Exact and approximate log-likelihood ratio of M-ary QAM with two-time dimensions

被引：1

作者：

Lee, Ji-hoon ^{[1
]}

Chung, Hae ^{[1
]}

机构：

[1] Kumoh Natl Inst Technol, Dept Elect Engn, Gumi, South Korea

来源：

ICT EXPRESS | 2019年 / 5卷 / 03期

关键词：

LDPC code; LLR; OFDM; PAPR; QAM; AVERAGE POWER RATIO; PAPR REDUCTION; LOW-COMPLEXITY; OFDM; PTS;

D O I：

10.1016/j.icte.2018.08.004

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

A (3 x 2(m))-ary QAM scheme maps a binary symbol into two-consecutive signal points (signal vector). It provides very lower PAPR than the conventional QAM because it removes corner signal points. For the scheme, this paper discusses an exact analysis of log-likelihood ratio calculation of the signal vector and signal point, and an approximated method to reduce hardware complexity for the channel coding. Numerical results show that the approximated method provides lower hardware complexity and small performance gap compared to exact one. Also, the PAPR and error performances of (3 x 2(m))-ary QAM are compared with the one of conventional QAM. (C) 2018 The Korean Institute of Communications and Information Sciences (KICS). Publishing Services by Elsevier B.V.

引用

页码：173 / 177

页数：5

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