Optimisation of 16APSK constellation with a new iterative decoder on the nonlinear channel

Author

Ngo, Nghia H. ; Pietrobon, Steven S. ; Barbulescu, S. Adrian ; Burnet, Craig

Author_Institution

Inst. for Telecommun. Res., South Australia Univ., The Levels, SA

fYear

2006

fDate

1-3 Feb. 2006

Firstpage

71

Lastpage

75

Abstract

Amplitude phase shift keying (APSK) modulation presents an attractive scheme to overcome nonlinearity effects on nonlinear channels compared to conventional square quadrature amplitude modulation (QAM). In this paper, we investigate the performance of a bit interleaved coded modulation with iterative decoding (BICM-ID) system in which APSK modulation is used to achieve a spectral efficiency of 3 bit/s/Hz. A new iterative receiver is proposed where an extra soft-demapper is used between the two soft input soft output (SISOs) decoders. Extrinsic information exchange for the data and parity bits is optimised according to an appropriate iteration scheduling. Simulation results show a gain of 0.15 dB at a bit error rate (BER) of 10^-4 with this new iterative decoding scheme and the optimised constellation over a nonlinear satellite channel

Keywords

channel coding; error statistics; interleaved codes; iterative decoding; modulation coding; nonlinear codes; phase shift keying; satellite communication; 0.15 dB; 16APSK constellation; BER; QAM; amplitude phase shift keying modulation; bit error rate; bit interleaved coded modulation; extra soft-demapper; extrinsic information exchange; iteration scheduling; iterative decoder; iterative receiver; nonlinear channel; nonlinear satellite channel; nonlinearity effects; soft input soft output decoders; spectral efficiency; square quadrature amplitude modulation; Amplitude modulation; Bit error rate; Gain; Interleaved codes; Iterative decoding; Modulation coding; Phase modulation; Phase shift keying; Quadrature amplitude modulation; Satellites;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications Theory Workshop, 2006. Proceedings. 7th Australian

Conference_Location

Perth, WA

Print_ISBN

1-4244-0213-1

Type

conf

DOI

10.1109/AUSCTW.2006.1625258

Filename

1625258