IBI cancellation based on limited channel feedback for OFDM systems over channels with large delay spreads

Authors:
Xia Wang;Geoffrey Ye Li;Hongjie Hu;Long Qin;Anthony C. K. Soong
Affiliations:
School of EIE, Xi'an Jiaotong University, Xi'an, Shaanxi, China;School of ECE, Georgia Institute of Technology, Atlanta, GA;Wireless Advanced Research, Huawei Technologies, Plano, TX;Wireless Advanced Research, Huawei Technologies, Plano, TX;Wireless Advanced Research, Huawei Technologies, Plano, TX
Venue:
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Year:
2009

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Abstract

While cyclic prefix (CP) is no larger than the delay span of wireless channels in an orthogonal frequency division multiplexing (OFDM) system, inter-block interference (IBI) and inter-carrier interference (ICI) will occur and the performance of the system will be deteriorated. If OFDM is designed with long enough CP, the efficiency of OFDM modulation is significantly reduced. To effectively mitigate interference over channel with large delay spreads, 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, pre-processing optimization exploiting limited CSI feedback is investigated in this paper. An pre-processing optimization approaches for IBI and ICI mitigation has been developed and tested. Computer simulation result shows that the proposed optimization algorithm can effectively cancel IBI and ICI over channels with large delay spreads and significantly improve the performance for OFDM systems.