Extrinsic information correction method of iteration demodulation system

A correction method and external information technology, applied in the field of digital information, can solve problems such as overestimation and iterative demodulation system reliability errors, and achieve the effects of improving bit error performance, alleviating adverse effects, and improving performance

Inactive Publication Date: 2014-05-14
TSINGHUA UNIV +1
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The invention provides an external information correction method of an iterative demodulation system, which solves the problem of error and overestimation of reliability in the iterative demodulation system, and improves the bit error performance of the iterative demodulation system

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Extrinsic information correction method of iteration demodulation system
  • Extrinsic information correction method of iteration demodulation system
  • Extrinsic information correction method of iteration demodulation system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0032] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0033] The invention provides an extrinsic information correction method for improving the bit error performance of an iterative demodulation system, which is suitable for a system of iterative symbol demodulation and channel decoding, such as figure 1 As shown, the method steps are as follows:

[0034] S1. Maintain the log-likelihood ratio of the external information before the output of the symbol demodulator, the log-likelihood ratio of the external information output by the symbol demodulator, the log-likelihood ratio of the external information before the output of the channel decoder and the output of the channel decoder The sign bit of at least one of the external information log likelihood ratios in the external information log likelihood ratio is unchanged, the absolute value of the external info...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses an extrinsic information correction method of an iteration demodulation system, and the correction method is adaptive to a system of an iteration sign demodulator and a channel decoder. The correction method comprises that: a sign bit of at least one extrinsic information log-likelihood ratio in the extrinsic information log-likelihood ratio before output of the sign demodulator, the extrinsic information log-likelihood ratio outputted by the sign demodulator, the extrinsic information log-likelihood ratio before output of the channel decoder and the extrinsic information log-likelihood ratio outputted by the channel decoder is maintained to be unchanged, and an absolute value of the extrinsic information log-likelihood ratio is reduced so that the corrected log-likelihood ratio is obtained; and the corrected log-likelihood ratio is transmitted to the channel decoder or fed back to the sign demodulator to act as prior information. Problems of errors and overestimation of reliability in the iteration demodulation system are solved so that error code performance of the iteration demodulation system is enhanced.

Description

technical field [0001] The invention relates to the technical field of digital information, in particular to an extrinsic information correction method of an iterative demodulation system. Background technique [0002] Iterative demodulation technology is a kind of coded modulation technology, which performs iterative channel decoding and demodulation at the receiving end, so as to obtain more superior bit error performance. A typical iterative demodulation system is bit-interleaved coded modulation (BICM-ID) for iterative demodulation. The BICM-ID sender is the same as the traditional bit-interleaved coded modulation, with a simple structure, consisting of a channel encoder, a bit interleaver, and a symbol modulation device composition. The channel encoder is used to add redundancy to the input information bit stream to obtain the encoded bit stream. The coded bit stream is scattered and rearranged by the bit interleaver and then input to the symbol modulator, which maps ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H03M3/00
Inventor 谢求亮王昭诚钱辰杨知行
Owner TSINGHUA UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap