通用零中频构架的CPM射频调制系统的设计  

A CPM RF modulation system design based on a general zero intermediate frequency architecture

作　　者：陈长龙 王竹刚 CHEN Chang-long;WANG Zhu-gang(National Space Science Center,CAS,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院国家空间科学中心,北京100190 [2]中国科学院大学,北京100049

出　　处：《微电子学与计算机》2020年第12期12-16,共5页Microelectronics & Computer

基　　金：中国科学院战略性先导科技专项(XDA15350103)。

摘　　要：连续相位调制(CPM)由于其高频谱效率而被广泛应用于数字通信系统.根据调制参数的不同,连续相位调制对应一大类调制方式.针对射频调制系统实现复杂,可移植性差的问题,设计了一种基于AD9364射频捷变收发器的通用CPM射频调制系统.首先根据CPM信号表达式完成基带信号调制设计,包括累加相位单元和相关相位单元;再通过AD9364直接上变频,完成包括插值滤波、频谱搬移等一系列转换过程.最后经测试验证,所设计的CPM射频调制系统频谱利用率高,复杂度低,且具有较好的通用性.Continuous phase modulation(CPM)is widely used in digital communication systems due to its high spectral efficiency.According to the different modulation parameters,continuous phase modulation corresponds to a large class of modulation methods.A general CPM RF modulation system based on AD9364 RF transceiver chip was designed to solve the problems of complexity-implementation and poor portability.Firstly,the modulation design of baseband signal is completed according to CPM signal expression,including accumulated phase unit and related phase unit.Then,a series of conversion processes including interpolation filter and spectrum shift are completed through AD9364 direct up-conversion.Finally,test result shows that the CPM RF modulation system has high spectrum utilization,low complexity and good generality.

关 键 词：连续相位调制 零中频 多调制指数 Tier II 基带调制 AD9364 射频调制 FPGA 

分 类 号：TN914.3[电子电信—通信与信息系统]