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Equalization and RAKE detection in wideband ISI channels: towards rapproachement

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2 Author(s)
Flikkema, P.G. ; Dept. of Electr. Eng., Northern Arizona Univ., Flagstaff, AZ, USA ; Kohno, R.

The maximum-likelihood (ML) detector for direct-sequence spread-spectrum signaling over ISI channels is developed for both symbol-length and long spreading sequences. The approach is based on a delay-domain orthogonal decomposition of a joint specular/diffuse dispersive multipath channel. The detector, which extends the Ungerboeck symbol-spaced structure, demonstrates the path diversity inherent in spread spectrum ML detection. The RAKE detector is shown to be the ML detector under a set of ideal conditions, one of which cannot be obtained in practice. As an intermediate result, the DS/SS decision-feedback equalizing detector is shown to be a suboptimum approximation of the ML detector

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Communications, 1999. ICC '99. 1999 IEEE International Conference on  (Volume:3 )

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