Method, device and system for encoding and decoding

Abstract

The invention discloses a method, a device and a system for encoding and decoding. The method for encoding comprises the following steps of: firstly, partitioning code words in a data flow; secondly, processing the code words in turn, which comprises reversing the code words and inserting indicants; and finally, grouping the code words after processing the code words, determining code word groups, and performing synchronous head processing on the front of the code word groups. The method for decoding comprises the following steps of: firstly, picking up the synchronous heads from the data flow; secondly, picking up the indicants and determining the code words from the remaining data flow; and finally, processing the code words in turn. The method for encoding and decoding is capable of effectively controlling the emergence of successive '1' bytes and successive '0' bytes in the data flow, and has the advantages of low cost of coding and high read-write speed.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a codec method, device and system. technical background [0002] In the optical transmission system, if the digital signal generated by the source is naturally coded and then directly modulated onto the optical carrier for transmission, some problems will often arise, such as: there may be data with "0" or "1" This will result in a long-term constant low level or high level; and for the receiving end, it is impossible to judge whether there is an error code from the received baseband signal. [0003] Therefore, it is hoped that the transmitted signal should preferably be a DC balanced signal, that is, the "1" and "0" distribution of the data stream is balanced, and the continuous identical bit number (CID) of the transmitted data stream should be as small as possible, or the data stream The run length value RD (run length) of the minimum. [0004] Currently commo...

AI Technical Summary

Problems solved by technology

[0004]Currently commonly used line coding includes: scrambling code, 8B10B coding, 64B66B coding and 9B10B coding, etc. The scrambling code does not need to add extra symbols but disturbs the signal, changing The statistical characteristics of digital signals are the main characteristics, but the appearance of long series "1" and long series "0" data cannot be completely controlled, and the component close to DC in the signal spectrum is relatively large

8B10B, as a representative code of block coding, maps an 8-bit code word to another 10-bit long code word through the code table. Although it can obtain good DC balance and run length control characteristics, its up to 25% Coding overhead creates a large burden on the transmission system, especially in high-speed communication systems

64B66B encoding, as a line encoding applied to 10G Ethernet, inserts synchronization bits and scrambling codes, which is helpful for clock extraction and has a certain run length control capability (the maximum run length is 65bit), but it cannot take into account the DC balance characteristics

As a block code, due to the error of 1 or several bits in the 10-bit code word caused by the transmission error, the 10-bit code word will be mapped to another wrong 9-bit code word or none when decoding. Corresponding decoding, resulting in the error proliferation problem

Images