Channel Estimation of Rapidly Time-Varying Channels for OFDM Systems

Hu Die; He Liang-hua; Yang Lü-xi

doi:10.3724/SP.J.1146.2005.00528

Volume 29 Issue 1

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Hu Die, He Liang-hua, Yang Lü-xi. Channel Estimation of Rapidly Time-Varying Channels for OFDM Systems[J]. Journal of Electronics & Information Technology, 2007, 29(1): 113-116. doi: 10.3724/SP.J.1146.2005.00528

Citation:

Hu Die, He Liang-hua, Yang Lü-xi. Channel Estimation of Rapidly Time-Varying Channels for OFDM Systems[J]. Journal of Electronics & Information Technology, 2007, 29(1): 113-116. doi: 10.3724/SP.J.1146.2005.00528

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Channel Estimation of Rapidly Time-Varying Channels for OFDM Systems

doi: 10.3724/SP.J.1146.2005.00528

Received Date: 2005-05-12
Rev Recd Date: 2005-11-23
Publish Date: 2007-01-19

Abstract

Abstract

In Orthogonal Frequency-Division Multiplexing (OFDM) systems, how to estimate rapidly time-varying channels exactly is a challenge issue. In this paper, relying on a basis expansion channel model, a channel estimation scheme of rapidly time-varying channels is proposed for OFDM systems. Along with the channel estimation scheme, the optimal pilot sequence and optimal placement of the pilot tones are also derived with respect to the mean square error (MSE) of the channel estimate. It is shown that the optimal pilot sequence consists of some adjacent equipowered and equispaced subsequences, and each of them is constrained by certain phase conditions. Simulation results demonstrate the effectiveness of the proposed channel estimation scheme in rapidly time-varying scenarios and the superiority of using the derived optimal pilot sequences.

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References(1)

References

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