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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.

Published in:

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

Date of Publication:

May 2004

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