超窄带通信调制技术研究  

The Study of Technology about UNB Communication

作　　者：周旻[1] 王红星[1] 吴龙刚[1] 

机构地区：[1]海军航空工程学院,山东烟台264001

出　　处：《中国电子科学研究院学报》2007年第5期518-522,526,共6页Journal of China Academy of Electronics and Information Technology

基　　金：国家863项目(2006AA701424)

摘　　要：在分析超窄带通信中的关键技术一具有高频带利用率的双向编码调制方式:可变相移键控(VPSK),甚小频移键控(VMSK)的基础上重点讨论了1/2甚小频移键控(VMSK/2)调制方式的编解码原理,并给出了其频谱的数学表达式和计算机仿真频谱图。对VMSK/2信号的频谱利用率和误码率作出初步估计,给出了VMSK/2无线数字传输系统模型,并对近似零群时延滤波器进行了初步分析。Firstly, methods of biphase coded modulation with high spectral efficiency called Variable Phase Shift Keying （VPSK） and Very Minimum Shift Keying （VMSK）, which are used in UNB, are introduced in this paper. Based on that, the paper focuses on 1/2 Very Minimum Shift Keying （1/ 2VMSK）, describes the principle of code modulation, presents a mathematical expression of the spectrum of these base band signals, and shows some frequency spectrum obtained from computer simulation. The authors calculate the spectral efficiency and BER of VPSK, VMSK, and VMSK/2, give the system model of wireless digital transmission system of VMSK/2, and analyze near zero group filter.

关 键 词：超窄带 单边带抑制载波 频带利用率 双相编码调制 近似零群时延滤波器 

分 类 号：TN911[电子电信—通信与信息系统]