Spectrally Efficient Alamouti Code Structure in Asynchronous Cooperative Systems

Mojtaba Rahmati, Tolga M. Duman
2014 IEEE Signal Processing Letters  
A relay communication system with two amplify and forward (AF) relays under flat fading channel conditions is considered where the signals received from the relays are not necessarily time aligned. We propose a new time-reversal (TR)-based scheme providing an Alamouti code structure which needs a smaller overhead in transmitting every pair of data blocks in comparison with the existing schemes and, as a result, increases the transmission rate significantly (as much as 20%) in exchange for a
more » ... l performance loss. The scheme is particularly useful when the delay between the two relay signals is large, e.g., in typical underwater acoustic (UWA) channels.
doi:10.1109/lsp.2014.2308296 fatcat:matemc6iwnddjjqym6ca6lhdcm