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Moments-based approach to the performance analysis of equal gain diversity in Nakagami-m fading

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1 Author(s)
Karagiannidis, G.K. ; Nat. Obs. of Athens, Inst. for Space Applic. & Remote Sensing, Athens, Greece

In this letter, an alternative moments-based approach for the performance analysis of an L-branch predetection equal gain combiner (EGC) over independent or correlated Nakagami-m fading channels is presented. Exact closed-form expressions are derived for the moments of the EGC output signal-to-noise ratio (SNR), while the corresponding moment-generating function (MGF) is accurately approximated with the aid of Pade´ approximants theory. Important performance criteria are studied; the average output SNR, which is expressed in closed form both for independent and correlative fading and for arbitrary system parameters, the average symbol-error probability for several coherent, noncoherent, and multilevel modulation schemes, and the outage probability, which are both accurately approximated using the well-known MGF approach. The proposed mathematical analysis is illustrated by various numerical results, and computer simulations have been performed to verify the validity and the accuracy of the theoretical approach.

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Communications, IEEE Transactions on  (Volume:52 ,  Issue: 5 )