Channel parameter estimation in CDMA systems based on UKF
Wei Xiao · Journal of Computer Applications · 2008
The estimation of time-delay for CDMA system is a nonlinear iterative process. The Unscented Kalman Filter (UKF) does not approximate the nonlinear system with a linear model as the Extended Kalman Filter (EKF) does, so estimation of channel coefficient and time-delay in CDMA transmit channel by UKF algorithm is more accurate than EKF. Concerning the Multiple Access Interference (MAI) and near-far effect, channel coefficient and time-delay for CDMA systems were estimated with the proposed method. The simulation results indicate that UKF can restrain MAI and near-far effect, and can also estimate the wireless channel parameter effectively.