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Improved Transmission Strategies for Cognitive Radio Under the Coexistence Constraint
2012
IEEE Transactions on Wireless Communications
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We consider the interference-mitigation based cognitive radio where the primary and secondary users can coexist at the same time and frequency bands, under the constraint that the rate of the primary user ...
To meet such a coexistence constraint, the relaying from the secondary user (SU) can help the PU's transmission under the interference from the SU. ...
ACKNOWLEDGEMENTS The authors would like to thank the reviewers and the Associate Editor for their suggestions that greatly improved the paper in readability. ...
doi:10.1109/twc.2012.092712.120005
fatcat:2vt5svbflrdhjcpe33urlfjdj4
Game theoretic downlink resource scheduling for self-coexisting cognitive radio networks
2016
2016 International Conference on Networking Systems and Security (NSysS)
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Cognitive Radio Networks (CRNs) provide a convenient way to access under-utilized TV bands for wireless radio users. ...
In this paper, we propose a fully distributed non-cooperative game theoretic scheme for resource scheduling in self-coexisting cognitive radio networks. ...
INTRODUCTION Cognitive Radio (CR) [1] is a cutting edge technology to increase efficient spectrum utilization between many radio users. ...
doi:10.1109/nsyss.2016.7400697
dblp:conf/nsyss/SakinR16
fatcat:4dflltsahrayzgkojmowflgxiy
Distributed QoS Constraint based Resource Adaptation Strategy for Cognitive Radio Networks
2018
International Journal of Advanced Computer Science and Applications
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This paper primarily investigates and addresses the optimal power adaptation strategy problem for multi-user cognitive radio network. ...
Subsequently, the solution has been used to dynamically adjust the radio power of the SUs to conform with the stringent network constraint and ensures coexistence amongst the users. ...
The author is grateful to the DSR for their technical and financial support. ...
doi:10.14569/ijacsa.2018.090429
fatcat:aeucprcspnhrfeeze2tjo4szsu
Cognitive Radio Protocols Based on Exploiting Hybrid ARQ Retransmissions
2010
IEEE Transactions on Wireless Communications
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This paper addresses user coexistence in cognitive radio systems by taking advantage of opportunities that arise during ARQ retransmission. ...
The protocols are further extended to the scenario where multiple cognitive receivers exist. Performance analysis of the protocols is presented and their effectiveness is verified via simulations. ...
For details and comparisons between different coding strategies for the cognitive radio channel see [7] . ...
doi:10.1109/twc.2010.062910.091162
fatcat:byxgc76hqveg5fbrkthpfzdsjy
Power Control for Cognitive Radio Networks under Imperfect CSI Based on Game Theory
2014
International Journal of Control and Automation
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In this paper, the problem of power control for cognitive systems is studied via game theory. ...
Simulation results show that under imperfect CSI the proposed approach can converge to a locally optimal transmission power level, while the sum utility of SUs converges with the increase of the transmission ...
In [3] , a power consumption minimization problem is formulated under a sum rate constraint for a cognitive MIMO system. ...
doi:10.14257/ijca.2014.7.12.10
fatcat:ex2a3r3btnanrkmswnyuypvcfa
Minimum power transmission design for cognitive radio networks in non-stationary environment
2011
IEICE Electronics Express
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In this paper, we develop an approach to allow the cognitive radio to operate in the presence of the licensed user using bioinspired method called particle swarm optimization. ...
This method is invoked to solve the constrained nonlinear optimization problem for the minimum power transmission and minimum bit error rate in order to reach to maximum capacity. ...
Proposed scheme shows the performance of a heuristic improvement in cognitive radio performance in a dynamic environment. ...
doi:10.1587/elex.8.136
fatcat:sih6diydlbcmhk64drtgk4ojle
Robust Power Control Algorithm for Multiple Primary Users and Secondary Users in Cognitive Radio Networks
2014
International Journal of Control and Automation
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The aim is to maximize the sum rate of SUs under the interference power constraints at PUs, the total transmission power constraint of SUs. ...
The objective is to maximize the sum rate of secondary users (SUs) subject to the primary users (PUs) interference power constraints and the transmission power constraint of SUs. ...
Under ellipsoid approximation [10] , the true channel coefficient To improve the system performance of the secondary network, we employ a power control strategy to maximize its sum rate under the interference ...
doi:10.14257/ijca.2014.7.11.08
fatcat:it3zcmnsijf5llnqa5lc5bb7ga
Cognitive Medium Access: A Protocol for Enhancing Coexistence in WLAN Bands
2007
IEEE GLOBECOM 2007-2007 IEEE Global Telecommunications Conference
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A time-slotted physical layer for the cognitive radio is considered and CMA is derived based on experimental models. ...
Numerical results are presented for typical coexistence setups and show a significant performance improvement. ...
Related work CMA is relevant to both the cognitive radio and the coexistence community. ...
doi:10.1109/glocom.2007.676
dblp:conf/globecom/GeirhoferTS07
fatcat:2rcjjrqyizh2lb2qehvpuvcy3i
Breaking Spectrum Gridlock With Cognitive Radios: An Information Theoretic Perspective
2009
Proceedings of the IEEE
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This information theoretic survey provides guidelines for the spectral efficiency gains possible through cognitive radios, as well as practical design ideas to mitigate the coexistence challenges in today's ...
Cognitive radios hold tremendous promise for increasing spectral efficiency in wireless systems. ...
UNDERLAY COGNITIVE RADIO The underlay approach to cognitive radio allows simultaneous cognitive and noncognitive communication under the constraint that the interference caused to the noncognitive user ...
doi:10.1109/jproc.2009.2015717
fatcat:rvnkortxtneb7loisy6ceeriwy
A Survey on MAC Strategies for Cognitive Radio Networks
2012
IEEE Communications Surveys and Tutorials
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Dynamic spectrum policies combined with software defined radio are powerful means to improve the overall spectral efficiency allowing the development of new wireless services and technologies. ...
First, we show the fundamental role of the MAC layer and identify its functionalities in a cognitive radio (CR) network. Second, a classification of cognitive MAC protocols is proposed. ...
MGDB work was supported by COST Action IC0902 "Cognitive Radio and Networking for Cooperative Coexistence of Heterogeneous Wireless Networks", funded by the European Science Foundation and by FP7-ICT Network ...
doi:10.1109/surv.2011.111510.00108
fatcat:t7s4waiiufhohciz6nbzxqcruq
Spectrum Sharing in Cognitive Radio Prop up the Minimum Transmission Power and Maxi-Min SINR Stratagem
2013
Research Journal of Applied Sciences Engineering and Technology
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With the rapid growth of vigilance that cognitive radio participate an essential task in wireless communication to resolve the spectrum scarcity vs. under-utilization dilemma owing to the dormant spectrum ...
In conclusion, the author give a novel idea about the seminal work of spectrum sharing by minimizing transmit power strategy and maximizing Signal to Interference plus Noise Ratio (SINR) strategy which ...
at each receiver under the constraint of limited transmission power. ...
doi:10.19026/rjaset.6.3546
fatcat:6d5p6anegfakjjly3xyu5wvdw4
Joint Beamforming and Power Allocation Cognitive Radio Networks under Imperfect CSI
2015
International Journal of Future Generation Communication and Networking
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Our objective is to maximize the sum utility of secondary users (SUs) under the primary users (PUs) interference power constraints and the transmission power constraint of SUs. ...
Traditional beamforming and power control algo-rithms in cognitive radio (CR) are based on the assumption of perfect channel state information (CSI) however; this may lead to performance degradation in ...
Acknowledgements This research was supported by the Absorption of Imported Technology and Innovation Special Funds of China (No. JJ-YJCX-04-10-2828). ...
doi:10.14257/ijfgcn.2015.8.1.17
fatcat:hrybtxjcdzbr7jnuxzdvdq35eu
Subcarrier and power allocation in OFDM based cognitive radio networks A Survey
IJARCCE - Computer and Communication Engineering
2014
IJARCCE
IJARCCE - Computer and Communication Engineering
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This paper investigates the subcarrier and power allocation problem for an OFDM-based cognitive radio (CR) system. ...
For CR systems it is important to keep the interference below the certain threshold to the primary user and the total power allocated to the CR user under a constraint . ...
The design of power allocation strategies for the secondary user fading channel under the constraint on the maximum acceptable PU transmission outage probability is considered. ...
doi:10.17148/ijarcce.2014.31219
fatcat:tr2ex6hfebhj3nxrnzyoujgyiq
Multi-antenna transmission for underlay and overlay cognitive radio with explicit message-learning phase
2013
EURASIP Journal on Wireless Communications and Networking
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First, for the uncoordinated underlay cognitive radio scenario, we fully characterize the optimal parameters that maximize the secondary rate subject to a primary rate constraint for a transmission strategy ...
We then propose a transmission strategy that combines techniques for cooperative communication and for the classical cognitive radio channel. ...
The authors would like to thank Adrian Kliks for the interesting discussions and valuable comments. ...
doi:10.1186/1687-1499-2013-195
fatcat:aqdamjgac5ay3frsmet3wj2pia
Optimal power allocation for cognitive relay networks: amplify-and-forward versus selection relay
2010
Science China Information Sciences
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In this network, a source is assisted by cognitive relay nodes which allow coexisting with primary user nodes by imposing severe constraints on the transmission power so that they operate below the noise ...
In this paper, we mainly study the power allocation strategies of this system to minimize the outage probability subject to total and individual power constraints for cognitive relay nodes and subject ...
To deal with the conflicts between spectrum scarcity and spectrum under-utilization, cognitive radio [2] has been considered as an efficient approach to improving the spectrum utilization by spectrum ...
doi:10.1007/s11432-010-4156-9
fatcat:gzxvgijj2nd2lld5wh2boriesy
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