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—For the decode-and-forward protocol in relay networks , opportunistic relaying (OR) and selection cooperation (SC) are two major relay selection schemes, which have been studied only for single antenna terminals. We study OR and SC in a multi-antenna relay network where each terminal has multiple antennas. To fully exploit multiple antennas without(More)
are composed of source and destination nodes with multiple antennas. But, when nodes cannot support multiple antennas due to size or other constraints, especially for mobiles, the MIMO cannot be used to provide diversity. Cooperative communication enables single antenna to realize a virtual multiple antenna transmitter by sharing their antennas. Therefore,(More)
In this letter, a fine carrier frequency offset (CFO) estimator is proposed for ultra-wideband multiband orthogonal frequency division multiplexing (UWB MB-OFDM) systems. The proposed scheme uses a frequency-domain spreaded data symbol which is provided in the MB-OFDM system, thus removing the need of training symbols. Analytical expression of the mean(More)