Uppsala universitet

Linear Baseband Modelling of Direct-Sequence Code Division Multiple Access Systems

Claes Tidestav

RVK'96, Swedish Radio Science and Communications Conference,
Luleå, Sweden, June 3-6, 1996.

Over the years, many detectors have been proposed for systems employing Code-Division Multiple Access (CDMA). Here we develop a framework for the design of such detectors, (especially multiuser detectors). We also outline such a detector, the multivariable DFE.

In this paper, the entire process of transmission and reception in a DS-CDMA system, including the spreading, is described as a tapped delay line with multiple inputs and a single output. The model is then used to design a fractionally spaced decision feedback equalizer with a single input and multiple outputs. In the proposed approach, long codes can be used and channel estimation can be performed efficiently. The suggested detector is near-far resistant. Monte Carlo simulations demonstrate the utility of the proposed approach in a heavily loaded system with and without power control where multipath is present.

Related publications:
PhD Thesis by Claes Tidestav.
Report, which includes a derivation of the fractionally spaced DFE
Conference paper at ICUPC 1996.

Pdf, 244K.

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