Precoded OFDM System for ICI Mitigation over Time-Frequency Selective Fading Channels |
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Authors: | LONG Yi KUANG Linling LU Jianhua |
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Institution: | LONG Yi,KUANG Linling,LU Jianhua Department of Electronic Engineering,Tsinghua University,Beijing 100084,China |
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Abstract: | In orthogonal frequency-division multiplexing (OFDM) systems, the capability to support high mo-bility is greatly limited by the intercarrier interference (ICI) caused by time-frequency selective fading chan-nels. This paper presents a precoded OFDM system for ICI mitigation. A precoder is introduced to relieve the ICI by transmitting N-point composite information symbols at twice the subcarrier interval. A Ha-damard-matrix-like pilot pattern is used to recover the composite information symbols in a postprocessor at the receiver. Simulations show that, compared to the conventional self-cancellation scheme, this scheme gives much better signal-to-interference-noise ratio performance with much less overhead. Furthermore, the scheme can support twice the vehicle speed in time-frequency selective fading channels than the standard OFDM systems without ICI mitigation. |
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Keywords: | orthogonal frequency-division multiplexing (OFDM) time-varying multipath intercarrier interference |
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