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1. INTRODUCTION 3
1.1 ULTRA WIDE-BAND (UWB) 4
1.2 UWB ADVANTAGES / DISADVANTAGES 4
2. UWB SIGNALS 5
2.1 DEFINITION OF UWB SIGNAL 5
2.1.1 IN THE EUROPEAN UNION 7
2.1.2 IN ASIA 8
3. UWB MODULATION 9
3.1 INTRODUCTION 9
3.2 PULSE SHAPE 9
3.3 MODULATION SCHEMES 10
3.3.1 Pulse Amplitude Modulation (PAM) 10
3.3.2 Pulse Position Modulation (PPM) 10
4. OVERVIEW OF TRANSMITTER 11
4.1 INTRODUCTION 11
4.2 UWB BASIC ARCHITECTURE 11
4.2.1 Basic Architecture of transmitter and receiver 11
4.3 CURRENT EXISTING TECHNOLOGY 13
4.3.1 PulsOn technology 13
4.3.2 Sub-Carrier Technology 14
4.3.3 Multi-Spectral Solutions, Inc. 14
4.3.4 Xtreme-Spectrum Inc.: Trinity 14
6. REFERENCES 20
Wireless communications is one of the most active areas and also it is one of the fastest growing areas in this century. This development is being driven by the transformation of what has been largely a medium for supporting voice telephony into a medium for supporting other services, such as the transmission of video, image, text, and data. During last a decade, wireless communication technology has development rapidly, but still desired the demand for large transmission capacity, and other problem of frequency resource to maximize efficiency for confined frequency resource for wireless communication. So the demand for new wireless capacity is growing at a very rapid pace. Of course, still great many technical problems to be solving in modern wireless communication. As a result, the main focus move on transmission capacity, ultra speed, and low power to drove the cost down, and so on. To solve this problem is using by Ultra Wideband spectrum. Ultra Wideband (UWB) defined by Federal communication commission in 2002. Many bandwidth still hungry commercial spectrum for broadcasting services in VHF and UHF. The UWB spectrum within regulated spectrum is useful for communication and measurement systems begin at 3.1 GHz and ends at 10.6 GHz in the super high frequency
FCC15, "Ultra-Wideband operations FCC Report and Order," 22 April 2002.
 M. Z. W. a. R.A.Scholtz, "Impulse radio: How it works," IEEE Commun. Lett, vol. 2, pp. 36-38, 1998.
 IDA, "Singapore Ultra-Wideband Programme," IDA (Inforcomm Development Authority of Singapore), Singapore 038988, 2003.
 D. M. Kazimierz Siwiak, Ultra Wideband Radio Technology: Wiley, 2004.