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 More computer ebooks Networking Ultra-Wideband Communications: Fundamentals and Applications
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 Chapter 1 provides a comprehensive overview of UWB communications by covering its history and background. We discuss the concepts behind UWB communications as well as UWB's advantages and challenges. In this chapter, we explain in great detail the difference between UWB and spread-spectrum communications, and we examine the strengths and weaknesses of UWB compared to narrowband and spread-spectrum wideband communications. Chapter 1 covers the single-band and multiband approaches that are the two leading UWB techniques under consideration for IEEE standardization. This chapter also addresses current FCC and worldwide regulatory efforts for the commercialization of UWB.
Finally, the chapter concludes with a brief discussion of UWB applications.Chapter 2 concentrates on UWB pulse-generation techniques. In simple language, we introduce the concepts of pulse generation using step recovery diodes (SRDs) and drift step recovery diodes (DSRDs), as well as pulse shaping techniques. The chapter also presents a detailed discussion of UWB antenna concepts, including system and network considerations. Chapter 3 focuses on the advantages and disadvantages of several modulation/demodulation schemes used for UWB pulse detection. The modulation techniques covered are on-off keying (OOK), pulse-amplitude modulation (PAM), pulse-position modulation (PPM), bi-phase modulation, and transmitted-reference (TR) modulation. The chapter also discusses the concepts behind energy detectors and classical matched filters (CMF), which are the basis for most pulse-detection techniques. Chapter 3 further explains UWB multiple-access techniques based on each modulation technique, as well as time-hopping and delay-hopping concepts to avoid catastrophic collisions in multiuser channels. Chapter 4 examines the interference issues of UWB systems to existing narrowband and wideband radio services. Specific cases of UWB interference to IEEE 802.11a/b WLANs, GPS, and cellular phones are discussed thoroughly in terms of the UWB transmitter density that can degrade the performance of each radio service to a harmful level. Chapter 5 provides a detailed and quantitative look at some key UWB applications of widespread interest in the entertainment, military and government, as well as automotive, industries. This chapter identifies the initial, existing, and future target markets for UWB in the commercial sector and offers a full market analysis in terms of UWB speed-to-market advantages, the technology's adaptation timeline, as well as market projections and forecasts for UWB products up to the year 2010. Download free pdf ebooks of networking: Ultra-Wideband Communications: Fundamentals and Applications
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