For a description of the radix-4 fft, some good articles, we look at

fft—4\基于FPGA的基_4FFT算法的硬件实现.pdf
......\高性能基4快速傅里叶变换处理器的设计.pdf
......\16点基4_FFT芯片设计技术研究.pdf
......\基4时抽FFT算法地址产生方法的研究及其工程实现.pdf
......\64点基_4FFT_IFFT的FPGA实现.pdf
fft—4

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