WCDMA系统中结合导频与信息码的信道估计方法

研究了快衰落环境中第三代移动通信空中接口WCDMA(FDD),基于时分复用的导频信号辅助衰落信道下的信道估计。提出了同时根据导频信号及数据信号估计信道参数的信道估计方法,该方法将信道估计分为根据导频信号和数据信号两部分进行并由其加权合并完成。计算了最小均方误差下的合并系数。仿真结果表明该方法能快速跟踪信道的衰落,有效地估计出各时隙中数据段的信道参数。利用该算法,尤其在高速运动情况下,接收机的性能可得到显著的改善。

Channel estimation based on pilot and traffic symbols in WCDMA systems

This paper studies the fast estimation of the fading channels in wideband code division multiple access (WCDMA) systems. An estimation method using jointly the pilot and data symbols in each traffic frame is proposed. The estimation is firstly performed individually for the pilot part and data part, then the two outcomes are combined with appropriate weighting factors which are so derived as to minimize the channel estimation mean square error. It is further demonstrated by simulation that the method can well track the fast fading channel and its parameters, even during the data portion of the slots, and can improve considerably the error rate performance of the receiver, especially in fast moving cases.