公开(公告)号：US5862455A

公开(公告)日：1999-01-19

申请号：US549790

申请日：1995-12-05

申请人： Andrew Louis Martin ,  David Lewis Beard

发明人： Andrew Louis Martin ,  David Lewis Beard

IPC分类号： G01R31/28 ,  H04B1/10 ,  H04B17/00 ,  H04B17/391 ,  H04B2/18

CPC分类号： H04B17/0085 ,  H04B17/3912

摘要： A fading simulator for generating multipath-faded test signals which have attenuation notches of precisely controllable frequency position and attenuation depth from a modulated input signal of known bandwidth. The input signal is fed to a splitter that directs two in-phase components to a first path and a second path. The input to each path is divided by a splitter into in-phase and quadrature sub-signals having a quadrature phase relationship, each sub-signal being fed to a respective inverting attenuator, the outputs of the attenuators then being combined in a combiner and the combined output being passed through a variable delay line to generate the output of the respective path. The outputs of each path are then combined in a combiner circuit to generate the multipath-faded test signal. All four inverting attenuators are preferably substantially identical to one another so that the two paths have close to identical temperature-drift and other characteristics. The attenuators and delay lines are electronically controlled in tandem, preferably using a microprocessor and stored program, to generate precision, static or dynamic, attenuation notches desired.

摘要翻译： PCT No.PCT / AU94 / 00287 Sec。 371 1995年12月5日第 102（e）日期1995年12月5日PCT 1994年5月30日PCT公布。 出版物WO94 / 29975 日期1994年12月22日一种用于产生多径衰落测试信号的衰落模拟器，其具有来自已知带宽的调制输入信号的精确可控频率位置和衰减深度的衰减陷波。 输入信号被馈送到分配器，其将两个同相分量引导到第一路径和第二路径。 每个路径的输入被分离器分成具有正交相位关系的同相和正交子信号，每个子信号被馈送到相应的反相衰减器，然后将衰减器的输出组合在组合器中，并且 组合输出通过可变延迟线以产生相应路径的输出。 然后将每个路径的输出组合在组合器电路中以产生多径衰落的测试信号。 所有四个反相衰减器优选地基本上彼此相同，使得两个路径具有接近相同的温度漂移和其它特性。 衰减器和延迟线串联电子控制，优选使用微处理器和存储的程序，以产生所需的精确度，静态或动态衰减陷波。