DocumentCode :
3481553
Title :
Multistage estimation of time-varying wireless channel parameters
Author :
Bastug, A. ; Slock, Dirk T M
Author_Institution :
Philips Semicond., Sophia Antipolis, France
fYear :
2004
fDate :
28-30 April 2004
Firstpage :
204
Lastpage :
207
Abstract :
Estimation of time-varying channel parameters in the existence of aperiodic codes (UMTS FDD mode downlink) is considered. In the first stage, a coarse FIR channel estimate is obtained in every slot via the pilot channel. In the second stage, the estimate is improved by Wiener filtering across slots, modeling the channel parameters as first order autoregressive processes with a bandwidth commensurate with the Doppler spread. This operation performs the optimal compromise between temporal decorrelation due to Doppler spread and slot-wise estimation error and it can be realized by RLS adaptive filtering. In the third stage, exploiting the finite bandwidth of the pulse shape, the refined FIR channel estimate is approximated to a sparse multipath model for the discrete Rake receiver.
Keywords :
3G mobile communication; FIR filters; Wiener filters; adaptive filters; autoregressive processes; channel estimation; decorrelation; frequency division multiplexing; least squares approximations; multipath channels; radio receivers; recursive estimation; time-varying channels; Doppler spread; RLS adaptive filtering; UMTS FDD mode downlink; Wiener filtering; aperiodic codes; coarse FIR channel estimate; discrete Rake receiver; finite bandwidth; first order autoregressive processes; multistage estimation; pulse shape; slot-wise estimation error; sparse multipath model; temporal decorrelation; time-varying channel parameters; wireless channel parameters; 3G mobile communication; Autoregressive processes; Bandwidth; Decorrelation; Downlink; Estimation error; Finite impulse response filter; Parameter estimation; Time-varying channels; Wiener filter;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Signal Processing and Communications Applications Conference, 2004. Proceedings of the IEEE 12th
Print_ISBN :
0-7803-8318-4
Type :
conf
DOI :
10.1109/SIU.2004.1338294
Filename :
1338294
Link To Document :
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