SNR mismatch and online estimation in turbo decoding

被引：223

作者：

Summers, TA ^{[1
]}

Wilson, SG ^{[1
]}

机构：

[1] Univ Virginia, Dept Elect Engn, Charlottesville, VA 22903 USA

来源：

IEEE TRANSACTIONS ON COMMUNICATIONS | 1998年 / 46卷 / 04期

基金：

美国国家科学基金会; 美国国家航空航天局;

关键词：

iterative decoding; SNR estimation; turbo decoding;

D O I：

10.1109/26.664291

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Iterative decoding of turbo codes, as well as other concatenated coding schemes of similar nature, requires knowledge of the signal-to-noise ratio (SNR) of the channel so that proper blending of the a posteriori information of the separate decoders is achieved. In this paper we study the sensitivity of decoder performance to misestimation of the SNR, and propose a simple online scheme that estimates the unknown SNR from each code block, prior to decoding, We show that this scheme is sufficiently adequate in accuracy to not appreciably degrade performance.

引用

页码：421 / 423

页数：3

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