本文主要讨论单个无线电区中无三阶互调干扰的带宽信道数下限值和用高速数字计算机计算三阶相容信道差值序列的方法。结果表明,给出的带宽信道数下限值与三阶相容性的带宽信道数最小值接近,从而,为求得三阶相容信道差值序列缩短计算时间。本文提供的信道差值序列表可使移动无线电网路设计者分配无三阶互调产物干扰的信道频率。 在多信道无线电通信系统中,如果将许多信道引进到某一无线电区内,就必须使发射机集中安放。然而发射机在同一地区的集中安放将引起各种干扰[1,2,3]。以接收机为例,当在给定的频率上接收机同时收到两个或两个以上的高电平无用信号时,便出现互调干扰。因此,在划定的无线电区内正确地选择频率使这种互调干扰减少到最低程度,是设计通信系统的一个重要问题。 This article mainly discusses the lower limit of the number of bandwidth channels without third-order intermodulation interference in a single radio zone and the method of calculating the third-order compatible channel difference sequence with a high-speed digital computer. The results show that the lower limit of the number of the given channel bandwidths is close to the minimum number of bandwidth channels of the third-order compatibility. Therefore, the computation time is shortened for obtaining the third-order channel difference sequences. The channel difference list provided in this paper allows mobile radio network designers to allocate channel frequencies that are free of third-order intermodulation products. In multi-channel radiocommunication systems, if many channels are to be introduced into a radio zone, the transmitters must be centrally located. However, centralized placement of transmitters in the same area will cause various disturbances [1,2,3]. Taking a receiver as an example, intermodulation interference occurs when a receiver receives two or more high-level unwanted signals simultaneously at a given frequency. Therefore, choosing the correct frequency within the assigned radio zone to minimize such intermodulation interference is an important issue in the design of communications systems.