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A Diversity-Based Joint-degree Dynamic Decoding Method for Rateless Codes

A rateless code and degree technology, applied in the direction of transmission modification based on link quality, adjustment of transmission rate, device dedicated to the receiver, etc., to achieve the effect of low complexity

Active Publication Date: 2018-03-06
ZHEJIANG UNIV
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Problems solved by technology

[0007] The purpose of the present invention is to overcome the defects of simple torrent iteration (parallel iteration) or serial iteration of existing rateless code iterative decoding technology, and to provide a dynamic decoding method based on diversity of rateless code joint degree

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  • A Diversity-Based Joint-degree Dynamic Decoding Method for Rateless Codes

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Embodiment Construction

[0051] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0052] A kind of diversity-based joint degree dynamic decoding method of the rateless code of the present invention, concrete implementation steps are as follows:

[0053] (1) For the original message bit stream {b 0 ,b 1 ...,b 400 ,…} to perform rateless encoding to obtain the encoded transmission code bit stream to be modulated {m 0 ,m 1 ..., m 720}, and obtain the Tanner graph degree distribution information D of the encoder’s rateless code, such as figure 2 shown;

[0054] (2) For the 64-QAM dimensional modulation signal space, the independent diversity of the I channel and the Q channel is adopted, which is equivalent to two channels of 8-APK and two channels increasing the Euclidean distance d of adjacent constellation points in the signal space layer by layer 0 1 2 , with the symbol S 0 , S 1 , S 2 Represents the sig...

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Abstract

The invention discloses a rateless code joint degree dynamic decoding method based on a diversity. The method concretely comprises the steps that: a transmitting terminal increases an adjacent constellation Euclidean distance of a signal space layer by layer based on a signal space diversity; the joint degree decoding method modulates coded bit streams; a signal space sub-layer having a large Euclidean distance modulates coded bits having large degrees; a receiving terminal preferentially iterates the signal space sub-layer having the large Euclidean distance by using a series layering dynamic decoding plan; a check node having a large decoding degree in the sub-layer is preferentially iterated according to a principle of preferentially iterating the space sub-layers having large Euclidean distances and large decoding degrees. According to the invention, the transmitting terminal adopts the signal space diversity and joint decoding modulation, and the receiving terminal adopts the joint degree dynamic decoding plan, so that the method can improve decoding performances of the rateless codes with a low complexity, decrease bit error rates and improve communication quality without sacrificing system bandwidth.

Description

technical field [0001] The invention relates to the field of wireless communication channel coding, in particular to a diversity-based joint degree dynamic decoding method for rateless codes. Background technique [0002] Wireless communication uses electromagnetic waves to carry signals and spread information in free space. It can get rid of the constraints of terrain and the constraints of transmission cables, and has excellent mobility. At the same time, how to control the error of the transmitted data information, resist noise interference and realize accurate data reproduction has become an important issue in wireless communication. The channel coding technology with error correction ability is the key to solve this problem. In the process of channel coding, the main application of coding is to provide protection for the transmitted data information. By adding a certain number of controlled redundant bits to the data information, it can effectively resist the noise and...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00
CPCH04L1/0002H04L1/0013H04L1/0038H04L1/005
Inventor 张朝阳付攀玉杨潇翔张婧彭朱伟张昱
Owner ZHEJIANG UNIV
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