Performance of Maximal Ratio Combiners over Correlated Nakagami-m Fading Channels with Arbitrary Fading Parameters

In this letter, performance metrics of maximal ratio combiners (MRC) over correlated Nakagami-m fading are calculated with both arbitrary fading parameters and average powers. We derive the moment generating function (MGF) of the sum of correlated gamma variables with arbitrary fading parameters. Using the MGF-based approach, we obtain the variance of the signal-to-noise ratio (SNR) at the output of the combiner, the outage probability, the average symbol error rate for coherent multichannel reception, and the diversity gain. The results for an exponentially decaying model of the fading parameter are presented and discussed.Reig, J. (2008). Performance of Maximal Ratio Combiners over Correlated Nakagami-m Fading Channels with Arbitrary Fading Parameters. IEEE Transactions on Wireless Communications. 7(5):1441-1445. doi:10.1109/TWC.2008.060129S144114457

Capacity and performance analysis for hybrid selection/maximal-ratio combining in Nakagami fading with unequal fading parameters and branch powers

[[abstract]]We consider a hybrid selection/maximal-ratio combining (HS/MRC) diversity system and assume independent Nakagami fading on the diversity branches with unequal fading parameters and unequal signal-to-noise ratios (SNR's). We use the virtual branch technique and two series expressions for the characteristic function (CF) of the sum of independent gamma random variables to derive closed-form expressions for CF, the probability density function (PDF), the mean, and the variance of the instantaneous combiner output SNR. We also obtain closed-form expressions for the outage probability, the channel capacity under different transmission policies, and the average symbol error probability (SEP) for a general class of M-ary modulation schemes (including MPSK, MQAM, BFSK, and MSK) with coherent detection. Our approach provides a canonical structure for the closed-form expressions, which are the closed-form expressions for a single-branch system in different Nakagami fading environments.[[fileno]]2030115030017[[department]]電機工程學