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Coding and decoding method of length-variable symbol level joint information source channel and multi-dimensional modulation

A multi-dimensional modulation and symbol-level technology, applied in the field of communication, can solve problems such as limited performance and inapplicability of joint coding and modulation systems, and achieve the effect of improving the overall transmission performance

Inactive Publication Date: 2015-07-15
UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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Problems solved by technology

[0006] In order to solve the two problems of the limited performance of the joint source channel coding system and the unsuitability of the existing joint coding and modulation system for variable-length coding transmission systems such as image and video compression, the present invention proposes a variable-length symbol-level joint source The encoding and decoding method of channel and multi-dimensional modulation, which is based on LD-MPSK modulation technology, uses the redundant information of symbol source to design symbol-level LD-MPSK multi-dimensional modulation rules, which can improve the system performance without adding additional channel redundancy. overall transmission performance

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  • Coding and decoding method of length-variable symbol level joint information source channel and multi-dimensional modulation
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  • Coding and decoding method of length-variable symbol level joint information source channel and multi-dimensional modulation

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Embodiment Construction

[0018] 1. Symbol-level run-length coding

[0019] Run-length encoding needs to give the numerical value and number of consecutive strings with the same value in order. According to statistics, in the code stream generated by most of the source compression coding standards (JPEG, H.264 and MPEG-4, etc.) The number of 1" is generally limited. Therefore, for different source coding methods, the number of "0" in the consecutive "0" string and the number of "1" in the consecutive "1" string are mapped to a string length N whose value is less than the pre-statistical length L ( N≤L), the string length N represents the run length of consecutive and staggered "0" strings or consecutive "1" strings. Finally, the run-length data string after run-length coding is obtained, that is, the run-length symbol sequence. The symbol sequence is a continuous and interleaved run-length data string of consecutive "0" series or consecutive "1" series, and the number of symbols is preset. The run l...

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Abstract

The invention relates to a coding and decoding method of a joint information source channel and multi-dimensional modulation and belongs to the communication field. The coding and decoding method of the length-variable symbol level joint information source channel and the multi-dimensional modulation is provided to solve the problems that performance of an existing coding and decoding method of the joint information source channel is limited and an existing joint coded modulation system is not suitable for length-variable coding transmission systems of image compression, video compression and the like. The method is based on the leak detector- M-ary phase shift keying (LD-MPSK) modulation technique. A symbol level LD-MPSK multi-dimensional modulation regulation is designed by using redundant information of a symbol information source. The symbol level LD-MPSK multi-dimensional modulation is enabled to play a role in channel coding and modulating. The redundant information of an information source symbol is fully used in the modulating stage. Minimum Hamming distance of the information source symbol is enlarged and minimum Euclidean distance of a constellation point corresponding to the information source symbol is enlarged. Integral transmission performance of the system can be improved under the condition that no extra information channel redundancy is increased. The coding and decoding method of the length-variable symbol level joint information source channel and the multi-dimensional modulation is suitable for being applied to the length-variable coding transmission systems of the image compression, the video compression and the like.

Description

technical field [0001] The invention relates to a joint coding and decoding method in the field of communication, in particular to a joint information source channel and multi-dimensional modulation coding and decoding method suitable for variable-length symbols. Background technique [0002] In the existing wireless communication system, source coding, channel coding and modulation are usually three independent links, which are optimized and designed respectively. Among them, the purpose of source coding is to compress data and improve the efficiency of data transmission. Usually, the Variable Length Coding (VLC) method with higher compression efficiency is used, but VLC is very sensitive to channel errors, and less Bit errors can cause the sequence of codewords to become out of sync, resulting in error propagation. The purpose of channel coding is to add some redundant information to the coded sequence of the source, thereby improving the ability of data anti-interference...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00
Inventor 凃国防程晨张灿
Owner UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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