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Mitigation of channel estimation error in TR–UWB system based on a novel MMSE equalizer

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Abstract

The time reversal (TR) technique combined with the ultra-wideband (UWB) system offers a new potential for decreasing the cost and complexity of the UWB receivers. In spite of TR–UWB's good performance in perfect channel state information (CSI), it is very sensitive to the channel estimation error. The effect of channel imperfection on the TR–UWB system is considered in this paper. At first, based on a minimum mean square error (MMSE) equalizer receiver, a prefilter is calculated in closed form to improve the performance of the TR–UWB system in an imperfect CSI scenario. Furthermore, for comparison purposes, a similar calculation for prefilter is carried out based on a simple matched filter (MF) receiver. Then, in order to improve the MF receiver performance, a two-stage iteration-based algorithm is developed. The initial value for this iteration-based improved algorithm is considered to be a prefilter which is calculated in the TR–UWB system with MMSE equalizer. This optimized algorithm causes the channel estimation error in the TR–UWB system to become zero in some steps. Finally, exhaustive simulations are done to demonstrate the performance advantage attained by the improved algorithm.

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Acknowledgments

The authors would like to thank the reviewers for their valuable comments to improve the quality of the work and Mr. Taotao Wang, PhD candidate in the Department of Information Engineering of the Chinese University of Hong Kong, for valuable guidelines on the simulation results.

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  1. Electrical and Electronic Engineering University Complex (EEEUC), Tehran, Iran

    H. Khaleghi Bizaki & S. Alizadeh

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  1. H. Khaleghi Bizaki
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  2. S. Alizadeh
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Correspondence to H. Khaleghi Bizaki.

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Khaleghi Bizaki, H., Alizadeh, S. Mitigation of channel estimation error in TR–UWB system based on a novel MMSE equalizer. Ann. Telecommun. 68, 317–325 (2013). https://doi.org/10.1007/s12243-012-0325-8

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  • DOI: https://doi.org/10.1007/s12243-012-0325-8

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