A New Adaptive Distributed Space-Time-Coding Scheme for Cooperative Relaying

Jamshid Abouei, Hossein Bagheri and Amir K. KhandaniAbstractA non-regenerative dual-hop wireless system based on a distributed space-time-coding strategyis considered. It is assumed that each relay station retransmits an appropriate scaled space-timecoded version of the received signals. The main goal of this paper is to provide an analyticalstudy of an optimum power allocation strategy in relay stations in order to satisfy the quality ofservice requirements. In the high signal-to-noise ratio (SNR) regime for the relay-destination link,it is shown that the optimum power allocation strategy in each relay that minimizes the outageprobability is to remain silent, if its direct channel gain with the source is less than a prespecifiedthreshold level. The Monte-Carlo simulations show that the optimum power allocation scheme ineach relay in order to minimize the outage probability or the frame-error rate is the threshold-based on-off power scheme (i.e., the relay which its channel gain with the source is above a certainthreshold transmits at full power). Also, the numerical results show a dramatical improvement inthe system performance by using this scheme in comparison with the case that the relay stationsforward their received signals with full power.

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