数字调相信号识别研究与实现

Study and Implementation of PSK Signal Recognition

通过提取数字调相信号的特征,实现对不同数字调相信号的识别。由于已调信号的初相反映了不同调相信号的特征,提出从瞬时相位中提取初相参数实现数字调相信号识别的基本方法,用去折叠相位直方图和玫瑰图,识别BPSK.QPSK/OQPSK.UQPSK这4种数字调相信号,并用Matlab进行仿真,结果表明2种方法均能实现BPSK,QPSK/OQPSK,UQPSK识别,且玫瑰图法是一种更为有效的识别方法。采用统计相邻码元的相位值的方法进一步区分QPSK和OQPSK。

The recognition of different PSK signals is carried out through extracting the characteristic of PSK signals. Because the initial phase of modulated signal reflects the characteristic of different PSK signals, the PSK signals recognition method through extracting the initial parameter from instantaneous phase is given. The methods of un-collapsed phase histogram and rose graph are used to recognize the four kinds of PSK signals： BPSK, QPSK, OQPSK and UQPSK. The simulation using Matlab are carried out and the results prove that two methods both can recognize the four different signals： BPSK, QPSK, OQPSK and UQPSK, and the rose graphic method is proved to be more effective. In addition, the method of statistical adjacent code phase is used to identify the signal of QPSK and OQPSK farther.