论文部分内容阅读
由于对指配声音和电视广播频道日益增长的需要,最近四十年来在提高频谱的有效利用方面作出了很大努力.除了所进行的其它工作外,这些努力产生了三种重要的频率规划方法,为了能在实践中应用这些方法,以下将进行详细的阐述和讨论.第一种方法通过规定干扰发射机之间的最小间隔距离来限制干扰.第二种方法是基于统一的传播条件和发射机特性数据的格网法,利用最佳频道配置有效地限制干扰.第三种方法是利用图解理论的基本原理,适用于实际条件下的最佳频谱利用.
Much effort has been spent on improving the efficient use of the spectrum in the last four decades, due to the growing need for the distribution of audio and television broadcast channels, and in addition to the other work that has been carried out, these efforts have produced three important methods of frequency planning , In order to be able to apply these methods in practice, the following will be described and discussed in detail.The first method is to limit the interference by specifying the minimum separation distance between interfering transmitters.The second method is based on uniform propagation conditions and emissions The grid method of machine characteristic data, using the best channel configuration to effectively limit the interference.The third method is to use the basic principles of the graph theory, suitable for the best spectrum utilization under the actual conditions.