Performance Analysis of Phasor Estimation Algorithms for a FDD-UMTS RAKE Receiver

The performances of phasor estimation algorithms for the UMTS RAKE Receiver are analysed. Due to the need of covering a wide range of possible mobile speeds and spreading factors, two different algorithms are considered here, namely a LMS-Kalman type algorithm, and a Wiener filter. The Wiener filter is considered both, as a predictor and a smother. It is shown that the simpler LMS-Kalman predictor is particularly suited for low mobile speeds and low spreading factors, whereas higher speeds and/or higher spreading factors require the usage of the more complex Wiener filter. Furthermore, the very high spreading factors (128-512) require the usage of the Common Pilot Channel in order to facilitate smoothing instead of predic-