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Multiuser Detection for DS-CDMA Systems on Nakagami-0.5 Fading Channels with Impulsive Noise

Vinay Kumar Pamula 1, Habibulla Khan 2, Srinivasa Rao Vempati 3, Anil Kumar Tipparti 4,
1. Department of ECE, UCEK, JNTUK, Kakinada, India
2. Department of ECE, KL University, Vaddeswaram, India
3. Department of ECE, Anurag Engineering College, Kodad, India
4. Department of ECE, SR Engineering College, Warangal, India
Abstract—Recent attention has been given to Nakagami-0.5 fading channel as a special case of Nakagami-m fading channel with m = 0.5 and as a worst-case (severe) fading scenario. This paper presents a study on the performance analysis of a robust multiuser detector for direct sequence-code division multiple access (DS-CDMA) systems including maximal ratio combining (MRC) receive diversity. A new M-estimator, which performs well in the heavy-tailed impulsive noise, proposed to robustify the detector is also studied and analyzed by deriving average probability of error over a single path Nakagami-0.5 fading channel. Numerical results show the efficacy of the proposed M-estimator, under severe fading conditions of Nakagami-m channel, in comparison with linear decorrelating detector, the Huber and the Hampel estimator based detectors.

Index Terms—CDMA, influence function, maximal ratio combiner, M-estimator, multiuser detection, Nakagami-m fading

Cite: Vinay Kumar Pamula, Habibulla Khan, Srinivasa Rao Vempati, and Anil Kumar Tipparti, "Multiuser Detection for DS-CDMA Systems on Nakagami-0.5 Fading Channels with Impulsive Noise," International Journal of Electrical Energy, Vol. 2, No. 1, pp. 23-27, March 2014. doi: 10.12720/ijoee.2.1.23-27
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