Computer Science – Information Theory
Scientific paper
2011-09-29
Computer Science
Information Theory
Number of Figures: 4, Number of Tables: 1, Keywords: Partial relay selection, unified performance expression, average bit erro
Scientific paper
Relay technology has recently gained great interest in millimeter wave (60 GHz or above) radio frequencies as a promising transmission technique improving the quality of service, providing high data rate, and extending the coverage area without additional transmit power in deeply shadowed wireless environments. The performance of relay-based systems depends considerably on which relay selection protocols are used. These protocols are typically using the channel side information (CSI). Specifically, the relay terminal (RT) is chosen among all available RTs by a centralized entity (CE) which receives all RTs' CSI via feedback channels. However, in the millimeter wave radio frequencies, the rate of the variation of the CSI is much higher than that of a classical system operating in 6 GHz frequencies under the same mobility conditions, which evidently results in a serious problem causing outdated (inaccurate) CSI for the relay selection protocol at the CE since the feedback channels have a backhaul / transmission delay. However and fortunately, the shadowing side information (SSI) changes more slowly in comparison with the rate of the variation of the full CSI. In this context, we propose in this paper a partial relay selection protocol in dual-hop relaying system, which utilize the SSI of the RTs instead of the CSI. Using the unified performance expression introduced in [1], we obtain an exact average unified performance (AUP) of the protocol over generalized fading environments. As a result, we offer a generic AUP expression whose special cases include the average bit error probability (BEP) for binary modulation schemes, the ergodic capacity and the moments-generating function. The correctness of our newly theoretical results is validated with some selected numerical examples in an extended generalized-K fading environment.
Alouini Mohamed-Slim
Yilmaz Ferkan
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