DocumentCode :
2675256
Title :
Model based approach for time-varying channel estimation in DS-CDMA systems using non-isotropic scattering environment
Author :
Ahmed, Mansoor ; Khan, Noor M.
Author_Institution :
Dept. of Electron. Eng., Muhammad Ali Jinnah Univ., Islamabad, Pakistan
fYear :
2009
fDate :
19-20 Oct. 2009
Firstpage :
62
Lastpage :
65
Abstract :
This paper deals with the estimation of rapidly time varying non isotropic Rayleigh fading channels in synchronous direct sequence spread spectrum (DS-CDMA) systems. The effects of non isotropic scattering can be captured by using Von Mises distribution for the angle of arrival (AOA) of the scattered waves at the receiver. Kalman Filter based on higher order autoregressive (AR) model is used for tracking and estimation of the non isotropic Rayleigh channel. The proposed algorithm works much better than AR(1) based algorithms in tracking time varying channel especially on high Doppler spreads in directional scenarios. However, it is observed, the computational cost of the proposed algorithm increases when the AR model order increases.
Keywords :
Kalman filters; Rayleigh channels; autoregressive processes; channel estimation; code division multiple access; DS-CDMA system; Kalman filter; Von Mises distribution; angle of arrival; autoregressive model; non-isotropic scattering environment; synchronous direct sequence spread spectrum; time-varying channel estimation; time-varying non-isotropic Rayleigh fading channel; Channel estimation; Fading; Kalman filters; Multiaccess communication; Multiuser detection; Rayleigh channels; Rayleigh scattering; Spread spectrum communication; Time-varying channels; Vehicle dynamics; Autoregressive models; CDMA; Kalman filters; Non isotropic Rayleigh fading;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Emerging Technologies, 2009. ICET 2009. International Conference on
Conference_Location :
Islamabad
Print_ISBN :
978-1-4244-5630-7
Electronic_ISBN :
978-1-4244-5631-4
Type :
conf
DOI :
10.1109/ICET.2009.5353199
Filename :
5353199
Link To Document :
بازگشت