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频谱是具有经济和社会价值的有限资源。为使无线电频谱得到充分有效的利用,近年来出现了许多新技术,其中包括蜂窝频率的复用、定向天线技术、现代数字调制技术等。 1.频谱利用程度的度量 频谱利用与频率带宽、几何空间以及其它潜在用户使用的时间有着密切关系。用公式表示就是U=B×S×T,其中U代表频谱利用量,B代表所使用的频率带宽,S代表几何空间,T代表时间。 为提高无线电频谱的利用效率,上述的频率、空间、时间这个三维概念在指配频率和审批设置的电台时特别重要。首先,
The spectrum is a finite resource of economic and social value. In order to make full use of the radio frequency spectrum, many new technologies have emerged in recent years, including multiplexing of cellular frequencies, directional antenna technology and modern digital modulation technology. 1. Measurement of Spectrum Utilization Spectrum utilization is closely related to frequency bandwidth, geometry space, and the time used by other potential users. U = B × S × T, where U represents the spectrum utilization, B represents the frequency bandwidth used, S represents the geometric space, and T represents the time. To improve the utilization efficiency of the radio frequency spectrum, the three-dimensional concept of frequency, space and time mentioned above is of particular importance when assigning frequencies and approving radio stations to be set up. First of all,