CN114584254A

CN114584254A - Decoding method, network equipment, system and storage medium

Info

Publication number: CN114584254A
Application number: CN202011380992.7A
Authority: CN
Inventors: 卢彦兆; 肖治宇
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2022-06-03
Also published as: WO2022111274A1

Abstract

The embodiment of the invention discloses a decoding method, network equipment, a system and a storage medium, which are used for decoding a first subcarrier signal based on the correlation between the first subcarrier signal and a second subcarrier signal so as to improve the accuracy of decoding the first subcarrier signal, and the method comprises the following steps: receiving N paths of subcarrier signals by receiving equipment, wherein the N paths of subcarrier signals comprise one path of first subcarrier signal and M paths of second subcarrier signals, M is a positive integer greater than or equal to 1, N is a positive integer greater than 1, and M is less than N; the receiving device performs Forward Error Correction (FEC) decoding on each path of the second subcarrier signal to acquire first FEC external information, wherein the first FEC external information is used for indicating the value taking condition of each bit included in the second subcarrier signal; and the receiving device acquires the original signal of the first subcarrier signal according to the first subcarrier signal and the M pieces of first FEC external information.

Description

Decoding method, network equipment, system and storage medium

Technical Field

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

Background

With the increasing demand for network capacity, the traffic of network devices has evolved from 100G to 200G, 400G, and even 800G and beyond. To accommodate the evolution of the traffic of network devices, the development of network devices from single carrier signals to multi-subcarrier signals has been an irreversible trend.

In order to realize the interaction of multiple paths of subcarrier signals between two network devices, the network device serving as a sending device independently performs Forward Error Correction (FEC) coding on each path of subcarrier signals. The network device as the receiving device performs FEC decoding on each sub-carrier signal separately.

Because of the multi-channel subcarrier signals, each channel of subcarrier signals is interfered by adjacent subcarrier signals during the transmission process. However, by means of FEC decoding of the target subcarrier signal by the receiving device alone, interference of other subcarrier signals adjacent to the target subcarrier signal cannot be effectively suppressed, and decoding accuracy is reduced.

Disclosure of Invention

The embodiment of the application provides a decoding method, network equipment, a system and a storage medium, which are used for improving the accuracy of decoding subcarrier signals.

In a first aspect, an embodiment of the present invention provides a decoding method, where the method includes: receiving N paths of subcarrier signals by receiving equipment, wherein the N paths of subcarrier signals comprise one path of first subcarrier signal and M paths of second subcarrier signals, the first subcarrier signal is any one path of the N paths of subcarrier signals, M is a positive integer greater than or equal to 1, N is a positive integer greater than 1, and M is less than N; the receiving device performs forward error correction FEC decoding on each path of the second subcarrier signal to obtain first FEC external information, where the first FEC external information is used to indicate a value of each bit included in the second subcarrier signal; and the receiving device acquires the original signal of the first subcarrier signal according to the first subcarrier signal and the M pieces of first FEC external information.

It can be seen that in the present aspect, the decoding of the first subcarrier signal is assisted by the M pieces of first FEC external information of the M paths of second subcarrier signals. Therefore, 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 obtaining, by the receiving device, an original signal of the first subcarrier signal according to the first subcarrier signal and the M pieces of first FEC extrinsic information includes: the receiving device obtains a target subcarrier signal, which is generated by copying the first subcarrier signal; and the receiving device acquires the original signal of the first subcarrier signal according to the target subcarrier signal and the M pieces of first FEC external information.

As can be seen, the target subcarrier signal can be obtained by copying the first subcarrier signal as shown in this aspect. And then obtaining the correlation between the first subcarrier signal and the second subcarrier signal according to the target subcarrier signal and the M pieces of first FEC external information. The first subcarrier signal is decoded based on the correlation, and the interference of the second subcarrier signal to the first subcarrier signal is effectively suppressed.

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

Therefore, the method and the device can acquire the second FEC external information of the first subcarrier signal, decode the first subcarrier signal through the second FEC external signal and the M pieces of first FEC external information, and effectively improve the accuracy of decoding the first subcarrier signal.

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

As can be seen, 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 subcarrier signal and the second subcarrier signal is effectively obtained, and the accuracy of decoding the first subcarrier signal is improved.

Based on the first aspect, in an optional implementation manner, the obtaining, by the receiving device, an original signal of the first subcarrier signal according to the target subcarrier signal and the M pieces of first FEC external information includes: the receiving device determines that the difference value between the first symbol information, the first target parameter and the M second target parameters is an original signal of the first subcarrier signal;

i.e. according to the formula

Obtaining an original signal R of a first subcarrier signal_i ^*；

Wherein the first target parameter a_i*X_iIs the second cross correlation coefficient X_iAnd the first symbol information a_iThe second cross-correlation coefficient is a correlation coefficient between the first symbol information and third symbol information, the third symbol information includes at least one symbol corresponding to the second FEC outer information, and the M second target parameters are the M second symbol information (b)₁、b₂、b₃To b_M) Respectively with the M first cross correlation coefficients (Y)₁、Y₂、Y₃To Y_M) The product between them.

It can be seen that the first target parameter is used to represent the correlation between different symbols within the first subcarrier signal. And the M second target parameters are respectively used for reflecting the correlation between each path of second subcarrier signal and the first subcarrier signal. According to the method, the first subcarrier signal is decoded based on the correlation relationship of ISI between the first subcarrier signal and the second subcarrier signal, and the accuracy of decoding the first subcarrier signal is effectively improved.

Based on the first aspect, in an optional implementation manner, before the receiving device obtains an original signal of the first subcarrier signal according to the target subcarrier signal and the M pieces of first FEC extrinsic information, the method further includes: the receiving device obtains M third cross correlation coefficients, where the M third cross correlation coefficients are correlation coefficients between first phase information and M second phase information, respectively, the first phase information is a phase of the target subcarrier signal, and the M second phase information is a phase of M pieces of the first FEC external information, respectively.

In this aspect, the receiving device may decode the first subcarrier signal based on the correlation of the phase noise between the first subcarrier signal and the second subcarrier signal, and the accuracy of decoding the first subcarrier signal is effectively improved.

Based on the first aspect, in an optional implementation manner, the obtaining, by the receiving device, an original signal of the first subcarrier signal according to the target subcarrier signal and the M pieces of first FEC external information includes: the receiving device is based on the formula

Obtaining the phase of the original signal

It can be seen that the phase of the original signal

Is the first phase information

The difference between the M third target parameters and the original signal of the first subcarrier signal 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、Z₂、Z₃To Z_M) Respectively with the M second phase information (

To is that

) The product between;

the receiving device obtains the original signal of the first subcarrier signal according to the phase of the original signal of the first subcarrier signal.

It can be seen that the first subcarrier signal is decoded based on the correlation of the phase noise between the first subcarrier signal and the second subcarrier signal. In the process of decoding the first subcarrier signal, the interference between the second subcarrier signal and the first subcarrier signal is effectively suppressed, so that the compensation of the interference of the first subcarrier signal is realized, and 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 obtains an original signal of the first subcarrier signal according to the first subcarrier signal and the M pieces of first FEC extrinsic information, the method further includes: the receiving device obtains an original signal of a third subcarrier signal according to the first subcarrier signal and the M pieces of first FEC external information, where the third subcarrier signal is a subcarrier signal that is different from both the first subcarrier signal and the second subcarrier signal in the N paths of subcarrier signals.

It can be seen that, in the present aspect, the decoding of the third subcarrier signal is assisted by the M first FEC extrinsic information of the M second subcarrier signals and the first subcarrier signal. Therefore, 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 accuracy of decoding the third subcarrier signal is effectively improved.

Based on the first aspect, in an optional implementation manner, 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 FEC extrinsic information, the method further includes: the receiving device obtains M fourth cross correlation coefficients, where the M fourth cross correlation coefficients are correlation coefficients between fourth symbol information and M second symbol information, the fourth symbol information is at least one symbol included in the third subcarrier signal, and the M second symbol information includes at least one symbol corresponding to the M first FEC external information, respectively.

It can be seen that in this aspect, a fourth cross-correlation coefficient can be obtained according to the third subcarrier signal and the M pieces of first FEC extrinsic information, and the fourth cross-correlation coefficient can represent a correlation between the third subcarrier signal and the second subcarrier signal. And decoding the third subcarrier signal based on the correlation, and effectively inhibiting the interference of the first subcarrier signal and the second subcarrier signal on the third subcarrier signal.

Based on the first aspect, in an optional implementation manner, the receiving device obtains an original signal of the third subcarrier signal according to the first subcarrier signal and the M pieces of first FEC extrinsic information, where the receiving device obtains the original signal of the third subcarrier signal according to the following formula

As can be seen, the receiving device determines the fourth symbol information L_eFourth target parameter U_i*L_eThe difference between the M fifth target parameters and the M fifth target parameters is the original signal of the third subcarrier signal, wherein the fourth target parameter is a fifth cross-correlation coefficient U_iAnd the fourth symbol information L_eThe fifth cross-correlation coefficient is a correlation coefficient between the fourth symbol information and third symbol information, the third symbol information includes at least one symbol corresponding to second FEC external information, the second FEC external information is used to indicate a value of each bit included in the first subcarrier signal, and the M fifth target parameters are the M second symbol information (b)₁、b₂、b₃To b_M) Respectively with the M fourth cross correlation coefficients (V)₁、V₂、V₃To V_M) The product between them.

Based on the first aspect, in an optional implementation manner, before the receiving device obtains an original signal of the third subcarrier signal according to the first subcarrier signal and the M pieces of first FEC extrinsic information, the method further includes: the receiving device obtains M fifth cross correlation coefficients, where the M fifth cross correlation coefficients are correlation coefficients between third phase information and M second phase information, the third phase information is a phase of the third subcarrier signal, and the M second phase information is a phase of the M first FEC external information, respectively.

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

it is noted that the receiving apparatus determines the third phase information

The difference between the M sixth target parameters and the original signal of the third subcarrier signal 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、W₂、W₃To W_M) Respectively with the M second phase information (

To

) The product between;

the receiving device obtains the original signal of the third subcarrier signal according to the phase of the original signal of the third subcarrier signal.

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

Based on the first aspect, in an optional implementation manner, a 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 a first preset value; the difference between the amplitude of the first subcarrier signal sent by the sending device and the amplitude of the first subcarrier signal filtered by the receiving device is smaller than the first preset value, and 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.

Therefore, the first subcarrier signal and the second subcarrier signal which are completely positioned in the filter range of the filter of the receiving equipment help the third subcarrier signal with damaged amplitude to decode, and the accuracy of decoding the third subcarrier signal with damaged amplitude is effectively improved.

Based on the first aspect, in an optional implementation manner, a difference between the carrier frequency of each path 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 in this aspect, the first subcarrier signal and the second subcarrier signal are adjacent to each other, and the interference received by the first subcarrier signal and the second subcarrier signal is similar in the transmission process. The second subcarrier signal helps the first subcarrier signal to decode, and the accuracy of decoding the first subcarrier signal is effectively improved.

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

Therefore, the first subcarrier signal and the second subcarrier signal which are adjacent to the third subcarrier signal with the damaged amplitude help the third subcarrier signal to decode, and the accuracy of decoding the third subcarrier signal with the damaged amplitude is effectively improved.

In a second aspect, an embodiment of the present invention provides a network device, including: a processor, a memory and a receiver interconnected by a line, the memory and the processor being interconnected by a line, the memory having instructions stored therein, the processor being configured to perform the processing-related method of any of the above first aspects, the receiver being configured to perform the receiving-related method of any of the above first aspects.

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, which are connected in sequence. The logic circuitry is configured to perform any of the process-related steps of the first aspect described above. The interface circuit is adapted to perform any of the steps of the first aspect relating to receiving a subcarrier signal.

In a fourth aspect, an embodiment of the present invention provides a communication system, including a transmitting device and a receiving device, where the transmitting device is configured to transmit N subcarrier signals to the receiving device, and the receiving device is configured to perform the method described in any one of the first aspect.

In a fifth aspect, embodiments of the present invention provide a computer-readable storage medium, comprising instructions, which when executed on a computer, cause the computer to perform the method according to any one of the above first aspects.

In a sixth aspect, embodiments of the present invention provide a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of any of the first aspects described above.

According to the scheme, the interference conditions of the first subcarrier signal and the second subcarrier signal are similar in the transmission process. The receiving device can assist the first subcarrier signal in decoding through the M-path second subcarrier signal based on the correlation relationship of ISI between the first subcarrier signal and the second subcarrier signal or the correlation relationship of phase noise. The interference of the second subcarrier signal to the first subcarrier signal is effectively inhibited, and the accuracy of decoding the first subcarrier signal is improved.

If the filter of the receiving device filters the N received subcarrier signals, the amplitude of the third subcarrier signal included in the N subcarrier signals may be damaged. The third subcarrier signal is assisted to be decoded through the first subcarrier signal and the second subcarrier signal, and the accuracy of decoding the third subcarrier signal with the amplitude damaged is effectively improved.

Drawings

Fig. 1 is a diagram showing an example of a structure of a communication system provided by a conventional scheme;

FIG. 2 is a flowchart illustrating a first embodiment of a decoding method according to the present application;

fig. 3 is a diagram illustrating a first exemplary structure of a receiving device provided in the present application;

fig. 4 is a diagram of a first exemplary spectrum of an N-channel subcarrier signal provided in the present application;

FIG. 5 is a flowchart illustrating steps of a second embodiment of a decoding method according to the present application;

FIG. 6 is a flowchart illustrating steps of a decoding method according to a third embodiment of the present application;

fig. 7 is a diagram illustrating a second exemplary structure of a receiving device provided in the present application;

fig. 8 is a diagram of a second exemplary spectrum of an N-channel subcarrier signal provided in the present application;

FIG. 9 is a flowchart illustrating a fourth embodiment of a decoding method according to the present application;

FIG. 10 is a diagram illustrating an exemplary structure of a processing circuit according to an embodiment of the present disclosure;

fig. 11 is a diagram illustrating a third exemplary structure of a receiving device according to the present application.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

To better understand the method provided in the present application, a communication system to which the decoding method shown in the present application is applied will be first described below.

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 transmitting device 110 and a receiving device 120.

The transmitting device 110 is to transmit N bit streams, i.e., the bit streams TXa1, TXa2 to TXaN, to the receiving device 120. The value of N is not limited, and N is a positive integer greater than 1, for example.

The transmitting device 110 includes N FEC encoding modules, that is, FEC encoding module 1, FEC encoding module 2 to FEC encoding module N. The N FEC encoding modules perform FEC encoding on the N bit streams respectively to obtain encoded N bit streams, that is, encoded bit streams TXb1, TXb2 to TXbN. For example, the FEC coding module N performs FEC coding on the bitstream TXaN separately to obtain a coded bitstream TXbN.

The transmitting device comprises N digital-to-analog converters, i.e. digital-to-analog converter 1, digital-to-analog converter 2 to digital-to-analog converter N, respectively connected to the N FEC encoding modules. The N digital-to-analog converters respectively perform digital-to-analog conversion on the N encoded bit streams TXb1, TXb2 to TXbN to obtain N analog signals, i.e., analog signals TXc1, TXc2 to TXcN.

The modulators 111 included in the transmission apparatus 110 are connected to the N digital-to-analog converters, respectively. The modulator 111 is used for modulating the received N analog signals TXc1, TXc2 to TXcN to modulate onto N subcarriers.

Specifically, the transmitting device modulates the N encoded bit streams onto N orthogonal subcarriers by using a multicarrier modulation technique. The multi-carrier modulation technique may be Orthogonal Frequency Division Multiplexing (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 apparatus 120 receives N subcarriers from the optical fiber 130. The demodulator 121 is configured to demodulate the N subcarriers to obtain N demodulated bit streams, i.e., demodulated subcarriers RXa1, RXa2 to RXaN.

The receiving device 120 comprises N analog-to-digital converters, i.e. analog-to-digital converter 1, analog-to-digital converter 2 to analog-to-digital converter N, connected to a modulator 121. The N analog-to-digital converters respectively perform analog-to-digital conversion on the N demodulated subcarriers RXa1, RXa2 to RXaN to acquire N digital signals, that is, digital signals RXb1, RXb2 to RXbN.

The receiving device 120 comprises 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 paths of digital signals respectively to obtain N paths of dispersion-compensated signals.

The receiving device 120 comprises 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 paths of dispersion-compensated signals to obtain N paths of polarization-compensated signals.

The receiving device 120 comprises a phase recovery module 124 connected to a polarization compensation module 123. The phase recovery module 124 is configured to perform phase recovery on the N polarization compensated signals to obtain N subcarrier signals, i.e., RXc1, RXc2 through RXcN.

The receiving device 120 comprises N FEC decoding modules, namely FEC decoding module 1, FEC decoding module 2 to FEC decoding module N, connected to the phase recovery module 124. The N FEC decoding modules are respectively configured to perform FEC decoding on the N paths of subcarrier signals, so as to obtain original signals of the N paths of subcarrier signals, that is, original signals RXd1, RXd2 through RXdN.

It can be seen that the receiving device 120 provided in the prior art respectively decodes the N subcarrier signals. In the decoding process, mutual interference between adjacent subcarrier signals is not considered, and the accuracy of decoding the subcarrier signals is reduced.

In summary, the present application provides a decoding method. By adopting the method disclosed by the application, the receiving equipment can compensate the interference between the adjacent subcarrier signals based on the correlation between the adjacent subcarrier signals in the process of decoding each path of subcarrier signals, thereby effectively improving the accuracy of decoding the subcarrier signals.

In the present application, different decoding methods are employed based on the correlation between different subcarrier signals. The implementation of the decoding method provided by the present embodiment is exemplarily described below with reference to fig. 2. The decoding method shown in this embodiment describes a decoding process of each channel of subcarrier signals based on a correlation relationship between inter-symbol interference (ISI) among different subcarrier signals:

step 201, the sending device sends N paths of subcarrier signals to the receiving device.

Please refer to fig. 1 for a description of a process of sending N subcarrier signals from a sending device to a receiving device, which is not described in detail in this embodiment.

Step 202, the receiving device acquires the subcarrier replica signal.

The receiving device shown in this embodiment obtains N sub-carrier signals by respectively copying the N sub-carrier signals. It can be seen that the N-path subcarrier replication signal is generated by replicating the N-path subcarrier signal.

Specifically, the receiving device copies each symbol included in each sub-carrier signal one by one to generate the sub-carrier signal. As can be seen, the subcarrier signal and the replica subcarrier signal generated by replicating the subcarrier signal all include the same symbols.

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

the receiving apparatus shown in fig. 3 of the present embodiment is different from the receiving apparatus shown in fig. 1 in that the present embodiment adds a calculating unit 300 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, and is only used to facilitate understanding of the implementation process of the method shown in this embodiment, and is not meant to limit the structure of the receiving device.

The 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 may also be a processing device, and the functions of the processing device may be partially or completely implemented by software. The computing unit 300 at this time may include a memory for storing a computer program and a processor for reading and executing the computer program stored in the memory to perform the corresponding processes and/or steps performed by the computing unit 300 shown in the present embodiment. Alternatively, the computing unit 300 may only comprise a processor, and a 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. Alternatively, part or all of the functions of the computing unit 300 may be implemented by hardware. At this time, the calculation 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 replication modules, i.e., replication module 1, replication module 2, and replication module N, connected to the phase recovery module. The calculation unit 300 further comprises a processing module 301 connected to the N FEC decoding modules. The processing module 301 and the N copy modules are connected with N cache modules, that is, the cache module 1, the cache module 2, and the cache module N.

In this embodiment, the N replication modules are respectively configured to replicate the N paths of subcarrier signals to generate N paths of replication subcarrier signals, that is, replication subcarrier signals cp1, cp2 to cpN. For example, if the subcarrier signal is RXc1, the replication module 1 replicates this RCx1 to generate a first replicated subcarrier signal cp 1.

And the N replication modules respectively transmit the output N-path replication subcarrier signals to the N cache modules for caching. For example, the copy module 1 transmits the first copy subcarrier signal cp1 to the buffer module 1. The buffer module 1 buffers the first sub subcarrier signal cp 1.

The N replica modules transmit the N 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 paths of subcarrier signals respectively to obtain FEC external information.

In this embodiment, N FEC decoding modules included in the receiving device perform FEC decoding on the N subcarrier signals, and the N FEC decoding modules may output N FEC external information.

Through the FEC decoding process of the N FEC decoding modules on the N paths of subcarrier signals, the N FEC decoding modules can output FEC external information corresponding to the N paths of subcarrier signals. And the FEC external information corresponding to each path of subcarrier signal is the value situation of each symbol included in each path of subcarrier signal. The value taking situation may be a value of each symbol included in the subcarrier signal and a probability corresponding to each value.

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

The value taking situation may also be a value of a symbol group included in the subcarrier signal and a probability corresponding to each symbol group. Wherein the symbol packet comprises two or more consecutive symbols in the subcarrier signal. The number of symbols included in the symbol packet is not limited in this embodiment.

For example, for a 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 value and the corresponding probability of the symbol packet. Specifically, the symbol packet may be two consecutive symbols included in a subcarrier signal, such as { c1 c2 }. The FEC external information corresponding to the symbol packet may be a probability that { c1 c2} takes a value of "00", a probability that { c1 c2} takes a value of "01", a probability that { c1 c2} takes a value of "10", and a probability that { c1 c2} takes a value of "11".

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

The method shown in this embodiment can improve the accuracy of FEC decoding on N subcarrier signals by using the correlation between adjacent subcarrier signals. For this reason, the receiving device shown in this embodiment needs to determine the first subcarrier signal and the M second subcarrier signals in the N subcarrier signals.

In this embodiment, the first subcarrier signal is any one of N subcarrier signals, which is taken as an example for exemplary explanation. The second subcarrier signal is a subcarrier signal adjacent to the first subcarrier signal among the N subcarrier signals. The specific value of M is not limited in this embodiment, as long as M is a positive integer greater than or equal to 1, and M is less than N.

In this embodiment, the first subcarrier signal can be assisted to be decoded by the M paths of second subcarrier signals, so that the purpose of suppressing the interference of the second subcarrier signal on the first subcarrier signal through the correlation between the second subcarrier signal and the first subcarrier signal is achieved, and the accuracy of decoding the first subcarrier signal is effectively improved.

To achieve the purpose that M paths of second subcarrier signals help the first subcarrier signal to decode, the following first describes the relationship between the first subcarrier signal and the second subcarrier signal:

the present embodiment exemplifies that the second subcarrier signal and the first subcarrier signal are adjacent in N paths of subcarrier signals. It should be clear that, in this embodiment, the description of the relationship between the first subcarrier signal and the second subcarrier signal is an optional example, and is not limited, in other examples, the second subcarrier signal may be any subcarrier signal different from the first subcarrier signal in N paths of subcarrier signals.

The first subcarrier signal and the second subcarrier signal are exemplary described next in connection with fig. 4. Fig. 4 is a diagram illustrating a spectrum example including N subcarrier signals. The abscissa of the graph of the spectrum example represents the magnitude of the carrier frequency of each subcarrier signal. The ordinate of the diagram of the spectrum example indicates the magnitude of the amplitude of each path of subcarrier signal.

The specific value of N is not limited in this embodiment. In the exemplary diagram of the spectrum shown in fig. 4, N subcarrier signals are sequentially arranged in the order of increasing carrier frequency. 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 seen that the second subcarrier signal 404, the first subcarrier signal 401, the second subcarrier signal 402, and the second subcarrier signal 403 are sequentially ordered according to the carrier frequency from small to large.

If the second subcarrier signal is adjacent to the first subcarrier signal, the difference between the carrier frequency of the second subcarrier signal and the carrier frequency of the first subcarrier signal in each path is less than or equal to a second preset value. The second preset value is not limited in size, as long as the second subcarrier signal can improve the accuracy of decoding the first subcarrier signal when 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.

The following explains why the accuracy of decoding the first subcarrier signal can be improved by the second subcarrier signal:

it is to be understood that N paths of subcarrier signals transmitted between the transmitting device and the receiving device are shown in the present embodiment. In the process of transmitting the N paths of subcarrier signals, the same transmitting device, optical fiber and receiving device are used, so that the N paths of subcarrier signals are subjected to similar interference.

In addition, in the N paths of subcarriers, the closer the carrier frequency is, the more similar the interference situation is received by the two subcarrier signals. In this embodiment, under the condition that interference between the first subcarrier signal and the second subcarrier signal is similar, the receiving device may improve accuracy of FEC decoding on the first subcarrier signal by using the first FEC external information output after FEC decoding is performed on the second subcarrier signal, and the specific process is as follows.

Step 204, the receiving device obtains the first symbol information R_i。

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

The receiving device acquires a first sub-carrier signal cpi identical to the first sub-carrier signal RXci, and determines that the first sub-carrier signal cpi is a target sub-carrier signal for FEC decoding of the first sub-carrier signal RXci.

The receiving device determines the symbol included in the target subcarrier signal cpi as the first symbol information R_i。

As shown in fig. 3, if the first subcarrier signal is RXci, the processing module 301 obtains the sub-subcarrier signal cpi which is stored by the buffer module i and is identical to the first subcarrier signal RXci. The processing module 301 determines that the sub-carrier-replica signal cpi is a target sub-carrier signal. The processing module 301 determines all symbols included in the target subcarrier signal cpi as the first symbol information R_i。

Step 205, the receiving device obtains a first target parameter.

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

first, the receiving device determines the third symbol information a_i。

Specifically, the first subcarrier signal RXci determined by the receiving device is the ith subcarrier signal in the N subcarrier signals. The receiving device determines that the FEC external information output by the FEC decoding module, which is used for FEC decoding on the ith subcarrier signal (first subcarrier signal), in the N FEC decoding modules is the second FEC external information.

The receiving device converts the second FEC external information, so as to convert each bit included in the second FEC external information into a corresponding symbol. The receiving device determines the third symbol information a_iIncluding the respective symbols converted by the respective bits comprised by the second FEC overhead information.

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

The processing module 301 converts each bit included in the second FEC external information into a corresponding symbol. The processing module 301 determines each symbol converted by the second FEC external information as the third symbol information a_i。

Secondly, the receiving device obtains a 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. As can be seen, the second cross-correlation coefficient is used to indicate a degree of correlation between the first symbol information and the third symbol information.

The embodiment does not limit the specific operation manner of the correlation operation, as long as the second cross correlation coefficient X_iIt is sufficient that the degree of correlation between the first symbol information and the third symbol information can be indicated.

And thirdly, the receiving equipment acquires the first target parameter.

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

Equation 1: first target parameter ═ a_i*X_i。

As can be understood from the equation 1, the first target parameter shown in this embodiment is the second cross-correlation coefficient X_iAnd the first symbol information a_iThe product between them.

Step 206, the receiving device obtains 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 a specific process for acquiring the second target parameter by the receiving device:

first, the receiving device determines M paths of second subcarrier signals among the N paths of subcarrier signals. For a specific description of the M paths of second subcarrier signals, please refer to step 203 in detail, which is not described in detail.

Second, the receiving device determines M second symbol information.

The M pieces of second symbol information shown in this embodiment are b₁、b₂、b₃To b_M. The M second symbol information respectively includes at least one symbol corresponding to the M first FEC outer information.

Specifically, the receiving device determines that M FEC external information output by M FEC decoding modules, which are used for FEC decoding the M paths of second subcarrier signals, in the N FEC decoding modules is M first FEC external information.

The receiving device converts the M pieces of first FEC external information respectively, so as to convert the bits included in each piece of first FEC external information into corresponding symbols. The receiving device obtains corresponding M pieces of second symbol information, namely b, according to the M pieces of first FEC external information₁、b₂、b₃To b_M。

For example, the FEC decoding module M is configured to FEC-decode an mth second subcarrier signal RXcM in the M second subcarrier signals, among N decoding modules included in the receiving device. The processing module 301 determines that the FEC external information output by the FEC decoding module M is the first FEC external information. The processing module 301 converts each bit included in the first FEC outer information into a corresponding symbol. The processing module 301 determines the symbol converted by the first FEC external information as the second symbol information b_M。

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

Specifically, the receiving device correlates the first symbol information with the M second symbol informationOperating to obtain M of the first cross-correlation coefficients, i.e. Y₁、Y₂、Y₃To 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 Y₁For indicating the first symbol information and the second symbol information b₁The degree of correlation between them, and so on, the first cross-correlation coefficient Y_MFor indicating the first symbol information and the second symbol information b_MThe degree of correlation between them.

Thirdly, the receiving device acquires the M second target parameters.

The M second target parameters shown in this embodiment are used to compensate for 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、b₂、b₃To b_M) Respectively with the M first cross correlation coefficients (Y)₁、Y₂、Y₃To Y_M) The product between them.

Step 207, the receiving device obtains the original signal of the first subcarrier signal.

Specifically, the receiving device shown in this embodiment may obtain the original information R of the first subcarrier signal according to the following formula 2_i ^*。

Equation 2:

it can be seen that the original information R of the first subcarrier signal_i ^*The difference value between the first symbol information, 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 subcarrier signal, after the original signal of the first subcarrier signal is obtained, the step 203 is returned to be executed. So as to input the original signal of the first subcarrier signal to the corresponding FEC decoding module. The first subcarrier signal is FEC decoded again. Because the FEC decoding is carried out on the first subcarrier signal for a plurality of times, the accuracy of the FEC external information output by the FEC decoding module can be effectively improved. As can be seen, by performing steps 203 to 207 through multiple iterations, based on the more accurate first FEC external information and the second FEC external information, the accuracy of FEC decoding on the first subcarrier signal is effectively improved.

With the method shown in this embodiment, the first subcarrier signal is decoded based on the correlation relationship of ISI between adjacent first and second subcarrier signals. In the process of decoding the first subcarrier signal, the interference between the second subcarrier signal and the first subcarrier signal is effectively suppressed, so that the compensation of the interference of the first subcarrier signal is realized, and the accuracy of decoding the subcarrier signal is effectively improved.

The implementation of the decoding method provided by the present embodiment is exemplarily described below with reference to fig. 5. The decoding method shown in this embodiment explains the decoding process of each path of subcarrier signal based on the correlation of phase noise between different subcarrier signals:

step 501, the sending device sends N paths of subcarrier signals to the receiving device.

Step 502, the receiving device acquires the subcarrier replica signal.

Step 503, the receiving device performs FEC decoding on the N paths of subcarrier signals respectively to obtain FEC external information.

For a 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 in detail, which is not repeated in this embodiment.

Step 504, the receiving device obtains the first phase information.

The first phase information shown in this embodiment

Is the phase of the target subcarrier signal. Wherein, the target subcarrier signal shown in this embodiment is a pass signalFor a specific description of the target subcarrier signal, please refer to step 204 shown in fig. 2 for details, which will not be described in detail.

And step 505, receiving M third cross-correlation coefficients of the device.

The following describes a specific process for acquiring M third cross-correlation coefficients by the receiving device:

first, the receiving device obtains M first FEC external information corresponding to M second subcarrier signals, and please refer to step 205 shown in fig. 2 for details of a specific description of the M first FEC external information, which is not described in detail specifically.

Next, the receiving apparatus acquires M second phase information, i.e.

To

Wherein, the M second phase information are the phases of the M first FEC external information, respectively.

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

The M third cross correlation coefficients are the first phase information

Respectively with M second phase information (i.e. M phase information)

To is that

) The correlation coefficient between them.

Specifically, the receiving device pairs the first phase information

Performing correlation operation with M second phase information to obtain M third cross correlation coefficients, namely Z₁、Z₂、Z₃To Z_M. For the correlationFor the explanation of the operation, please refer to fig. 2 in detail, which is not described in detail.

It is to be understood that the M third cross-correlation coefficients are indicative of the first phase information

Respectively, with the second phase information.

For example, the third cross-correlation coefficient Z₁For indicating the first phase information

And second phase information

The degree of correlation between the two, and so on, and the third cross-correlation coefficient Z_MFor indicating the first phase information

And second phase information

The degree of correlation between them.

Step 506, the receiving device obtains M third target parameters.

This third target parameter shown in this embodiment is used to compensate for 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、Z₂、Z₃To Z_M) Respectively with M pieces of second phase information (

To

) The product between them.

Step 507, the receiving device obtains 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

Equation 3:

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

Is equal to the first phase information

And M third target parameters.

Step 508, the receiving device obtains an original signal of the first subcarrier signal.

In this embodiment, the phase of the original signal of the first subcarrier signal is obtained by the receiving device

In case of a first subcarrier signal, the receiving apparatus converts the phase of the original signal of the first subcarrier signal

Converted into the original signal of the first subcarrier signal.

In this embodiment, to improve the accuracy of decoding the first subcarrier signal, after the original signal of the first subcarrier signal is obtained, the step 503 is executed again. So as to input the original signal of the first subcarrier signal to the corresponding FEC decoding module. The first subcarrier signal is FEC decoded again. Since the FEC decoding is performed on the first subcarrier signal for multiple times, the accuracy of the FEC external information output by the FEC decoding can be effectively improved, and as can be seen, the accuracy of decoding the first subcarrier signal is effectively improved by performing the steps 503 to 508 through multiple iterations based on the more accurate first FEC external information and the more accurate second FEC external information.

With the method shown in this embodiment, the first subcarrier signal is decoded based on the correlation of phase noise between the adjacent first subcarrier signal and second subcarrier signal. In the process of decoding the first subcarrier signal, the interference between the second subcarrier signal and the first subcarrier signal is effectively suppressed, so that the compensation of the interference of the first subcarrier signal is realized, and the accuracy of decoding the subcarrier signal is effectively improved.

If the filter of the receiving device filters the N paths of subcarrier signals, the amplitude of one or more subcarrier signals in the N paths of subcarrier signals may be damaged. If the subcarrier signal with the damaged amplitude is decoded, the accuracy of decoding the subcarrier signal is reduced. The embodiment shown in fig. 6 can decode the subcarrier signals with amplitude impairment based on the correlation relationship of ISI between different subcarrier signals, thereby effectively improving the accuracy of decoding the subcarrier signals with amplitude impairment.

Step 601, the sending device sends N paths of subcarrier signals to the receiving device.

The execution process of step 601 shown in this embodiment is shown in step 201 shown in fig. 2, and details of the execution process are not described in this embodiment.

Step 602, the receiving device generates a sub-carrier signal by copying the first sub-carrier signal and the second sub-carrier signal.

The difference between this embodiment and the embodiment shown in fig. 2 is that the receiving device shown in this embodiment does not copy each sub-carrier signal to generate a sub-carrier signal. That is, the sub-carrier signals shown in this embodiment are generated by only copying the first sub-carrier signals and the second sub-carrier signals, and the third sub-carrier signals are not copied.

To better understand the method shown in this embodiment, an alternative structure of the receiving apparatus shown in this embodiment is described below with reference to fig. 7:

the difference between the receiving apparatus shown in fig. 7 and the receiving apparatus shown in fig. 3 in this embodiment is that in the calculating unit 700 connected between the phase recovery module and the FEC decoding module, a duplication module for duplicating is included in the transmission path of the first subcarrier signal and the second subcarrier signal. For a detailed description of the copy module, please refer to fig. 3, which is not described in detail. In the calculating unit 700, the transmission path of the third subcarrier signal does not include a duplication module for duplication.

For example, the buffering module 1 shown in fig. 7 is used for buffering the third subcarrier signal RXc1, and the buffering module N is used for buffering the third subcarrier signal RXc 1. It can be seen that in the calculation unit 700, the third subcarrier signal RXc1 is not included in the transmission path.

In the calculation unit 700, the transmission path of the first subcarrier signal and the second subcarrier signal includes a copy module. The explanation is given by taking the subcarrier signal RXci as the first subcarrier signal as an example. The replication module i included in the calculation unit 700 is configured to replicate the first subcarrier signal RXci to generate a replication subcarrier signal cpi.

And the replication module i transmits the replication subcarrier signal cpi to a buffer module i for buffering. For detailed description of the copy module, the cache module, and the processing module 701 in this embodiment, please refer to the embodiment shown in fig. 3 for details, which are not repeated herein.

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

The third subcarrier signal is explained below:

as shown in the exemplary diagram of the spectrum shown in fig. 8, the N subcarrier signals are sequentially arranged according to the order of the carrier frequencies from small to large, which is shown in fig. 4 and will not be described in detail.

The difference between the exemplary spectrum diagram shown in fig. 8 and the exemplary spectrum diagram shown in fig. 4 is that the exemplary spectrum diagram of N subcarriers shown in fig. 8 is a filtered exemplary spectrum diagram after being filtered by a filter of a receiving device.

The region 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

subcarrier signals

801, 802, 803, and 804, subcarrier signal 802 and subcarrier signal 803 are located entirely within region 800. Taking the subcarrier signal 802 as an example, in the case that the subcarrier signal 802 is completely within the filtering range of the filter, the difference between the amplitude of the subcarrier signal 802 before being filtered by the filter and the amplitude of the subcarrier signal after being filtered by the filter is small. It can be seen that filtering via the filter does not result in impairment of the amplitude of the subcarrier signal 802.

The present embodiment takes the subcarrier signal completely located in the filtering range of the filter as the first subcarrier signal or the second subcarrier signal as an example for exemplary explanation. It can be known that the difference between the amplitude of the first subcarrier signal sent by the sending device and the amplitude of the first subcarrier signal filtered by the receiving device is smaller than 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 size of the first preset value is not limited in this embodiment, as long as the difference between the amplitude of the subcarrier signal before filtering and the amplitude of the subcarrier signal after filtering is smaller than the first preset value, it is sufficient to indicate that the subcarrier signal is located within the filtering range of the filter.

Whereas the subcarrier signals 801 and 804 shown in fig. 8 do not lie completely within the filtering range 800 of the filter. Taking the subcarrier signal 801 as an example, in the case where the subcarrier signal 801 is not completely within the filtering range of the filter, the difference between the amplitude of the subcarrier signal 801 before being filtered by the filter and the amplitude of the subcarrier signal after being filtered by the filter is large. It can be seen that filtering via the filter results in an impairment of the amplitude of the subcarrier signal 801.

The present embodiment takes the subcarrier signal that is not completely within the filtering range of the filter as the third subcarrier signal for example. 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.

In this embodiment, an exemplary description is given of a relationship among a first subcarrier signal, a second subcarrier signal, and a third subcarrier signal in N paths of subcarrier signals:

it should be clear that, in this embodiment, the description of the relationship among the first subcarrier signal, the second subcarrier signal, and the third subcarrier signal is an optional example, and is not limited, as long as the third subcarrier signal is not completely located within the filtering range of the filter, and the first subcarrier signal and the second subcarrier signal are any two subcarrier signals completely located within the filtering range of the filter.

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

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

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

As can be seen from the above description, if the third subcarrier signal is not completely located within the filtering range of the filter, the amplitude of the third subcarrier signal is damaged before and after filtering. It can be known that, if the FEC decoding module directly performs FEC decoding on the third subcarrier signal, the accuracy of performing FEC decoding on the third subcarrier signal may be reduced.

In the present embodiment, the first subcarrier signal and the second subcarrier signal help to decode the third subcarrier signal with impaired amplitude. The accuracy of decoding the third subcarrier signal is effectively improved. The FEC decoding process for the first subcarrier signal is assisted by the first subcarrier signal and the second subcarrier signal, which is described in detail in the following steps.

Step 603, the receiving device performs FEC decoding on the first subcarrier signal and the second subcarrier signal respectively to obtain FEC external information.

As shown in step 602, the receiving device does not duplicate the third subcarrier signal, and the receiving device does not FEC decode the third subcarrier signal. Continuing with fig. 7, for the third subcarrier signal RXc1, the buffering module 1 buffers the third subcarrier signal RXc 1. The processing module 701 does not transmit the third subcarrier signal RXc1 to the FEC decoding module 1 for FEC decoding.

For the first subcarrier signal and the second subcarrier signal, the receiving device may duplicate and send the duplicated signals to the corresponding FEC decoding module for FEC decoding, and for a description of a specific process, please refer to step 203 in fig. 2 in detail, which is not described in detail.

Step 604, the receiving device obtains the fourth symbol information L_e。

Specifically, the receiving device obtains the third subcarrier signal Rxce from the buffer module when determining that the e-th subcarrier signal of the N-th subcarrier signals is the third subcarrier signal Rxce. The value of e is not limited in this embodiment, as long as e is a positive integer greater than or equal to 1, and e is less than or equal to N.

As can be seen from the above, the calculating 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 may 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 L_e。

Step 605, the receiving device obtains a fourth target parameter.

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

first, the receiving device determines the third symbol information a_i。

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

The processing module 701 converts each bit included in the second FEC external information into a corresponding symbol. The processing module 701 determines each symbol converted by the second FEC external information as the third symbol information a_i。

Secondly, the receiving device obtains a fifth cross correlation coefficient U_i。

Specifically, the receiving device compares the fourth symbol information L_eAnd third symbol information a_iPerforming a correlation operation to obtain the fifth cross-correlation coefficient U_i. As can be seen, this fifth cross-correlation coefficient U_iFor indicating the fourth symbol information L_eAnd third symbol information a_iThe degree of correlation between them. For a detailed description of the related operations, please refer to the embodiment shown in fig. 2, which is not described in detail in this embodiment.

And thirdly, the receiving equipment acquires a fourth target parameter.

The receiving apparatus shown in this embodiment may obtain the fourth target parameter based on equation 4.

Equation 4: fourth target parameter ═ U_i*L_e。

As can be understood from the equation 4, the fourth target parameter shown in this embodiment is the fifth cross-correlation coefficient U_iAnd the fourth symbol information L_eThe product between them.

Step 606, the receiving device obtains 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 a specific process of the receiving device acquiring the fifth target parameter:

first, the receiving device determines M second subcarrier signals among the N subcarrier signals. For a detailed description of the M second subcarrier signals, please refer to step 203 for details, which are not described in detail.

Second, the receiving device determines M second symbol information.

The M pieces of second symbol information shown in this embodiment are b₁、b₂、b₃To b_M. The M second symbol information respectively includes at least one symbol corresponding to the M first FEC outer information. For a detailed description of the M pieces of second symbol information, please refer to step 206 shown in fig. 2, which is not described in detail in this embodiment.

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

Specifically, the receiving device processes the fourth symbol information and the M second symbol informationPerforming a line correlation operation to obtain M fourth cross-correlation coefficients, i.e. V₁、V₂、V₃To V_M. 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 V₁For indicating the fourth symbol information L_eAnd second symbol information b₁The degree of correlation between the four cross correlation coefficients, and so on_MFor indicating the fourth symbol information L_eAnd second symbol information b_MThe degree of correlation between them.

Thirdly, 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、b₂、b₃To b_M) Respectively with the M fourth cross correlation coefficients (V)₁、V₂、V₃To V_M) The product between them.

Step 607, the receiving device obtains 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 paths of second subcarrier signals and the third subcarrier signal. In this embodiment, the FEC decoding on the third subcarrier signal may be implemented by using the fourth target parameter and the M fifth target parameters, so as to improve accuracy of FEC decoding on the third subcarrier signal.

Specifically, the receiving device shown in this embodiment may obtain the original information L of the third subcarrier signal according to the following formula 5_e ^*。

Equation 5:

it can be seen that the original information L of the third subcarrier signal_e ^*Is the fourth symbol information, the fourth target parameterThe difference between the M fifth target parameters is the original signal of the third subcarrier signal.

In this embodiment, to improve the accuracy of decoding the third subcarrier signal, after the original signal of the third subcarrier signal is obtained, the step 603 is returned to. So that the accuracy of decoding the third subcarrier signal is effectively improved based on the more accurate first FEC external information and the second FEC external information by performing steps 603 to 607 through multiple iterations.

With the method shown in this embodiment, the third subcarrier signal with an impairment in amplitude is decoded based on the correlation relationship of ISI between the adjacent first subcarrier signal and second subcarrier signal. In the process of decoding the third subcarrier signal, the second FEC external signal corresponding to the first subcarrier signal and the first FEC external information corresponding to the second subcarrier signal are used, so that the accuracy of decoding the third subcarrier signal with amplitude damage is effectively improved.

The implementation of the decoding method provided by the present embodiment is exemplarily described below with reference to fig. 9. The decoding method shown in this embodiment describes a decoding process of a third subcarrier signal with an amplitude impairment based on a correlation of phase noise between a first subcarrier signal and a second subcarrier signal. For a specific description of the third subcarrier signal with impaired amplitude, please refer to the embodiment shown in fig. 6 in detail, which is not described in detail in this embodiment.

Step 901, the sending device sends N paths of subcarrier signals to the receiving device.

Step 902, the receiving device generates a sub-carrier signal by copying the first sub-carrier signal and the second sub-carrier signal.

Step 903, the receiving device performs FEC decoding on the first subcarrier signal and the second subcarrier signal respectively to obtain FEC external information.

For a description of the execution process from step 901 to step 903 shown in this embodiment, please refer to step 601 to step 603 shown in fig. 6 in detail, which is not repeated in this embodiment.

And 904, acquiring third phase information by the receiving equipment.

The third phase information shown in the present embodiment

Is the phase of the third subcarrier signal.

Specifically, the receiving device obtains the third subcarrier signal Rxce from the buffer module when determining that the e-th subcarrier signal of the N-th subcarrier signals is the third subcarrier signal Rxce.

Referring to the embodiment shown in fig. 6, the calculating 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 may 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 obtains M fifth cross correlation coefficients.

The following describes a specific process of acquiring M fifth cross-correlation coefficients by the receiving device:

Next, the receiving apparatus acquires M second phase information, i.e.

To

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

The M fifth cross correlation coefficients are third phase information

And correlation coefficients between the respective M second phase information. Specifically, the receiving device compares the third phase information

Performing correlation operation with M second phase information to obtain M fifth cross correlation coefficients, namely W₁、W₂、W₃To W_M. For a detailed description of the related operations, please refer to fig. 2, which is not described in detail.

It will be appreciated that the M of the fifth cross-correlation coefficients (i.e., W)₁、W₂、W₃To W_M) For indicating the third phase information

Respectively, with the second phase information.

For example, the fifth cross-correlation coefficient W₁For indicating the third phase information

And second phase information

The degree of correlation between the first and second cross-correlation coefficients, and so on, the third cross-correlation coefficient W_MFor indicating the third phase information

And second phase information

The degree of correlation between them.

Step 906, the receiving device obtains M sixth target parameters.

The M sixth target parameters shown in this embodiment are the M fifth cross-correlation coefficients (W)₁、W₂、W₃To W_M) Respectively with the M second phase information (

To

) The product between.

Step 907, the receiving device obtains the phase of the original signal of the third subcarrier signal.

Specifically, the receiving device shown in this embodiment may obtain the phase of the original information of the third subcarrier signal according to equation 6 shown below

Equation 6:

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

Is equal to the third phase information

And M sixth target parameters.

Step 908, the receiving device obtains an original signal of the third subcarrier signal.

In this embodiment, the phase of the original signal of the third subcarrier signal is obtained by the receiving device

In case that the receiving apparatus converts the phase of the original signal of the third subcarrier signal

Converted into 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 obtained, the step 903 is returned to be executed. 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 FEC external information and the second FEC external information.

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

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

The logic 1001 performs the steps associated with the processing shown in any of the embodiments of fig. 2, 5, 6, and 9. The interface circuit 1002 is configured to perform the steps associated with receiving a subcarrier signal as described in any of the embodiments of fig. 2, 5, 6, and 9.

Alternatively, the logic circuit 1001 shown in this embodiment may also be referred to as a processor. The interface circuit 1002 may also implement a receive function by an interface circuit.

The processing device shown in this embodiment and including the processing circuit 1000 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 arrays (FPGAs), Application Specific Integrated Circuits (ASICs), system on chips (socs), Central Processing Units (CPUs), digital signal processing circuits (DSPs), Micro Controllers (MCUs), Programmable Logic Devices (PLDs), or other integrated chips, or any combination of the above chips or processors.

The following describes a specific structure of the network device provided in the present application 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, 5, 6, and 9.

The network device 1100 includes a processor 1101, a memory 1102, and a receiver 1103. The processor 1101, memory 1102 and receiver 1103 are interconnected by wires. Memory 1102 is used to store program instructions and data, among other things.

The memory 1102 shown in this embodiment stores processing-related steps executed by the processor 1101 among the steps shown in any one of fig. 2, 5, 6 and 9. The receiver 1103 is configured to perform the steps related to receiving the subcarrier signal as shown in any one of the embodiments of fig. 2, 5, 6 and 9.

For example, in fig. 2, receiver 1103 is configured to receive N subcarrier signals from a transmitting device. The processor 1101 is configured to execute step 202 to step 207.

As another example, in fig. 5, receiver 1103 is configured to receive N subcarrier signals from a transmitting device. The processor 1101 is configured to execute step 502 to step 508.

As another example, in fig. 6, receiver 1103 is configured to receive N subcarrier signals from a transmitting device. The processor 1101 is configured to execute step 602 to step 608.

As another example, in fig. 9, receiver 1103 is configured to receive N subcarrier signals from a transmitting device. The processor 1101 is configured to perform steps 902 to 908.

Based on the above embodiments, the present application also provides a computer-readable storage medium, in which a software program is stored, and the software program can implement the method provided by any one or more of the above embodiments when being read and executed by one or more processors.

It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present application without departing from the scope of the embodiments of the present application. Thus, if such 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 encompass such modifications and variations.

Claims

1. A method of decoding, the method comprising:

receiving N paths of subcarrier signals by receiving equipment, wherein the N paths of subcarrier signals comprise one path of first subcarrier signal and M paths of second subcarrier signals, M is a positive integer greater than or equal to 1, N is a positive integer greater than 1, and M is smaller than N;

the receiving device performs Forward Error Correction (FEC) decoding on each path of the second subcarrier signal to acquire first FEC external information, wherein the first FEC external information is used for indicating the value taking condition of each bit included in the second subcarrier signal;

and the receiving equipment acquires the original signal of the first subcarrier signal according to the first subcarrier signal and the M pieces of first FEC external information.

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

the receiving device obtains a target subcarrier signal, wherein the target subcarrier signal is generated by copying the first subcarrier signal;

and the receiving equipment acquires the original signal of the first subcarrier signal according to the target subcarrier signal and the M pieces of first FEC external information.

3. The method according to claim 2, wherein before the receiving device obtains the original signal of the first subcarrier signal according to the target subcarrier signal and the M pieces of first FEC extrinsic information, the method further comprises:

the receiving device obtains M first cross-correlation coefficients, where the M first cross-correlation coefficients are correlation coefficients between first symbol information and M second symbol information, the first symbol information is at least one symbol included in the target subcarrier signal, and the M second symbol information includes at least one symbol corresponding to the M first FEC external information, respectively.

4. The method according to claim 3, wherein the obtaining, by the receiving device, an original signal of the first subcarrier signal according to the target subcarrier signal and the M pieces of first FEC extrinsic information includes:

the receiving device determines that a difference value between the first symbol information, a first target parameter and M second target parameters is an original signal of the first subcarrier signal, where the first target parameter is a product between a second cross-correlation coefficient and the first symbol information, the second cross-correlation coefficient is a correlation coefficient between the first symbol information and third symbol information, the third symbol information includes at least one symbol corresponding to second FEC external information, the M second target parameters are products between the M second symbol information and the M first cross-correlation coefficients, respectively, and the second FEC external information is used to indicate a value of each bit included in the first subcarrier signal.

5. The method according to claim 2, wherein before the receiving device obtains the original signal of the first subcarrier signal according to the target subcarrier signal and the M pieces of first FEC extrinsic information, the method further comprises:

the receiving device obtains M third cross correlation coefficients, where the M third cross correlation coefficients are correlation coefficients between first phase information and M second phase information, the first phase information is a phase of the target subcarrier signal, and the M second phase information is a phase of the M first FEC external information.

6. The method according to claim 5, wherein the obtaining, by the receiving device, an original signal of the first subcarrier signal according to the target subcarrier signal and the M pieces of first FEC extrinsic information includes:

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

and the receiving equipment acquires the original signal of the first subcarrier signal according to the phase of the original signal of the first subcarrier signal.

7. The method according to any one of claims 1 to 6, after the receiving device acquires an original signal of the first subcarrier signal according to the first subcarrier signal and the M pieces of first FEC extrinsic information, the method further comprising:

and the receiving device acquires an original signal of a third subcarrier signal according to the first subcarrier signal and the M pieces of first FEC external information, where the third subcarrier signal is a subcarrier signal different from both the first subcarrier signal and the second subcarrier signal in the N paths of subcarrier signals.

8. The method according to claim 7, wherein before the receiving device obtains the original signal of the third subcarrier signal according to the first subcarrier signal and the M pieces of first FEC extrinsic information, the method further comprises:

the receiving device obtains M fourth cross correlation coefficients, where the M fourth cross correlation coefficients are correlation coefficients between fourth symbol information and M second symbol information, the fourth symbol information is at least one symbol included in the third subcarrier signal, and the M second symbol information includes at least one symbol corresponding to the M first FEC external information, respectively.

9. The method according to claim 8, wherein the receiving device obtains an original signal of the third subcarrier signal according to the first subcarrier signal and the M pieces of first FEC extrinsic information, and includes:

the receiving device determines that a difference value between the fourth symbol information, a fourth target parameter and M fifth target parameters is an original signal of the third subcarrier signal, where the fourth target parameter is a product between a fifth cross-correlation coefficient and the fourth symbol information, the fifth cross-correlation coefficient is a correlation coefficient between the fourth symbol information and the third symbol information, the third symbol information includes at least one symbol corresponding to second FEC external information, the second FEC external information is used to indicate a value of each bit included in the first subcarrier signal, and the M fifth target parameters are products between the M second symbol information and the M fourth cross-correlation coefficients, respectively.

10. The method according to any one of claims 1 to 6, wherein before the receiving device obtains an original signal of the third subcarrier signal according to the first subcarrier signal and the M pieces of first FEC extrinsic information, the method further comprises:

the receiving device obtains M fifth cross correlation coefficients, where the M fifth cross correlation coefficients are correlation coefficients between third phase information and M second phase information, the third phase information is a phase of the third subcarrier signal, and the M second phase information is a phase of the M first FEC external information, respectively.

11. The method according to claim 10, wherein the obtaining, by the receiving device, an original signal of the third subcarrier signal according to the first subcarrier signal and the M pieces of first FEC extrinsic information comprises:

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

and the receiving equipment acquires the original signal of the third subcarrier signal according to the phase of the original signal of the third subcarrier signal.

12. The method according to any of claims 7 to 11, wherein the difference between the amplitude of the third subcarrier signal transmitted by the transmitting device and the amplitude of the third subcarrier signal filtered by the receiving device is greater than or equal to a first preset value; the difference between the amplitude of the first subcarrier signal sent by the sending device and the amplitude of the first subcarrier signal filtered by the receiving device is smaller than the first preset value, and 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.

13. The method according to any of claims 1 to 12, wherein the difference between the carrier frequency of each of the second subcarrier signals and the carrier frequency of the first subcarrier signal is less than or equal to a second preset value.

14. The method according to claim 7 or 12, wherein the difference between the carrier frequency of the first subcarrier signal and the carrier frequency of the third subcarrier signal is smaller than or equal to a second predetermined value, and/or wherein the difference between the carrier frequency of each of the second subcarrier signals and the carrier frequency of the first subcarrier signal is smaller than or equal to the second predetermined value.

15. A network device, comprising: a processor, a memory and a receiver interconnected by a line, the memory and the processor being interconnected by a line, the memory having stored therein instructions, the processor being configured to perform a method as claimed in any one of claims 1 to 14 in relation to processing, the receiver being configured to perform a method as claimed in any one of claims 1 to 14 in relation to receiving.

16. A communication system comprising a transmitting device and a receiving device, wherein the transmitting device is configured to transmit N subcarrier signals to the receiving device, and the receiving device is configured to perform the decoding method according to any one of claims 1 to 14.

17. A computer-readable storage medium comprising instructions that, when executed on a computer, cause the computer to perform the method of any of claims 1 to 14.