Turbo Equalization Based on a New Kalman Filter for OFDM over Doubly-Selective Channels

Tu Jia; Cai Yue-ming; Xu You-yun

doi:10.3724/SP.J.1146.2008.00787

Volume 31 Issue 6

Jun. 2009

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Tu Jia, Cai Yue-ming, Xu You-yun. Turbo Equalization Based on a New Kalman Filter for OFDM over Doubly-Selective Channels[J]. Journal of Electronics & Information Technology, 2009, 31(6): 1390-1394. doi: 10.3724/SP.J.1146.2008.00787

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Tu Jia, Cai Yue-ming, Xu You-yun. Turbo Equalization Based on a New Kalman Filter for OFDM over Doubly-Selective Channels[J]. Journal of Electronics & Information Technology, 2009, 31(6): 1390-1394. doi: 10.3724/SP.J.1146.2008.00787

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Turbo Equalization Based on a New Kalman Filter for OFDM over Doubly-Selective Channels

doi: 10.3724/SP.J.1146.2008.00787 cstr: 32379.14.SP.J.1146.2008.00787

Received Date: 2008-06-19
Rev Recd Date: 2008-11-24
Publish Date: 2009-06-19

Abstract

Abstract

In OFDM systems，the channel fast variations destroy the orthogonality among sub-carriers, resulting in inter-carrier interference (ICI) which degrades the system performance. Aiming at time-varying characteristic of doubly-selective channels, a channel estimation algorithm is proposed by a new Kalman filter, and is applied to the Oversampled Complex Exponential Basis Expansion Model (OCE-BEM), changing the variable channel parameters in the period of one OFDM symbol into invariable ones. Meanwhile, this new Kalman filter is combined with the low complexity LMMSE Turbo equalizer based on ICI suppression, and CRC checkout is used to control the iteration times of the algorithm, so it need not many pilot symbols in practice, still can ensure the algorithm performance and reduce the time-delay and complexity of this algorithm.

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References(1)

References

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