Power and rate adaptation for MQAM/OFDM systems under fast fading channels

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Date

2012

Authors

Dong, Zhicheng
Fan, Pingzhi
Zhou, Weixi
Panayırcı, Erdal

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IEEE

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Abstract

In this paper the effect of power and rate adaptation on the spectral efficiency of orthogonal frequency division multiplexing (OFDM) systems using M-ary quadrature amplitude modulation (MQAM) is investigated in the presence of the fast fading channels under power and instantaneous bit error rate (BER) constraints. A lower bound on the maximum spectral efficiency of adaptive OFDM/MQAM systems is obtained together with a closed-form expression for the average spectral efficiency of adaptive OFDM systems. Theoretical and numerical results show that the adaptive MQAM/OFDM systems under fast fading channel have substantial gain in spectral efficiency over the non-adaptive counterparts.

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Orthogonal Frequency Division Multiplexing (OFDM), Intercarrier Interference (ICI), Power and rate adaptation, Spectral efficiency, High mobility

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