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Decoding method for LT (language translation) codes

A technology for decoding and encoding frames, applied in the fields of data transmission and channel decoding, it can solve the problems of high error rate of channel transmission, insufficient utilization of frame information, and inability to correct error frames, so as to improve error correction ability, high reliability, The effect of low error rate

Inactive Publication Date: 2013-05-08
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the conventional LT code decoding method has defects such as insufficient utilization of received frame information, inability to correct error frames, high error rate of channel transmission, and low transmission efficiency.

Method used

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  • Decoding method for LT (language translation) codes
  • Decoding method for LT (language translation) codes
  • Decoding method for LT (language translation) codes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] The transmitter sends out the signal in the following general way:

[0023] Step A. Framing: Send the original data with a length of 20,000 bits sent by the signal source input to the framing processing module for framing to form 200 original frames S each with a length of 100 i , i=1, 2, ..., 200, turn to step B after framing processing;

[0024] Step B. Conventional LT encoding processing: The original frame sent in step A is subjected to conventional LT encoding processing, that is, firstly, a degree distribution is generated according to the conventional LT code construction method, and an original frame index sequence with a length of 200 is obtained according to the degree distribution , perform frame XOR processing on the original frame according to this sequence, and obtain a coded frame R j , the encoding process can be expressed by the following formula,

[0025] R j = Σ i ...

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Abstract

The invention belongs to a decoding method for LT (language translation) codes in the technical field of communication transmission, which comprises the steps of signal receiving and conventional processing, frame detecting and processing, decoding processing and receiving coding frames, decoding all original frames and processing decoding results. As a system transmitter is not needed to be altered, the decoding method for LT (language translation) codes sufficiently uses the received error frames under the situation of only improving the decoding method of a receiver, finds out error positions through a bit reverse method, and corrects the error positions to obtain right frames instead of throwing the error frames; in this way, the error correction capacity is effectively improved. Therefore, compared with a traditional decoding method for LT codes, the decoding method for LT (language translation) codes has the characteristics of strong correction capacity on error frames during channel transmission, low channel transmission error rate and high system transmission reliability, and effectively improves the system transmission volume, efficiency and communication quality, etc.

Description

technical field [0001] The invention belongs to the data (information) transmission technology in the field of communication, in particular to a channel decoding method using LT codes to reduce the error rate of channel transmission. Background technique [0002] In data communication, signals often generate errors due to noise, fading or other reasons. In order to ensure communication quality and efficiency, these errors must be controlled and corrected. The common error control technology mainly includes forward error correction (FEC ) and feedback retransmission (ARQ) and other technologies. Forward error correction is a very effective method. Common forward error correction codes, namely channel coding, include Reed-Solomon codes, convolutional codes, turbo codes, and low-density parity-check codes ( LDPC) etc. Forward error correction codes, especially turbo codes and LDPC codes that have been rapidly developed recently, are characterized by one-way transmission witho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00H04L1/16
Inventor 林灯生张芹肖鸣李少谦
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA