计算机工程与应用 ›› 2014, Vol. 50 ›› Issue (7): 41-45.

• 理论研究、研发设计 • 上一篇    下一篇

改进的高基CORDIC算法及其在FFT中的应用

王冬格,周晓方   

  1. 复旦大学 专用集成电路与系统国家重点实验室,上海 201203
  • 出版日期:2014-04-01 发布日期:2014-04-25

Modified high-radix CORDIC algorithm with its application in FFT computation

WANG Dongge, ZHOU Xiaofang   

  1. State Key Lab of ASIC and System, Fudan University, Shanghai 201203, China
  • Online:2014-04-01 Published:2014-04-25

摘要: 提出了一种改进的高基CORDIC算法,显著减少了传统CORDIC算法的迭代次数,同时保持模校正因子依然是一个常数。该算法可用于旋转角度能事先确定的场合,例如FFT计算中的旋转因子乘法。所设计的复数乘法模块采用SMIC 0.13 μm工艺综合,结果证明,提出的结构相比通用复数乘法器节约了19.2%的硬件面积和29.1%的ROM存储器面积,同时SQNR大于83 dB,满足实际应用的要求。

关键词: CORDIC算法, 模校正因子, 旋转因子乘法, 快速傅里叶变换

Abstract: A modified high-radix CORDIC algorithm is proposed, which significantly reduces iteration number of CORDIC algorithm and keeps scaling-factor as a constant. This algorithm can be applied in situations where rotation angle can be computed beforehand, such as twiddle factor multiplication of FFT(Fast Fourier Transform) computation. The designed plural-multiplication module is synthesized using the SMIC 0.13 μm process. Results proves that the proposed architecture has saved 19.2% hardware area and 29.1% ROM memory area in comparison with general-purpose plural multiplier, meanwhile it guarantees SQNR is above 83 dB which meets the practical requirement.

Key words: CORDIC algorithm, scaling-factor, twiddle factor multiplication, Fast Fourier Transform(FFT)