An Approximation of the Average BER Performance of Multi-Hop AF Relaying Systems with Fixed Gain

JunKyoung LEE
SeungHun JANG
JangHoon YANG
DongKu KIM

IEICE TRANSACTIONS on Communications   Vol.E92-B    No.10    pp.3280-3284
Publication Date: 2009/10/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E92.B.3280
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Broadcast Systems
wireless relay channel,  multi-hop relay,  amplify-and-forward,  AF fixed gain relay,  

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In this letter, we present a closed-form bound of the average bit error rate (BER) performance for the multi-hop amplify-and-forward (AF) relaying systems with fixed gain in Rayleigh fading channel. The proposed bound is derived from the probability density function (PDF) of the overall multi-hop relay channel under the assumption of asymptotic high signal-to-noise ratio (SNR) at every intermediate relays. When intermediate relays actually operate at finite SNR, the proposed BER bound becomes looser as the SNR of the last hop increases. In order to reflect the effect of all the noise variances of relay links to the BER evaluation, a hop-indexed recursive BER approximation is proposed, in which the proposed bound of BER under asymptotic high SNR is used. The simulation results manifest that the proposed hop-indexed recursive BER approximation can not only guarantee accuracy regardless of the SNR of the last hop but also provide higher accuracy than the previous works.