高速寻呼中数字滤波器的计算机辅助设计

CAD of Digital Filter in High-speed Calling

首先给出邻道辐射功率的概念 ,再推出 10阶贝塞尔模拟滤波器的电压转移函数 ,利用从模拟滤波器变换到数字滤波器的欧拉近似方法 ,将其转换为数字滤波器 ,分别对二电平和四电平寻呼编码信号 ,结合计算机进行处理 ,并设计出了硬件的具体实现过程和软件程序的流程图。应用到实际系统中 ,能很好地降低邻道辐射功率 。

Firstly,this paper gives the concept of radiant power to adjacent channel, then derives the original function of 10 order Bessel analog filter, transformates it to digital filter by Euler approximation for transformation of an analog filter to a digital filter, processes separately 2 level and 4 level paging coded signals by the aid of computer, gives the way of design for hardware and the flow chart of program. This method can efficiently lower the radiant power to adjacent channel and reduce adjacent channel interferences,when applied to practical system.