多点数高精度低存储的FFT处理器设计

Design of multi-point high-precision FFT processor with reduced memory

提出了一种新的基于基23算法单路径反馈流水线结构的FFT处理器。通过对数据通路的动态调整,解除了变换点数必须是8的幂次的限制,可高效实现任意2n点的FFT/IFFT变换。并将自定义浮点格式引入流水线,同时在流水线输入端添加预处理单元,在不引入过多逻辑的情况下,有效的提高了FFT的变换精度,同时存储器的使用量降低10%。

Two improvements are applied to radix 2^3 single-path delay feedback pipeline FFT processor. Data path are changed to enable the pipeline configurable so that the processor can adapt to any 2^n point FFT calculation. Custom floating format is applied to the processor. And the pre-process unit is introduced without much logic added. The precision of the processor is improved. At the same time the memory requirement is reduced by 10%. And consequently the area and power are diminished.