Results 271 to 280 of about 575,267 (307)

Throughput of primary user with cognitive radio function

2014 14th International Symposium on Communications and Information Technologies (ISCIT), 2014
In this paper, we consider a primary user equipped with a cognitive-enabled radio device and further equipped with an energy harvester with a finite capacity battery. The primary user has highest priority to access a primary channel whereas at the same time tunes the cognitive radio to sense and access to another primary channel if more throughput is ...
Thanh Tung Nguyen, Insoo Koo
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Localization of Primary Users by Exploiting Distance Separation Between Secondary Users

2015
Accurate localization of Primary Users (PUs) is an extremely useful procedure which can improve the performance of Cognitive Radio (CR) by more efficient dynamic allocation of channels and transmit powers for unlicensed users. In this paper, we analyze the performance of a Compressive Sensing (CS) method which simultaneously yields the PU transmitter ...
Audri Biswas, Sam Reisenfeld, Mark Hedley, Zhuo Chen 0001, Peng Cheng 0002   +4 more
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Spectrum reuse at the border of a primary user cell

IEEE Transactions on Communications, 2009
Most algorithms for secondary spectrum usage are solely based on signal detection. The frequencies where the primary signal is detected with level comparable to the noise are considered occupied. As a result vast areas in the proximity of primary cells become illegal for spectrum reuse.
Ruttik Kalle, Jäntti Riku, Koufos Konstantinos   +2 more
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Cognitive Relaying With Wireless Powered Primary User

IEEE Transactions on Communications, 2019
Integrating energy harvesting into cognitive radio networks can promisingly sustain the operations of energy-limited terminals and improve the spectral efficiency. Traditionally, secondary users (SUs) are normally assumed to harvest energy from the transmissions of primary users (PUs).
Chao Zhai 0001, He Henry Chen, Zhiyuan Yu 0002, Ju Liu   +3 more
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Primary users identification in underlay cognitive radio

2016 13th International Multi-Conference on Systems, Signals & Devices (SSD), 2016
In this paper, we consider an underlay cognitive radio system where secondary users can coexist with primary users in the same spectrum and region. To guarantee no interference to the primary network, the secondary base station (BS-S) needs to identify the active primary users (PUs) and to have a perfect or partial knowledge of the PU channels.
Imen Sahnoun, Inès Kammoun 0001, Mohamed Siala 0001   +2 more
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Blind Localization of Primary Users with Sectorial Antennas

2018 IEEE International Conference on Communications Workshops (ICC Workshops), 2018
It is essential to estimate the position of primary users (PUs) for the further development of cognitive radio (CR) networks. Great efforts have been done to seek for localization algorithms with high performance but low computation. In a CR network, PUs do not cooperate with secondary users (SUs), which makes localization challenging.
Zhuyin Li, Kagiso Magowe, Andrea Giorgetti, Kandeepan Sithamparanathan   +3 more
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Dynamic Spectrum Sharing with Multiple Primary and Secondary Users

2010 IEEE International Conference on Communications, 2010
Dynamic spectrum sharing in cognitive radio networks can enhance flexibility, and as a result the efficiency of spectrum usage. In this paper, we address the problem of spectrum sharing in a cognitive radio network where multiple primary and secondary strategic-users are involved.
Peng Lin 0003, Juncheng Jia, Qian Zhang 0001, Mounir Hamdi   +3 more
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Sub-Noise Primary User Detection by Cross-Correlation

2009 IEEE International Conference on Communications, 2009
In this paper we propose a combined signaling and spectrum sensing scheme for cognitive radio that can detect in-band primary users while the networks own signal is active. The signaling scheme uses OFDM with phase shift keying modulated sub-carriers, and the detection scheme measures the deviation of each sub-carrier from a circular shape.
Heskamp, M., Slump, Cornelis H.
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DSCA: Dynamic Spectrum Co-Access Between the Primary Users and the Secondary Users

IEEE Transactions on Vehicular Technology, 2015
In the current architecture of dynamic spectrum access , secondary users (SUs) only opportunistically access the spectrum of primary users (PUs). The resurgence of PUs disrupts secondary communications, which can result in poor performance for SUs. In this paper, we propose a novel architecture for dynamic spectrum access, termed dynamic spectrum
Jonathan D. Backens, Chundheng Xin, Min Song 0002, Changlong Chen   +3 more
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Analysis of a multi-user cognitive radio network considering primary users return

Computers & Electrical Engineering, 2016
A complete distributed single-channel multi-user cognitive radio network with a common control channel is analyzed. To derive the necessary metrics, we exploit renewal reward theory by which we are able to carry out a continuous time analysis of the whole network.
Mohammad Reza Amini, Mehdi Mahdavi, Mohammad Javad Omidi   +2 more
openaire   +1 more source