c4... and the corresponding probability of each value. For example, the probability that the symbol c1 takes the value of "0", the probability that the symbol c1 takes the value of "1".

The value condition may also be the value of the symbol grouping included in the subcarrier signal, and the probability corresponding to each symbol grouping. Wherein, the symbol grouping includes two or more consecutive symbols in the subcarrier signal. This embodiment does not limit the number of symbols included in the symbol grouping.

For example, for the sub-carrier signal RXc1, each symbol included in the sub-carrier signal RXc1 is c1 c2 c3 c4 . . . The FEC decoding module 1 performs FEC decoding on the subcarrier signal RXc1 to output the value of the symbol group and the corresponding probability. Specifically, the symbol grouping may include two consecutive symbols included in the subcarrier signal, such as {c1 c2}. The FEC extrinsic information corresponding to the symbol grouping can be the probability that {c1 c2} is "00", the probability that {c1 c2} is "01", the probability that {c1 c2} is "10", and { The probability that c1 c2} is "11".

It should be made clear that the above description of the out-of-FEC information is an optional example, which is not specifically limited, as long as the out-of-FEC information can reflect the value of each symbol included in the corresponding subcarrier signal.

The method shown in this embodiment can utilize the correlation between adjacent subcarrier signals to improve the accuracy of FEC decoding for N channels of subcarrier signals. To this end, the receiving device shown in this embodiment needs to determine the first sub-carrier signal and the M-channel second sub-carrier signal among the N channels of sub-carrier signals.

Wherein, the first sub-carrier signal shown in this embodiment is any one of the N sub-carrier signals as an example for illustrative description. The second sub-carrier signal is a sub-carrier signal adjacent to the first sub-carrier signal among the N sub-carrier signals. This embodiment does not limit the specific value of M, as long as M is a positive integer greater than or equal to 1, and M is less than N.

In this embodiment, M channels of second sub-carrier signals can be used to assist in decoding the first sub-carrier signal, so that the correlation between the second sub-carrier signal and the first sub-carrier signal can be used to suppress the effect of the second sub-carrier signal on the first sub-carrier signal. The purpose of the interference of one subcarrier is to effectively improve the accuracy of decoding the first subcarrier signal.

In order to realize the purpose of assisting the decoding of the first subcarrier signal by the M channels of the second subcarrier signal, the relationship between the first subcarrier signal and the second subcarrier signal is first described below:

This embodiment is exemplified by taking an example that the second sub-carrier signal and the first sub-carrier signal are adjacent in N sub-carrier signals. It should be clearly stated that the description of the relationship between the first subcarrier signal and the second subcarrier signal in this embodiment is an optional example, which is not limited. In other examples, the second subcarrier signal may be is any sub-carrier signal that is different from the first sub-carrier signal among the N channels of sub-carrier signals.

The following is an exemplary description of the adjacentness of the first sub-carrier signal and the second sub-carrier signal with reference to FIG. 4 . Wherein, FIG. 4 is a diagram of an example spectrum including N channels of subcarrier signals. The abscissa of the sample spectrum diagram represents the magnitude of the carrier frequency of each sub-carrier signal. The ordinate of the spectrum example diagram represents the magnitude of the amplitude of each sub-carrier signal.

This embodiment does not limit the specific value of N. In the example spectrum diagram shown in FIG. 4 , the N channels of sub-carrier signals are arranged in order of carrier frequency from small to large. The first subcarrier signal shown in this embodiment may be the subcarrier signal 401 shown in FIG. 4 , and the second subcarrier signals adjacent to the first subcarrier signal 401 may be 402 , 403 and 404 .

It can be known that the second sub-carrier signal 404, the first sub-carrier signal 401, the second sub-carrier signal 402 and the second sub-carrier signal 403 are sorted in descending order of carrier frequency.

If the second sub-carrier signal is adjacent to the first sub-carrier signal, the difference between the carrier frequency of each channel of the second sub-carrier signal and the carrier frequency of the first sub-carrier signal is less than or equal to the second preset set value. This embodiment does not limit the size of the second preset value, as long as the difference between the carrier frequency of the second subcarrier signal and the carrier frequency of the first subcarrier signal is less than or equal to the second preset value In the case of , the second sub-carrier signal can improve the decoding accuracy of the first sub-carrier signal.

The reason why the accuracy of decoding the first sub-carrier signal can be improved by using the second sub-carrier signal is described below:

It can be understood that N channels of subcarrier signals are transmitted between the sending device and the receiving device shown in this embodiment. Since the transmission of the N channels of sub-carrier signals experiences the same transmission equipment, optical fibers, and receiving devices, the interference experienced by the N channels of sub-carrier signals is similar.

Moreover, among the N channels of sub-carriers, two sub-carrier signals whose carrier frequencies are closer in magnitude will experience more similar interference conditions. As shown in this embodiment, in the case where the interference between the first sub-carrier signal and the second sub-carrier signal is similar, the receiving device can use the first extra-FEC information output after FEC decoding of the second sub-carrier signal to improve the The specific process of performing FEC decoding on the first subcarrier signal is shown in the following steps.

Step 204: The receiving device acquires the first symbol information R _i .

Specifically, the receiving device determines that the first subcarrier signal is the ith subcarrier signal in the N subcarrier signals, that is, RXci. Wherein, the i is a positive integer greater than or equal to 1, and i is less than or equal to N.

The receiving device acquires the first replica sub-carrier signal cpi that is the same as the first sub-carrier signal RXci, and determines the first replica sub-carrier signal cpi as the target sub-carrier signal for performing FEC decoding on the first sub-carrier signal RXci.

The receiving device determines that the symbol included in the target subcarrier signal cpi is the first symbol information R _i .

As shown in FIG. 3 , if the first sub-carrier signal is RXci, the processing module 301 obtains the duplicate sub-carrier signal cpi that is the same as the first sub-carrier signal RXci and stored in the buffer module i. The processing module 301 determines that the copied sub-carrier signal cpi is the target sub-carrier signal. The processing module 301 determines that all symbols included in the target subcarrier signal cpi are the first symbol symbol information R _i .

Step 205: The receiving device acquires the first target parameter.

The first target parameter shown in this embodiment is used to indicate the situation of mutual interference between symbols included in the first subcarrier signal. The following describes the specific process for the receiving device to obtain the first target parameter:

First, the receiving apparatus determines the third symbol information a _i .

Specifically, the first subcarrier signal RXci determined by the receiving device is the i-th subcarrier signal in the N subcarrier signals. The receiving device determines that among the N FEC decoding modules, the extra-FEC information output by the FEC decoding module for FEC decoding the i-th sub-carrier signal (the first sub-carrier signal) is the second extra-FEC information.

The receiving device converts the second extra-FEC information, so as to convert each bit included in the second extra-FEC information into corresponding symbols. The receiving apparatus determines that the third symbol information a _i includes respective symbols converted by respective bits included in the second extra-FEC information.

For example, among the N decoding modules included in the receiving device, the FEC decoding module i is configured to perform FEC decoding on the first subcarrier signal RXci. The processing module 301 determines that the extra-FEC information output by the FEC decoding module i is the second extra-FEC information.

The processing module 301 converts each bit included in the second extra-FEC information into each corresponding symbol. The processing module 301 determines that each symbol converted by the second extra-FEC information is the third symbol information a _i .

Second, the receiving device acquires the second cross-correlation coefficient X _i .

Specifically, the receiving device performs a correlation operation on the first symbol information and the third symbol information to obtain the second cross-correlation coefficient X _i . It can be seen that the second cross-correlation coefficient is used to indicate the degree of correlation between the first symbol information and the third symbol information.

The specific operation manner of the correlation operation is not limited in this embodiment, as long as the second cross-correlation coefficient X _i can indicate the degree of correlation between the first symbol information and the third symbol information.

Again, the receiving device acquires the first target parameter.

The receiving device shown in this embodiment may acquire the first target parameter based on Formula 1, where the first target parameter is used to compensate for interference between symbols included in the first subcarrier signal Rxci.

Formula 1: First target parameter=a _i *X _i .

Based on the formula 1, it can be understood that the first target parameter shown in this embodiment is the product of the second cross-correlation coefficient X _i and the first symbol information a _i .

Step 206: The receiving device acquires M second target parameters.

The second target parameter shown in this embodiment is used to compensate for the interference between the first subcarrier signal and the second subcarrier signal. The following describes the specific process for the receiving device to obtain the second target parameter:

First, the receiving device determines M channels of second subcarrier signals among the N channels of subcarrier signals. For a specific description of the M channels of second subcarrier signals, please refer to step 203 for details, and details will not be repeated.

Second, the receiving device determines M pieces of second symbol information.

The M pieces of second symbol information shown in this embodiment are b ₁ , b ₂ , b ₃ to b _M . The M pieces of second symbol information respectively include at least one symbol corresponding to the M pieces of the first extra FEC information.

Specifically, the receiving device determines that among the N FEC decoding modules, the M pieces of FEC extra information output by the M FEC decoding modules for performing FEC decoding on the M channels of second subcarrier signals are the M pieces of first FEC extra information.

The receiving device converts the M pieces of first extra-FEC information respectively, so as to convert each bit included in each first extra-FEC information into a corresponding symbol. The receiving device acquires corresponding M pieces of second symbol information, that is, b ₁ , b ₂ , and b ₃ to b _M , according to the M pieces of first extra-FEC information.

For example, among the N decoding modules included in the receiving device, the FEC decoding module M is configured to perform FEC decoding on the Mth second subcarrier signal RXcM in the M second subcarrier signals. The processing module 301 determines that the extra-FEC information output by the FEC decoding module M is the first extra-FEC information. The processing module 301 converts each bit included in the first extra-FEC information into a corresponding symbol. The processing module 301 determines that the symbol converted by the first extra-FEC information is the second symbol information b _M .

Again, the receiving device acquires M first cross-correlation coefficients.

Specifically, the receiving device performs a correlation operation on the first symbol information and the M pieces of second symbol information to obtain M first cross-correlation coefficients, that is, Y ₁ , Y ₂ , Y ₃ to Y _M . The M first cross-correlation coefficients are used to indicate the degree of correlation between the first symbol information and the second symbol information respectively.

For example, the first cross-correlation coefficient Y ₁ is used to indicate the degree of correlation between the first symbolic information and the second symbolic information b ₁ , and so on, the first cross-correlation coefficient Y _M is used to indicate the first symbolic information and the second symbolic information b 1. The degree of correlation between the two-symbol information b _M .

Again, the receiving device acquires M second target parameters.

The M second target parameters shown in this embodiment are used to compensate for the interference between the first subcarrier signal and the M second subcarrier signals. Specifically, the M second target parameters shown in this embodiment are the M second symbol information (b ₁ , b ₂ , b ₃ to b _M ) and the M first cross-correlation coefficients (Y ₁ ) respectively. , Y ₂ , Y ₃ to Y _M ).

Step 207: The receiving device acquires the original signal of the first subcarrier signal.

Specifically, the receiving device shown in this embodiment can obtain the original information R _i ^* of the first subcarrier signal according to Formula 2 shown below.

Formula 2:

It can be seen that the original information R _i ^* of the first subcarrier signal is the first symbol information, and the difference between the first target parameter and the M second target parameters is the original signal of the first subcarrier signal.

In this embodiment, in order to improve the accuracy of decoding the first sub-carrier signal, after acquiring the original signal of the first sub-carrier signal, step 203 is returned to. The original signal of the first subcarrier signal is input to the corresponding FEC decoding module. FEC decoding is performed on the first subcarrier signal again. Because the FEC decoding is performed on the first subcarrier signal multiple times, the accuracy of the extra-FEC information output by the FEC decoding module can be effectively improved. It can be seen that by repeatedly performing steps 203 to 207, the accuracy of FEC decoding on the first subcarrier signal is effectively improved based on the more accurate first and second extra-FEC information.

Using the method shown in this embodiment, the first subcarrier signal is decoded based on the ISI correlation relationship between the adjacent first subcarrier signal and the second subcarrier signal. In the process of decoding the first sub-carrier signal, the interference between the second sub-carrier signal and the first sub-carrier signal is effectively suppressed, thereby realizing compensation for the interference of the first sub-carrier signal, thereby The accuracy of decoding the subcarrier signal is effectively improved.

The execution process of the decoding method provided in this embodiment is exemplarily described below with reference to FIG. 5 . Wherein, the decoding method shown in this embodiment describes the decoding process of each sub-carrier signal based on the correlation of phase noise between different sub-carrier signals:

Step 501: The sending device sends N channels of subcarrier signals to the receiving device.

Step 502: The receiving device acquires the duplicated subcarrier signal.

Step 503: The receiving device performs FEC decoding on the N-channel sub-carrier signals respectively to obtain out-of-FEC information.

For the description of the execution process of steps 501 to 503 shown in this embodiment, please refer to steps 201 to 203 shown in FIG. 2 for details, and details are not repeated in this embodiment.

Step 504: The receiving device acquires the first phase information.

The first phase information shown in this embodiment

is the phase of the target subcarrier signal. The target sub-carrier signal shown in this embodiment is the sub-carrier signal cpi generated by duplicating the first sub-carrier signal Rxci. For a specific description of the target sub-carrier signal, please refer to FIG. 2 for details. Step 204 is shown, and details are not repeated.

Step 505: Receive M third cross-correlation coefficients of the device.

The specific process of acquiring the M third cross-correlation coefficients by the receiving device is described below:

First, the receiving device obtains M pieces of first FEC extra-information corresponding to the M pieces of second subcarrier signals. For the specific description of the M pieces of first FEC extra-information, please refer to step 205 shown in FIG. 2 for details. Repeat.

Secondly, the receiving device obtains M pieces of second phase information, that is,

to

Wherein, the M pieces of second phase information are the phases of the M pieces of first extra-FEC information respectively.

Again, the receiving device acquires M third cross-correlation coefficients.

The M third cross-correlation coefficients are the first phase information

respectively and M second phase information (ie

to

) correlation coefficient.

Specifically, the receiving device interprets the first phase information

A correlation operation is performed with the M pieces of second phase information to obtain M third cross-correlation coefficients, namely Z ₁ , Z ₂ , Z ₃ to Z _M . For the description of the related operation, please refer to FIG. 2 in detail, and details will not be repeated.

It can be understood that the M third cross-correlation coefficients are used to indicate the first phase information

respectively and the degree of correlation between the second phase information.

For example, the third cross-correlation coefficient Z ₁ is used to indicate the first phase information

and the second phase information

The degree of correlation between , and so on, the third cross-correlation coefficient Z _M is used to indicate the first phase information

and the second phase information

degree of correlation between.

Step 506: The receiving device acquires M third target parameters.

The third target parameter shown in this embodiment is used to compensate for the interference between the first subcarrier signal and the M second subcarrier signals.

Specifically, the M third target parameters are M third cross-correlation coefficients (Z ₁ , Z ₂ , Z ₃ to Z _M ) and M second phase information (

to

) between the .

Step 507: The receiving device acquires the phase of the original signal of the first subcarrier signal.

Specifically, the receiving device shown in this embodiment can obtain the phase of the original information of the first subcarrier signal according to the following formula 3

Formula 3:

It can be seen that the phase of the original information of the first subcarrier signal

equal to the first phase information

difference from the M third target parameters.

Step 508: The receiving device acquires the original signal of the first subcarrier signal.

In this embodiment, the receiving device obtains the phase of the original signal of the first subcarrier signal

case, the receiving device converts the phase of the original signal of the first sub-carrier signal

Converted to the original signal of the first subcarrier signal.

In this embodiment, in order to improve the accuracy of decoding the first sub-carrier signal, after the original signal of the first sub-carrier signal is acquired, step 503 is returned to. The original signal of the first subcarrier signal is input to the corresponding FEC decoding module. FEC decoding is performed on the first subcarrier signal again. Because the FEC decoding is performed on the first subcarrier signal multiple times, the accuracy of the FEC extra-FEC information output by the FEC decoding can be effectively improved. It can be seen that performing steps 503 to 508 through multiple iterations, based on the more accurate first sub-carrier signal. The extra-FEC information and the second extra-FEC information effectively improve the accuracy of decoding the first subcarrier signal.

Using the method shown in this embodiment, the first sub-carrier signal is decoded based on the phase noise correlation between the adjacent first sub-carrier signal and the second sub-carrier signal. In the process of decoding the first sub-carrier signal, the interference between the second sub-carrier signal and the first sub-carrier signal is effectively suppressed, so as to realize the compensation for the interference of the first sub-carrier signal, thereby realizing the compensation of the interference of the first sub-carrier signal. The accuracy of decoding the subcarrier signal is effectively improved.

If the filter of the receiving device filters the N-channel sub-carrier signals, the amplitude of one or more sub-carrier signals in the N-channel sub-carrier signals will be damaged. If decoding is performed on a sub-carrier signal whose amplitude is impaired, the accuracy of decoding the sub-carrier signal will be reduced. However, the embodiment shown in FIG. 6 can decode sub-carrier signals with impaired amplitude based on the ISI correlation between different sub-carrier signals, which effectively improves the decoding of sub-carrier signals with impaired amplitude. accuracy.

Step 601: The sending device sends N sub-carrier signals to the receiving device.

For the execution process of step 601 shown in this embodiment, please refer to step 201 shown in FIG. 2 for details, and the specific execution process will not be repeated in this embodiment.

Step 602: The receiving device generates a duplicated subcarrier signal by duplicating the first subcarrier signal and the second subcarrier signal.

The difference between this embodiment and the embodiment shown in FIG. 2 is that the receiving device shown in this embodiment does not duplicate each sub-carrier signal to generate a duplicate sub-carrier signal. That is, the duplicated sub-carrier signal shown in this embodiment is generated only by duplicating the first sub-carrier signal and the second sub-carrier signal, without duplicating the third sub-carrier signal.

To better understand the method shown in this embodiment, an optional structure of the receiving device shown in this embodiment is described below with reference to FIG. 7 :

The difference between the receiving device shown in FIG. 7 in this embodiment and the receiving device shown in FIG. 3 is that in the computing unit 700 shown in this embodiment, which is connected between the phase recovery module and the FEC decoding module, the first subcarrier signal and the transmission path of the second subcarrier signal includes a replication module for performing replication. For the specific description of the replication module, please refer to Fig. 3, and details will not be repeated. However, in the computing unit 700, the transmission path of the third subcarrier signal does not include a copying module for copying.

For example, the buffering module 1 shown in FIG. 7 is used for buffering the third sub-carrier signal RXc1, and the buffering module N is used for buffering the third sub-carrier signal RXc1. It can be seen that in the computing unit 700, the transmission path of the third subcarrier signal RXc1 does not include a copy module.

In the computing unit 700, a replication module is included in the transmission paths of the first subcarrier signal and the second subcarrier signal. An exemplary description is given by taking the sub-carrier signal RXci as the first sub-carrier signal as an example. The copying module i included in the computing unit 700 is used for copying the first sub-carrier signal RXci to generate the copied sub-carrier signal cpi.

The copying module i transmits the copied sub-carrier signal cpi to the buffering module i for buffering. For the specific description of the replication module, the cache module, and the processing module 701 in this embodiment, please refer to the embodiment shown in FIG. 3 , and details are not repeated.

It should be clear that the description of the structure of the receiving device in this embodiment is an example, which is only used to facilitate understanding of the execution process of the method shown in this embodiment, and is not intended to limit the structure of the receiving device.

The third subcarrier signal is described below:

In the example spectrum diagram shown in FIG. 8 , the N channels of sub-carrier signals are arranged in order of carrier frequency from small to large. For details, please refer to FIG. 4 , which will not be repeated.

The difference between the example spectrum diagram shown in FIG. 8 and the example spectrum diagram shown in FIG. 4 is that the example spectrum diagram of N channels of subcarriers shown in FIG. 8 is an example spectrum diagram after filtering by the filter of the receiving device.

The area 800 shown in FIG. 8 is used to indicate the filtering range of the filter of the receiving device. It can be seen that for the sub-carrier signals 801 , 802 , 803 and 804 , the sub-carrier signal 802 and the sub-carrier signal 803 are completely located in the region 800 . Taking the subcarrier signal 802 as an example, when the subcarrier signal 802 is completely within the filtering range of the filter, the difference between the amplitude of the subcarrier signal 802 before filtering by the filter and the amplitude after filtering by the filter smaller. It can be seen that through the filtering by the filter, the amplitude of the sub-carrier signal 802 will not be damaged.

In this embodiment, the sub-carrier signal completely within the filtering range of the filter is taken as an example that the sub-carrier signal is the first sub-carrier signal or the second sub-carrier signal for illustration. It can be known that the difference between the amplitude of the first sub-carrier signal sent by the sending device and the amplitude of the first sub-carrier signal filtered by the receiving device is smaller than the first preset value. The difference between the amplitude of the second sub-carrier signal sent by the sending device and the amplitude of the second sub-carrier signal filtered by the receiving device is smaller than the first preset value.

This embodiment does not limit the size of the first preset value. As long as the difference between the amplitude of the subcarrier signal before filtering and the amplitude after filtering is smaller than the first preset value, the The carrier signal only needs to be within the filtering range of the filter.

However, the sub-carrier signals 801 and 804 shown in FIG. 8 are not completely within the filtering range 800 of the filter. Taking the sub-carrier signal 801 as an example, if the sub-carrier signal 801 is not completely within the filtering range of the filter, the difference between the amplitude of the sub-carrier signal 801 before filtering by the filter and the amplitude after filtering by the filter larger value. It can be seen that through the filtering of the filter, the amplitude of the sub-carrier signal 801 is damaged.

In this embodiment, the sub-carrier signal that is not completely within the filtering range of the filter is taken as an example for the third sub-carrier signal for illustrative description. It can be known that the difference between the amplitude of the third subcarrier signal sent by the sending device and the amplitude of the third subcarrier signal filtered by the receiving device is greater than or equal to the first preset value.

This embodiment exemplarily describes the relationship between the first subcarrier signal, the second subcarrier signal, and the third subcarrier signal in the N channels of subcarrier signals:

It should be clear that, in this embodiment, the description of the relationship between the first subcarrier signal, the second subcarrier signal, and the third subcarrier signal is an optional example, which is not limited, as long as the third subcarrier signal is incomplete. The first sub-carrier signal and the second sub-carrier signal may be any two sub-carrier signals that are completely within the filtering range of the filter.

The first subcarrier signal and the third subcarrier signal shown in this embodiment are adjacent to each other. It can be known that the difference between the carrier frequency of the first sub-carrier signal and the carrier frequency of the third sub-carrier signal is less than or equal to the second preset value. For a specific description, please refer to FIG. 2 for the description that the second sub-carrier signal is adjacent to the first sub-carrier signal, and details are not repeated.

The third subcarrier signal shown in this embodiment is adjacent to the second subcarrier signal. It can be known that the difference between the carrier frequency of the third sub-carrier signal and the carrier frequency of the second sub-carrier signal is less than or equal to the second preset value. For a specific description, please refer to FIG. 2 for the description that the second sub-carrier signal is adjacent to the first sub-carrier signal, and details are not repeated.

The first subcarrier signal and the second subcarrier signal shown in this embodiment are also adjacent subcarrier signals. For the description of the adjacentness of the first subcarrier signal and the second subcarrier signal, please refer to FIG. 2 for details. The illustrated embodiment is not described in detail in this embodiment.

It should be clear that, in other examples, the third sub-carrier signal may also be adjacent to only the first sub-carrier signal, but not adjacent to the second sub-carrier signal. For another example, the third sub-carrier signal may also be adjacent to the second sub-carrier signal only, but not adjacent to the first sub-carrier signal.

It can be seen from the above description that the third sub-carrier signal is not completely within the filtering range of the filter, which causes the amplitude of the third sub-carrier signal to be damaged before and after filtering. It can be seen that, if the FEC decoding module directly performs FEC decoding on the third subcarrier signal, the accuracy of the FEC decoding on the third subcarrier signal will be reduced.

However, in this embodiment, the decoding of the third sub-carrier signal whose amplitude is impaired is assisted by the first sub-carrier signal and the second sub-carrier signal. The accuracy of decoding the third subcarrier signal is effectively improved. For the process of helping the first subcarrier signal to perform FEC decoding by using the first subcarrier signal and the second subcarrier signal, please refer to the following steps for details.

Step 603: The receiving device performs FEC decoding on the first subcarrier signal and the second subcarrier signal respectively to obtain extra-FEC information.

It can be known from step 602 that the receiving device does not duplicate the third sub-carrier signal, and the receiving device does not perform FEC decoding on the third sub-carrier signal. Continuing as shown in FIG. 7 , for the third sub-carrier signal RXc1, the buffering module 1 buffers the third sub-carrier signal RXc1. The processing module 701 will not transmit the third subcarrier signal RXc1 to the FEC decoding module 1 for FEC decoding.

For the first sub-carrier signal and the second sub-carrier signal, the receiving device will copy them and send them to the corresponding FEC decoding module for FEC decoding. For the description of the specific process, please refer to step 203 in FIG. 2 for details. , and do not go into details.

Step 604: The receiving device acquires fourth symbol information _Le .

Specifically, when the receiving device determines that the e-th sub-carrier signal in the N-channel sub-carrier signals is the third sub-carrier signal Rxce, it acquires the third sub-carrier signal Rxce from the buffer module. This embodiment does not limit the value of e, as long as e is a positive integer greater than or equal to 1, and e is less than or equal to N.

It can be seen from the above that the calculation unit 700 does not copy the third subcarrier signal Rxce, but directly stores the third subcarrier signal Rxce in the buffer module e. In step 604, the processing module 701 can directly read the third subcarrier signal Rxce from the buffer module e.

The processing module 701 determines that the symbol included in the third subcarrier signal _Rxce is the fourth symbol information Le.

Step 605: The receiving device acquires the fourth target parameter.

The fourth target parameter shown in this embodiment is used to indicate the interference situation between the first subcarrier signal and the third subcarrier signal. The following describes the specific process for the receiving device to obtain the fourth target parameter:

First, the receiving apparatus determines the third symbol information a _i .

For example, among the N decoding modules included in the receiving device, the FEC decoding module i is configured to perform FEC decoding on the first subcarrier signal RXci. The processing module 701 determines that the extra-FEC information output by the FEC decoding module i is the second extra-FEC information.

The processing module 701 converts each bit included in the second extra-FEC information into corresponding symbols. The processing module 701 determines that each symbol converted by the second extra-FEC information is the third symbol information a _i .

Second, the receiving device obtains the fifth cross-correlation coefficient U _i .

Specifically, the receiving device performs a correlation operation on the fourth symbol information Le and the third symbol information a _i to obtain the fifth cross-correlation coefficient U _i _. It can be seen that the fifth cross-correlation coefficient U _i is used to indicate the degree of correlation between the fourth symbol information _{Le and the third symbol information a i} _. For the specific description of the related operations, please refer to the embodiment shown in FIG. 2 in detail, and details are not repeated in this embodiment.

Again, the receiving device obtains the fourth target parameter.

The receiving device shown in this embodiment can acquire the fourth target parameter based on formula 4.

Formula 4: Fourth target parameter=U _i *L _e .

Based on the formula 4, it can be understood that the fourth target parameter shown in this embodiment is the product of the fifth cross-correlation coefficient U _i and the fourth symbol information _Le .

Step 606: The receiving device acquires M fifth target parameters.

The fifth target parameter shown in this embodiment is used to compensate for the interference between the third subcarrier signal and the second subcarrier signal. The following describes the specific process for the receiving device to obtain the fifth target parameter:

Second, the receiving device determines M pieces of second symbol information.

The M pieces of second symbol information shown in this embodiment are b ₁ , b ₂ , b ₃ to b _M . The M pieces of second symbol information respectively include at least one symbol corresponding to the M pieces of the first extra FEC information. For a specific description of the M pieces of second symbol information, please refer to step 206 shown in FIG. 2 for details, and details are not repeated in this embodiment.

Again, the receiving device acquires M fourth cross-correlation coefficients.

Specifically, the receiving device performs a correlation operation on the fourth symbol information and the M pieces of second symbol information to obtain _M fourth cross-correlation coefficients, namely V ₁ , V ₂ , V ₃ to VM . The M fourth cross-correlation coefficients are used to indicate the degree of correlation between the fourth symbol information and the second symbol information respectively.

For example, the fourth cross-correlation coefficient V ₁ is used to indicate the degree of correlation between the fourth sign information _Le and the second sign information b ₁ , and so on, the fourth cross-correlation coefficient V _M is used to indicate the fourth sign information The degree of correlation between _Le and the second symbol information b _M.

Again, the receiving device acquires M fifth target parameters.

The M fifth target parameters shown in this embodiment are the M second symbol information (b ₁ , b ₂ , b ₃ to b _M ) and the M fourth cross-correlation coefficients (V ₁ , V ₂ ) respectively , V ₃ to _VM ).

Step 607: The receiving device acquires the original signal of the third subcarrier signal.

In this embodiment, the fourth target parameter obtained in step 605 is obtained by processing according to the third subcarrier signal. The M fifth target parameters shown in step 606 are obtained by processing the M channels of the second subcarrier signal and the third subcarrier signal. In this embodiment, the fourth target parameter and the M fifth target parameters can be used to implement the FEC decoding of the third subcarrier signal, so as to improve the accuracy of the FEC decoding of the third subcarrier signal.

Specifically, the receiving device shown in this embodiment can obtain the original information _Le ^* of the third subcarrier signal according to Formula 5 shown below.

Formula 5:

It can be seen that the original information L _e ^* of the third sub-carrier signal is the fourth symbol information, and the difference between the fourth target parameter and the M fifth target parameters is the original signal of the third sub-carrier signal.

In this embodiment, in order to improve the accuracy of decoding the third subcarrier signal, after the original signal of the third subcarrier signal is acquired, step 603 is returned to. By performing steps 603 to 607 through multiple iterations, the accuracy of decoding the third subcarrier signal is effectively improved based on the more accurate first and second extra-FEC information.

Using the method shown in this embodiment, the third sub-carrier signal whose amplitude is impaired is decoded based on the ISI correlation between the adjacent first sub-carrier signal and the second sub-carrier signal. In the process of decoding the third sub-carrier signal, the second external FEC signal corresponding to the first sub-carrier signal and the first external FEC information corresponding to the second sub-carrier signal are used, thereby effectively improving the first FEC signal with damage to the amplitude. The accuracy of decoding three subcarrier signals.

The execution process of the decoding method provided by this embodiment is exemplarily described below with reference to FIG. 9 . The decoding method shown in this embodiment describes the decoding process of the third subcarrier signal whose amplitude is impaired based on the correlation of phase noise between the first subcarrier signal and the second subcarrier signal. For a specific description of the third sub-carrier signal whose amplitude is impaired, please refer to the embodiment shown in FIG. 6 for details, and details are not repeated in this embodiment.

Step 901: The sending device sends N channels of subcarrier signals to the receiving device.

Step 902: The receiving device generates a duplicated subcarrier signal by duplicating the first subcarrier signal and the second subcarrier signal.

Step 903: The receiving device performs FEC decoding on the first sub-carrier signal and the second sub-carrier signal respectively to obtain extra-FEC information.

For the description of the execution process of steps 901 to 903 shown in this embodiment, please refer to steps 601 to 603 shown in FIG. 6 for details, and details are not repeated in this embodiment.

Step 904: The receiving device acquires third phase information.

The third phase information shown in this embodiment

is the phase of the third subcarrier signal.

Specifically, when the receiving device determines that the e-th sub-carrier signal in the N-channel sub-carrier signals is the third sub-carrier signal Rxce, it acquires the third sub-carrier signal Rxce from the buffer module.

Referring to the embodiment shown in FIG. 6 , the calculation unit 700 does not copy the third subcarrier signal Rxce, but directly stores the third subcarrier signal Rxce in the buffer module e. In step 904, the processing module 701 can directly read the third subcarrier signal Rxce from the buffer module e.

The processing module 701 uses the phase of the third subcarrier signal Rxce as the third phase information

Step 905: The receiving device acquires M fifth cross-correlation coefficients.

The specific process of acquiring the M fifth cross-correlation coefficients by the receiving device is described below:

to

Again, the receiving device acquires M fifth cross-correlation coefficients.

The M fifth cross-correlation coefficients are the third phase information

Correlation coefficients between M pieces of second phase information respectively. Specifically, the receiving device comprehends the third phase information

A correlation operation is performed with the M pieces of second phase information to obtain M fifth cross-correlation coefficients, ie, W ₁ , W ₂ , W ₃ to W _M . For the description of the related operation, please refer to FIG. 2 in detail, and details will not be repeated.

It can be understood that the M fifth cross-correlation coefficients (ie W ₁ , W ₂ , W ₃ to W _M ) are used to indicate the third phase information

For example, the fifth cross-correlation coefficient W ₁ is used to indicate the third phase information

and the second phase information

The degree of correlation between , and so on, the third cross-correlation coefficient W _M is used to indicate the third phase information

and the second phase information

degree of correlation between.

Step 906: The receiving device acquires M sixth target parameters.

The M sixth target parameters shown in this embodiment are the M fifth cross-correlation coefficients (W ₁ , W ₂ , W ₃ to W _M ) and the M second phase information (

to

) between the .

Step 907: The receiving device acquires the phase of the original signal of the third subcarrier signal.

Specifically, the receiving device shown in this embodiment can obtain the phase of the original information of the third subcarrier signal according to the following formula 6

Formula 6:

It can be seen that the phase of the original information of the third subcarrier signal

equal to the third phase information

difference from the M sixth target parameters.

Step 908: The receiving device acquires the original signal of the third subcarrier signal.

In this embodiment, the receiving device obtains the phase of the original signal of the third subcarrier signal

case, the receiving device converts the phase of the original signal of the third sub-carrier signal

Converted to the original signal of the third subcarrier signal.

In this embodiment, in order to improve the accuracy of decoding the third subcarrier signal, after the original signal of the third subcarrier signal is acquired, step 903 is returned to. By performing steps 903 to 908 through multiple iterations, the accuracy of decoding the third subcarrier signal is effectively improved based on the more accurate first and second extra-FEC information.

Using the method shown in this embodiment, the third sub-carrier signal whose amplitude is impaired is decoded based on the phase noise correlation between the adjacent first sub-carrier signal and the second sub-carrier signal. The accuracy of decoding the third subcarrier signal whose amplitude is damaged is effectively improved.

The following describes the structure of the processing circuit provided in the present application for executing any of the embodiments of FIG. 2 , FIG. 5 , FIG. 6 , and FIG. 9 . As shown in FIG. 10 , the processing circuit 1000 shown in this embodiment includes a logic circuit 1001 and an interface circuit 1002 which are connected in sequence.

The logic circuit 1001 performs the processing-related steps shown in any of the embodiments of FIGS. 2 , 5 , 6 and 9 . The interface circuit 1002 is configured to perform the steps related to receiving the sub-carrier signal shown in any of the embodiments of FIG. 2 , FIG. 5 , FIG. 6 and FIG. 9 .

Optionally, the logic circuit 1001 shown in this embodiment may also be called a processor. The interface circuit 1002 can also implement the receiving function by an interface circuit.

The processing device including the processing circuit 1000 shown in this embodiment may be one or more chips, or one or more integrated circuits. For example, the processing device may be one or more field-programmable gate array (FPGA), application specific integrated circuit (ASIC), system on chip (SoC), central processing CPU (central processor unit, CPU), digital signal processing circuit (digital signal processor, DSP), microcontroller (micro controller unit, MCU), programmable logic device (programmable logic device, PLD) or other integrated chips, or the above Any combination of chips or processors, etc.

The specific structure of the network device provided by the present application will be described below with reference to FIG. 11 . As shown in FIG. 11 , the network device 1100 shown in this embodiment is the receiving device shown in FIG. 2 , FIG. 5 , FIG. 6 , and FIG. 9 .

The network device 1100 includes a processor 1101 , a memory 1102 and a receiver 1103 . The processor 1101, the memory 1102 and the receiver 1103 are interconnected by wires. Among them, the memory 1102 is used for storing program instructions and data.

The memory 1102 shown in this embodiment stores processing-related steps performed by the processor 1101 in the steps shown in any of the embodiments of FIG. 2 , FIG. 5 , FIG. 6 , and FIG. 9 . The receiver 1103 is configured to perform the steps related to receiving the sub-carrier signal shown in any of the embodiments of FIG. 2 , FIG. 5 , FIG. 6 and FIG. 9 .

For example, in FIG. 2, the receiver 1103 is configured to receive N channels of subcarrier signals from the transmitting device. The processor 1101 is used to execute steps 202 to 207 .

For another example, in FIG. 5 , the receiver 1103 is configured to receive N channels of subcarrier signals from the transmitting device. The processor 1101 is used to execute steps 502 to 508 .

For another example, in FIG. 6 , the receiver 1103 is configured to receive N channels of subcarrier signals from the transmitting device. The processor 1101 is used to execute steps 602 to 608 .

For another example, in FIG. 9 , the receiver 1103 is configured to receive N channels of subcarrier signals from the transmitting device. The processor 1101 is used to execute steps 902 to 908 .

Based on the above embodiments, embodiments of the present application further provide a computer-readable storage medium, where a software program is stored in the storage medium, and when the software program is read and executed by one or more processors, it can implement any one of the above or Methods provided by various embodiments.

Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present application without departing from the scope of the embodiments of the present application. Thus, if these modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

A decoding method, characterized in that the method comprises:

The receiving device receives N channels of sub-carrier signals, the N channels of sub-carrier signals include one channel of first sub-carrier signals and M channels of second sub-carrier signals, where M is a positive integer greater than or equal to 1, and N is greater than 1 positive integer, and M is less than N;

The receiving device performs forward error correction (FEC) decoding on each channel of the second sub-carrier signal to obtain first extra-FEC information, where the first extra-FEC information is used to indicate the information included in the second sub-carrier signal. The value of each bit;

The receiving device acquires the original signal of the first subcarrier signal according to the first subcarrier signal and the M pieces of the first extra-FEC information.
The method according to claim 1, wherein the obtaining, by the receiving device, the original signal of the first subcarrier signal according to the first subcarrier signal and the M pieces of the first extra-FEC information comprises:

The receiving device acquires a target subcarrier signal, where the target subcarrier signal is generated by duplicating the first subcarrier signal;

The receiving device acquires the original signal of the first sub-carrier signal according to the target sub-carrier signal and the M pieces of the first extra-FEC information.
The method according to claim 2, characterized in that before the receiving device acquires the original signal of the first subcarrier signal according to the target subcarrier signal and the M pieces of first out-of-FEC information, the method Also includes:

The receiving device acquires M first cross-correlation coefficients, where the M first cross-correlation coefficients are correlation coefficients between the first symbol information and M pieces of second symbol information respectively, and the first symbol information is the The target subcarrier signal includes at least one symbol, and the M pieces of second symbol information respectively include at least one symbol corresponding to the M pieces of the first extra-FEC information.
The method according to claim 3, wherein the receiving device obtains the original signal of the first sub-carrier signal according to the target sub-carrier signal and the M pieces of the first extra-FEC information, comprising:

The receiving device determines that the difference between the first symbol information, the first target parameter and the M second target parameters is the original signal of the first subcarrier signal, wherein the first target parameter is the first target parameter. The product between two cross-correlation coefficients and the first sign information, the second cross-correlation coefficient is the correlation coefficient between the first sign information and the third sign information, and the third sign information includes At least one symbol corresponding to the two extra-FEC information, the M second target parameters are the products of the M pieces of second symbol information and the M first cross-correlation coefficients respectively, the second extra-FEC information It is used to indicate the value of each bit included in the first subcarrier signal.
The method according to claim 2, characterized in that before the receiving device acquires the original signal of the first subcarrier signal according to the target subcarrier signal and the M pieces of first out-of-FEC information, the method Also includes:

The receiving device acquires M third cross-correlation coefficients, where the M third cross-correlation coefficients are correlation coefficients between the first phase information and M pieces of second phase information respectively, and the first phase information is the The phase of the target subcarrier signal, and the M pieces of second phase information are respectively the phases of the M pieces of the first extra-FEC information.
The method according to claim 5, wherein the receiving device obtains the original signal of the first sub-carrier signal according to the target sub-carrier signal and the M pieces of the first extra-FEC information, comprising:

The receiving device determines that the difference between the first phase information and the M third target parameters is the phase of the original signal of the first subcarrier signal, wherein the M third target parameters are the a product between the M third cross-correlation coefficients and the M second phase information respectively;

The receiving device acquires the original signal of the first sub-carrier signal according to the phase of the original signal of the first sub-carrier signal.
According to the method according to any one of claims 1 to 6, after the receiving device obtains the original signal of the first subcarrier signal according to the first subcarrier signal and the M pieces of first out-of-FEC information, the The method also includes:

The receiving device obtains the original signal of the third sub-carrier signal according to the first sub-carrier signal and the M pieces of information outside the first FEC, where the third sub-carrier signal is the N sub-carrier signals, and the The first sub-carrier signal and the second sub-carrier signal are different sub-carrier signals.
The method according to claim 7, wherein, before the receiving device acquires the original signal of the third subcarrier signal according to the first subcarrier signal and the M pieces of first extra-FEC information, the The method also includes:

The receiving device acquires M fourth cross-correlation coefficients, where the M fourth cross-correlation coefficients are the correlation coefficients between the fourth symbol information and the M second symbol information respectively, and the fourth symbol information is the The third subcarrier signal includes at least one symbol, and the M pieces of second symbol information respectively include at least one symbol corresponding to the M pieces of the first extra-FEC information.
The method according to claim 8, wherein the receiving device obtains the original signal of the third sub-carrier signal according to the first sub-carrier signal and the M pieces of information outside the first FEC, comprising:

The receiving device determines that the difference between the fourth symbol information, the fourth target parameter, and the M fifth target parameters is the original signal of the third subcarrier signal, wherein the fourth target parameter is the third subcarrier signal. The product of the fifth cross-correlation coefficient and the fourth symbol information, the fifth cross-correlation coefficient is the correlation coefficient between the fourth symbol information and the third symbol information, and the third symbol information includes Two at least one symbol corresponding to extra-FEC information, the second extra-FEC information is used to indicate the value of each bit included in the first subcarrier signal, and the M fifth target parameters are the M A product between the second sign information and the M fourth cross-correlation coefficients, respectively.
The method according to any one of claims 1 to 6, wherein the receiving device acquires the third subcarrier signal according to the first subcarrier signal and the M pieces of information outside the first FEC Before the original signal, the method further includes:

The receiving device acquires M fifth cross-correlation coefficients, where the M fifth cross-correlation coefficients are correlation coefficients between the third phase information and M pieces of second phase information respectively, and the third phase information is the The phase of the third subcarrier signal, and the M pieces of second phase information are respectively the phases of the M pieces of the first extra-FEC information.
The method according to claim 10, wherein the receiving device obtains the original signal of the third sub-carrier signal according to the first sub-carrier signal and the M pieces of information outside the first FEC, comprising:

The receiving device determines that the difference between the third phase information and the M sixth target parameters is the phase of the original signal of the third subcarrier signal, wherein the M sixth target parameters are the products between the M fifth cross-correlation coefficients and the M second phase information respectively;

The receiving device acquires the original signal of the third sub-carrier signal according to the phase of the original signal of the third sub-carrier signal.
The method according to any one of claims 7 to 11, wherein a difference between the amplitude of the third sub-carrier signal sent by the sending device and the amplitude of the third sub-carrier signal filtered by the receiving device The difference is greater than or equal to a first preset value; the difference between the amplitude of the first sub-carrier signal sent by the sending device and the amplitude of the first sub-carrier signal filtered by the receiving device is smaller than the The first preset value, the difference between the amplitude of the second subcarrier signal sent by the sending device and the amplitude of the second subcarrier signal filtered by the receiving device is smaller than the first preset value .
The method according to any one of claims 1 to 12, wherein the difference between the carrier frequency of each channel of the second sub-carrier signal and the carrier frequency of the first sub-carrier signal is less than or equal to the first Two default values.
The method according to any one of claims 7 to 12, wherein the difference between the carrier frequency of the first sub-carrier signal and the carrier frequency of the third sub-carrier signal is less than or equal to the second preset set value, and/or, the difference between the carrier frequency of each channel of the second sub-carrier signal and the carrier frequency of the first sub-carrier signal is less than or equal to the second preset value.
A network device, characterized by comprising: a processor, a memory, and a receiver interconnected by a line, the memory and the processor are interconnected by a line, and instructions are stored in the memory, and the processor is used to execute the 14. The processing-related method of any one of claims 1 to 14, the receiver for performing the receiving-related method of any one of claims 1 to 14.
A communication system, characterized in that it includes a sending device and a receiving device, the sending device is configured to send N-channel subcarrier signals to the receiving device, and the receiving device is configured to perform the decoding described in any one of claims 1 to 14 method.
A computer-readable storage medium comprising instructions which, when executed on a computer, cause the computer to perform the method of any one of claims 1 to 14.