一种基于CORDIC算法的数字鉴频方法

A Digital Frequency Discrimination Technique Based on CORDIC Algorithm

本文提出了一种基于CORDIC (Coordinate Rotation Digital Computer)算法的数字鉴频方法。首先给出了基于CORDIC算法的鉴相原理,讨论了CORDIC算法的鉴相范围;然后讨论了差分鉴频的方法,特别是对低数据率情况下的差分鉴频进行了探讨,并给出了一种实用的数字鉴频结构。计算机仿真结果和FPGA仿真结果表明,基于CORDIC算法流水结构和一阶差分结构实现的数字鉴频方法是可行的,而且是高效的。

This paper puts forward a digital frequency discrimination technique based on CORDIC algorithm. Firstly, phase detection theory based on CORDIC algorithm is presented, and the corresponding phase detection range is discussed. Then the differential frequency discrimination method, especially at slow data rates, is discussed while a practical structures of differential frequency discrimination is given. The computer simulation results and FPGA implementation simulations indicate that it is feasible and highly effective to implement digital frequency discrimination technique through pipe-line structure of CORDIC algorithm and first-order differential structure.