Adaptive Chip-Level Channel Estimation for IMT-DS System: DL and UL

Authors:
S. Faisal Shah;Asrar U. Sheikh
Affiliations:
Department of Electrical & Computer Engineering, University of Minnesota, Minneapolis, USA 55455;Electrical Engineering Department, King Fahd University of Petroleum and Minerals Dhahran, Saudi Arabia 31261
Venue:
Wireless Personal Communications: An International Journal
Year:
2005

Citing 7
Cited 0

Adaptive signal processing

Adaptive signal processing
Adaptive filter theory (3rd ed.)

Adaptive filter theory (3rd ed.)
Statistical Digital Signal Processing and Modeling

Statistical Digital Signal Processing and Modeling
Pilot Assisted Coherent DS-CDMA Reverse-Link Communications with Optimal Robust Channel Estimation

ICASSP '97 Proceedings of the 1997 IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP '97) -Volume 1 - Volume 1
Simple MMSE equalizers for CDMA downlink to restore chip sequence: comparison to zero-forcing and RAKE

ICASSP '00 Proceedings of the Acoustics, Speech, and Signal Processing, 2000. on IEEE International Conference - Volume 05
Wideband DS-CDMA for next-generation mobile communications systems

IEEE Communications Magazine
Optimal tracking of time-varying channels: a frequency domain approach for known and new algorithms

IEEE Journal on Selected Areas in Communications

Quantified Score

Hi-index	0.00

Visualization

Abstract

In this paper, chip-level adaptive channel estimation has been explored by using LMS algorithm for wideband CDMA channel estimation. The expression for the optimum step-size is modified for fading channel estimation problem. In addition, a new method is proposed to obtain channel estimates with known pilot symbols which is found to give better results than other methods. For slow fading channels, like pedestrian channel, LMS estimator with no update mode is found to give satisfactory results. For fast fading channels, like vehicular channel, a common decision directed technique of channel estimation is modified to be used at chip-level in the downlink (DL). A novel despreader-respreader based channel estimator has been proposed to obtain uplink channel estimates at chip level which resolves the deficiencies of conventional methods. The performance of Rake receiver with proposed channel estimation schemes for IMT-DS system --- a 3G mobile communication standard --- is evaluated in terms of BER.