基于AD9361的DQPSK收发工程实现与测试

Implementation and test of DQPSK transceiver project based on ad9361

摘要:

针对 AD9361实现DQPSK收发过程中存在的工程实现问题,完成了基于SPI接口的AD9361配置,通过测试定位了：输出端无波形、接收与发射本振时域波形扭曲、输出端谐波分量严重、发射本振与接收本振存在随机相位误差四个疑难问题,采用10MHz SPI时钟、系统时钟设置为40MHz、输出端采用1.4GHz、采用点积叉积进行解调四种方法予以解决。结果表明相关问题解决效果良好,所实现的DQPSK收发性能可靠。

Abstract:

In view of the engineering implementation problems existing in the implementation of DQPSK transceiver by AD9361, the AD9361 configuration based on SPI interface is completed. Through the test, it is determined that the clock rate of SPI interface higher than 40MHz will lead to no waveform at the output end, the frequency difference of ad9361 system clock will lead to the distortion of local oscillator time domain waveform between reception and transmission, and the output balun matching frequency is 2.4GHz There are four difficult problems of random phase error between transmitting local oscillator and receiving local oscillator. They are solved by four methods: 10MHz SPI clock, 40MHz system clock, 1.4GHz output and demodulation by dot product cross product. The results show that the related problems are solved well, and the transceiver performance of DQPSK is reliable.