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Sensors 2015, 15(5), 10891-10908; doi:10.3390/s150510891

Resource-Efficient Fusion with Pre-Compensated Transmissions for Cooperative Spectrum Sensing

National Institute of Telecommunications—Inatel, Av. João de Camargo, 510, 37540-000 Santa Rita do Sapucaí, Brazil
University of Hull, Cottingham Road, Hull HU6 7RX, UK
Author to whom correspondence should be addressed.
Academic Editor: Leonhard M. Reindl
Received: 3 April 2015 / Revised: 30 April 2015 / Accepted: 4 May 2015 / Published: 8 May 2015
(This article belongs to the Section Sensor Networks)
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Recently, a novel fusion scheme for cooperative spectrum sensing was proposed for saving resources in the control channel. Secondary users (SUs) simultaneously report their decisions using binary modulations with the same carrier frequencies. The transmitted symbols add incoherently at the fusion centre (FC), leading to a larger set of symbols in which a subset is associated with the presence of the primary user (PU) signal, and another subset is associated with the absence of such a signal. The decision criterion applied for discriminating these subsets works under the assumption that the channel gains are known at the FC. In this paper, we propose a new simultaneous transmission and decision scheme in which the task of channel estimation is shifted from the FC to the SUs, without the need for feeding-back of the estimates to the FC. The estimates are used at the SUs to pre-compensate for the reporting channel phase rotations and to partially compensate for the channel gains. This partial compensation is the result of signal clipping for peak-to-average power ratio (PAPR) control. We show, analytically and with simulations, that this new scheme can produce large performance improvements, yet reduces the implementation complexity when compared with the original one. View Full-Text
Keywords: cognitive radio; cooperative spectrum sensing; decision fusion; channel inversion; crest factor; clipping cognitive radio; cooperative spectrum sensing; decision fusion; channel inversion; crest factor; clipping

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. (CC BY 4.0).

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MDPI and ACS Style

Guimarães, D.A.; Aquino, G.P.; Cattaneo, M.E.G.V. Resource-Efficient Fusion with Pre-Compensated Transmissions for Cooperative Spectrum Sensing. Sensors 2015, 15, 10891-10908.

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