To improve the ability of FFT's (Fast Fourier Transform) processing data in real time, this paper introduces a method to achieve high-speed, high-order and assembly-line FFT design based on FPGA(Field Programmable Gate Array) which has characteristic of high speed and plenty of logical sources and FFT's grading. With this method, 1024 points FFT sampled by time order has been realized by using Xilinx's Virtex_-I FPGA which has operation frequency above 50 MHz.
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