CN114553365A

CN114553365A - Encoding method, decoding method, network equipment, system and storage medium

Info

Publication number: CN114553365A
Application number: CN202011347339.0A
Authority: CN
Inventors: 肖治宇
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-11-26
Filing date: 2020-11-26
Publication date: 2022-05-27
Also published as: WO2022111272A1

Abstract

The embodiment of the invention discloses an encoding method, a decoding method, network equipment, a system and a storage medium. The method can improve the error correction capability of decoding the bit stream. The method comprises the following steps: performing first FEC coding on N paths of the first bit stream to obtain a first overhead, where the N paths of the first bit stream include N1 paths of first subcarrier bit streams and N2 paths of second subcarrier bit streams, where N1 is an integer greater than or equal to 1, N2 is a natural number, and N1+ N2 is equal to N; distributing the first overhead to the N1 paths of first subcarrier bit streams to obtain N1 paths of third subcarrier bit streams; transmitting N second bit streams, the N second bit streams comprising the N1 third subcarrier bit streams and the N2 second subcarrier bit streams.

Description

Encoding method, decoding method, network equipment, system and storage medium

Technical Field

The present application relates to the field of communications technologies, and in particular, to an encoding method, 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 evolution of network devices from single carrier to multi-path subcarriers has been an irreversible trend.

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

However, the interference conditions suffered by the signals of the multiple subcarriers are inconsistent in the transmission process. The signals of the sub-carriers with larger interference and the signals of the sub-carriers with smaller interference are all FEC encoded and decoded in the same way. Then the FEC decoding of the signal of the sub-carrier suffering from the larger interference by the receiving device may have a lower error correction capability. The overall error correction capability of the receiving device for FEC decoding of the multi-subcarrier signal is reduced.

Disclosure of Invention

The embodiment of the application provides an encoding method, a decoding method, network equipment, a system and a storage medium, which are used for improving the error correction capability of decoding a bit stream.

In a first aspect, an embodiment of the present invention provides an encoding method, where the method includes: the sending device performs first FEC coding on N first bit streams to obtain a first overhead, where the N first bit streams include N1 first subcarrier bit streams and N2 second subcarrier bit streams, where N1 is an integer greater than or equal to 1, N2 is a natural number, and N1+ N2 is equal to N; the sending equipment distributes the first overhead to the N1 paths of first subcarrier bit streams to obtain N1 paths of third subcarrier bit streams; the transmitting device transmits N secondary bit streams, which include the N1 secondary subcarrier bit streams and the N2 secondary subcarrier bit streams.

It can be seen that the FEC encoding is performed on N first bit streams as shown in this aspect. The N paths of second bit streams are obtained by carrying out FEC coding on the N paths of first bit streams together, so that the error correction capability of decoding the N paths of second bit streams is effectively improved, and the error rate of the N paths of second bit streams is effectively reduced.

Based on the first aspect, in an optional implementation manner, before performing the first FEC encoding on the N first bit streams to obtain the first overhead, the method further includes: and respectively carrying out second FEC encoding on each path of the third bit stream in the N paths of third bit streams to obtain the N paths of first bit streams, wherein the first bit streams comprise second overheads.

As can be seen, in this implementation, FEC encoding is performed twice on the N second bit streams. And performing the first FEC encoding on each path of third bit stream, and performing the second FEC encoding on the N paths of first bit streams. The N paths of second bit streams are obtained by performing FEC encoding on the N paths of third bit streams twice, so that the error correction capability of decoding the N paths of third bit streams is effectively improved, and the error rate of the N paths of third bit streams is effectively reduced.

Based on the first aspect, in an optional implementation manner, the N first bit streams include an edge wave bit stream and a middle wave bit stream, where the first subcarrier bit stream is the edge wave bit stream, and the second subcarrier bit stream is the middle wave bit stream or the edge wave bit stream. Therefore, the N2 paths of second subcarrier bit streams may include both the middle wave bit stream and the side wave bit stream, or may be all the middle wave bit streams or all the side wave bit streams. For example, when N is 2, and N1 and N2 are each 1, the first bit stream includes only two bit streams, and both bit streams are side wave bit streams, and then N2 second subcarrier bit streams include one side wave bit stream.

In this embodiment, the N first bit streams specifically include a mid-wave bit stream and a side-wave bit stream. The intermediate wave bit stream represents a bit stream which is included in the N first bit streams and is less interfered. The side wave bit stream represents a bit stream which is included in the N first bit streams and is relatively interfered.

Here, the bit stream of the side wave that is relatively greatly interfered means a bit stream that is more greatly interfered by channel noise and/or crosstalk. A medium wave bit stream that is less disturbed refers to a bit stream that is less subject to channel noise and/or crosstalk.

In an optional implementation manner, based on the first aspect, the carrier frequency of the side wave bitstream is smaller than the carrier frequency of the middle wave bitstream, or the carrier frequency of the side wave bitstream is larger than the carrier frequency of the middle wave bitstream.

It can be seen that the third sub-carrier bit stream is subject to more interference than the second sub-carrier bit stream. The third subcarrier bit stream with large interference is subjected to two FEC encoding processes, so that double error code protection of the third subcarrier bit stream is realized. The error correction capability of decoding the third subcarrier bit stream is improved. The balance of the error correction capability of the receiving device for decoding the N paths of third bit streams is ensured.

Based on the first aspect, in an optional implementation manner, the allocating the second overhead to the N1 paths of first subcarrier bit streams to obtain N1 paths of third subcarrier bit streams includes: dividing the second overhead into N1 sub-overheads; the N1 sub-overheads are respectively allocated to the N1 channels of first sub-carrier bit streams to obtain N1 channels of third sub-carrier bit streams, where each channel of third sub-carrier bit streams in the N1 channels of third sub-carrier bit streams includes one sub-overhead.

It can be seen that the N1 paths of third carrier bit streams with relatively large interference include both the first overhead and the second overhead, thereby implementing dual error protection for the third subcarrier bit stream.

Based on the first aspect, in an optional implementation manner, each path of the third bit stream includes a first overhead generated by performing the first FEC encoding on each path of the first bit stream, where a number of bits included in the first overhead included in the third subcarrier bit stream is greater than a number of bits included in the first overhead included in the second subcarrier bit stream.

It can be seen that, under the condition that the interference suffered by the third subcarrier bit stream is greater than the interference suffered by the second subcarrier bit stream, the sending device adopts different first FEC coding modes for the third subcarrier bit stream and the second subcarrier bit stream. So that the number of bits contained in the second overhead corresponding to the third subcarrier bit stream is greater than the number of bits contained in the second overhead corresponding to the second subcarrier bit stream, thereby ensuring that the receiving device has stronger error correction capability for the third subcarrier bit stream based on the larger second overhead.

Based on the first aspect, in an optional implementation manner, the performing, by the first FEC, first FEC encoding on the N paths of the first bit streams to obtain a first overhead includes: merging the N paths of first bit streams to obtain merged bit streams; the first FEC encoding is performed on the merged bitstream to obtain the first overhead.

Based on the first aspect, in an optional implementation manner, the performing, by the first FEC, first FEC encoding on the N paths of the first bit streams to obtain a first overhead includes: carrying out interleaving coding on the N paths of first bit streams to obtain interleaved coded bit streams; the first FEC encoding is performed on the interleaved encoded bit stream to obtain the first overhead.

It can be seen that all payloads and first overheads included in the N paths of first bit streams are in a uniformly distributed distribution state in the interleaved and encoded bit streams, thereby effectively improving the accuracy of decoding the N paths of second bit streams.

In a second aspect, an embodiment of the present invention provides a decoding method, where the method includes: receiving N paths of second bit streams, wherein the N paths of second bit streams comprise N1 paths of third subcarrier bit streams and N2 paths of second subcarrier bit streams, N1 is an integer which is greater than or equal to 1, N2 is a natural number, and N1+ N2 is equal to N; the N1 paths of third subcarrier bit streams comprise N1 paths of first subcarrier bit streams and a first overhead; performing first FEC decoding on the N2 paths of second subcarrier bit streams and the N1 paths of third subcarrier bit streams to obtain N2 paths of second subcarrier bit streams after the first FEC decoding and N1 paths of third subcarrier bit streams after the first FEC decoding; performing second FEC decoding on each path of the first FEC-decoded third subcarrier bit stream to obtain a second FEC-decoded third subcarrier bit stream; and performing the first FEC decoding on the N2 paths of first FEC-decoded second subcarrier bit streams and the N1 paths of second FEC-decoded third subcarrier bit streams to obtain N paths of first bit streams.

It can be seen that, with the decoding method shown in the present aspect, the receiving device performs the first FEC decoding on the third subcarrier bit stream with relatively large interference and the second subcarrier bit stream with relatively low error rate in common. It is helpful to improve the error correction capability of decoding the third subcarrier bit stream by the second subcarrier bit stream having a comparatively low error rate. And performing second FEC decoding on each path of the third subcarrier bit stream after the first FEC decoding, so that the second subcarrier bit stream after the second FEC decoding with a lower error rate can be obtained. And the receiving device performs the first FEC decoding on the first FEC-decoded second subcarrier bit stream and the second FEC-decoded third subcarrier bit stream together. It is helpful to improve the error correction capability of decoding the N2 paths of first FEC decoded second subcarrier bit streams by the second FEC decoded third subcarrier bit stream with a relatively low error rate. It can be seen that the number of erroneous bits comprised by the third bit stream is effectively reduced.

In addition, the method and the device can break through the mathematical constraint of FEC decoding, improve the accuracy of decoding the N paths of second bit streams, improve the error correction capability of the receiving device in decoding the N paths of second bit streams, and ensure the balance of the error correction capability of the receiving device in decoding the N paths of second bit streams.

Based on the second aspect, in a possible implementation manner, before performing the first FEC decoding on the N2 routes of second subcarrier bit streams and the N1 routes of third subcarrier bit streams, the method further includes: and performing second FEC decoding on each path of second subcarrier bit stream to obtain second subcarrier bit streams after the second FEC decoding.

Based on the second aspect, in an optional implementation manner, the N first bit streams include a side wave bit stream and a middle wave bit stream, where the first subcarrier bit stream is the side wave bit stream, and the second subcarrier bit stream is the middle wave bit stream or the side wave bit stream. Therefore, the N2 paths of second subcarrier bit streams may include both the middle wave bit stream and the side wave bit stream, or may be all the middle wave bit streams or all the side wave bit streams. For example, when N is 2, and N1 and N2 are each 1, the third bit stream includes only two bit streams, and both bit streams are side-wave bit streams, and in this case, the N2 second subcarrier bit streams include one side-wave bit stream.

In an alternative implementation manner, the carrier frequency of the side-wave bitstream is smaller than the carrier frequency of the middle-wave bitstream, or the carrier frequency of the side-wave bitstream is larger than the carrier frequency of the middle-wave bitstream.

Based on the second aspect, in an optional implementation manner, each path of the third subcarrier bit stream includes a sub-overhead, and N1 sub-overheads included in the N1 paths of the third subcarrier bit stream form the first overhead.

Based on the second aspect, in an optional implementation manner, the number of bits included in the first overhead B included in the third subcarrier bitstream is greater than the number of bits included in the first overhead included in the second subcarrier bitstream.

Based on the second aspect, in an optional implementation manner, the method further includes: equalizing each path of the third subcarrier bit stream to obtain a third subcarrier bit stream after the first equalization; the performing the first FEC decoding on the N2 th secondary subcarrier bit streams and the N1 th tertiary subcarrier bit streams includes: and performing first FEC decoding on the N2 paths of second subcarrier bit streams and the N1 paths of third subcarrier bit streams after the first equalization processing.

Therefore, the third subcarrier bit stream with larger interference is subjected to equalization processing, so that the error rate of the third subcarrier bit stream is further reduced, and the error correction capability of decoding the third subcarrier bit stream is improved.

Based on the second aspect, in an optional implementation manner, the method further includes: equalizing each path of the third subcarrier bit stream after the first FEC decoding to obtain a second equalized third subcarrier bit stream; the second FEC decoding the third subcarrier bit stream after each path of the first FEC decoding includes: and performing the second FEC decoding on each of the second equalized third subcarrier bit streams.

Therefore, the third subcarrier bit stream with larger interference is equalized twice, so that the accuracy of decoding the third subcarrier bit stream is effectively improved.

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 the steps associated with the processing of either the first aspect or the second aspect. The interface circuit is configured to perform the steps associated with transceiving the bitstream of any of the first or second aspects.

In a fourth aspect, an embodiment of the present invention provides a network device, including: a processor, a memory and a transceiver 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 the steps associated with the process as in any one of the first aspect or the second aspect. The transceiver is configured to perform the steps of any one of the first aspect or the second aspect relating to transceiving a bitstream.

In a fifth aspect, an embodiment of the present invention provides a communication system, including a sending device and a receiving device, where the sending device is configured to execute the encoding method shown in any one of the first aspects, and the receiving device is configured to execute the decoding method shown in any one of the second aspects.

In a sixth aspect, embodiments of the present invention provide a computer-readable storage medium, including instructions, which when executed on a computer, cause the computer to perform the method of any one of the first or second aspects.

In a seventh aspect, an embodiment of the present invention provides a computer program product containing instructions, which when run on a computer, cause the computer to perform the method of any one of the first or second aspects.

By the scheme shown in the application, in the process of performing coding on the N paths of first bit streams, the sending device can perform FEC coding on the N paths of first bit streams twice to obtain N paths of third bit streams. The first FEC coding is that the sending device performs first FEC coding on the N first bit streams respectively to obtain N second bit streams. And the second FEC encoding is to carry out second FEC encoding on the N second bit streams of the sending equipment together. In the encoding process, by means of performing FEC encoding on N paths of first bit streams twice, the sending device can effectively improve the error correction capability of decoding the N paths of first bit streams regardless of the interference condition of each path of bit streams in the N paths of first bit streams, and balance of the error correction capability of decoding the N paths of third bit streams by the receiving device is ensured.

In the process of decoding the N paths of third bit streams, the receiving device first assists the third subcarrier bit stream to decode through the second subcarrier bit stream with a relatively low bit error rate. Specifically, the receiving device performs second FEC decoding on each path of second subcarrier bit stream to obtain a second subcarrier bit stream after the second FEC decoding. The receiving device performs the first FEC decoding on the N2 channels of second subcarrier bit streams after the second FEC decoding and the N1 channels of third subcarrier bit streams to obtain N2 channels of first FEC decoded second subcarrier bit streams and N1 channels of first FEC decoded third subcarrier bit streams. And then, the third subcarrier bit stream with a lower bit error rate is used for assisting the second subcarrier bit stream in decoding. Specifically, the receiving device performs second FEC decoding on each path of the first FEC-decoded third subcarrier bit stream to obtain a second FEC-decoded third subcarrier bit stream. And performing the first FEC decoding on the N2 paths of first FEC-decoded second subcarrier bit streams and the N1 paths of second FEC-decoded third subcarrier bit streams to obtain N paths of first bit streams. Therefore, the number of error bits included in the first bit stream obtained after decoding by the receiving device is effectively reduced.

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 exemplary embodiment of a coding/decoding method according to the present application;

FIG. 3 is an exemplary diagram of an N-way bit stream provided herein;

FIG. 4 is a flowchart illustrating a second embodiment of a coding/decoding method according to the present application;

FIG. 5 is a diagram illustrating an exemplary structure of a processing circuit according to an embodiment of the present disclosure;

fig. 6 is a diagram illustrating a structure of an embodiment of a transmitting device provided in the present application;

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

fig. 8 is a diagram illustrating a second exemplary structure of a receiving device provided in the present application;

fig. 9 is a diagram illustrating a structure of a network device according to an embodiment of 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 by the present application, a communication system to which the method shown in the prior art is applied will be described first.

The communication system shown in fig. 1 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 for example, N is a positive integer greater than 1.

The transmitting device 110 includes N FEC encoding modules, i.e., FEC encoding module 1, FEC encoding module 2 through 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 modulators 111 included in the transmitting device 110 are connected to the N FEC encoding modules, respectively. The modulator 111 is configured to modulate the received N encoded bit streams 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 comprised by the receiving device 120 receives the 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 RXc1, RXc2 to RXcN.

The receiving apparatus 120 includes N FEC decoding modules, i.e., FEC decoding module 1, FEC decoding module 2 through FEC decoding module N, connected to the demodulator 121. The N FEC decoding modules respectively perform FEC decoding on the N demodulated bit streams to obtain decoded N bit streams, that is, decoded bit streams RXd1, RXd2 to RXdN. For example, the FEC decoding module N FEC decodes the demodulated bitstream RXcN to obtain a decoded bitstream RXdN.

As can be seen, the transmitting device 110 shown in the prior art performs FEC coding on N bit streams respectively to obtain coded bit streams TXb1, TXb2 to TXbN. The interference experienced by the encoded bitstreams TXb1, TXb2 through TXbN during transmission to the receiving device 120 is different. For example, the encoded bitstreams TXb1 and TXbN are subjected to more interference than the encoded bitstreams TXb2 through TXbN-1.

The receiving device 120 performs FEC decoding on the N bit streams, so that the bit stream with relatively high interference has a relatively low error correction capability compared to the bit stream with relatively low interference, which reduces the overall error correction capability of the receiving device for performing FEC decoding on the N bit streams, and further reduces the accuracy of performing FEC decoding on the N bit streams by the receiving device.

Wherein, the error correction capability refers to the capability of finding out the error bit in the bit stream. Specifically, if the bitstream includes N error bits, M error bits are found in the bitstream by decoding. The closer the value M is to the value N, the stronger the error correction capability is. If the value M is farther away from the value N, the fault-connecting capability is weak.

In summary, the present application provides a coding and decoding method, and with the method shown in the present application, a sending device can adopt different coding methods for a bit stream with relatively large interference and for a bit stream with relatively small interference. The receiving device can also adopt different decoding methods for bit streams with large interference and for bit streams with small interference. Therefore, the error correction capability of the receiving device for decoding the bit stream with larger interference is effectively improved, the balance of the error correction capability of the receiving device for decoding the N paths of bit streams is effectively realized, and the integral error correction capability of the receiving device for decoding the N paths of bit streams is improved. The following describes the implementation of the method shown in this embodiment with reference to fig. 2:

step 201, the sending device performs first FEC coding on each path of first bit stream to obtain a second bit stream.

The sending device obtains N first bit streams to be sent to the receiving device, and the specific value of N is not limited in this embodiment. For example, as shown in fig. 3, N first bit streams to be transmitted to the receiving device by the transmitting device are a first bit stream 1, a first bit stream 2, and a first bit stream N.

Optionally, the sending device separately performs the first FEC encoding on each of the N first bit streams 310 to obtain N second bit streams 320. For example, the transmitting device performs the first FEC encoding on the first bit stream N alone to obtain the second bit stream.

Specifically, after performing first FEC encoding on each path of first bit stream, the sending device generates a first overhead, where the first overhead is used for performing FEC decoding. It can be seen that each of the second bit streams includes the first overhead.

Several alternative ways of setting the first overhead shown in this embodiment are described below:

mode 1

The transmitting device shown in this embodiment obtains the first overheads with the same size for each of the N first bit streams by the same first FEC coding method.

The transmitting device performs the first FEC encoding on the first bit stream 1 to obtain the first overhead M1. By analogy, the sending device performs the first FEC encoding on the first bit stream N to obtain the first overhead MN. As can be seen, the sending device performs first FEC coding on the N first bit streams respectively to obtain N first overheads, where the number of bits included in the N first overheads is all equal.

Mode 2

In this way, the size of the first overhead included in the second bit stream can be determined according to the situation that each path of the first bit stream is interfered, which is specifically described as follows:

in this embodiment, the N first bit streams 310 specifically include a mid-wave bit stream and a side-wave bit stream. The intermediate wave bit stream is a bit stream that is included in the N first bit streams 310 and is less interfered. The side wave bit stream is a bit stream that is included in the N first bit streams 310 and is relatively interfered.

The following describes an exemplary distribution manner of the mid-wave bit stream and the side-wave bit stream in the N first bit streams. It should be clear that the description of the number of the middle wave bit stream and the side wave bit stream and the carrier frequency in this embodiment is an optional example, and is not limited as long as the interference suffered by the middle wave bit stream is smaller than the interference suffered by the side wave bit stream.

The N first bit streams shown in this embodiment include a plurality of side wave bit streams. The multi-path side wave bit stream comprises at least one path of first side wave bit stream and at least one path of second side wave bit stream. The carrier frequency of the first sideband bitstream is greater than the carrier frequency of the intermediate wave bitstream. The carrier frequency of the second sideband wave bit stream is less than the carrier frequency of the mid wave bit stream.

The number of the first side wave bit stream and the second side wave bit stream shown in this embodiment are both one path. In other examples, the first sideband bit stream and the second sideband bit stream can be multiplexed separately. The number of the intermediate wave bit streams shown in the present mode is at least one path.

For example, the N-way first bit stream 310 shown in fig. 3 specifically includes a first bit stream 1, a first bit stream 2, and a first bit stream N. Wherein the first bitstream 1 is a first sideband bitstream. The first bit stream N is a second sideband bit stream. And the first bit stream 2 to the first bit stream N-1 are intermediate wave bit streams.

It can be seen that the carrier frequency of the first bit stream 1 is greater than the carrier frequency of any of the first bit stream 2 to the first bit stream N-1. The carrier frequency of the first bit stream N is less than the carrier frequency of any of the first bit stream 2 to the first bit stream N-1.

Under the condition that the interference on the side wave bit stream is greater than that on the middle wave bit stream, the sending equipment adopts different first FEC coding modes for the middle wave bit stream and the side wave bit stream, so that the first overhead corresponding to the middle wave bit stream is smaller than that corresponding to the side wave bit stream, and the receiving equipment is ensured to have stronger error correction capability on the side wave bit stream based on the larger first overhead.

As can be seen, the transmitting device performs the first FEC encoding on the first bit stream 1 and the first bit stream N, respectively, to generate the first overhead T1. The transmitting apparatus performs first FEC encoding on the first bit stream 2 through the first bit stream N-1, respectively, to generate second overhead T2, respectively. The number of bits included in the first overhead T1 is greater than the number of bits included in the first overhead T2.

Specifically, the transmitting device performs first FEC encoding on each H1 kilobits (kbit) of data in each side wave bit stream to generate a first overhead. The sending device may obtain a second bitstream that includes the sideband bitstream and a first overhead corresponding to the sideband bitstream.

For example, the transmitting device performs first FEC encoding on the first bit stream 1 to generate a first overhead T1. The transmitting device obtains a second bit stream 321. The second bit stream 321 includes the first bit stream 1 and a first overhead T1 corresponding to the first bit stream 1. By analogy, the transmitting apparatus performs the first FEC encoding on the first bit stream N to generate the first overhead T1. The transmitting device obtains a second bitstream 322. The second bit stream 322 includes the first bit stream N and a first overhead T1 corresponding to the first bit stream N.

The transmitting device performs a first FEC encoding for each H2 kbit data in each of the intermediate wave bit streams to generate a first overhead T2. The transmitting device may obtain a second bit stream including the intermediate wave bit stream and the first overhead T2 corresponding to the intermediate wave bit stream.

For example, the transmitting apparatus performs the first FEC encoding on the first bit stream 2 to generate the first overhead T2. The transmitting device obtains a second bitstream 323. The second bitstream 323 includes the first bitstream 2 and a first overhead T2 corresponding to the first bitstream 2. By analogy, the transmitting device performs a first FEC encoding on the first bit stream N-1 to generate a first overhead T2. The transmitting device obtains a second bitstream 324. The second bit stream 324 includes the first bit stream N-1 and a first overhead T2 corresponding to the first bit stream N-1.

Optionally, the first overhead T2 corresponding to the middle wave bitstream is smaller than the first overhead T1 corresponding to the side wave bitstream. In order for the sending device to guarantee that the bandwidths of the multiple bit streams sent to the receiving device are consistent, the sending device may guarantee that H1 is less than H2.

The present embodiment exemplifies an arrangement mode in which the first overhead is the above-described mode 2.

Step 202, the sending device performs the second FEC coding on the N paths of second bit streams together to obtain the second overhead.

Several alternative ways for the sending device to obtain the second overhead shown in this embodiment are exemplarily described below:

mode 1

And the sending equipment combines the N paths of second bit streams to obtain a combined bit stream. Specifically, the sending device sequentially connects the N second bit streams end to form the merged bit stream. For example, the transmitting device concatenates the last byte included in the second bitstream 321 with the first byte included in the second bitstream 323 to achieve concatenation of the second bitstream 321 and the second bitstream 323. And the rest is repeated until the last byte included in the second bit stream N-1 is connected with the first byte included in the second bit stream N to obtain the merged bit stream.

The transmitting device performs a second FEC encoding on the merged bitstream to obtain the second overhead.

Mode 2

And the sending equipment carries out interleaving coding on the N paths of second bit streams to obtain interleaved coded bit streams.

In particular, the bits in which errors occur are often consecutive in the signal transmitted by the transmitting device to the receiving device. However, FEC coding is only effective when detecting and correcting a single bit or a bit string that is not too long. To solve this problem, it is desirable to spread out the successive bits in the bit stream. Therefore, even if bit errors occur in a string during transmission, the accuracy of decoding the bit stream is effectively improved because the bits with errors received by the receiving equipment are in a dispersed state. This technique of spreading the bits included in the bit stream to be transmitted is an interleaving encoding technique.

Therefore, the present embodiment uses the interleaving coding to discretize a longer burst error in the N second bit streams into a random error, and uses the second FEC coding to eliminate the random error. Therefore, the reliability of the communication system can be effectively improved by combining the interleaving coding and the second FEC coding.

More specifically, after interleaving and encoding the N second bit streams, the transmitting device can shuffle the order of each second bit stream in the N second bit streams, and the distribution of all payloads and first overheads included in the N second bit streams. Therefore, all payloads and first overheads included in the N second bit streams are distributed uniformly in the interleaved and coded bit streams.

The transmitting device performs the second FEC encoding on the interleaved encoded bit stream to obtain the second overhead.

Step 203, the sending device allocates the second overhead to the N1 channels of first subcarrier bit streams to obtain N1 channels of third subcarrier bit streams.

The N second bit streams shown in this embodiment include N1 first subcarrier bit streams and N2 second subcarrier bit streams. Wherein N1 is an integer greater than or equal to 1, N2 is a natural number, and N1+ N2 is equal to N. In this embodiment, the value of N2 is exemplified as an integer greater than or equal to 1. In other examples, if the value of N2 is 0, it indicates that only the first subcarrier bitstream is included in the N second bitstreams.

The transmitting apparatus shown in the present embodiment is configured to allocate the second overhead to the N1-path first subcarrier bit stream and not to allocate the second overhead to the N2-path second subcarrier bit stream.

The N paths of second bit streams shown in this embodiment include side wave bit streams and middle wave bit streams, and for specific description of the side wave bit streams and the middle wave bit streams, please refer to step 201 above, which is not described in detail.

In order to improve the error correction capability for decoding the side wave bit stream with relatively large interference, the N1 paths of first subcarrier bit streams shown in this embodiment are all side wave bit streams included in the N paths of second bit streams. The transmitting device may allocate the second overhead to all of the sideband bitstreams. The N2 paths of second subcarrier bit streams are all the wavelet bit streams included in the N paths of second bit streams. The transmitting device need not allocate this second overhead to the intermediate wave bit stream.

For example, of the N second bit streams, the second bit stream 321 and the second bit stream 322 are edge wave bit streams. It can be seen that the second bit stream 321 and the second bit stream 322 are both first subcarrier bit streams. In this example, the value of N1 is 2. The transmitting device allocates the second overhead to the second bit stream 321 and the second bit stream 322.

For another example, the N second bit streams, the second bit stream 323 to the second bit stream 324, are all intermediate wave bit streams. It can be seen that the second bit stream 323 to 324 are all second subcarrier bit streams. The transmitting device does not need to allocate the second overhead to the second bit stream 323 to the second bit stream 324.

It should be clear that, in the present embodiment, in the N second bit streams, all the edge wave bit streams are the first subcarrier bit streams. All the intermediate wave bit streams are the second subcarrier bit stream for exemplary illustration and are not limited. As long as the transmitting device determines that, of the N second bit streams, a part of the second bit stream is the first subcarrier bit stream and the remaining part of the second bit stream is the second subcarrier bit stream.

For example, the transmitting device may determine that a portion of the side-wave bit stream is the first subcarrier bit stream from the N second bit streams. And the remaining side wave bit stream and all of the mid wave bit streams are second subcarrier bit streams. The sideband bitstream 321 shown in fig. 3 is a first subcarrier bitstream, while the sideband bitstream 322 and all intermediate wave bitstreams are second subcarrier bitstreams.

For another example, the transmitting device determines that, in the N second bit streams, all the edge wave bit streams and a part of the middle wave bit stream are first subcarrier bit streams, and the remaining part of the middle wave bit stream is a second subcarrier bit stream.

The following describes how the transmitting device specifically allocates the second overhead to the N1-path first subcarrier bit stream:

the transmitting device divides this second overhead into N1 sub-overheads. As can be seen from the above description, N1 is the number of first subcarrier bit streams.

The transmitting device allocates N1 sub-overheads to N1 first subcarrier bit streams, respectively, to obtain N1 third bit streams. It can be seen that each third subcarrier bit stream includes one first subcarrier bit stream and one overhead subcarrier. And the different third subcarrier bit stream comprises a different first subcarrier bit stream.

For example, in the N second subcarrier bitstreams, the transmitting device has determined that the second bitstreams 321 and 322 are the first subcarrier bitstreams. It can be seen that the value of N1 is 2. The transmitting device divides the second overhead into 2 sub-overheads. The first subcarrier bit stream 321 and one subcarrier overhead constitute a third subcarrier bit stream 331. The first subcarrier bit stream 322 and the further subcarrier bit stream constitute a third subcarrier bit stream 332.

It can be seen that this embodiment can carry the second overhead through N1 paths of third subcarrier bit streams, so as to improve the error correction capability of the receiving device on the side wave bit stream with relatively large interference.

In this embodiment, the transmitting device may divide the second overhead into N1 sub-overheads on average. Where the size of the N1 sub-overheads is the same. For example, the size of the second overhead is 2M bits. The sending device divides the second overhead of 2M bit size into 2 sub-overheads, and the size of each sub-overhead is 1M bit. The transmitting device allocates a sub-overhead having a size of 1M bit in each third sub-carrier bit stream.

It should be clear that, in the present embodiment, the size of each sub overhead is the same as an example, and in other examples, the size of different sub overheads may be different.

With the steps shown above, the transmitting device can perform FEC encoding on the N first bit streams 310 twice, i.e., first FEC encoding and second FEC encoding. Through two FEC encoding, double error code protection can be performed on the N paths of first bit streams 310, the error correction capability of decoding the N paths of first bit streams 310 is improved, the balance of the error correction capability of decoding the N paths of bit streams by receiving equipment is ensured, and the integral error correction capability of decoding the N paths of bit streams by the receiving equipment is improved.

And step 204, the sending equipment sends N paths of third bit streams to the receiving equipment.

The N third bit streams 330 shown in this embodiment include N1 third subcarrier bit streams and N2 second subcarrier bit streams, and for specific descriptions of the N1 third subcarrier bit streams and the N2 second subcarrier bit streams, please refer to the above steps for details, which are not described herein.

The transmitting device modulates the N third bit streams onto N subcarriers to transmit the N subcarriers to the receiving device.

Optionally, in this embodiment, to improve accuracy and efficiency of the receiving device decoding the N third bit streams, bandwidths of the N third subcarrier bit streams shown in this embodiment are the same.

In step 205, the receiving device obtains N2 paths of first FEC decoded second subcarrier bit streams.

The receiving device demodulates the received N subcarriers to obtain N third bit streams. And the receiving equipment performs first FEC decoding on each path of second subcarrier bit stream included in the N paths of third bit streams to obtain N2 paths of first FEC-decoded second subcarrier bit streams. The following describes a specific procedure for performing the first FEC decoding on each second subcarrier bitstream:

first, when the receiving apparatus receives N third bit streams, the receiving apparatus determines N1 third subcarrier bit streams and N2 second subcarrier bit streams included in the N third bit streams. Specifically, the transmitting device and the receiving device shown in this embodiment may agree in advance on specific positions of the third subcarrier bit stream and the second subcarrier bit stream in the N paths of third bit streams. For example, the transmitting device and the receiving device may agree that, in the N third bit streams, the third bit stream 1 and the third bit stream N are third subcarrier bit streams, respectively. And in the N paths of third bit streams, a third bit stream 2 to a third bit stream N-1 are second subcarrier bit streams respectively.

Secondly, the receiving device performs first FEC decoding on each determined path of second subcarrier bit stream to obtain a first decoded second subcarrier bit stream. As can be seen, the receiving device performs first FEC decoding on the intermediate wave bit stream included in the second subcarrier bit stream and the first overhead corresponding to the intermediate wave bit stream to obtain the second subcarrier bit stream after the first FEC decoding. Specifically, the receiving device performs first FEC decoding on each determined path of second subcarrier bit stream based on the first overhead to obtain a first decoded second subcarrier bit stream.

Continuing with fig. 3, the receiving device determines the third bit stream 333 comprised by the N third bit streams 330 to be a second subcarrier bit stream. The receiving device may perform first FEC decoding on the H2 kbit data included in the second subcarrier bit stream 333 and the corresponding first overhead, and then obtain the second subcarrier bit stream after the first FEC decoding. Wherein the bit error rate of the second subcarrier bit stream after the first decoding is lower than that of the second subcarrier bit stream.

In step 206, the receiving device obtains N2 second FEC decoded second subcarrier bit streams and N1 second FEC decoded third subcarrier bit streams.

Specifically, the receiving device shown in this embodiment performs second FEC decoding on the N2 paths of first FEC-decoded second subcarrier bit streams and the N1 paths of third subcarrier bit streams together based on the first overhead and the second overhead, so as to obtain N2 paths of second-decoded second subcarrier bit streams and N1 paths of first-decoded third subcarrier bit streams.

As shown in fig. 3, the receiving device performs the second FEC decoding on all the third subcarrier bit streams and all the first decoded second subcarrier bit streams jointly to obtain N1 channels of second decoded second subcarrier bit streams and N1 channels of first decoded third subcarrier bit streams.

In this embodiment, because the interference on the second subcarrier bit stream is relatively small, the number of error bits in the second subcarrier bit stream is relatively small. In step 205, the receiving device can obtain the first decoded second subcarrier bit stream with a low bit error rate.

The receiving device performs the second FEC decoding on the N1 paths of third subcarrier bit streams with relatively large interference and the N2 paths of first decoded second subcarrier bit streams with relatively low error rates together, which helps to improve the error correction capability of decoding the third subcarrier bit streams by the first decoded second subcarrier bit streams with relatively low error rates. Thereby further reducing the number of erroneous bits comprised by the second sub-carrier bit stream after the second decoding and the third sub-carrier bit stream after the first decoding.

The reason why the second subcarrier bit stream is FEC decoded twice to improve the error correction capability is explained as follows:

if one path of second subcarrier bit stream includes D1 error bits, after the first FEC decoding is performed on the second subcarrier bit stream, E1 error bits can be found out from the second subcarrier bit stream. Wherein E1 is less than D1. Then the D1-E1 error bits are not found in the second subcarrier bit stream.

If the second subcarrier bit stream is subjected to the first FEC decoding once or more times, due to the mathematical constraint of the first FEC decoding, more error bits cannot be found in the second subcarrier bit stream based on the first FEC. It can be seen that D1-E1 error bits are not found in the second subcarrier bit stream.

In the method shown in this embodiment, after the first FEC decoding is performed on the second subcarrier bit stream, the second FEC decoding may be performed on the second subcarrier bit stream after the first FEC decoding is performed, so as to obtain the second subcarrier bit stream after the second FEC decoding.

It can be seen that the decoding targets for the second FEC decoding (N2 passes of the second subcarrier bitstream after the first decoding and N1 passes of the third subcarrier bitstream) are different from the decoding targets for the first FEC decoding (N2 passes of the second subcarrier bitstream). For the second subcarrier bit stream, the second FEC decoding may break the mathematical constraint of the first FEC decoding, so that when the second subcarrier bit stream is not found after the first FEC decoding, the D1-E1 error bits are further found through the second FEC decoding, and E2 error bits can be further found through the second FEC decoding. Wherein E2 is less than D1. It can be seen that the second subcarrier bit stream is left with only D1-E1-E2 error bits after the second FEC decoding.

It can be seen that, through the FEC decoding twice in this embodiment, the error correction capability of the second subcarrier bit stream can be effectively improved, and the error rate of the second subcarrier bit stream is reduced.

And step 207, the receiving device acquires N1 paths of second decoded third subcarrier bit streams.

Specifically, the receiving device performs first FEC decoding on each path of the first decoded third subcarrier bit stream to obtain a second decoded third subcarrier bit stream.

In this embodiment, in order to improve the error correction capability of the third subcarrier bit stream with relatively large interference, FEC decoding needs to be performed on the third subcarrier bit stream twice. The first FEC decoding is shown as step 206 and the second FEC decoding is shown as step 207.

The reason why the error correction capability is improved by FEC decoding the third subcarrier bit stream twice is described as follows:

if one path of third subcarrier bit stream includes D2 error bits, second FEC decoding is performed on the third subcarrier bit stream. E3 error bits can be found from the third subcarrier bit stream. Wherein E3 is less than D2. Then the D2-E3 more erroneous bits in the third subcarrier bit stream are not found.

If the third subcarrier bit stream is subjected to the second FEC decoding once or more times, due to mathematical constraints of the second FEC decoding, more error bits cannot be found in the third subcarrier bit stream based on the second FEC. It can be seen that D2-E3 error bits are not found in the third subcarrier bit stream.

In the method shown in this embodiment, after performing the second FEC decoding on the third subcarrier bit stream, the first FEC decoding may be performed on the third subcarrier bit stream to obtain the second decoded third subcarrier bit stream.

It can be seen that the decoding targets for the second FEC decoding (N2 passes of the second subcarrier bitstream after the first decoding and N1 passes of the third subcarrier bitstream) are different from the decoding targets for the first FEC decoding (N1 passes of the third subcarrier bitstream after the first decoding). For the third subcarrier bitstream, the first FEC decoding may break the mathematical constraint of the second FEC decoding, so that when the third subcarrier bitstream is subjected to the first FEC decoding and D2-E3 error bits are not found, E4 error bits are further found by the first FEC decoding. Wherein E4 is less than D2. It can be seen that the third subcarrier bitstream is left with only D2-E3-E4 error bits after the first FEC decoding.

Therefore, the error correction capability of the third subcarrier bit stream can be effectively improved through two FEC decoding.

And step 208, the receiving device acquires N paths of first bit streams.

Specifically, the receiving device shown in this embodiment performs the second FEC decoding on the N2 channels of second-decoded second subcarrier bit streams and the N1 channels of second-decoded third subcarrier bit streams together to obtain N channels of first bit streams.

As shown in step 207, the receiving device can obtain the second decoded third subcarrier bit stream with a lower bit error rate. The receiving device further performs, as shown in step 208, a second FEC decoding on the N2 channels of second-decoded second subcarrier bit streams and the N1 channels of second-decoded third subcarrier bit streams, so as to help decode the second-decoded second subcarrier bit stream through the second-decoded third subcarrier bit stream with a relatively low bit error rate, thereby further reducing the bit error rate of the second subcarrier bit stream, and improving the error correction capability of the receiving device on the second subcarrier bit stream.

Optionally, the receiving device shown in this embodiment may return to step 205 after acquiring the N first bit streams. As can be seen, the receiving device effectively improves the accuracy of decoding the N first bit streams by repeating the FEC decoding process from step 205 to step 207.

Optionally, after obtaining the N first bit streams, the receiving device shown in this embodiment may separately perform first FEC decoding on the N first bit streams to obtain N first FEC decoded first bit streams. The receiving device determines whether it needs to return to step 205 by means of decision on the N first FEC decoded first bit streams. If the decision is successful, it indicates that the receiving device successfully decodes the N first bit streams, and it is not necessary to return to step 205. If the decision fails, it indicates that the receiving device fails to decode the N first bit streams, and it needs to return to step 205 to perform decoding again.

The present embodiment does not limit the specific manner of the decision. For example, the decision may be a hard decision or a soft decision. Wherein, the hard decision is to simply set a threshold value to determine the value of each bit of each path of the first bit stream. In terms of binary, it is generally determined that the value of the bit is 1 when the value is greater than 0, and is determined to be 0 when the value is less than 0. The soft decision is to quantize each bit of each path of first bit stream into N values, and calculate by probability what the most likely original value of each value is.

The present embodiment takes an example in which the sideband bit stream on the transmitting apparatus side includes data to be transmitted to the receiving apparatus. In other examples, data to be transmitted to the receiving device may be allocated only to the mid-wave bitstream, while data transmitted to the receiving device is not included in the side-wave bitstream. Therefore, by adopting the example, the data to be sent is not carried in the side wave bit stream, and the error rate of the data to be sent is reduced.

By adopting the method shown in the embodiment, the error correction capability of the receiving device for decoding the N paths of third bit streams is improved. The balance of the error correction capability of the receiving device for decoding the N paths of third bit streams is ensured, so that the integral error correction capability of the receiving device for decoding the N paths of bit streams is improved. And on the receiving device side, the overhead included in the third subcarrier bit stream is different from the overhead included in the second subcarrier bit stream, so that the convergence speed is higher in the decoding process, and the better error correction capability is obtained.

A second embodiment of the method provided by the present application is described below with reference to fig. 4, and with the method shown in this embodiment, the error correction capability of the receiving device for FEC decoding on the N third bit streams can be further improved, and the specific implementation process is as follows:

step 401, the sending device performs first FEC coding on each path of first bit stream to obtain a second bit stream.

Step 402, the sending device performs a second FEC encoding on the N second bit streams together to obtain a second overhead.

Step 403, the sending device allocates the second overhead to N1 channels of first subcarrier bit streams to obtain N1 channels of third subcarrier bit streams.

Step 404, the sending device sends N third bit streams to the receiving device.

Step 405, the receiving device obtains N2 paths of first decoded second subcarrier bit streams.

For a description of the execution process from step 401 to step 405 in this embodiment, please refer to step 201 to step 205 in fig. 2 in detail, and the detailed execution process is not described herein again.

And step 406, the receiving device obtains N1 paths of third subcarrier bit streams after the first equalization processing.

Specifically, for a third subcarrier bit stream with relatively large interference, the receiving device performs equalization processing on each path of third subcarrier bit stream to obtain the third subcarrier bit stream after the first equalization processing.

The equalization processing shown in this embodiment means that the receiving device generates a characteristic opposite to that of the channel for each path of the third subcarrier bit stream, and is used for canceling the intersymbol interference caused by the time-varying multipath propagation characteristic of the channel. The transmitted third sub-carrier bit stream signal is distorted by intersymbol interference, so that errors occur in reception. The receiving device is used for counteracting intersymbol interference through the equalization processing so as to reduce the error rate of the third subcarrier bit stream after the first equalization processing.

The present embodiment does not limit the execution timing between step 405 and step 406.

Step 407, the receiving device obtains N2 paths of second subcarrier bit streams after second decoding and N1 paths of third subcarrier bit streams after first decoding.

Specifically, the receiving device shown in this embodiment performs second FEC decoding on N2 paths of the first decoded second subcarrier bit streams and N1 paths of the first equalized third subcarrier bit streams together to obtain the second subcarrier bit streams after the second decoding and the first decoded third subcarrier bit streams.

Please refer to step 206 shown in fig. 2 for the execution process of step 407 shown in this embodiment, which is not described in detail herein.

And step 408, the receiving device obtains N1 paths of third subcarrier bit streams after the second equalization processing.

Specifically, the receiving device performs equalization processing on each path of the first decoded third subcarrier bit stream to obtain a second equalized third subcarrier bit stream. For a detailed description of the equalization process, please refer to step 406 in detail, which is not described in detail.

And step 409, the receiving device acquires N1 paths of second decoded third subcarrier bit streams.

Specifically, the receiving device performs first FEC decoding on each path of second equalized third subcarrier bit stream to obtain N1 paths of second decoded third subcarrier bit streams.

Please refer to step 207 shown in fig. 3 for the process performed in step 409 in this embodiment, which is not described in detail herein.

Step 410, the receiving device obtains N first bit streams.

Please refer to step 208 shown in fig. 2, and the specific execution process of step 410 shown in this embodiment is not described in detail.

By adopting the method shown in this embodiment, the third subcarrier bit stream with relatively large interference is subjected to equalization processing, so that the bit error rate of the third subcarrier bit stream is further reduced, and the error correction capability of decoding the third subcarrier bit stream is improved.

In addition, as the third subcarrier bit stream with relatively large interference is equalized twice as shown in this embodiment, the accuracy of decoding the third subcarrier bit stream is effectively improved.

The following describes the structure of a processing circuit provided in the present application for executing any of the embodiments of fig. 2 or fig. 4. As shown in fig. 5, the processing circuit 500 shown in this embodiment includes a logic circuit 501 and an interface circuit 502 which are connected in sequence.

In the case where the transmitting device includes the processing circuit 500, the steps related to the transmitting device side processing shown in any of fig. 2 and 4 are executed by the logic circuit 501. The interface circuitry 502 is configured to perform the steps associated with transmitting the bitstream as shown in any of the embodiments of fig. 2 and 4.

In the case where the receiving apparatus includes the processing circuit 500, the steps related to the receiving apparatus side processing shown in any of fig. 2 and 4 are executed by the logic circuit 501. The interface circuit 502 is configured to perform the steps associated with receiving a bitstream as shown in any of the embodiments of fig. 2 and 4.

Alternatively, the logic circuit 501 shown in this embodiment may also be referred to as a processor. The interface circuit 502 may also be implemented as a transceiver circuit.

The processing device shown in this embodiment and including the processing circuit 500 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 the structure of the transmitting device from the perspective of the functional blocks, as shown in fig. 6:

the transmitting device 600 shown in this embodiment includes N first FEC encoding modules, N second FEC encoding modules 610, N1 distribution modules, and N transmitting modules.

It should be clear that the number of allocation modules shown in this embodiment is equal to the number of first subcarrier bit streams. The present embodiment takes the value of N1 as 2 for example. Among the N first FEC encoding modules, the first FEC encoding module 1 is sequentially connected to the allocating module 1 and the sending module 1. The first FEC encoding module N is connected to the allocating module 2 and the sending module N in sequence. The first FEC encoding modules 2 to N-1 are respectively connected with the sending modules 2 to N-1.

The N first FEC encoding modules are respectively connected to the second FEC encoding module 610. The second FEC encoding module 610 is connected to the distribution module 1 and the distribution module 2.

In the case where the transmitting device shown in fig. 6 executes the embodiment shown in fig. 2, N first FEC encoding modules are respectively used for executing step 201. Two first FEC coding modules (i.e. the first FEC coding module 1 and the first FEC coding module N) for outputting the first subcarrier bit stream are respectively connected to the two distribution modules to transmit the first subcarrier bit stream to the distribution modules. For a detailed description of the first subcarrier bitstream, please refer to fig. 2, which is not described in detail.

The first FEC encoding module (i.e. the first FEC encoding module 2 and the first FEC encoding module N-1) for outputting the second subcarrier bit stream transmits the second subcarrier bit stream to the transmission module 2 to the transmission module N-1, respectively.

The first FEC encoding module (i.e. the first FEC encoding module 1 and the first FEC encoding module N) is further configured to send the obtained first subcarrier bit stream to the second FEC encoding module 610. The first FEC encoding module (i.e. the first FEC encoding module 2 and the first FEC encoding module N-1) is further configured to send the obtained second subcarrier bit stream to the second FEC encoding module 610.

In a case where the second FEC encoding module 610 receives N second bit streams from the N first FEC encoding modules, the second FEC encoding module 610 is configured to perform steps 202 to 203.

The second FEC encoding module 610 is further configured to divide the second overhead into two sub-overheads, for details of the description of the sub-overheads, please refer to fig. 2, which is not described in detail. The second FEC encoding module 610 is further configured to send the two sub-overheads to the allocating module 1 and the allocating module 2, respectively.

The 2 allocation modules are configured to configure the sub overhead and the first subcarrier bit stream into a third subcarrier bit stream, and for a specific description of the third subcarrier bit stream, please refer to the embodiment shown in fig. 2 in detail, which is not repeated in detail.

When the N sending modules receive the N third bit streams, the N sending modules are configured to execute step 204. For a specific description of the third bitstream, please refer to the embodiment shown in fig. 2 in detail, which is not repeated herein.

In the case where the transmitting device shown in fig. 6 performs the embodiment shown in fig. 4, N first FEC encoding modules are respectively configured to perform step 401. The first FEC encoding module (i.e. the first FEC encoding module 2 and the first FEC encoding module N-1) for outputting the second subcarrier bit stream transmits the second subcarrier bit stream to the transmission module 2 to the transmission module N-1, respectively.

In a case where the second FEC encoding module 610 receives N second bit streams from the N first FEC encoding modules, the second FEC encoding module 610 is configured to perform steps 402 to 403.

The second FEC encoding module 610 is further configured to divide the second overhead into two sub-overheads, and please refer to fig. 2 for details of the description of the sub-overheads, which is not described in detail. The second FEC encoding module 610 is further configured to send the two sub-overheads to the allocating module 1 and the allocating module 2, respectively.

When the N sending modules receive the N third bit streams, the N sending modules are configured to execute step 404. For a specific description of the third bitstream, please refer to the embodiment shown in fig. 2 in detail, which is not described in detail.

The structure of the receiving apparatus 700 for performing the embodiment shown in fig. 2 is described below from the perspective of functional blocks, as shown in fig. 7:

the receiving apparatus 700 shown in this embodiment includes N first FEC decoding modules and a second FEC decoding module 710 connected to the N first FEC decoding modules.

For a specific description of the second subcarrier bit stream, please refer to the embodiment shown in fig. 2 in detail, which is not repeated in detail.

The first FEC decoding module 2 to the first FEC decoding module N-1 are respectively configured to execute step 205. Each first FEC decoding module sends the first decoded second subcarrier bit stream to the second FEC decoding module 710.

The second FEC decoding module 710 is also operable to receive a third subcarrier bitstream. The second FEC decoding module 710 is configured to perform step 206. The second FEC decoding module 710 sends the two output first-decoded third subcarrier bit streams to the first FEC decoding module 1 and the first FEC decoding module N, respectively.

The first FEC decoding module 1 and the first FEC decoding module N are respectively configured to execute step 207. The first FEC decoding module 1 and the first FEC decoding module N are further configured to send the second decoded third subcarrier bit stream to the second FEC decoding module 710.

The second FEC decoding module 710 is configured to perform step 208.

The structure of a receiving apparatus 800 for performing the embodiment shown in fig. 4 is described below from the perspective of functional blocks, as shown in fig. 8:

the receiving apparatus 800 shown in this embodiment includes N first FEC decoding modules, and a second FEC decoding module 710 connected to the first FEC decoding modules 2 to N-1. An equalization module 720 coupled to the second FEC decoding module 710. And the first FEC decoding module 1 and the first decoding module N are further connected to N1 equalizing modules 720, respectively. The present embodiment takes the value of N1 as 2 for example.

The first FEC decoding module 2 to the first FEC decoding module N-1 are respectively configured to perform step 405. Each first FEC decoding module sends the first decoded second subcarrier bit stream to the second FEC decoding module 710.

The equalization module 720 is configured to perform step 406. And each equalization module 720 is further configured to send the third subcarrier bit stream after the first equalization process to the second FEC decoding module 710.

The second FEC decoding module 710 is further configured to receive the third subcarrier bitstream after the first equalization process. The second FEC decoding module 710 is configured to perform step 407. The second FEC decoding module 710 sends the two output first decoded third subcarrier bit streams to the two equalizing modules 720, respectively. The equalization module 720 is used to perform step 408. The two equalization modules 720 are further configured to send two paths of second equalized third subcarrier bit streams to the first FEC decoding module 1 and the first FEC decoding module N, respectively.

The first FEC decoding module 1 and the first FEC decoding module N are respectively configured to execute step 409. The first FEC decoding module 1 and the first FEC decoding module N are further configured to send the second decoded third subcarrier bit stream to the second FEC decoding module 710.

The second FEC decoding module 710 is configured to perform step 410.

The following describes a specific structure of the network device provided in the present application with reference to fig. 9. As shown in fig. 9, the network device 900 includes a processor 901, a memory 902, and a transceiver 903. The processor 901, memory 902 and transceiver 903 are interconnected by wires. Memory 902 is used to store, among other things, program instructions and data.

In the case where the network device shown in this embodiment is used as a transmitting device, the memory 902 shown in this embodiment stores information supporting the steps shown in fig. 2 and 4, and the processor 901 executes the steps related to the processing shown in any one of fig. 2 and 4. The transceiver 903 is configured to perform the steps related to transmitting the bit stream in any of the embodiments of fig. 2 and 4.

For example, in fig. 2, processor 901 is configured to execute steps 201 to 203. The transceiver 903 is used to perform step 204.

As another example, in fig. 4, processor 901 is configured to execute steps 401 to 403. The transceiver 903 is used to perform step 404.

In the case where the network device shown in this embodiment is used as a receiving device, the memory 902 shown in this embodiment stores the steps shown in fig. 2 and 4, and the processor 901 executes the steps related to the processing shown in any one of fig. 2 and 4. The transceiver 903 is used for executing the steps related to receiving the bit stream in any of the embodiments of fig. 2 and 4.

For example, in fig. 2, processor 901 is configured to execute step 205 to step 208. As another example, in fig. 4, processor 901 is configured to execute steps 405 to 410.

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 encoding, the method comprising:

performing first Forward Error Correction (FEC) coding on N paths of first bit streams to obtain a first overhead, wherein the N paths of first bit streams comprise N1 paths of first subcarrier bit streams and N2 paths of second subcarrier bit streams, N1 is an integer which is greater than or equal to 1, N2 is a natural number, and N1+ N2 is equal to N;

distributing the first overhead to the N1 paths of first subcarrier bit streams to obtain N1 paths of third subcarrier bit streams;

and transmitting N paths of second bit streams, wherein the N paths of second bit streams comprise the N1 paths of third subcarrier bit streams and the N2 paths of second subcarrier bit streams.

2. The encoding method according to claim 1, wherein before the first FEC encoding is performed on the N first bit streams to obtain the first overhead, the method further comprises:

and respectively carrying out second FEC encoding on each path of the third bit stream in the N paths of third bit streams to obtain the N paths of first bit streams, wherein the first bit streams comprise second overheads.

3. The encoding method according to claim 1 or 2, wherein the carrier frequency of the first sub-carrier bit stream is smaller than the carrier frequency of the second sub-carrier bit stream, or wherein the carrier frequency of the first sub-carrier bit stream is larger than the carrier frequency of the second sub-carrier bit stream.

4. The encoding method according to any of claims 1 to 3, wherein said allocating the first overhead to the N1 first subcarrier bit streams to obtain N1 third subcarrier bit streams comprises:

dividing the first overhead into N1 sub-overheads;

and allocating the N1 sub-overheads to the N1 channels of first subcarrier bit streams respectively to obtain the N1 channels of third subcarrier bit streams, where each channel of third subcarrier bit streams in the N1 channels of third subcarrier bit streams includes one sub-overhead.

5. The encoding method according to any one of claims 1 to 4, wherein each of the third bit streams includes a second overhead generated by performing the second FEC encoding on each of the first two bit streams, and wherein the third subcarrier bit stream includes more bits of the second overhead than the second subcarrier bit stream.

6. The encoding method according to any one of claims 1 to 5, wherein the performing the first FEC encoding on the N paths of the first bit streams to obtain the first overhead comprises:

merging the N paths of first bit streams to obtain merged bit streams;

performing the first FEC encoding on the merged bit stream to obtain the first overhead.

7. The encoding method according to any one of claims 1 to 5, wherein the performing the first FEC encoding on the N paths of the first bit streams to obtain the first overhead comprises:

performing interleaving coding on the N paths of first bit streams to obtain interleaved coded bit streams;

performing the first FEC encoding on the interleaved encoded bit stream to obtain the first overhead.

8. A method of decoding, the method comprising:

receiving N paths of second bit streams, wherein the N paths of second bit streams comprise N1 paths of third subcarrier bit streams and N2 paths of second subcarrier bit streams, N1 is an integer which is greater than or equal to 1, N2 is a natural number, and N1+ N2 is equal to N; the N1 th subcarrier bit streams include a first overhead;

performing first FEC decoding on the N2 channels of second subcarrier bit streams and the N1 channels of third subcarrier bit streams to obtain N2 channels of second subcarrier bit streams after the first FEC decoding and N1 channels of third subcarrier bit streams after the first FEC decoding;

performing second FEC decoding on each path of the first FEC-decoded third subcarrier bit stream to obtain a second FEC-decoded third subcarrier bit stream;

and performing the first FEC decoding on the N2 paths of first FEC decoded second subcarrier bit streams and the N1 paths of second FEC decoded third subcarrier bit streams to obtain N paths of first bit streams.

9. The decoding method according to claim 8, wherein before performing the first FEC decoding on the N2 lanes of the second subcarrier bit stream and the N1 lanes of the third subcarrier bit stream, the method further comprises:

and performing second FEC decoding on each path of second subcarrier bit stream to obtain second subcarrier bit stream after second FEC decoding.

10. The decoding method according to claim 9, wherein the carrier frequency of the first sub-carrier bit stream is smaller than the carrier frequency of the second sub-carrier bit stream, or wherein the carrier frequency of the first sub-carrier bit stream is larger than the carrier frequency of the second sub-carrier bit stream.

11. The decoding method according to any of claims 8 to 10, wherein each of said third subcarrier bit streams comprises a sub-overhead, and wherein N1 of said sub-overheads comprised by said N1 third subcarrier bit streams form said first overhead.

12. The decoding method according to any of claims 8 to 11, wherein each of the second bit streams comprises a second overhead, and the third subcarrier bit stream comprises a greater number of bits than the second overhead comprised by the second subcarrier bit stream.

13. The decoding method according to any one of claims 8 to 12, wherein the method further comprises:

equalizing each path of the third subcarrier bit stream to obtain a first equalized third subcarrier bit stream;

the second FEC decoding N2 the second subcarrier bit stream and N1 the third subcarrier bit stream comprises:

and carrying out second FEC decoding on the N2 paths of second subcarrier bit streams and the N1 paths of third subcarrier bit streams after the first equalization processing.

14. The decoding method according to any one of claims 8 to 13, wherein the method further comprises:

equalizing each path of the third subcarrier bit stream after the first FEC decoding to obtain a second equalized third subcarrier bit stream;

performing second FEC decoding on each path of the first FEC-decoded third subcarrier bit stream, including:

and performing the second FEC decoding on each of the second equalized third subcarrier bit streams.

15. A network device, comprising: a processor, a memory and a transceiver 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 a method relating to a process as claimed in any one of claims 1 to 14, the transceiver being configured to perform a method relating to a transceiver as claimed in any one of claims 1 to 14.

16. A communication system comprising a transmitting device for performing the encoding method of any one of claims 1 to 7 and a receiving device for performing the decoding method of any one of claims 8 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.