基于扩展收敛域CORDIC算法的FM信号数字化解调实现  

Digital implementation of FM demodulation based on the CORDIC algorithm with the expanded range of convergence

作　　者：何晓华[1] 谢建精[2] 郭洪志[3] 李式巨[3] 

机构地区：[1]浙江传媒学院电子信息学院,浙江杭州310018 [2]杭州电子科技大学电子信息学院,浙江杭州310018 [3]浙江大学信息与通信工程研究所,浙江杭州310027

出　　处：《电子技术应用》2010年第1期53-56,共4页Application of Electronic Technique

基　　金：通信系统信息控制技术国家重点实验室资助(2006C21009)

摘　　要：提出一种新的FM信号数字化解调实现方案。该方案在研究CORDIC算法原理和结构的基础上对其收敛域范围进行了扩展,能解调调制指数较大的宽带调频信号,适合在软件无线电中的应用。扩展收敛域CORDIC算法模块免去了传统的CORDIC算法中的预处理和后处理过程,降低了计算的复杂度和系统的硬件资源消耗。通过Matlab系统仿真和Modelsim硬件描述语言仿真,在SNR≥0dB和载波频偏△fc≤100ppm[1]的情况下,均具有较好的解调效果。A new digital implementation of frequency modulation signal（FM） demodulation was presented.h expanded the range of convergence of coordinator rotation digital computer（CORDIC） algorithm based on the study of principle and structure of traditional CORDIC algorithm.The new algorithm can be used for the demodulation on the wideband FM signal with a big modulation index. The CORDIC algorithm with the expanded range of convergence did not need the preproeess and back-process.It reduced the complexity of calculation and system hardware resource.The simulation result by Matlab and Modelsim tools indicated that it had a good demodulation effect when the signal to noise ratio（SNR） was greater than 0 dB and the carrier excursion was less than 100 ppm.

关 键 词：FM解调 扩展收敛域 CORDIC算法 软件无线电 

分 类 号：TN925[电子电信—通信与信息系统]