Opportunistic access in frequency hopping cognitive radio networks

2014 ◽  
Keyword(s):  
Cognitive Radio ◽  
Cognitive Radio Networks ◽  
Frequency Hopping ◽  
Radio Networks ◽  
Opportunistic Access

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.

An Architecture for Coexistence with Multiple Users in Frequency Hopping Cognitive Radio Networks

2014 ◽  
Vol 32 (3) ◽  
pp. 563-571 ◽  
Author(s):  
Ryan K. McLean ◽  
Mark D. Silvius ◽  
Kenneth M. Hopkinson ◽  
Bridget N. Flatley ◽  
Ethan S. Hennessey ◽  
...  
Keyword(s):  
Cognitive Radio ◽  
Cognitive Radio Networks ◽  
Frequency Hopping ◽  
Radio Networks ◽  
Multiple Users

scholarly journals Optimizing Cooperative Cognitive Radio Networks with Opportunistic Access

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Ammar Zafar ◽  
Mohamed-Slim Alouini ◽  
Yunfei Chen ◽  
Redha M. Radaydeh
Keyword(s):  
Resource Allocation ◽  
Cognitive Radio ◽  
Cognitive Radio Networks ◽  
Symbol Error Rate ◽  
Radio Networks ◽  
Optimal Resource Allocation ◽  
Cooperative Cognitive Radio Networks ◽  
Nonconvex Functions ◽  
Opportunistic Access ◽  
Optimal Resource

Optimal resource allocation for cooperative cognitive radio networks with opportunistic access to the licensed spectrum is studied. Resource allocation is based on minimizing the symbol error rate at the receiver. Both the cases of all-participate relaying and selective relaying are considered. The objective function is derived and the constraints are detailed for both scenarios. It is then shown that the objective functions and the constraints are nonlinear and nonconvex functions of the parameters of interest, that is, source and relay powers, symbol time, and sensing time. Therefore, it is difficult to obtain closed-form solutions for the optimal resource allocation. The optimization problem is then solved using numerical techniques. Numerical results show that the all-participate system provides better performance than its selection counterpart, at the cost of greater resources.

Myopic policy for opportunistic access in cognitive radio networks by exploiting primary user feedbacks

2015 ◽  
Vol 9 (7) ◽  
pp. 1017-1025 ◽  
Author(s):  
Kehao Wang ◽  
Lin Chen ◽  
Quan Liu ◽  
Xiaolin Ma ◽  
Fangmin Li
Keyword(s):  
Cognitive Radio ◽  
Cognitive Radio Networks ◽  
Primary User ◽  
Radio Networks ◽  
Opportunistic Access ◽  
Myopic Policy
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