两种接收机结构的等效性证明

现行的各种通信原理教材中,最佳接收机框图里其输入端均无带通滤波器,而凡是使用低通滤波器的接收机框图里其输入端都有带通滤波器。针对学生提出的低通滤波器型接收机输入端是否一定需要带通滤波器的疑问,本文着重对无带通滤波器的低通型接收机的误码性能进行了推导,理论证明了无带通滤波器接收机结构与有带通滤波器接收机结构的等效性。

Proving the Equivalence for Two Kinds of Receiver Structures

In many textbook of communication principles,the optimum receiver structure has no bandpass filter at the input,but the receiver structure which uses lowpass filter has a bandpass filter at it＇s input.To solve the question that if the receiver structure with lowpass filter must have a bandpass filter at the input,this paper gives an emphasis on deriving the theoretical bit error rate of the receiver structure without a bandpass filter in the input.The conclusion shows that two kinds of receiver structures with or without a bandpass filter in the input are equivalent.