Title :
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
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;
Conference_Titel :
Communications Theory Workshop, 2005. Proceedings. 6th Australian
Conference_Location :
Brisbane, Qld.
Print_ISBN :
0-7803-9007-5
DOI :
10.1109/AUSCTW.2005.1624230
