Average SEP of Rectangular QAM in Rayleigh Fading with GSC

This letter presents an exact-form expression for the average symbol error probability (SEP) of general rectangular quadrature amplitude modulation (QAM) in Rayleigh fading channels with generalized selection combining (GSC). Expressions for the system average SEP with maximal ratio combining (MRC) and selection combining (SC) are obtained as limiting cases. It is shown that the results herein reduce to some existing ones as special cases.