基于UKF的CDMA系统信道参数估计  

Channel parameter estimation in CDMA systems based on UKF

作　　者：张志禹[1] 肖伟[1] 

机构地区：[1]西安理工大学自动化与信息工程学院,西安710048

出　　处：《计算机应用》2008年第1期42-44,共3页journal of Computer Applications

摘　　要：CDMA系统信道时间延迟估计是一个非线性的迭代过程。UKF算法能够避免EKF由于线性化非线性系统而带来的误差过大等问题,比EKF估计的更加精确。利用UKF算法对CDMA系统信道的幅度衰减参数与延时参数进行了估计。在研究中考虑到了多址干扰和远近效应对信道参数的影响,仿真结果表明UKF算法能有效地抑制远近效应及多址干扰,估计出无线信道参数。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.

关 键 词：UKF 信道参数估计 DS/CDMA通信系统 

分 类 号：TN929.533[电子电信—通信与信息系统]