NDLI: Evaluation of Spectrum Occupancy in Indoor and Outdoor Scenario in the Context of Cognitive Radio

Content Provider	IEEE Xplore Digital Library
Author	Wellens, Matthias Wu, Jin Mahonen, Petri
Copyright Year	2007
Description	Author affiliation: Department of Wireless Networks, RWTH Aachen University, Kackertstrasse 9, D-52072 Aachen, Germany, Email: mwe@mobnets.rwth-aachen.de (Wellens, Matthias) \|\| Department of Wireless Networks, RWTH Aachen University, Kackertstrasse 9, D-52072 Aachen, Germany, Email: pma@mobnets.rwth-aachen.de (Mahonen, Petri) \|\| Department of Wireless Networks, RWTH Aachen University, Kackertstrasse 9, D-52072 Aachen, Germany, Email: wuj@mobnets.rwth-aachen.de (Wu, Jin)
Abstract	Dynamic spectrum access is an integral part of the Cognitive Radio paradigm. However, efficient spectrum sensing techniques are crucial on the way towards systems, which use idle spectrum bands opportunistically and increase the overall spectral efficiency. Current spectrum occupancy was evaluated in few measurement campaigns at different locations mostly located in the USA. In this paper we report about an extensive measurement campaign conducted in Aachen, Germany, comparing indoor-and outdoor measurement results. The highly sensitive measurement system enabled us to measure also man-made or ambient noise. Since an energy detector cannot differentiate such noise from other primary user signals we determine a very high spectrum occupancy in the outdoor scenario in the band from 20 MHz up to 3 GHz. Considerably less occupation was measured in the indoor scenario also because of less ambient noise. Our measurements confirm that the spectrum band 3-6 GHz is rarely occupied. We further provide a case study how the amplitude probability distribution can be used together with detailed regulatory information to infer additional information about the spectral usage. Such information is beneficial in order to optimize the spectrum sensing process and identify candidate bands for further investigation and possible secondary usage.
Starting Page	420
Ending Page	427
File Size	9729051
Page Count	8
File Format	PDF
ISBN	9781424408146
DOI	10.1109/CROWNCOM.2007.4549835
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-08-01
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Wireless networks Current measurement Detectors White spaces Probability distribution Time measurement Frequency measurement Cognitive radio Noise measurement Radio spectrum management
Content Type	Text
Resource Type	Article

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