Open Access

Interference Mitigation Technique for Coexistence of Pulse-Based UWB and OFDM

EURASIP Journal on Wireless Communications and Networking20082008:285683

DOI: 10.1155/2008/285683

Received: 31 May 2007

Accepted: 4 February 2008

Published: 13 February 2008

Abstract

Ultra-wideband (UWB) is a useful radio technique for sharing frequency bands between radio systems. It uses very short pulses to spread spectrum. However, there is a potential for interference between systems using the same frequency bands at close range. In some regulatory systems, interference detection and avoidance (DAA) techniques are required to prevent interference with existing radio systems. In this paper, the effect of interference on orthogonal frequency division multiplexing (OFDM) signals from pulse-based UWB is discussed, and an interference mitigation technique is proposed. This technique focuses on the pulse repetition cycle of UWB. The pulse repetition interval is set the same or half the period of the OFDM symbol excluding the guard interval to mitigate interference. These proposals are also made for direct sequence (DS)-UWB. Bit error rate (BER) performance is illustrated through both simulation and theoretical approximations.

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Authors’ Affiliations

(1)
Department of Electronics and Communications, Meiji University

Copyright

© K. Ohno and T. Ikegami. 2008

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.