UWB的调制技术及其应用前景

Modulation technology and application prospects of UWB

UWB(超宽带)技术是继CDMA技术之后迅速发展的一种宽带传输技术,将经过信息调制的基带脉冲进行直接发送,脉冲宽度一般为ns级,因此它的信号能量分布在从DC到几GHz范围。它相对常规窄带传输方式而言有低功率谱、低截获、抗干扰能力强、可高速数据传输、多径分辨能力强和共享频谱等优点。主要介绍了UWB的几种调制技术,包括:TH-PPM、DS-UWB、TH-PAM和TH-OOK。分别阐述了它们的信号调制与解调,并分析比较了它们的性能,得出TH-PPM功率效率最高,是一种最优方案,最后以一种简明方式分析了UWB的应用和未来发展前景。

UWB（Ultra wideband） is a broadband transmission technology,and rapid developed after CDMA technology.It sends base band pulse modulated by information directly.The pulse width is generally a few nanoseconds,therefore the signal energy is distributed from near DC to a few gigahertz.Compare with general narrowband transmission,UWB has many characteristics,such as low PSD,low interception,high antijam ability,high data speed,high multipath resolution capability as well as spectrum shared.This paper introduces several modulation technology of UWB,including TH-PPM,DS-UWB,TH-PAM and TH-OOK.It has made a detailed analysis about the modulation and demodulation of the above modulation technology.Compared with the other modulation technology,TH-PPM is the best one.Finally,it introduces the application and future prospects of UWB.