多径信号载波相干解调RAKE接收机

RAKE Receiver with Carrier Coherent Demodulation for Multi-Path Signals

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相干RAKE接收机(CORAKE).该CORAKE对各径信号的接收都是相干解调,三径本地载波分别与相对应的三径接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.仿真结果表明,CORAKE具有更好的接收信噪比增益.

Can not be accurately estimated,and existed in signal carriers of different paths,the Phase difference leads to significant drop of power utilization rate of multi-path signals received by conventional RAKE receiver（CLRAKE）.A new RAKE receiver（CORAKE） that can separate multi-path signals in carriers of different paths and implement carrier coherent demodulation is proposed.When received by CORAKE,signal of each path is coherently demodulated.Phase difference between the local carrier and carriers of corresponding received signals is zero,so that the defect of receiving due to the phase difference among carries can be removed.Simulation shows that the CORAKE obtains better receiving signalto-noise ratio（SNR） gain.