Bitwise Log-Likelihood Ratios for Quadrature Amplitude Modulations

被引：6
|
作者：
Park, Sung-Joon [1 ]
机构：
[1] Gangneung Wonju Natl Univ, Dept Elect Engn, Kangnung 210702, South Korea
来源：
IEEE COMMUNICATIONS LETTERS | 2015年 / 19卷 / 06期
关键词：
Quadrature amplitude modulation; soft output demodulation; bitwise log-likelihood ratio; BIT METRIC GENERATION; LOW-COMPLEXITY BIT; SIGNALS;
D O I：
10.1109/LCOMM.2015.2424423
中图分类号：
TN [电子技术、通信技术];
学科分类号：
0809 ;
摘要：
For an increase in spectral efficiency and improvement of error performance, a high-order modulation and an advanced channel coding scheme are jointly used for many digital communication systems. In this paper, a new and simple method for calculating bitwise log-likelihood ratios which are required for soft decision decoding is proposed for M-ary quadrature amplitude modulations. The mean square error of the proposed scheme is fairly improved when compared with the well-known Min approximation. In addition, the decoding error probability that is evaluated using a turbo code is in agreement with the performance obtained by the exact bitwise log-likelihood ratios that accompany high computational complexity.
引用
收藏
页码：921 / 924
页数：4
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