On the Optimal Transmission in Multihop Relay Networks over Rayleigh Fading Channels

Guobing LI  Shihua ZHU  Hui HUI  Yongliang GUO  

IEICE TRANSACTIONS on Communications   Vol.E92-B   No.6   pp.2341-2344
Publication Date: 2009/06/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E92.B.2341
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
wireless networks,  multihop relaying,  outage capacity,  power allocation,  

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In this letter we investigate the relaying strategies for multihop transmission in wireless networks over Rayleigh fading channels. Theoretical analysis reveals that equally allocating power among all transmitters and placing relays equidistantly on the line between source and destination are optimal in terms of outage capacity. Then equal time duration for the transmission of each hop is also proved to be optimal. Furthermore, the optimum number of hops is also derived and shown to be inversely proportional to the signal-to-noise ratio (SNR). Numerical simulations agree well with the reported theoretical results.