Title :
Optimum discrete-power adaptive QAM scheme for Rayleigh fading channels
Author :
Paris, José F. ; del Carmen Aguayo-Torres, M. ; Entrambasaguas, José T.
Author_Institution :
Dept. of Ingenieria de Comunicaciones, Malaga Univ., Spain
fDate :
7/1/2001 12:00:00 AM
Abstract :
In this letter, the utilization of a finite number of power levels per constellation in adaptive QAM schemes for flat fading channels is analyzed. Assuming a maximum target BER, the optimum switching thresholds in order to maximize the spectral efficiency are found for Rayleigh fading. Both analysis and simulation results show that a small number of power levels per constellation allows to obtain a good compromise between high spectral efficiency and low feedback information rate.
Keywords :
Rayleigh channels; adaptive modulation; quadrature amplitude modulation; BER; Rayleigh fading channels; adaptive QAM scheme; feedback information rate; flat fading channels; optimum switching thresholds; power levels per constellation; spectral efficiency maximization; Additive white noise; Associate members; Bit error rate; Fading; Feedback; Information analysis; Information rates; Quadrature amplitude modulation; Rayleigh channels; Signal to noise ratio;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/4234.935742
