非正弦时域正交编码调制及其功率谱分析  

Nonsinusoidal Orthogonal Coded Modulation in Time Domain and its PSD Analysis

作　　者：王红星[1] 刘锡国[1] 刘传辉[1] 钟佩琳[1] 赵志勇[1] 

机构地区：[1]海军航空工程学院,山东烟台264001

出　　处：《无线电通信技术》2011年第2期19-22,共4页Radio Communications Technology

基　　金：山东省"泰山学者"建设工程专项经费资助项目

摘　　要：针对传统非正弦时域正交调制(Nonsinusoidal Orthogonal Modulation in Time Domain,NOTDM)系统多址复用容量有限的问题,提出一种基于正交或准正交序列的非正弦时域正交编码调制方法。给出了系统的调制模型和数学表达式,理论推导了调制信号的功率谱表达式并仿真分析了采用不同编码的调制信号的功率谱。理论和结果表明,与非正弦时域正交调制信号相比,编码调制后的信号功率谱能保持原有包络,但是会产生离散谱,提高功率谱旁瓣值.采用自相关性能好的序列进行编码可以降低离散谱的谱线。To improve the capacity of user number of traditional nonsinusoidal orthogonal modulation in time domain（NOTDM）,a novel nonsinusoidal orthogonal coded modulation scheme in time domain is proposed based on the orthogonal or quasi orthogonal sequence.The modulation model and the mathematical expression are presented,the PSD expression of the modulated signals is derived and the PSDs coded by different sequences are simulated and analyzed.The theoretical and simulated results show that the PSD of the coded signal can be kept up as the original ones,but discrete spectrum line is produced and the side lobe of the PSD is raised up.If sequence with better self correlation characteristic is used for modulation,the discrete spectrum line can be reduced.

关 键 词：非正弦时域正交调制 编码 正交序列 功率谱密度 椭圆球面波函数 

分 类 号：TN911[电子电信—通信与信息系统]