Differentially coherent blind adaptive receiver for Rayleigh fading CDMA channels

Insoo Sohn, Someshwar C. Gupta

Research output: Contribution to journalArticlepeer-review

Abstract

Interest in code division multiple access (CDMA) has increased dramatically in both the industry and academia. This is due to the potential increase in user capacity and interference, multipath fading, and jam-resistant capabilities. Different approaches of multiuser detection schemes have shown improvement over the conventional receiver. However, multiuser detectors require system parameters and adaptive multiuser receivers require training sequences. These parameters are difficult to obtain in multipath fading channels with a degradation in performance. A blind adaptive multiuser receiver for flat fading and frequency-selective fading environments is studied in this paper. This receiver alleviates the problem of multiuser detectors and adaptive multiuser receivers by using a blind adaptive equalization method. The structure of the receiver is similar to that of the adaptive MMSE receiver which consists of an adaptive equalizer and an adaptive mechanism that uses a standard least mean-squared (LMS) algorithm, but uses a matched filter to generate a reference signal. The receiver is shown to be effective in different fading channels with perfect power control and a near-far effect. Furthermore, the simulation results show that the blind MMSE receiver outperforms the conventional receiver and the RAKE receiver.

Original languageEnglish
Pages (from-to)11-29
Number of pages19
JournalWireless Personal Communications
Volume15
Issue number1
DOIs
StatePublished - Oct 2000

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