Decode and Forward Relays: Full Diversity With Randomized Distributed Space-Time Coding

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Executive Summary

Space diversity is a very well known technique to improve the reliability and the throughput of the link in wireless communications. One of the most promising ways of generating space diversity is through cooperative communications. The leading idea is the transposition of space diversity principles to systems where portability constraints hinder the presence of multiple antennas on a single user device: a set of terminals shares information to mimic a virtual antenna array. The problem of obtaining the capacity of a cooperative network is still open, as well as the identification of the optimum cooperation strategy: the number of degrees of freedom is huge and involves different communication layers (offers an interesting overview related to this issue).

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