CAJ | 학술논문

　　针对数字基带信号的特点和通信系统对信号传输的要求，利用DDS数字频率合成技术进行波形设计。采用了ADI公司的AD9958芯片为核心设计实现了全数字频率合成器，构建了具备FSK调制，PSK调制及线性扫描功能的全数字通信系统。详细介绍了该通信系统的主要构成和实现全数字波形设计的软件控制方式，使其具备多种信号形式，较宽的工作频带、根据工作需要随时变换波形的功能。该系统具有可重复编程和动态重构的优点，使其易于修改，灵活可控，可适用于通信工程实践中。
　　침대수자기대신호적특점화통신계통대신호전수적요구，이용DDS수자빈솔합성기술진행파형설계。채용료ADI공사적AD9958심편위핵심설계실현료전수자빈솔합성기，구건료구비FSK조제，PSK조제급선성소묘공능적전수자통신계통。상세개소료해통신계통적주요구성화실현전수자파형설계적연건공제방식，사기구비다충신호형식，교관적공작빈대、근거공작수요수시변환파형적공능。해계통구유가중복편정화동태중구적우점，사기역우수개，령활가공，가괄용우통신공정실천중。
In consideration of the characteristics of the digital baseband signal and requirements of communication system for signal transmission,the digital frequency synthesis technique of direct digital synthesizer(DDS)is utilized for waveform de?sign. ADI's AD9958 chip is used as the core to design and achieve all?digital frequency synthesizer. A digital communication sys?tem with FSK modulation,PSK modulation and linear scan function was built. The main components of the communication sys?tem and software control mode to implement all?digital waveform design are introduced in detail,so that the communication sys?tem has a variety of signal forms,wide operating frequency band,and waveform transform functions according to its need for operation at any time. The system has the advantages of reusable programming and dynamic reconfiguration,which make the sys?tem easy to modify,flexible and controllable. It can be widely applied to communication engineering field.