Timing synchronization for cooperative wireless communications
作者： Md Tofazzal Hossain , None
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摘要: In this work the effect of perfect and imperfect synchronization on performance single-link cooperative communication is investigated. A feedforward nondata-aided near maximum likelihood (NDA-NML) timing estimator which effective for an additive white Gaussian noise (AWGN) channel also a flat-fading channel, developed. The Cramer Rao bound (CRB) modified (MCRB) transmission over AWGN derived. closed form expression probability distribution bit-error-rate (BER) degradation NDA-NML with raised cosine pulse shaping static errors characterized. derived conditional bit error (BEP) binary phase shift keying modulation Rayleigh fading using rectangular shaping. applied to system source, relay destination. CRB asymptotically low signal-to-noise-ratio case complexity compared correlation based data-aided (DA-ML) estimator. BER operating detect-and-forward relaying studied, where symbol timings are estimated independently each channel. data aided (DCA-ML) flat channels then For more severe DCA-ML performs better than NDANML DA-ML gains that become significant in node-to-node transmission. three-node fast conditions various signal constellations. It found have
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