Labeling Non-Square QAM Constellations for One-Dimensional Bit-Metric Decoding

Author

Bocherer, Georg

Author_Institution

Inst. for Commun. Eng., Tech. Univ. Munchen, Munich, Germany

Volume

18

Issue

9

fYear

2014

fDate

Sept. 2014

Firstpage

1515

Lastpage

1518

Abstract

A new modulation scheme is proposed that combines the advantages of APSK and QAM constellations, namely, the low peak power of APSK and the independent processing of the real and imaginary components of QAM. The new scheme consists of a Gray-labeled non-square QAM constellation and a bit-metric decoder. At a spectral efficiency of 3.5 bits/s/Hz, the new scheme saves 1.35 dB of peak power compared with conventional QAM. The new scheme is implemented with a binary low-density parity-check code. Simulation results are presented.

Keywords

Gray codes; amplitude shift keying; binary codes; decoding; modulation coding; parity check codes; phase shift keying; quadrature amplitude modulation; APSK; QAM imaginary components; binary low-density parity-check code; labeling nonsquare QAM constellations; one-dimensional bit-metric decoding; peak power; spectral efficiency; Decoding; Digital video broadcasting; Labeling; PSNR; Quadrature amplitude modulation; Quantization (signal); Quadrature amplitude modulation; amplitude phase shift keying; binary labeling; bit-interleaved coded modulation;

fLanguage

English

Journal_Title

Communications Letters, IEEE

Publisher

ieee

ISSN

1089-7798

Type

jour

DOI

10.1109/LCOMM.2014.2337318

Filename

6857385