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3 - Impulse radio overlay in UWB communications

from Part II - UWB communications

Published online by Cambridge University Press:  27 May 2010

Jiangzhou Wang
Jiangzhou Wang
Affiliation:
University of Kent, Canterbury
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Summary

Interference suppression is important to allow UWB devices to operate over the spectrum occupied by narrowband systems. In this chapter, the use of a notch filter in TH-IR for UWB communication is considered, where a Gaussian monopulse is employed with pulse position modulation (PPM). A lognormal fading channel is assumed and a complete analytical framework is provided for performance evaluation using a transversal-type notch filter to reject narrowband interference. A closed-form expression of BER is derived, and the numerical results show that the use of a notch filter can significantly improve system performance. Furthermore, a performance comparison between TH-IR and multicarrier CDMA UWB systems is also made for the same transmit power, the same data rate and the same bandwidth. It is shown that, in the presence of narrowband interference, the TH-IR system with a notch filter can achieve a performance similar to multicarrier CDMA.

Introduction

Over the last decade, there has been a great interest in ultra-wideband (UWB) time-hopping (TH) impulse radio (IR) communication systems [1–8]. These systems make use of ultra-short duration pulses (monocycles), which yield ultra-wide bandwidth signals characterized by extremely low power densities. UWB systems are particularly promising for short-range high-speed wireless communications as they potentially combine reduced complexity with low power consumption, low probability of intercept, high accuracy positioning and immunity to multipath fading due to discontinuous transmission.

Type
Chapter
Information
High-Speed Wireless Communications
Ultra-wideband, 3G Long Term Evolution, and 4G Mobile Systems
 , pp. 68 - 91
Publisher: Cambridge University Press
Print publication year: 2008

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