FM-DCSK超宽带系统设计及其多径信道性能分析  

FM-DCSK UWB System Design and Its Performance Analysis in Multipath Channel

作　　者：李辉[1,2] 宋耀良[1] 杨余旺[1] 

机构地区：[1]南京理工大学电子工程与光电技术学院,江苏南京210094 [2]河南理工大学电气工程与自动化学院,河南焦作454010

出　　处：《南京理工大学学报》2008年第5期619-622,共4页Journal of Nanjing University of Science and Technology

摘　　要：针对现有超宽带混沌系统使用的混沌信号频谱不够平坦、不具有恒定比特能量和多址通信困难的问题,提出了频谱平坦、带宽超过1GHz、两级级联的Colpitts振荡超宽带混沌信号产生电路;构建了相应的调频差分混沌键控(FM-DCSK)超宽带系统;并从理论上分析了在多径信道下系统误码率的解析式。结果表明,该系统具有恒定比特能量,不需信道估计,接收端可以有效地获得多径分量能量同时避免码内和码间干扰。系统通过频分方式可以方便实现频分多址通信。Because of the disadvantages of the current ultra-wideband （UWB） chaotic systems such as inadequate spectrum width, variable bit energy and difficult use in multiple-access communication, a novel UWB chaotic signal generation circuit with a fiat bandwidth over 1 GHz is proposed by means of two-level cascading Colpitts circuits. A corresponding FM-DCSK（frequency modulated differential chaos shift keying） UWB system is constructed. The system＇s bit-error ratio in the muhipath channel is analyzed in theory. The results show that it has a constant bit energy and no need for channel estimation. The receiver can avoid inner-and-inter-symbol interferences, and effectively obtain multipath energy. It is suitable for frequency division multiple access communication system.

关 键 词：混沌系统 比特能量 误码率 调频差分混沌键控 超宽带 Colpitts振荡电路 

分 类 号：TN911[电子电信—通信与信息系统]