Rate Optimization for Energy Efficient System with M-QAM
Résumé
In this paper, we have considered the optimization
of the data rate in the case of point-to-point transmission
with M-ary quadrature amplitude modulation (M-QAM). The
main goal is to minimize the bit energy consumption under an
average bit error rate (BER) constraint in additive white gaussian
noise (AWGN) and Rayleigh channel. With the evolution of
wireless communication towards shorter transmission distances,
the circuit energy in system hardware becomes significant in the
computation of the energy expenditure as well as the transmission
energy. We use an accurate power model for the circuit energy
consumption. The total energy consumption is then formulated as
a function of the constellation size, distance, bandwidth and other
channel parameters. Optimal data rate is obtained in closed form
expression and the effect of bandwidth, distance and channel path
loss is studied.