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Robust Channel Estimation and Multiuser Detection for MC–CDMA Systems Under Narrowband Interference

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Abstract

In this paper, we present a robust adaptive channel estimator and a robust multiuser detector for wireless multicarrier code-division multiple access (MC–CDMA) systems under narrowband interference (NBI). The conventional least-squares (LS) channel estimator performs poorly when narrowband interfering signals contaminate the multicarrier systems. A new weighted recursive least M-estimate (WRLM) channel estimator is hence developed to estimate multipath fading channels in the presence of NBI. The new robust channel estimator resorts to M-estimate and weighted least-squares (WLS) techniques. Simulations show that the WRLM channel estimator offers substantial performance gain over conventional recursive least-squares (RLS), recursive least M-estimate (RLM) and weighted RLS (WRLS) channel estimators under NBI. With the estimated channel coefficients, a robust multiuser detector is proposed to jointly suppress multiple access interference (MAI) and NBI. The performance of the linear decorrelator will degrade substantially in the presence of NBI. A weighted least M-estimate (WLM) algorithm is therefore developed to combat the NBI. The WLM multiuser detector is also based on the weighted M-estimate concept. Numerical results show that the proposed WLM multiuser detector significantly outperforms over the conventional linear decorrelator, the robust decorrelator with M-estimate and the WLS detector under NBI.

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Authors and Affiliations

  1. Electrical and Electronic Engineering Department, University of Hong Kong, Pokfulam Road, Hong Kong, Hong Kong

    H. Cheng, S. C. Chan & Z. G. Zhang

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  1. H. Cheng
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  2. S. C. Chan
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  3. Z. G. Zhang
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Correspondence to H. Cheng.

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Cheng, H., Chan, S.C. & Zhang, Z.G. Robust Channel Estimation and Multiuser Detection for MC–CDMA Systems Under Narrowband Interference. J Sign Process Syst Sign Image Video Technol 52, 165–180 (2008). https://doi.org/10.1007/s11265-007-0145-7

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  • DOI: https://doi.org/10.1007/s11265-007-0145-7

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