Efficient LLR Calculation for Non-Binary Modulations over Fading Channels

被引：31

作者：

Yazdani, Raman ^{[1
]}

Ardakani, Masoud ^{[1
]}

机构：

[1] Univ Alberta, Dept Elect & Comp Engn, Edmonton, AB T6G 2V4, Canada

来源：

IEEE TRANSACTIONS ON COMMUNICATIONS | 2011年 / 59卷 / 05期

基金：

加拿大自然科学与工程研究理事会;

关键词：

Log-likelihood ratio (LLR); bit-interleaved coded modulation (BICM); low-density parity-check (LDPC) codes; piecewise linear approximations; fading channels; PARITY-CHECK CODES; DESIGN; SCHEMES;

D O I：

10.1109/TCOMM.2011.022811.090261

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：

Log-likelihood ratio (LLR) computation for nonbinary modulations over fading channels is complicated. A measure of LLR accuracy on asymmetric binary channels is introduced to facilitate good LLR approximations for non-binary modulations. Considering piecewise linear LLR approximations, we prove convexity of optimizing the coefficients according to this measure. For the optimized approximate LLRs, we report negligible performance loss compared to true LLRs.

引用

页码：1236 / 1241

页数：6

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