Cognitive Radio Communication and Applications for Urban Spaces

2019 ◽  
pp. 161-183 ◽  
Author(s):  
Anandakumar Haldorai ◽  
Arulmurugan Ramu ◽  
Suriya Murugan
Keyword(s):  
Cognitive Radio ◽  
Urban Spaces ◽  
Radio Communication

scholarly journals Uma proposta para a melhoria da descoberta de vizinhos em Redes Cognitivas

2018 ◽  
Vol 1 (38) ◽  
pp. 69
Author(s):  
Yngrid Keila Silva Cabral ◽  
Joab De Araújo Silva ◽  
Marcelo Portela Sousa
Keyword(s):  
Cognitive Radio ◽  
Cognitive Radio Networks ◽  
Computer Network ◽  
Cognitive Radios ◽  
Radio Networks ◽  
Cognitive Networks ◽  
Radio Communication ◽  
Efficient Approach ◽  
Opportunistic Access ◽  
Sensing Model

Several wireless services make use of the spectrum for communication, from space radio communication to a simple wireless computer network. However, the considerable amount of services that make use of spectrum in the last years, has been responsible for its limited availability and inefficiency.. Cognitive networks or cognitive radio networks, are a technology that offer the efficient use of spectrum through opportunistic access to frequency bands. Throughout the cognitive radios scenario, this work will present a variation of the JENNA neighbors discovery algorithm. In addition to that, this research will propose a sensing model for a more efficient approach.

scholarly journals Anti-Wiretap Spectrum-Sharing for Cooperative Cognitive Radio Communication Systems

Sensors ◽  
2019 ◽  
Vol 19 (19) ◽  
pp. 4142
Author(s):  
Peiyuan Si ◽  
Weidang Lu ◽  
Kecai Gu ◽  
Xin Liu ◽  
Bo Li ◽  
...  
Keyword(s):  
Cognitive Radio ◽  
Wireless Communication ◽  
Cooperative Communication ◽  
Communication Systems ◽  
Spectrum Sharing ◽  
Transmission Rate ◽  
Primary System ◽  
Radio Communication ◽  
Sharing Scheme ◽  
Simulation Results

As wireless communication technology keeps progressing, people’s requirements for wireless communication quality are getting higher and higher. Wireless communication brings convenience, but also causes some problems. On the one hand, the traditional static and fixed spectrum allocation strategy leads to high wastefulness of spectrum resources. The direction of improving the utility of spectrum resources by combining the advantages of cooperative communication and cognitive radio has attracted the attention of many scholars. On the other hand, security of communication is becoming an important issue because of the broadcasting nature and openness of wireless communication. Physical-layer security has been brought into focus due to the possibility of improving the security in wireless communication. In this paper, we propose an anti-wiretap spectrum-sharing scheme for cooperative cognitive radio communication systems which can secure the information transmission for the two transmission phases of the cooperative communication. We maximized the secondary system transmission rate by jointly optimizing power and bandwidth while ensuring the primary system achieves its secrecy transmission rate. Useful insights of the proposed anti-wiretap spectrum-sharing scheme are given in the simulation results. Moreover, several system parameters are shown to have a big impact for the simulation results.

Frameworks of non-orthogonal multiple access techniques in cognitive radio communication systems

2019 ◽  
Vol 16 (6) ◽  
pp. 129-149
Author(s):  
Prabhat Thakur ◽  
Alok Kumar ◽  
S Pandit ◽  
G Singh ◽  
S N Satashia
Keyword(s):  
Cognitive Radio ◽  
Communication Systems ◽  
Multiple Access ◽  
Radio Communication

scholarly journals Design and implementation of spatial interweave LTE-TDD cognitive radio communication on an experimental platform

2013 ◽  
Vol 20 (2) ◽  
pp. 60-67 ◽  
Author(s):  
Boris Kouassi ◽  
Luc Deneire ◽  
Bassem Zayen ◽  
Raymond Knopp ◽  
Florian Kaltenberger ◽  
...  
Keyword(s):  
Cognitive Radio ◽  
Radio Communication ◽  
Experimental Platform ◽  
Design And Implementation

scholarly journals Opportunistic Communication (Cognitive Radio) over Primary Discarded Subchannels by Applying a Double Power Distribution

2010 ◽  
Vol 2010 ◽  
pp. 1-9
Author(s):  
G. A. Medina-Acosta ◽  
José A. Delgado-Penín
Keyword(s):  
Cognitive Radio ◽  
Power Distribution ◽  
Primary User ◽  
Total Power ◽  
Radio Communication ◽  
Power Constraint ◽  
Transmission Scheme ◽  
Opportunistic Communication ◽  
Optimal Power ◽  
Channel Realization

This paper proposes the establishment of a simultaneous cognitive radio communication based on a subdistribution of power made over unselected subchannels which were discarded by the primary user through an initial optimal power allotment. The aim of this work is to show the possibility of introducing an opportunistic communication into a licensed transmission where the total power constraint is shared. The analysis of the proposed transmission scheme was performed by considering 128 and 2048 independent subchannels affected byRayleighfading, over 10,000 channel realizations, and three different signal-to-noise ratios (8 , 16 , and 24 ). From the system evaluation it was possible to find the optimal power allotment for the primary user, the subdistribution of power for the secondary user, as well as the attenuation and the capacity per subchannel for every channel realization. Moreover, thePDFandCDFof the total obtained capacities, as well as the generation of empirical capacity regions, were estimated as complementary results.

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