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近年来,人们普遍认识到,对于微波传播信道中的多径效应,仅仅考虑其电平衰落部分是不够的,还必须顾及频率色散部分,即通常所说的频率选择性衰落。本文提出了一个新的多径衰落中频模拟器的电路结构,其特点是电路简单,控制信号与Rummule,数学模型参数对应。文中给出了它对某典型数字微波电路出现的多径现象的实验室模拟结果,以及系统特征曲线和位定时抖动与多径衰落参数的关系。
In recent years, it has generally been recognized that it is not sufficient to consider only the level fading part of the multipath effect in the microwave propagation channel, and the frequency dispersion part, the so-called frequency selective fading, must also be taken into account. This paper presents a new multi-path fading IF simulator circuit structure, which is characterized by a simple circuit, the control signal and Rummule, corresponding to the mathematical model parameters. The paper gives the laboratory simulation result of multipath phenomenon in a typical digital microwave circuit, and the relationship between system characteristic curve, bit timing jitter and multipath fading parameters.