Linear Baseband Modelling of Direct-Sequence
Code Division Multiple Access Systems
RVK'96, Swedish Radio Science and Communications
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.
which includes a derivation of the fractionally spaced DFE
at ICUPC 1996.
- Postscript (uncompressed)
Postscript (compressed, .gz) 76K
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