Fractionally Sampled Linear Detectors for DS-CDMA

In this paper we analyze the performance of fractionally chip sampled linear multi-user detectors for Direct-Sequence CDMA communication systems. We consider a general DS-CDMA system model accounting for user asynchronism and frequency-selective propagation channels. Analysis shows that FIR linear detectors with chip rate sampling cannot perfectly recover N or more users for a system with spreading gain N in the presence of frequency selective channel dynamics or user asynchronism. Drawing inspiration from fractionally-spaced equalization, we propose the fractionally chip sampled receiver and show that a FIR linear detector may be able to perfectly recover N users.

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