Servicio de Información Comunitario sobre Investigación y Desarrollo - CORDIS

Development of joint multipath-doppler chip equalisation receiver for WCDMA downlink

Assessment of system performance in realistic terrestrial propagation scenarios requires the consideration of the effects of mobility. Doppler spreading can lead to severe degradation is system performance.

A chip-level equalisation receiver based on linear interpolation between tap coefficients was proposed under FLOWS as a simple way of combatting Doppler spread on the WCDMA downlink. Joint multipath-Doppler (2D) matched filtering was proposed in another source as a simple method for combining signal energy dispersed in both multipath (delay) and Doppler domains. Under FLOWS, the technique was applied to the WCDMA downlink, using 2D channel estimation employing UMTS-standards common pilot sequences and 2D MMSE chip equalisation to suppress multi-user interference. Spectral-domain processing was applied to the functional steps to reduce computational complexity and enhance multi-standard friendliness.

FLOWS has demonstrated that joint multipath-Doppler equalisation can provide significant performance benefits compared to multipath equalisation alone, for fast fading channels corresponding to, for example, a user terminal on a high-speed train. Further, some multi-user interference suppression can still be achieved over the equivalent 2D RAKE receiver.

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University of York
Heslington -
YO1 5DD York
United Kingdom
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