声光自适应信号处理技术在扩频通信中的应用

研究了声光滤波的工作原理,用布拉格器件作模拟抽头延迟线完成横向滤波。讨论了LMS自适应滤波的基本方法,给出了声光自适应LMS滤波的实现方法并用于扩频通信的窄带干扰抑制中。对扩频通信进行干扰抑制的滤波过程通常是一个自适应过程,采用声光自适应滤波技术,不仅能抑制窄带干扰,而且能提高系统的处理增益和分辨率。

Acousto-optic adaptive signal processing techniques for spread spectrum communication applications

The principle of the acousto-optic (AO) filtering operations was studied. The Bragg cell was utilized as an analog tapped delay line to implement the transversal filtering operations. The method of least mean square (LMS) adaptive filtering was described. The AO adaptive filter based on LMS was presented and utilized to reject narrowband interference (NBI) in spread spectrum (SS) communications. The filtering operation of NBI in SS is generally an adaptive processing. Adopting AO adaptive filtering techniques not only can reject NBI, but also can improve the processing gain, sensitivity and resolution of the system.