Study on modulation techniques free of orthogonality restriction  

作　　者：CAO QiSheng LIANG DeQun 

机构地区：[1]Department of Information Engineering, Dalian Maritime University, Dalian 116026, China

出　　处：《Science in China(Series F)》2007年第6期889-896,共8页中国科学（F辑英文版）

基　　金：the National Natural Science Foundation of China (Grant No. 60272017)

摘　　要：The Nyquist rate is a limit of transmission for traditional modulation methods from orthogonality restriction. Nonorthogonal modulation techniques （NMT） is proposed, which removes the orthogonality restriction, and as a result, higher bandwidth ef- ficiency than the traditional methods can be achieved. First, the symbol error rate of NMT is introduced by using estimation theory. Then the relation between bandwidth efficiency and signal to noise ratio is discussed. Finally, a design instance of NMT is present and numerical experiment is made. This study explores for new modulation methods and points out a widened direction for modulation theory and applications.The Nyquist rate is a limit of transmission for traditional modulation methods from orthogonality restriction. Nonorthogonal modulation techniques （NMT） is proposed, which removes the orthogonality restriction, and as a result, higher bandwidth ef- ficiency than the traditional methods can be achieved. First, the symbol error rate of NMT is introduced by using estimation theory. Then the relation between bandwidth efficiency and signal to noise ratio is discussed. Finally, a design instance of NMT is present and numerical experiment is made. This study explores for new modulation methods and points out a widened direction for modulation theory and applications.

关 键 词：digital communications Nyquist rate nonorthogonality bandwidth efficiency 

分 类 号：TN91[电子电信—通信与信息系统]