S-DF Cooperative Communication System Over Time Selective Fading Channels
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This paper investigates the impact of node mobility and imperfect channel state information (CSI) on the end-to-end performance of a selective decode-and-forward (S-DF) based multiple-input multi-ple-output (MIMO) space-time block-code (STBC) cooperative wireless system. A closed form expres-sion is derived for the per-block average pair-wise error probability (PEP) for several configurations in terms of number of phases, hops and relays over time selective Rayleigh fading channel, with best relay selection (BRS) and path selection (PS). Further, a framework is developed for deriving the diversity order (DO) for each configuration. Results show that when both destination node (DN) and source node (SN) are immobile, system performance does not encounter asymptotic error floor although relay node (RN) is mobile. Although with mobile RN, the movement of either the DN or the SN critically affects system performance by asymptotic error floors. System performance is analyzed for both equal power and optimal power scenario and the results show that system performance improves with optimal pow-er. Simulation results are in close agreement with the analytical results at high signal to noise ratio (SNR) regimes.
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