Combining Successive ICI Cancellation to ICI Suppressed Alamouti Coded OFDM for Frequency Asynchronous Distributed Antenna Systems

We combine successive ICI cancellation scheme to the recently proposed, so called ISDAC OFDM (Interantenna interference Suppressed Distributed Alamouti coded Orthogonal Frequency Division Multiplexing) for frequency asynchronous distributed antenna systems. Due to the superb initial detection reliability of ISDAC OFDM compared to the conventional schemes, the additional improvement by performing iterative ICI cancellation can be dramatically accelerated. We show that the iterative ICI cancellation quickly converges within at most double iterations. The proposed scheme achieves better BER performance compared to other cancellation schemes with the conventional Alamouti coded OFDM and the performance gap increases as the frequency offset between the transmit antennas increases. Moreover, the proposed scheme requires much smaller complexity due to the fast convergence of the iterative ICI cancellation.