Distributed Space-Time Coding in Wireless Relay Networks

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 receiv...

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Veröffentlicht in:	IEEE transactions on wireless communications Jg. 5; H. 12; S. 3524 - 3536
Hauptverfasser:	Jing, Y., Hassibi, B.
Format:	Journal Article
Sprache:	Englisch
Veröffentlicht:	Piscataway, NJ IEEE 01.12.2006 Institute of Electrical and Electronics Engineers The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Schlagworte:	Antennas Applied sciences Channels Codes Coding Digital relays Diversity methods Exact sciences and technology Fading Networks Pairwise error probability Power system relaying Protocols Radiocommunications Relay Relay networks Space time codes Systems, networks and services of telecommunications Telecommunications Telecommunications and information theory Transmission and modulation (techniques and equipments) Transmitters Transmitters. Receivers Transmitting antennas Wireless communication Wireless networks Fading channels Space-time codes Multistage method Relay Space-time coding Error probability Wireless telecommunication multiple-antenna systems Rayleigh channels Transmitter Rayleigh fading channels Power allocation Linear code Optimal allocation Transmitting antenna Coding Coherence wireless relay networks Antenna array Signal to noise ratio
ISSN:	1536-1276, 1558-2248
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Zusammenfassung:	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 (logP/P) min{TH} , 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
Bibliographie:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 content type line 23
ISSN:	1536-1276 1558-2248
DOI:	10.1109/TWC.2006.256975