Abstract
In adaptive quadrature amplitude modulation (QAM), transmission rate is dynamically adjusted based on the condition of the wireless channel. In this paper, a novel QAM rate adaptation method for Rayleigh flat-fading channel is proposed and the mathematical model of the QAM rate adaptive system is established. The transmission rate is defined as a function of output error feedback and it is designed to drive the output error to zero at steady state such that the bit error rate (BER) equals the required value. Simulation results show that the performance of the proposed error feedback adaptation method agrees with the conventional threshold-based adaptation method in terms of the channel spectral efficiency and BER. Moreover, the mathematical model established in this paper has its potential in further design of a robust controller against uncertainty of the wireless channel conditions.
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