Full length article: Pre-processing optimization for IBI mitigation in an OFDM system over channels with large delay spreads

Authors:
Xia Wang;Geoffrey Ye Li;Hongjie Hu;Long Qin;Anthony C. K. Soong
Affiliations:
School of Electric and Information Engineering, Xi'an Jiaotong University and State Key Lab. of ISN (Xidian University), Xi'an, China and School of ECE, Georgia Institute of Technology, Atlanta, G ...;School of ECE, Georgia Institute of Technology, Atlanta, GA, United States;Huawei Technologies, CA, United States;Huawei Technologies, CA, United States;Huawei Technologies, CA, United States
Venue:
Physical Communication
Year:
2010

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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.