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由于目前CDMA快速码捕获系统对捕获速度的要求越来越高,而目前使用比较普遍的码捕获方法是基于FFT的快速码捕获。因此开发出一种快速简单实用的FFT计算方法势在必行。基于Cooley-Tukey提出的算法,实现了一种基-4FFT的FPGA设计方法。利用FPGA的丰富资源以及灵活的IPCore功能,使设计流程大大简化,为实现FFT算法提供了一种方便快捷的方法。仿真和实验结果证明,该方法准确可靠,计算速度快,相比于以前的算法,该方法提高了至少一倍的运算速度。
At present, CDMA fast code capture system has higher and higher requirements on capture speed, and the code capture method currently used is a fast code capture based on FFT. Therefore, it is imperative to develop a fast and simple FFT calculation method. Based on the algorithm proposed by Cooley-Tukey, a FPGA design method of base-4FFT is implemented. The FPGA’s rich resources and flexible IPCore capabilities greatly simplify the design flow and provide a quick and easy way to implement FFT algorithms. Simulation and experimental results show that the proposed method is accurate and reliable, and its computational speed is fast. Compared with the previous algorithms, this method improves the computational speed at least one time.