Since WCDMA up-link adopt the RAKE receiver using coherent detection system, the exact and Real-time channel fading estimation of the transmitted signal is needed to realize the phase correction and coherent reception.

• 由于WCDMA系统上行链路采用的是基于相干解调的RAKE接收方案，故要求对信号在多径衰落信道中所经历的衰落作出准确实时的估计，以便在RAKE接收机中实现相位纠偏和相干接收。