CDMA扩频信号的数模混合型解扩方法

A Mixed Analog-Digital Algorithm of Despreading for CDMA Spread-Signals

提出一种CDMA扩频信号的数模混合型解扩方法。该方法首先采用二阶采样实现中频信号的正交解调,再用数字控制的并行模拟运算电路实现的模拟匹配滤波器对基带信号进行相关解扩。仿真实验表明,该方法能实现CDMA扩频信号的相关解扩,而且实现电路结构简单,是一种有效的相关解扩技术。

In this paper, a new mixed analog-digital algorithm of despreading for CDMA signals is described. First, the IF signal is directly sampled and held with the second order sampling method to implement the quadrature demodulation, and then is despread by matched filters implemented by digital-controlled analog parallel operational circuits. Simulation experiment results show that this method can realize not only the efficient correlation dispreading of CDMA spread-signals, but also the simplification of circuit structure. Accordingly, it is a kind of effective correlation despreading technique.