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本文首先应用Bessel函数,推导出模拟微波通道含有高次项的一般传输特性产生串噪声的理论公式。指出以前在工程设计中常用的串噪声计算公式,是该理论公式的特例。文中还提出了应用最小二乘原理,解析微波通道一般传输特性的高次曲线,得到了满意的结果。从而为应用该理论公式,计算传输线路的串噪声值和分析通道一般传输特性对调频多路电话信号的影响找到了一条有效的途径。
In this paper, the Bessel function is first used to derive the theoretical formula for generating string noise based on the general transmission characteristics of the high order of the microwave channel. Pointed out that in the past engineering design commonly used string noise calculation formula is a special case of the theoretical formula. In this paper, the least-squares principle is also proposed to solve the high-order curve of the general transmission characteristics of microwave channels. The satisfactory results are obtained. Thus, an effective approach is found for applying the theoretical formula, calculating the string noise value of the transmission line and analyzing the influence of the general transmission characteristics of the transmission channel on the FM multiplex telephone signal.