Designing Equalizers Based on Explicit Channel Models of DS-CDMA Systems

Claes Tidestav

IEEE International Conference on Universal Personal Communications,
Cambridge, MA, September 29 - October 2, 1996. © 1996 IEEE.

Outline:

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 derive such a detector, a multivariable DFE.

Abstract:

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 model with multiple inputs and a single output. This 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 in an efficient way. The suggested detector is near-far resistant. 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 the Swedish Radio Conference 1996.

Source:

Pdf, 310K.