多径信号载波相干解调RAKE接收机

传统RAKE接收机(CLRAKE)由于不同路径载波之间存在无法准确估计的相位差，将会导致多径信号的功率利用率大幅下降。针对这一缺陷，提出一种在载波上实现多径分离, 并分别对多径信号实现载波相干解调的新型RAKE接收机（CORAKE）。该CORAKE对各径信号的接收都是相干解调的，三径本地载波分别与相对应的三径收信号载波相位差均为0，消除了各径载波间的相位差对接收性能的影响。通过仿真对比，验证了CORAKE具有更好的接收信噪比增益。

RAKE Receiver with Carrier Coherent Demodulation for Multi-Path Signals

Phase difference that can not be accurately estimated exists in signal carriers of different paths, which will lead to significant drop of power utilization rate of multi-path signals received by conventional RAKE receiver(CLRAKE). In response to this defect, a new RAKE receiver (CORAKE) that can carry out the separation of multi-path signals in carriers of different paths and implement carrier coherent demodulation was put forward in this paper. When received by CORAKE, signal of each path is coherently demodulated. Phase difference between local carrier and carrier of corresponding received signal is zero, so that the defect of receiving performance brought by phase difference among carries can be removed. And computer simulation validated that CORAKE obtains better receiving SNR gain.