CDR标准的数字调制系统研究与设计  

Research and design of digital modulation system based on CDR

作　　者：陈冬英[1] 

机构地区：[1]福州大学物理与信息工程学院,福建福州350108

出　　处：《微型机与应用》2015年第23期65-68,共4页Microcomputer & Its Applications

摘　　要：中国调频频段数字音频广播即CDR标准可提供灵活的频谱模式,本文针对其关键技术——正交频分复用的调制技术进行研究与设计。分析子载波矩阵的构造,完成OFDM符号的有效子载波设计,对FFT设计采用改进基-2蝶形降低乘法器数目,利用块浮点数计算实现高精度,采用流水线方式优化设计流程。用Verilog HDL语言实现OFDM符号生成与FFT的设计,进行FPGA综合仿真。与MATLAB仿真结果对比表明,成帧载波可实现数模同播,FFT变换准确性高,符合CDR调制系统的要求。Due to FM-China Digital Radio （CDR）can provide flexible spectrum model, the key technologies and design for orthogonal frequency division multiplexing modulation techniques are studied in this paper. Sub-carrier matrix structural is analyzed, the completion of effective OFDM symbol sub-carriers is designed. And then we use the improvement-2 butterfly transformation to cut usage of multiplier, use floating-point module to achieve high accuracy and with assembly line way to realize the optimal multiplier and adder. Finally, we implement OFDM symbol and FFT with Verilog HDL language. Compared with MATLAB analysis results, this system has low error rates, high accuracy with read quickly and framing carriers can achieve digital-analog simulcast. It meets the requirements of CDR.

关 键 词：中国调频频段 正交频分复用 子载波矩阵 改进基-2蝶形 

分 类 号：TN929[电子电信—通信与信息系统]