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H_{\infty } Channel Estimator Design for DS-CDMA Systems: A Polynomial Approach in Krein Space

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3 Author(s)
Chengtao Cao ; Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore ; Lihua Xie ; Huanshui Zhang

This paper considers the problem of robust channel estimation for direct-sequence code-division multiple-access (DS-CDMA) systems with time-varying multipath fading channels. Due to the lack of accurate knowledge of model dynamics and statistics of system noises, a polynomial channel estimator is developed by virtue of the Krein space theory. The estimator is calculated by performing a J-spectral factorization. In this paper, under some conditions, we obtain a closed-form solution to this J-spectral factorization, which greatly reduces the computational load of the estimator design. The simulation results show that the proposed estimator provides a robust estimation performance against various types of noises and modeling errors.

Published in:

Vehicular Technology, IEEE Transactions on  (Volume:57 ,  Issue: 2 )

Date of Publication:

March 2008

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