广播电视节目的重要传输手段主要包括微波、卫星、网络三大通讯。在进一步应用和推广同步数字体系数字微波传递接力系统的过程中,具有不同功率的调制设备渐渐被融入到微波通讯行业,10bit/Hz级别的频谱效率也变成了现实。在同步可复用的基础上,映射结构灵活的模式可使高阶分路与低阶分路的支路信号实现直接插接。基于设备实现简单化的结构的目的,避免逐级分、复接过程,同步数字体系系统实现了开销字节的大量开发,提高了网络整体运行的能力,不论是涉及网络操作,还是管理或维护等。人们普遍认为微波通讯中频谱的不真实是由多种路径衰减导致的,因此,采取合适的手段降低多种路径的衰减是当前需要解决的关键问题。能实现空间分集并接收与具有自动适应均衡特性的设备就可作为基本设备运用到微波通讯系统中去。下面就从所涉及的发射机、收信机及天线反馈系统入手,介绍其功能和作用。 Important means of transmission of radio and television programs include microwave, satellite, network, the three major communications. In the further application and promotion of synchronous digital system digital microwave relay system, modulating devices with different powers are gradually integrated into the microwave communication industry, and the spectral efficiency at the level of 10 bit / Hz has also become a reality. On the basis of synchronous and reusable, the flexible structure of the mapping structure can directly insert the branch signals of the high-order branch and the low-order branch. Based on the purpose of simplifying the structure of the device and avoiding the step-by-step process of multiplexing and multiplexing, the synchronous digital hierarchy realizes the large-scale development of overhead bytes and improves the overall network operation capability, whether it involves network operation, management or maintenance Wait. It is generally believed that the unrealistic spectrum in microwave communication is caused by a variety of path attenuation. Therefore, taking suitable measures to reduce the attenuation of multiple paths is the key issue that needs to be solved at present. Can achieve space diversity and receive and automatically adapt to the characteristics of the equipment can be used as a basic device to the microwave communication system. The following from the transmitter, receiver and antenna feedback system to start with its function and role.