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A Partial PIC Based Receiver Design for SFBC-OFDM Cooperative Relay Systems

Space frequency block codes (SFBC) have been widely adopted with orthogonal frequency division multiplexing (OFDM) to achieve both spatial and frequency diversity. However, OFDM is very sensitive to carrier frequency offset (CFO), which would cause intercarrier interference (ICI) and degrade the system performance severely. In this paper, we propose a low-complexity partial parallel interference cancellation (PIC) based receiver with common CFO compensation, modified SFBC decoding, and iterative partial PIC for Alamouti coded SFBC-OFDM cooperative relay systems. For the proposed receiver, the received signal is first compensated by a common CFO value to mitigate the effect of different CFOs from the distributed relays, and then the result is processed by a modified SFBC decoder. The decoded data is subsequently fed back to reconstruct the ICI for use in the developed partial PIC procedure. As compared with a previous related work, the proposed partial PIC based receiver achieves better performance with lower computational complexity.