【摘要】 在第三代移动通信WCDMA的最新通信标准[1] 中 ,下行信道在保留时分复用导频符号的同时 ,新增了公共导频信道 .本文针对WCDMA这一最新改变 ,给出了利用公共导频信道进行信道估计 ,实现相干RAKE接收的模型算法、性能分析及仿真结果 .仿真表明 ,利用公共导频信道的RAKE接收机性能明显优于时分插入导频符号辅助的RAKE接收机的性能 ,尤其在高速及变速运动情况下 ,而且具有信道估计算法简单、信道跟踪实时性强的特点 .更多还原

【Abstract】 Updated Wideband CDMA (WCDMA) systems empoly coherent detection either by the ever existing Common Pilot Channel (CPICH),or by periodically inserting pilot symbols in the data stream.A RAKE receiver for WCDMA downlink physical channel with the channel estmation by the CPICH is presented.Analytic and simulation results show that the RAKE receiver proposed here performs better in the fast fading channels and has considerably less computational complexity than the receiver with pilot symbol aided channel estimation,especially in the high speed mobile enviornment.更多还原