Performance of nonuniform M-ary QAM constellation on nonlinear channels

Author

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

Author_Institution

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

fYear

2005

fDate

2-4 Feb. 2005

Firstpage

79

Lastpage

83

Abstract

This paper investigates the effects of the nonequiprobable distribution of a high bandwidth efficiency M-ary QAM signal constellation on the error performance for nonlinear channels. A simple nonlinear channel model where the phase and amplitude of the transmitted samples are distorted by a nonlinear function with additive white Gaussian noise (AWGN) in the downlink was simulated. Simulation results for binary turbo coded modulation (TCM) show a 3 dB improvement when the distribution of the signal constellation is nonequiprobable

Keywords

AWGN channels; bandwidth allocation; binary codes; channel coding; modulation coding; quadrature amplitude modulation; satellite communication; turbo codes; AWGN; TCM; additive white Gaussian noise; binary turbo coded modulation; nonequiprobable distribution; nonlinear channels; nonlinear function; nonlinear satellite; nonuniform M-ary QAM constellation; signal constellation; AWGN; Additive white noise; Bandwidth; Constellation diagram; Downlink; Modulation coding; Nonlinear distortion; Phase distortion; Quadrature amplitude modulation; Turbo codes; Nonequiprobable constellation; high order modulation; nonlinear channel; spectral efficiency;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications Theory Workshop, 2005. Proceedings. 6th Australian

Conference_Location

Brisbane, Qld.

Print_ISBN

0-7803-9007-5

Type

conf

DOI

10.1109/AUSCTW.2005.1624230

Filename

1624230