Asymptotic Performance Analysis of Multihop Relayed Transmissions over Nakagami-m Fading Channels

Zhaoxi FANG  Liangbin LI  Zongxin WANG  

IEICE TRANSACTIONS on Communications   Vol.E91-B   No.12   pp.4081-4084
Publication Date: 2008/12/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e91-b.12.4081
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Broadcast Systems
multihop communications,  average BER,  Nakagami-m fading channels,  amplify-and-forward,  

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This letter studies the asymptotic bit error rate (BER) performance of multihop communication systems with amplify-and-forward relaying over Nakagami-m fading channels. Since it is difficult to find the exact probability density function (PDF) of the output signal-to-noise ratio (SNR) at the destination, we resort to the series expansion of this PDF in the neighborhood of zero. Building upon this result, a closed-form expression for the average BER in the high SNR region is derived. Numeric results show that the derived asymptotic BER expression is accurate at medium and high SNR for both independent identically distributed (i.i.d.) and independent non-identically distributed (i.n.i.d.) channels.