Accurate MGF matching technique for diversity reception in correlated lognormal fading channels

The two-point moment generating function (MGF) matching technique has been used with some success to approximate the output from an MRC diversity combiner operating in correlated lognormal fading channels. The technique, however, is very sensitive to the choice of the location of the two matching points. This paper proposes to apply the principle of power conservation across the combiner to control the accuracy of the location of the MGF matching points. The technique is both novel and effective and this is backed by sophisticated simulation results. To demonstrate the accuracy of the proposed MGF matching technique, the paper presents a closed-form expression for the estimation of BER of BPSK using MRC diversity reception in a correlated lognormal shadowing environment.