Iterative estimation of doubly selective channels with ICI suppression for OFDM using KL-BEM |
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Authors: | CHEN Dong-hua QIU Hong-bing |
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Affiliation: | [1]School of Telecommunications Engineering, Xidian University, Xi'an 710071, China [2]Information and Communication College, Guilin University of Electronic Technology, Guilin 54 1004, China |
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Abstract: | Channel estimation for orthogonnl frequency division multiplexing(OFDM)systems operating over doubly selective channels is complicated by the existence of intercarrier interference(ICI).This paper extends the idea of estimating time-variant channel impulse response(CIR)via time-averaged CIR.proposed by Hijazi,and proposes a low-complexity channel estimation scheme with ICI suppression based on Karhnnen-Loeve basis expansion model(KL-BEM),which is in a more general form.In the proposed scheme,the KL-BEM coefficients are obtained through their numerical relationship with the time-averaged CIR.The estimation performance is improved by adopting an expectation-maximization(EM)-based iterative structure combined with a low-complexity ICI equalizer and canceller.Theoretical analysis and simulation results show that the proposed scheme achieves superior performance over the original one with lower computational complexity. |
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Keywords: | OFDM doubly selective channels channel estimation ICI |
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