论文部分内容阅读
在数字微波传输中,大容量数字传输的需要不断增长,为此,要求有效地利用每个射频波道的带宽。为了有效地利用带宽,必须采用某种高效的载波调制。本文研究了下列三种不同的调制方法:部分响应双边带抑制载波调制(简称PRS),部分响应正交载波调制(简称QPRS),部分响应单边带调制(SSB—PRS),介绍了对这三种制度的实验及其结果,分析了这三种调制方法对信道幅频特性和信道非线性畸变的要求,比较了QPRS和SSB—PRS的优缺点,为数字微波PCM480路和960路的方案选择提供了理论和实验依据。
In digital microwave transmission, the need for large-capacity digital transmission continues to grow, and for this reason, it is required to effectively utilize the bandwidth of each radio frequency channel. In order to effectively use the bandwidth, some kind of efficient carrier modulation must be adopted. In this paper, the following three different modulation methods are studied: partial response double sideband suppressed carrier modulation (PRS), partial response orthogonal carrier modulation (QPRS) and partial response single sideband modulation (SSB-PRS) Three systems of experiments and their results, the analysis of the three modulation methods for channel amplitude-frequency characteristics and channel non-linear distortion requirements, compared the advantages and disadvantages of QPRS and SSB-PRS for digital microwave PCM480 Road and 960 Road program Choice provides a theoretical and experimental basis.