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Joint encoding modulation method based on no-rate codes and V-OFDM

A technology of V-OFDM and rateless coding, which is applied in the field of wireless communication and can solve problems such as the inability to obtain joint coding modulation gain

Active Publication Date: 2015-04-29
ZHEJIANG UNIV
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  • Abstract
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Problems solved by technology

[0008] The purpose of the present invention is to overcome the shortcomings of simple cascading of coding and modulation in the prior art and unable to obtain joint coding and modulation gain, and provide a coding and modulation method based on the joint design of rateless coding and Vector OFDM

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  • Joint encoding modulation method based on no-rate codes and V-OFDM
  • Joint encoding modulation method based on no-rate codes and V-OFDM
  • Joint encoding modulation method based on no-rate codes and V-OFDM

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Embodiment Construction

[0043] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0044] The present invention is a coding and modulation method based on the joint design of rateless code and Vector OFDM, the implementation block diagram is shown in the attached figure 1 , the specific implementation steps are as follows:

[0045] (1) For the original message bit stream {a 0 ,a 1 ...,a 400} to perform rateless coding to obtain the coded bit stream to be modulated {b 0 ,b 1 ...,b 500 ,...,b 1000}, the internal operation of the encoder is as follows: 400-bit information is taken, LDPC code selects the system code, and 425 variable nodes are output, including 25 checkpoints and 400 original information bits; The Tanner graph degree distribution information D of the rateless code, see the appendix of the manual figure 2 ; Divide the coded bits into 7 groups, each group size N=24×6, the last group symbol differ...

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Abstract

The invention discloses a joint encoding modulation method based on no-rate codes and V-OFDM. A sending terminal conducts modulation based on the no-rate codes and the V-OFDM. The joint encoding modulation method is basically characterized by comprising the steps that 1, a message bit stream which is encoded through no-rate codes is mapped into a time-frequency domain message matrix of Vector OFDM, and the area degrees of a data block are even; 2, message bits encoded through the no-rate codes are modulated to subcarriers, the message bits of different freedom degrees are mapped onto the same subcarrier, and the message bits of the same freedom degree are mapped onto different subcarriers. According to the joint encoding modulation method, through joint encoding modulation, frequency selective fading and time selective fading of a doubly selective channel can be more effectively resisted, intersymbol interference and carrier interference are overcome, doubly selective fading is effectively resisted, bigger joint multipath-Doppler diversity gain of the doubly selective channel is obtained, the error rate is lowered, and the communication quality is improved.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a joint coding and modulation method based on rateless codes and Vector OFDM. 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 interferenc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/00H04L1/00
CPCH04L5/0007H04L25/03006H04L25/06H04L27/0014H04L27/2601
Inventor 张朝阳付攀玉屠坤杨潇翔张昱张华滋王献斌张亮
Owner ZHEJIANG UNIV
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