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在分析四相相对移相QDPSK信号调制解调原理的基础上,设计一种由FPGA实现的改进的数字化QDPSK信号调制系统,在信号的调制过程中将码元的调制波形分为稳定区和过渡区,并通过调用不同包络衰减函数的正弦函数样值序列来产生调制波形,该系统调制信号高频分量少,解码误码率较低。文中给出了数字化QDPSK调制系统的电路模型图及仿真结果。
Based on the analysis of the modulation and demodulation principle of QDPSK signal with four phases, an improved digital QDPSK signal modulation system designed by FPGA is designed. The modulation waveform of the symbol is divided into stable region and transition The modulation waveform is generated by calling the sine function sample sequence with different envelope attenuation functions. The system modulates signals with low frequency component and low decoding error rate. The circuit model and simulation results of digital QDPSK modulation system are given in this paper.