Distribution of L-Values in Gray-Mapped M2-QAM: Closed-Form Approximations and Applications

被引：46

作者：

Alvarado, Alex ^{[1
]}

Szczecinski, Leszek ^{[2
]}

Feick, Rodolfc ^{[4
]}

Ahumada, Luciano ^{[3
]}

机构：

[1] Chalmers Univ Technol, Dept Signals & Syst, Commun Syst Grp, S-41296 Gothenburg, Sweden

[2] INRS EMT, Inst Natl Rech Sci, Montreal, PQ H5A 1K6, Canada

[3] Univ Diego Portales, Escuela Ingn Informat, Santiago, Chile

[4] Univ Tecn Federico Santa Maria, Dept Elect Engn, Valparaiso, Chile

来源：

IEEE TRANSACTIONS ON COMMUNICATIONS | 2009年 / 57卷 / 07期

基金：

瑞典研究理事会; 加拿大自然科学与工程研究理事会;

关键词：

BER; BICM; convolutional codes; constellation rearrangement; gray mapping; HARQ; logarithmic likelihood ratios; L-values; PDF; QAM; union bound; ERROR-PROBABILITY; MAPPING DIVERSITY; CODED MODULATION; BIT; DESIGN; PERFORMANCE; SYSTEMS; BICM;

D O I：

10.1109/TCOMM.2009.07.070506

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：

In this paper we develop closed form approximations for the probability density function (PDF) of the reliability metrics (L-values) in bit-interleaved coded modulation (BICM). The expressions are valid for M-2-ary quadrature amplitude modulations (M-2-QAM) with binary reflected Gray mapping when the metrics are calculated using the so-called max-log approximation. Based on the developed expressions, we also propose two simple Gaussian mixture approximations that are analytically tractable. We apply our developments to efficiently calculate the BICM capacity, and to develop bounds on the coded bit-error rate when a convolutional code is used. The coded performance of a hybrid automatic repeat request (HARQ) based on constellation rearrangement is also evaluated.

引用

页码：2071 / 2079

页数：9

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