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Distributed Space-Time Coding in Wireless Relay Networks

Jing, Yindi and Hassibi, Babak (2006) Distributed Space-Time Coding in Wireless Relay Networks. IEEE Transactions on Wireless Communications, 5 (12). pp. 3524-3536. ISSN 1536-1276. doi:10.1109/TWC.2006.256975.

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We apply the idea of space-time coding devised for multiple-antenna systems to the problem of communications over a wireless relay network with Rayleigh fading channels. We use a two-stage protocol, where in one stage the transmitter sends information and in the other, the relays encode their received signals into a “distributed” linear dispersion (LD) code, and then transmit the coded signals to the receive node. We show that for high SNR, the pairwise error probability (PEP) behaves as (log P/P)min{T,R}, with T the coherence interval, that is, the number of symbol periods during which the channels keep constant, R the number of relay nodes, and P the total transmit power. Thus, apart from the log P factor, the system has the same diversity as a multiple-antenna system with R transmit antennas, which is the same as assuming that the R relays can fully cooperate and have full knowledge of the transmitted signal. We further show that for a network with a large number of relays and a fixed total transmit power across the entire network, the optimal power allocation is for the transmitter to expend half the power and for the relays to collectively expend the other half. We also show that at low and high SNR, the coding gain is the same as that of a multiple-antenna system with R antennas. However, at intermediate SNR, it can be quite different, which has implications for the design of distributed space-time codes.

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Additional Information:© Copyright 2006 IEEE. Reprinted with permission. Manuscript received August 13, 2004; revised August 20, 2005 and April 28, 2005; accepted January 5, 2006. [Posted online: 2006-12-11] The associate editor coordinating the review of this paper and approving it for publication was R. Negi. This work was supported in part by the National Science Foundation under grant no. CCR-0133818, by the office of Naval Research under grant no. N00014-02-1-0578, and by Caltech’s Lee Center for Advanced Networking.
Subject Keywords:Space-time coding, multiple-antenna systems, wireless relay networks, Rayleigh fading channels
Issue or Number:12
Record Number:CaltechAUTHORS:JINieeetwc06
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:7270
Deposited By: Archive Administrator
Deposited On:25 Jan 2007
Last Modified:08 Nov 2021 20:40

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