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Signal encoding modulation and demodulation decoding methods based on probability forming

A technology of signal encoding and modulation method, which is applied in the direction of modulated carrier system, forward error control, transmission system, etc., and can solve the problem of low signal transmission power

Active Publication Date: 2019-03-29
BEIJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the embodiments of the present invention is to provide a signal coding modulation, demodulation and decoding method and optical communication system based on probability shaping, so as to solve the problem in the prior art that the probability of occurrence of constellation points with large energy and constellation points with low energy is the same , leading to the problem of low signal transmission power

Method used

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  • Signal encoding modulation and demodulation decoding methods based on probability forming
  • Signal encoding modulation and demodulation decoding methods based on probability forming
  • Signal encoding modulation and demodulation decoding methods based on probability forming

Examples

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example 1

[0192] Example 1, the encoding symbol obtained after the first convolutional encoding by the first convolutional encoder is 11, due to the preset 9 encoding symbols: 00, 010, 011, 100, 101, 1100, 1101, 1110, 1111 Without 11, 11 is filtered out by the first interleaver.

example 2

[0193] Example 2, the encoding symbol obtained after the first convolutional encoding by the first convolutional encoder is 00, and the first interleaver, according to the preset 9 encoding symbols, determines that the first quasi-encoding symbol is 2 bits, that is, 00 .

[0194] Example 3, the coding symbol obtained after the first convolutional coding by the first convolutional encoder is 10, and the first interleaver, according to the preset 9 coding symbols, determines that the first quasi-coding symbol is 3 bits, that is, 10x , at this time, only the first 2 bits in 10x have been determined, and the lowest bit has not been determined.

[0195] Send the 2nd and 3rd bits of the first parallel data to the second convolutional encoder, the second convolutional encoder performs the second convolutional encoding, and the second interleaver, according to the 9 encoding symbols, encodes After the data is filtered, a 4-bit second quasi-coded symbol is obtained.

[0196] Example ...

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Abstract

The embodiment of the invention provides a signal encoding modulation method based on probability forming, which can implement a case of encoding an original signal to generate encoded symbols with different symbol lengths so as to achieve a small occurrence probability of constellation points with high energy and a big occurrence probability of constellation points with low energy and effectivelyimprove transmission power of a signal in a system. In addition, the embodiment of the invention also provides a signal demodulation decoding method based on probability forming, which can implementa case of carrying out grouping on encoded symbols according to symbol lengths of the encoded symbols and respectively carrying out decoding for each group, so that each group of encoded symbols can obtain a good decoding result and accuracy of the decoding results in the system is improved.

Description

technical field [0001] The invention relates to the technical field of trellis coding modulation, in particular to a signal coding modulation, demodulation and decoding method and an optical communication system based on probability shaping. Background technique [0002] At present, for an optical communication system, a trellis coding method is used at the transmitting end to code and modulate the original signal, specifically, a trellis coding modulation method based on 8 Phase Shift Keying 8PSK (8Phase Shift Keying). In this encoding and modulation method, the original signal to be sent is encoded and modulated to generate an 8PSK signal with 8 symbols with the same symbol length, that is, an 8PSK signal corresponding to 8 constellation points, and the signal generated by encoding and modulating is usually mapped into a two-dimensional In the constellation diagram, symbols in a signal generated by coding and modulation are referred to as constellation points in the conste...

Claims

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Application Information

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IPC IPC(8): H04L27/34H04L27/36H04L27/38H04L1/00H04B10/61H04B10/556H04B10/54
CPCH04B10/541H04B10/5561H04B10/61H04L1/0059H04L1/0071H04L27/3483H04L27/36H04L27/3818
Inventor 忻向军张琦张丽佳田清华岳竹青田凤王拥军杨雷静吕凯盛夏王曦朔潘晓龙
Owner BEIJING UNIV OF POSTS & TELECOMM