Using Orthogonal and Quasi-Orthogonal Designs in Wireless Relay Networks

Distributed space-time coding was proposed to achieve cooperative diversity in wireless relay networks without channel information at the relays. Using this scheme, antennas of the distributive relays work as transmit antennas of the sender and generate a space-time code at the receiver. It achieves...

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Vydáno v:	IEEE transactions on information theory Ročník 53; číslo 11; s. 4106 - 4118
Hlavní autoři:	Jing, Y., Jafarkhani, H.
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	New York, NY IEEE 01.11.2007 Institute of Electrical and Electronics Engineers The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Témata:	Analysis Analytical models Antennas Applied sciences Channels Coding coding gain Coding, codes Decoding Design engineering distributed space-time coding diversity Electric power lines Error analysis Exact sciences and technology Information analysis Information theory Information, signal and communications theory Networks orthogonal and quasi-orthogonal designs Pairwise error probability pairwise error probability (PEP) Radiocommunications Receiving antennas Relay Relay network Relay networks Relays Signal and communications theory Simulation Telecommunications Telecommunications and information theory Teleprocessing networks. Isdn Transmitters Transmitting antennas Valuation and optimization of characteristics. Simulation Wireless networks Performance evaluation Space-time codes Relay Relay network Error probability distributed space-time coding Wireless telecommunication Error rate orthogonal and quasi-orthogonal designs Random codes Transmission time diversity Relay channel Simulation Orthogonal code Transmitting antenna Coding pairwise error probability (PEP) coding gain Algorithm complexity Linear complexity Data transmission network Antenna array
ISSN:	0018-9448, 1557-9654
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Popis
Shrnutí:	Distributed space-time coding was proposed to achieve cooperative diversity in wireless relay networks without channel information at the relays. Using this scheme, antennas of the distributive relays work as transmit antennas of the sender and generate a space-time code at the receiver. It achieves the maximal diversity when the transmit power is infinitely large. This paper is on the design of practical distributed space-time codes (DSTCs). We use orthogonal and quasi-orthogonal designs which are originally used in the design of space-time codes for multiple-antenna systems. It is well known that orthogonal space-time codes have full diversity and linear decoding complexity. They are particularly suitable for transmissions in the network setting using distributed space-time coding since their "scale-free" property leads to good performance. Our simulations show that they achieve lower error rates than the random code. We also compare distributed space-time coding to selection decode-and-forward using the same orthogonal designs. Simulations show that distributed space-time coding achieves higher diversity than selection decode-and-forward (DF) when there is more than one relay. We also generalize the distributed space-time coding scheme to wireless relay networks with channel information at the relays. Although our analysis and simulations show that there is no improvement in the diversity, in some networks, having channel information at the relays saves both the transmission power and the transmission time.
Bibliografie:	SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 14 ObjectType-Article-1 ObjectType-Feature-2 content type line 23 ObjectType-Article-2
ISSN:	0018-9448 1557-9654
DOI:	10.1109/TIT.2007.907516