NDLI: Distributed space-time codes in wireless relay networks

Content Provider	IEEE Xplore Digital Library
Author	Jing, Y. Hassibi, B.
Copyright Year	2004
Description	Author affiliation: Dept. of Electr. Eng., California Inst. of Technol., Pasadena, CA, USA (Jing, Y.; Hassibi, B.)
Abstract	We apply the idea of space-time coding devised for multiple antenna systems to the communication over a wireless relay network. We use a two stage protocol, where in one stage the transmitter sends information and in the other, the relay nodes encode their received signals into a "distributed" linear dispersion code, and then transmit the coded signals to the receiver. We show that for high SNR the pairwise error probability (PEP) behaves as (log P/P)/sup min{T,R}/ with T the coherence interval, R the number of relay nodes and P the total transmit power. Thus, apart from the log P factor and assuming T/spl ges/R, the system has the same diversity as a multi-antenna system with R transmit antennas, which is the same as assuming that the R relay nodes can fully cooperate and have full knowledge of the transmitted signal. We further show that for 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 multi-antenna system with R antennas. At intermediate SNR, it can be quite different, which has implications for the design of distributed space-time codes.
Starting Page	249
Ending Page	253
File Size	871908
Page Count	5
File Format	PDF
ISBN	0780385454
DOI	10.1109/SAM.2004.1502947
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-07-18
Publisher Place	Spain
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Space time codes Intelligent networks Relays Power system relaying Transmitters Protocols Transmitting antennas Fading Space technology Wireless communication
Content Type	Text
Resource Type	Article

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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