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Space-time diversity enhancements using collaborative communications

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3 Author(s)
Mitran, P. ; Div. of Eng. & Appl. Sci., Harvard Univ., Cambridge, MA, USA ; Ochiai, H ; Tarokh, Vahid

The use of the spatial dimension is known to greatly increase the reliability of quasi-static (i.e., nonergodic) wireless channels. In this paper, it is demonstrated that most of this gain can also be achieved through collaborative communications with single-antenna/multiple-antenna nodes when there is one receiving agent. In particular, for the single-antenna case, communication is considered to take place between clusters of nearby nodes. The existence of collaborative codes for which the intra-cluster negotiation penalty is, in principle, small (and almost all the diversity gain of traditional space-time codes may be realized) is shown. For example, for a single transmitter node with two collaborators and one receiver node, if the collaborators have as little as a 10-dB path loss advantage over the receiver, the penalty for collaboration over traditional space-time systems is negligible.

Published in:

Information Theory, IEEE Transactions on  (Volume:51 ,  Issue: 6 )

Date of Publication:

June 2005

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