Performance Analysis of DE-QPSK with MIMO MRC

In this paper,the symbol error rate(SER) performance of multiple-input multiple-output(MIMO) maximal ratio combining(MRC) systems in Rayleigh fading channels is investigated.Using the results for higher-order powers of the Gaussian Q-function averaged over fading channels,we derive the exact closed-form expressions for the average SER of differentially encoded quadri-phase shift-keying(DE-QPSK) with coherent detection in Rayleigh fading channels.The accuracy of theoretical analysis is verified by computer simulation.Numerical results show that for a fixed total number of transmit and receive antennas,the more-balanced antenna configuration can result in better SER performance of MIMO MRC systems,and when the total number of diversity branches is fixed,better SER performance can be achieved by increasing the total number of antennas.