一种宽带扩频信号数字调制器的设计与实现  

Design and Implementation of a Digital Modulator of Broadband Spread Spectrum Signal

作　　者：王丽韫[1] WANG Liyun(The 54th Research Institute of CETC,Shijiazhuang 050081,China)

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081

出　　处：《无线电工程》2021年第3期243-247,共5页Radio Engineering

基　　金：国家部委基金资助项目。

摘　　要：针对无人机数据链系统中下行宽带信号的隐蔽性和抗截获性不足的问题,提出宽带多进制正交扩频方案,结合宽带多进制正交扩频调制器的要求,设计了基于多相结构的FIR成形滤波器及高中频数字调制器。阐述了成形滤波的基本原理,高速FIR成形滤波器的多相结构,运用Matlab和Quartus Ⅱ软件设计了多相成形滤波器,并且采用并行直接数字频率合成(Direct Digital Synthesis,DDS)和高速DA实现了宽带扩频数据高中频数字调制。结果表明,采用该设计方法的调制器具有良好的频谱特性。For the UAV data link system,the security and anti-detection performance of down-link wideband signal is poor.A scheme of broadband M-ary orthogonal code spread spectrum communication is proposed,so as to meet the requirements of modulator of wideband M-ary orthogonal code spread spectrum communication.The FIR shaping filter based on polyphase structure and the high mid-frequency digital modulator are designed.The principle of shaping filter and the polyphase structure of FIR shaping filter for high speed data are introduced.The shaping filter on the basis of the polyphase structure is designed with Quartus II and Matlab software,and high mid-frequency digital modulation is implemented with parallel-DDS and high speed DA.The results indicate that the modulator with this design method has good quality of frequency spectrum.

关 键 词：宽带扩频 成形滤波器 多相结构 并行直接数字频率合成 高中频数字调制 

分 类 号：TN914[电子电信—通信与信息系统]