基于广义S变换的时相调制时频聚集性能优化  

Time-Frequency Concentration Enhancement for Time-Phase Modulation Based on Generalized S Transform

作　　者：迟华山[1,2] 王红星[1] 张敏[2] 赵培洪[1] 

机构地区：[1]海军航空工程学院电子信息工程系,山东烟台264001 [2]清华大学电子工程系,北京100084

出　　处：《北京邮电大学学报》2012年第1期125-128,共4页Journal of Beijing University of Posts and Telecommunications

基　　金：国家自然科学基金项目(60772056)

摘　　要：为了提高时相调制(TPM)信号S变换的时频聚集性能,将广义S变换(GST)应用于TPM信号的时频分析中.GST在标准S变换窗函数的基础上,增加了可控参量,利用优化新增参量的算法,优化时频域各频率点处的时窗宽度,从而达到提高时频聚集性能的目的.仿真结果表明,广义S变换方法与标准S变换相比,能有效提高TPM信号的时频聚集性能,同时保持了TPM信号用于携带信息相位突变的特性,有利于下一步的信号检测.To improve the time-frequency concentration of the S-transform（ST） for the time-phase modulation（TPM）,the generalized S-transform（GST） was adopted to the analysis of the TPM signal.Based on the window function of ST,a controllable parameter was added in the window function of GST.The window width for each frequency was optimized through the optimization of the added parameter and the time-frequency concentration was enhanced.The simulation shows that the GST approach can enhance the time-frequency concentration of the TPM signal in comparison to the standard ST,and the phase jump character of the TPM signal is retained which is helpful to the next processing of the signal detection.

关 键 词：S变换 广义S变换 时相调制 时频分布 时频聚集性 

分 类 号：TN911.3[电子电信—通信与信息系统]