适用于短波跳频通信的改进型Delta-Sigma调制器  

An Improved Delta-Sigma Modulator for Short-wave Frequency Hopping Communications

作　　者：曾锦 刘太君[1] 谢晋雄 叶焱[1] 许高明[1] ZENG Jin;LIU Taijun;XIE Jinxiong;YE Yan;XU Gaoming(Faculty of Electrical Engineering and Computer Science,Ningbo University,Ningbo 315211,China;Shenzhen Academy of Inspection and Quarantine,Shenzhen 518010,China)

机构地区：[1]宁波大学信息科学与工程学院,浙江宁波315211 [2]深圳市检验检疫科学研究院,广东深圳518010

出　　处：《移动通信》2019年第1期79-84,共6页Mobile Communications

基　　金：国家自然科学基金项目(61571251;61501272);浙江省公益技术应用研究项目(2015C34004;2016C34003)

摘　　要：针对短波通信中跳频技术(FHSS)的随机性、多频率性、瞬时性等特征,提出了一种适用于短波跳频通信的Delta-Sigma调制器,并用于构建频率自适应全数字发射机。在保留低频频谱特性的情况下,将优化过的低通Delta-Sigma调制器(LPDSM)与积分反馈(CIFB)拓扑结构级联,然后利用频率转换技术(FCT)进行变频操作,并根据载波频率实时调整带通(BP)DSM的调制度,调制器产生的高频数字信号将用于驱动高效开关功放。该改进型架构已经通过电路仿真验证,并在现场可编程门阵列(FPGA)中进行了实际电路的物理实现,为实现短波全数字发射机奠定了基础。According to the characteristics of Frequency-Hopping Spread Spectrum(FHSS)in short-wave communications,such as the randomness,multi-frequency and transience,a Delta-Sigma Modulator(DSM)for short-wave frequency hopping communications is proposed and applied to build a frequency adaptive full digital transmitter.The optimized low-pass Delta-Sigma modulator(LPDSM)is cascaded with the integral feedback(CIFB)topology while preserving the low-frequency spectral characteristics.By using the frequency conversion techniques(FCT),the frequency-conversion operation is performed.The modulation-degree of the bandpass(BP)DSM is adjusted according to the carrier frequency in real time.The high frequency digital signal produced by the modulator will be used to drive a high-efficiency switching power amplifier.The improved architecture is verified by circuit simulation.The physical implementation of the circuit is completed in a fi eld programmable gate array(FPGA).This work lays a foundation to implement all-digital short-wave transmitters.

关 键 词：短波跳频通信 DELTA-SIGMA调制器 频率转换 FPGA 短波数字功放 

分 类 号：TN761[电子电信—电路与系统]