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International Journal of Antennas and Propagation
Volume 2015 (2015), Article ID 985892, 11 pages
http://dx.doi.org/10.1155/2015/985892
Research Article

Measurement of Coherence Bandwidth in UHF Radio Channels for Narrowband Networks

Faculty of Electronics, Telecommunications and Informatics, Gdańsk University of Technology, Narutowicza 11/12, 80-233 Gdansk, Poland

Received 31 January 2015; Revised 21 April 2015; Accepted 21 April 2015

Academic Editor: Francisco Falcone

Copyright © 2015 Jaroslaw Sadowski. 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.

Abstract

This paper presents results of investigation on the coherence bandwidth of narrowband radio channels in 430 MHz band. The coherence bandwidth values were estimated from a power delay profile obtained by recording CDMA2000 forward channel signals during real-field measurements in various environments: medium city, flat terrain, and hilly terrain in northern Poland. The results of measurements are compared with characteristic parameters of UHF radio channel models defined for exemplary narrowband digital system from the TETRA standard. In all of the tested environments, the coherence bandwidth values during most of an observation time were much higher than 25 kHz. Therefore, the fading in tested UHF narrowband channels should be classified as flat fading.