基于并行DDS的QPSK调制和宽带跳频技术

QPSK Modulation and Broadband Frequency Hopping Technology based on Parallel DDS

针对通信终端测试领域中需要产生宽带调制和跳频信号的应用需求,在并行DDS算法的基础上,合理设计软硬件架构,完成了单载波信号、QPSK调制信号和跳频信号的合成,并通过软件补偿减小实际信号的频率偏差。实验证明,该方法可以产生0~1GHz范围内的单载波信号、调制信号和跳频信号,频差比不补偿时降低一个数量级,调制信号带宽达80MHZ,跳频速率可达到4000跳每秒,信号性能符合实际需求。

Aiming at the application requirements of generating broadband modulation and frequency hopping signals in the field of communication terminal testing, the hardware and software architecture is reasonably designed on the basis of parallel DDS algorithm. The synthesis of single carrier signal, QPSK modulation signal and frequency hopping signal is completed, and the frequency deviation of actual signal is reduced by software compensation. Experiments indicate that this method can produce these single-carrier signal, modulation signal, frequency-hopping signal in the range of 0.1 GHz, and the frequency difference is reduced by one order of magnitude when the frequency difference is not compensated. The modulation signal bandwidth is up to 80 MHz, the frequency hopping rate can reach 4 000 hops per second, and the signal performance meets the actual demands.