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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
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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

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  • Extrinsic information correction method of iteration demodulation system
  • Extrinsic information correction method of iteration demodulation system
  • Extrinsic information correction method of iteration demodulation system

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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...

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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

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Application Information

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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
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