A novel adaptive channel estimation method in WCDMA system based on least squares

Author

Xiaofei Zhang ; Xu, Dazhuan ; Yang, Bei

Author_Institution

Dept. of Electron. Eng., Nanjing Univ. of Aeronaut. & Astronaut., China

Volume

1

fYear

2004

fDate

31 May-2 June 2004

Firstpage

189

Abstract

Rayleigh fading channel estimation using time multiplexed pilot symbols in WCDMA system is considered. The WCDMA uplink signal model is established. A novel adaptive channel estimation method based on least squares (ALS) is presented in this paper to meet the simultaneous needs of high speed, low speed, medium speed and varying-speed, and the weighed combination function is introduced to solve this problem. Weight factor is determined by channel changing rate or maximum Doppler frequency. The method of channel changing rate estimation is proposed in this paper, and it has many advantages such as small calculation and robust characteristic. The simulation results reveal that ALS can track and estimate channel parameter of data symbol, and the RAKE receiver with ALS method can perform well under high speed, medium speed, low mobile speed and varying-speed.

Keywords

Rayleigh channels; adaptive estimation; broadband networks; channel estimation; code division multiple access; error statistics; least squares approximations; mobile radio; radio links; radio receivers; BER; RAKE receiver; Rayleigh fading channel estimation; WCDMA uplink signal model; adaptive channel estimation method; bit error rate; channel changing rate estimation; least squares method; maximum Doppler frequency; weighed combination function; weight factor; Adaptive filters; Base stations; Channel estimation; Fading; Interpolation; Least squares approximation; Multiaccess communication; Robustness; Signal analysis; Wiener filter;

fLanguage

English

Publisher

ieee

Conference_Titel

Emerging Technologies: Frontiers of Mobile and Wireless Communication, 2004. Proceedings of the IEEE 6th Circuits and Systems Symposium on

Print_ISBN

0-7803-7938-1

Type

conf

DOI

10.1109/CASSET.2004.1322951

Filename

1322951