An efficient adaptive distributed space time coding scheme for cooperative relaying

Jamshid Abouei, Hossein Bagheri, Amir K. Khandani
2008 2008 42nd Annual Conference on Information Sciences and Systems  
A non-regenerative dual-hop wireless system based on a distributed space-time-coding strategy is considered. It is assumed that each relay retransmits an appropriately scaled space-time coded version of received signals. The main goal of this paper is to investigate a power allocation strategy in relay stations using analytical and simulation arguments to satisfy the quality of service requirements. In the high signal-to-noise ratio regime for the relay-destination link, it is shown that the
more » ... s shown that the optimum power allocation strategy in each relay which minimizes the outage probability is to remain silent, if its channel gain with the source is less than a prespecified threshold level. The Monte-Carlo simulations show that the near-optimal power allocation scheme in each relay in order to minimize the outage probability or the frame-error rate is the threshold-based on-off power scheme. Also, the numerical results demonstrate a dramatic improvement in the system performance by using this scheme compared to the case that the relay stations forward their received signals with full power. Finally, a hybrid amplify-and-forward/detect-and-forward scheme is numerically evaluated.
doi:10.1109/ciss.2008.4558515 dblp:conf/ciss/AboueiBK08 fatcat:2a7jervpzrbddhbfyv2asjdo5y