中文摘要：

针对非协作通信条件下PSK信号识别问题,提出了一种基于星座图恢复的MPSK/MDPSK信号调制方式盲识别系统。该系统不需要信号任何先验信息,星座图恢复所需的参数如载波频率、符号速率、位定时信息均从接收序列中估计得到,同时,在系统中采用相位差分的方法以消除由载波估计偏差引起的星座图扩散。提出并定义信号隶属度函数,该函数利用星座图盲聚类得到的聚类中心的数目计算隶属度来实现MPSK和MDPSK信号调制方式识别。仿真表明,在AWGN信道条件下,当SNR〉11dB时,对所有信号的识别率大于90%,对于BPSK、4PSK信号在SNR〉6dB时识别率达到100%,证明了该算法的有效性。

英文摘要：

A system for blind modulation recognition of MPSK/MDPSK signals based on constellation recovery is proposed for non-cooperative communication applications.The system requires no prior information about the signal,and such parameters as carrier frequency,symbol rate and timing information required in the procedure of constellation recovery are estimated by use of received data samples.A phase difference method is employed to eliminate the constellation diagram diffusion caused by carrier frequency estimated offset.A subordinate function which is used to calculate subordinate value by utilizing the clustering number obtained from blind clustering of the constellation diagram is also defined in this paper,and then different MPSK/MDPSK signals can be classified by using different values of the function.Under the condition of AWGN channel,simulation proves that when SNR is above 11dB,the recognition ratio is above 90% for all kinds of signals,the ratio can achieve 100% for BPSK and 4PSK signals when SNR is above 6dB,it shows the system is effective.