Title :
Optimal ASK and QAM with non-equal symbol probabilities on Rayleigh fading channels
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Univ. of Central Florida, Orlando, FL, USA
Abstract :
Formulas are derived to compute the optimal signal constellation, bit error probabilities, and decision thresholds for M-ASK and QAM with non-equal prior symbol probabilities on Rayleigh fading channels. It is shown that the optimal system can improve average Eb/N0 by 5 dB compared to a conventional system, i.e. a system with source coding, equiprobable symbols, and equal space constellation.
Keywords :
Rayleigh channels; amplitude shift keying; error statistics; probability; quadrature amplitude modulation; M-ASK; QAM; Rayleigh fading channels; amplitude shift keying; bit error probabilities; equal space constellation; equiprobable symbols; non-equal symbol probabilities; optimal signal constellation; quadrature amplitude modulation; source coding;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2010.7876
