基于CORDIC算法的高速基-4FFT处理器设计

针对目前数字信号处理中对高速傅里叶变换(FFT)的要求,进行了FFT算法研究,采用基-4算法来实现FFT处理器;设计了对称乒乓RAM结构,提高了FFT处理器的连续运算能力和运算速度;采用CORDIC算法代替复数乘法器,用移位加法实现了复数乘法运算,减小了系统资源占用,提高了系统速度,设计了防溢出控制结构,在不增加系统延时的基础上,提高了运算精度;采用AL-TERA公司FPGA进行了验证,仿真结果表明该FFT处理器最大工作频率可达168.86 MHz,能满足高速实时处理的要求。

Design of High-speed Radix-4 FFT Processor Based on CORDIC

This paper researches and designs a FFT processor radix-4 arithmetic for the requirement of the high-speed FFT processor in Digital Signal Process.The computing capacity and computing speed of FFT processor has been improved due to the Symmetrical structure of ping-pong RAM.The complex multiplier in trditional FFT precessor is substituted by the vector rotation CORDIC,the CORDIC complete a complex multiply by just shift-add operartion,So it uses less resource and reaches high speed.We increase the Computing...