Impact of HPA nonlinearity on MIMO systems with quantized equal gain transmission

Qi, J. and Aissa, S. (2009) Impact of HPA nonlinearity on MIMO systems with quantized equal gain transmission. In: 2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications. IEEE, pp. 2891-2895. ISBN 9781424451227 doi: 10.1109/PIMRC.2009.5450073

Abstract/Summary

In this paper, we investigate the performance of multiple-input multiple-output (MIMO) transmit beamforming (TB) systems in the presence of nonlinear high-power amplifiers (HPAs). Due to the suboptimality of maximal ratio transmission/maximal ratio combining (MRT/MRC) under HPA nonlinearity, quantized equal gain transmission (QEGT) is suggested as a feasible TB scheme. The effect of HPA nonlinearity on the performance of MIMO QEGT/MRC is evaluated in terms of the average symbol error probability (SEP) and system capacity, considering transmission over uncorrelated quasi-static frequency-flat Rayleigh fading channels. Numerical results are provided and show the effects of several system parameters, such as the parameters of nonlinear HPA, cardinality of the beamforming weight vector codebook, and modulation order of quadrature amplitude modulation (QAM), on performance.