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  • Research Article
  • Open Access

Spectrum Sharing in an ISM Band: Outage Performance of a Hybrid DS/FH Spread Spectrum System with Beamforming

  • 1,
  • 1,
  • 1Email author and
  • 1
EURASIP Journal on Advances in Signal Processing20092009:834527

  • Received: 15 February 2009
  • Accepted: 16 September 2009
  • Published:


This paper investigates spectrum sharing issues in the unlicensed industrial, scientific, and medical (ISM) bands. It presents a radio frequency measurement setup and measurement results in 2.4 GHz. It then develops an analytical model to characterize the coexistence interference in the ISM bands, based on radio frequency measurement results in the 2.4 GHz. Outage performance using the interference model is examined for a hybrid direct-sequence frequency-hopping spread spectrum system. The utilization of beamforming techniques in the system is also investigated, and a simplified beamforming model is proposed to analyze the system performance using beamforming. Numerical results show that beamforming significantly improves the system outage performance. The work presented in this paper provides a quantitative evaluation of signal outages in a spectrum sharing environment. It can be used as a tool in the development process for future dynamic spectrum access models as well as engineering designs for applications in unlicensed bands.


  • Dynamic Spectrum
  • Sharing Environment
  • Spectrum Sharing
  • Interference Model
  • Dynamic Spectrum Access

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Authors’ Affiliations

Wireless Information Systems Engineering Laboratory (WISELAB), Department of Electrical & Computer Engineering, Stevens Institute of Technology, Hoboken, NJ 07030, USA


© Hanyu Li et al. 2009

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.