非相干匹配滤波算法的FPGA实现及分析

Analysis and Implementation on FPGA of Incoherent Matched Filter Algorithm

在实时扩频接收机中对码的捕获速度以及可靠性要求非常严格,文中通过对目前直扩系统中常用的捕获方法进行比较,在此基础之上介绍了一种非相干匹配滤波算法,利用现场可编程门阵列FPGA的可编程性,详细地将此算法模块化,并结合算法的优化以节省FPGA资源和提高捕获速率,最后在QuartusⅡ实现仿真验证。结果表明,该算法捕获效果良好,实现简单,满足对直扩系统的实时性及可靠性要求,随着FPGA的发展,本算法对于直扩系统具有一定的实用价值。

It is strict to require speed and reliable function of code acquisition in the realtime spread spectrum receivers. Comparing with some acquisition methods in the direct sequence spread spectrum systems, this article describes an incoherent matched filter algorithm. Tbe algorithm is implemented by using the software in the FPGA, and in combination with the optimization of algorithm, would save FPGAresources and raise the acquisition speed. The simulation result indicates that the algorithm is excellent in acquisition effect, simple in implementation, and satisfies the realtime and reliability requirements by DS systems. With the development of FPGA, the algorithm is of certain practical value for DS systems.