高集成度射频收发器的差分正交调制解调测试与工程实现  

Test and Engineering Implementation of Differential Quadrature Modulation and Demodulation for Highly Integrated RF Transceiver

作　　者：王志强 丁丹 WANG Zhiqiang;DING Dan(Department of Graduate Management,Space Engineering University,Beijing 101416,China)

机构地区：[1]航天工程大学电子与光学工程系,北京101416

出　　处：《计算机测量与控制》2022年第2期31-37,共7页Computer Measurement &Control

摘　　要：针对高集成度射频收发器(AD9361)实现差分正交调制解调(DQPSK)收发过程中存在的工程实现问题,采用理论分析与硬件平台实现相结合的方法测试AD9361,验证DQPSK调制解调;先通过Serial Peripheral Interface(SPI)接口测试AD9361自发自收,采用点积叉积方法实现了DQPSK的调制解调;配置AD9361过程中,通过测试定位初始化后AD9361输出端无波形、通过示波器观察发现AD9361发射与接收本振时域波形扭曲、频谱仪观察AD9361输出端谐波分量严重、DQPSK解调时发射本振与接收本振存在随机相位误差4个疑难问题,分别通过采用降低SPI时钟频率为10 MHz、AD9361芯片的系统时钟更改设置为40 MHz、初始化过程中输出端频率设置为1.4 GHz、DQPSK的解调采用点积叉积方式进行解调4种方法予以解决;实验结果表明4个相关问题解决效果良好,所实现的DQPSK收发性能可靠。Aiming at the engineering implementation problems in the process of differential quadrature modulation and demodulation(DQPSK)transceiver of highly integrated RF transceiver(AD9361),the method of combining theoretical analysis and hardware platform implementation is used to test AD9361 and verify DQPSK modulation and demodulation.Firstly,AD9361 is tested for sel-transmitting and receiving through the serial peripheral interface(SPI),and the modulation and demodulation of DQPSK is realized by using the dot product and cross product method.In the process of configuring AD9361,there are four difficult problems:no output waveform after test positioning initialization,time domain distorted waveform of AD9361 transmitting and receiving local oscillation(LO)observed by oscilloscope,serious harmonic component output of AD9361 observed by spectrometer,random phase error between transmitting lo and receiving LO during DQPSK demodulation,respectively by reducing SPI clock frequency to 10 MHz,the system clock of AD9361 chip is set up to 40 MHz,the output frequency is set up to 1.4 GHz during initialization,and the demodulation of DQPSK is demodulated by dot product and cross product.The experimental results show that the four related problems are solved effectively,and the implemented DQPSK transceiver performance is reliable.

关 键 词：AD9361 SPI接口 输出巴伦 DQPSK 点积叉积 

分 类 号：TN914[电子电信—通信与信息系统]