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一、引言多射线时变信道上,分离多径接收技术已经出现很长时间了。尤其近几年来,在对流层散射信道上分离多径技术发展是比较快的,因此从工程设计角度对分离多径技术进行定量的分析是很必要的,本文目的即在于此。分析了分离多径技术的原理及影响接收质量的因素,并且和带内分集技术进行了比较。为便于说明问题,本文是以延迟本地伪码型分离多径接收机为例进行分析的,接收机的模型是以相干检测为例给出的,当然非相干检测方式也可以应用。因为带内分集技术早已为从事对流层散射通讯的工程技术人员所熟知,因而本文分析方法是把分离多径技术等效成带内分集技术,给出分离多径接收性能估算方法。
I. INTRODUCTION Multi-ray time-varying channels have been developed for a long time. Especially in recent years, the development of RSP in the troposcatter channel is relatively fast, so it is necessary to analyze RMA quantitatively from the perspective of engineering design. The principle of ram technology and the factors that influence the receiving quality are analyzed, and compared with in-band diversity technology. In order to illustrate the problem, this paper analyzes the delay of the local pseudo-code rake receiver. The receiver model is given as an example of coherent detection, of course, the non-coherent detection method can also be applied. Because in-band diversity techniques are already well-known to those skilled in the art of tropospheric scatter communications, the analysis method in this paper is to use ramization techniques as in-band diversity techniques and to give a method for estimating rake reception performance.