Pre-processing optimization for IBI mitigation in an OFDM system over channels with large delay spreads.

Abstract: When the cyclic prefix (CP) in an orthogonal frequency division multiplexing (OFDM) system is shorter than the delay span of wireless channels, inter-block interference (IBI) and inter-carrier interference (ICI) will occur. To effectively mitigate interference in this case, pre-processing approaches at transmitters based on full channel state information (CSI) have been proposed. However, feeding full CSI back will occupy significant bandwidth and is impractical sometimes. Therefore, a pre-processing optimization exploiting limited CSI is investigated in this paper; several pre-processing optimization approaches have been developed. Simulation results show that the proposed algorithms can effectively cancel the IBI and ICI and significantly improve the performance in OFDM systems. [ABSTRACT FROM AUTHOR]