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Pilot-aided ML schemes for joint beamforming and channel estimation in WCDMA systems

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2 Author(s)
Mestre, X. ; Dept. of Signal Theory & Commun., Univ. Politecnica de Catalunya, Barcelona, Spain ; Fonollosa, J.R.

This paper proposes semi-blind channel estimation and interference cancellation schemes for the reception of pilot-aided signals in WCDMA systems. It is shown that the performance of classical training-based schemes is severely degraded due to the code-multiplexing (as opposed to time-multiplexing) of traffic and pilot signals. The time-dispersivity of the channel destroys the orthogonality between the traffic signal and the pilot, and consequently the traffic signal appears as a new interfering signal for the channel estimation/beamforming algorithm. In order to avoid this effect, we propose techniques that exploit both the presence of the training sequence and the structure of the traffic signal in a semi-blind fashion

Published in:

Spread Spectrum Techniques and Applications, 2000 IEEE Sixth International Symposium on  (Volume:1 )

Date of Conference:

Sep 2000