基于CORDIC算法的基4DIT-FFT处理器的设计

摘要

随着海洋开发和信息产业的发展,高速、大容量、高可靠性的水声通信系统成为研究热点.论述了一种用于水声通信系统中的基4DIT-FFT处理器的设计.该设计利用CORDIC算法优化蝶形运算单元,将复数乘法转换为硬件易于实现的加、减、移位运算,并通过Matlab对伸缩系数与旋转系数进行预处理,大大加快了运算速度且降低了系统复杂性.在此基础上设计了一种1024点12位的基4DIT-FFT处理器.%With the development of ocean development and information industry,the high-speed,large-capacity and high-reliability underwater acoustic communication system becomes a research hotspot. The design of a radix-4 DIT-FFT processor used in underwater acoustic communication system is discussed. The CORDIC algorithm is utilized in the design to optimize the butterfly processing unit. The complex multiplication is converted into add,subtraction and shift operations easier to implement with hardware. The telescopic coefficient and rotary coefficient are preprocessed with Matlab to accelerate the computing speed greatly and reduce system complexity. On this basis,a radix-4 DIT-FFT processor with 1024 points and 12 bits was designed.