Cyclostationarity Approach to Joint Blind Estimation of CP-SCLD Block Transmission Parameters for Cognitive Radio

2010 ◽  
Author(s):  
Q. Zhang ◽  
O. A. Dobre ◽  
S. Rajan ◽  
R. Inkol
Keyword(s):  
Cognitive Radio ◽  
Blind Estimation ◽  
Block Transmission ◽  
Transmission Parameters

scholarly journals The Spectrum Sensing and Path Optimization Techniques in Cognitive Radio Networks

2019 ◽  
Vol 8 (10) ◽  
pp. 2406-2411
Keyword(s):  
Cognitive Radio ◽  
Spectrum Sensing ◽  
Cognitive Radio Networks ◽  
Radio Networks ◽  
Optimization Techniques ◽  
Path Optimization ◽  
System Innovation ◽  
Transmission Parameters ◽  
The Earth ◽  
Intellectual System

Cognitive Radio (CR) is a versatile, insightful radio and system innovation that can naturally recognize accessible directs in a remote range and change transmission parameters empowering more interchanges to run simultaneously and furthermore improve radio working conduct. The primary thought of the intellectual system is to give the range band to the unlicensed clients without making any damage to the earth. By utilizing the recurrence range band, we came to utilization of these intellectual systems. Right off the bat, we have to frame the system through any methodologies .we are utilizing optimization Mechanisms for path identification in cognitive Radio.

scholarly journals Mathematical Quantification of Transmission in Experiments: FMDV Transmission in Pigs Can Be Blocked by Vaccination and Separation

2020 ◽  
Vol 7 ◽  
Author(s):  
Aldo Dekker ◽  
Herman J. W. van Roermund ◽  
Thomas J. Hagenaars ◽  
Phaedra L. Eblé ◽  
Mart C. M. de Jong
Keyword(s):  
Foot And Mouth Disease ◽  
Control Measures ◽  
Physical Separation ◽  
Block Transmission ◽  
Transmission Parameters ◽  
Mouth Disease Virus ◽  
Significant Difference ◽  
Contact Transmission ◽  
Quantitative Understanding ◽  
Transmission Studies

Quantitative understanding of transmission with and without control measures is important for the control of infectious diseases because it helps to determine which of these measures (or combinations thereof) will be effective to reduce transmission. In this paper, the statistical methods used to estimate transmission parameters are explained. To show how these methods can be used we reviewed literature for papers describing foot-and-mouth disease virus (FMDV) transmission in pigs and we used the data to estimate transmission parameters. The analysis showed that FMDV transmits very well when pigs have direct contact. Transmission, however, is reduced when a physical barrier separates infected and susceptible non-vaccinated pigs. Vaccination of pigs can prevent infection when virus is administered by a single intradermal virus injection in the bulb of the heel, but it cannot prevent infection when pigs are directly exposed to either non-vaccinated or vaccinated FMDV infected pigs. Physical separation combined with vaccination is observed to block transmission. Vaccination and separation can make a significant difference in the estimated number of new infections per day. Experimental transmission studies show that the combined effect of vaccination and physical separation can significantly reduce transmission (R < 1), which is a very relevant result for the control of between-farm transmission.

scholarly journals A Testbed Design of Spectrum Management in Cognitive Radio Network using NI USRP and LabVIEW

2019 ◽  
Vol 8 (9S2) ◽  
pp. 257-262
Keyword(s):  
Cognitive Radio ◽  
Spectrum Sharing ◽  
Primary User ◽  
Spectrum Management ◽  
Interference Avoidance ◽  
Mobility Spectrum ◽  
Free Communication ◽  
Transmission Parameters ◽  
Radio Technology ◽  
Different Characteristics

Cognitive radio automatically detects the available channel in the wireless communication and has an adaptive radio technology network. It also changes the transmission parameters to run concurrently for more smooth communication. CR network allows the user to utilize the band in an opportunistic manner because it has different characteristics like capabilities and re-configurability. In this article, it shown the methodology, on how the primary user and the secondary user should communicate to provide error free communication. And also the framework on how to overcome the unique challenges occurred in the spectrum management like interference avoidance, QoS awareness and seamless communication. We also discussed about spectrum mobility, spectrum sharing, spectrum decision, and also spectrum sensing which are the characteristics of spectrum management

scholarly journals Cognitive Radio in Digital Agriculture: A Physical Layer Overlay Based Underground Radio Propagation System

2020 ◽  
Author(s):  
Usman Raza ◽  
Abdul Salam ◽  
Umit Karabiyik
Keyword(s):  
Cognitive Radio ◽  
Cognitive Radios ◽  
Relay Node ◽  
Physical Layer ◽  
System Capacity ◽  
Interference Avoidance ◽  
Agricultural Field ◽  
Transmission Parameters ◽  
Digital Agriculture ◽  
Power And Rate Allocation

Abstract In digital agriculture, the cognitive radio technology is being envisaged as solution to spectral shortage problems by allowing agricultural cognitive users to co-exist with PU in the same spectrum on the field. Cognitive radios increase system capacity and spectral efficiency by sensing the spectrum and adapting the transmission parameters. This design requires a robust, adaptable and flexible physical layer to support cognitive radio functionality. In this paper, two different approaches are proposed to improve the application of cognitive radios in agriculture. A novel physical layer architecture for cognitive radio based on cognition, cooperation, and cognitive interference avoidance has been developed by using power control for digital agriculture applications. The design is based on sensing of spectrum usage, detecting the message/spreading code of PU, cognitive relaying, cooperation, and cognition of channel parameters. Moreover, the power and rate allocation, ergodic, and outage capacity formulas are also presented. Furthermore, a two-hop load balancing approach is presented using a cognitive radios as a relay node in the network to improve throughput and optimize the load between different area of an agricultural field.

Optimization of a novel Nakagami-m Fading Affected Multiuser Cognitive Radio System Using a New Hybrid DE/BBO/SA

2020 ◽  
Vol 10 ◽  
Author(s):  
Kiranjot Kaur ◽  
Munish Rattan ◽  
Manjeet Singh Patterh
Keyword(s):  
Simulated Annealing ◽  
Cognitive Radio ◽  
Statistical Test ◽  
Radio System ◽  
Fitness Functions ◽  
Transmission Parameters ◽  
Cr System ◽  
Parametric Statistical Test ◽  
Parameter Values ◽  
General Communication

Background and Objective: This communication introduces a multiple secondary user (SU) cognitive radio (CR) system in a dynamic fading environment, specifically Nakagami-m fading. The transmission parameters of CR system are optimized to turn it into an optimal design. Method: For this purpose, a new hybrid of differential evolution, biogeography-based optimization with simulated annealing, namely DE/BBO/SA is proposed. The suggested method searches the best CR parameter values while accomplishing general communication objectives. Fitness functions of these objectives are modified to include fading as well as to accommodate multiple carriers. Results and Conclusion: DE/BBO/SA generated results in terms of optimized parameters, fitness core and values of the objectives are compared with the ones acquired by other available techniques in literature to show efficacy of DE/BBO/SA in cognitive radio optimization. The performances are further validated by conducting a non-parametric statistical test to prove the use of proposed technique for solving CR problem.

Introduction to Cognitive Radio Networks

2013 ◽  
pp. 1-30 ◽  
Author(s):  
Natarajan Meghanathan
Keyword(s):  
Cognitive Radio ◽  
Dynamic Spectrum Access ◽  
Dynamic Spectrum ◽  
Spectrum Access ◽  
Medium Access ◽  
Secondary Users ◽  
Comprehensive Review ◽  
Primary Users ◽  
Transmission Parameters ◽  
Perceived Availability

A cognitive radio (CR) is a radio that can change its transmission parameters based on the perceived availability of the spectrum bands in its operating environment. CRs support dynamic spectrum access and can facilitate a secondary unlicensed user to efficiently utilize the available underutilized spectrum allocated to the primary licensed users. A cognitive radio network (CRN) is composed of both the secondary users with CR-enabled radios and the primary users whose radios need not be CR-enabled. In this chapter, the authors provide an exhaustive analysis of the issues and the state-of-the-art literature solutions available with regards to the following four layers of the TCP/IP protocol layer stack, in the context of CRNs: physical layer (spectrum sensing), medium access control, routing, and transport layers. We discuss the various techniques/mechanisms/protocols that have been proposed for each of these four layers, in the context of CRNs. In addition to the above, we discuss in detail several security attacks that could be launched on CRNs and the countermeasure solutions that have been proposed to avoid or mitigate them. This chapter serves as a good comprehensive review and analysis of all the critical aspects for CRNs, and would lay a strong foundation for someone to further delve onto any particular aspect in greater depth.

Blind Estimation of OFDM Parameters in Cognitive Radio Networks

2011 ◽  
Vol 10 (3) ◽  
pp. 733-738 ◽  
Author(s):  
A. Punchihewa ◽  
Vijay K. Bhargava ◽  
Charles Despins
Keyword(s):  
Cognitive Radio ◽  
Cognitive Radio Networks ◽  
Radio Networks ◽  
Blind Estimation

scholarly journals Cognitive Radio Techniques over Conventional Radio Systems

2019 ◽  
Vol 9 (2) ◽  
pp. 3330-3333
Keyword(s):  
Cognitive Radio ◽  
Power Consumption ◽  
Working Condition ◽  
Crossing Over ◽  
Performance Parameters ◽  
Spectrum Utilization ◽  
Authorized User ◽  
Transmission Parameters ◽  
Radio Systems ◽  
Spectrum Holes

Cognitive Radio (CR) has advanced like a brilliant innovation for crossing over the divergence between the accessibility and assignment of the radio recurrence range among various clients. It can change its transmission parameters dependent on the apparent accessibility of the range groups in its working condition. Cognitive radio (CR) innovation vows to be one potential answer for take care of the issue of absence of recurrence range, by permitting access of unlicensed clients in authorized groups, in view of a shrewd methodology and without meddling with the authorized user(PU). Subjective Radio has developed as a savvy innovation in crossing over the divergence between the accessibility and distribution of the radio recurrence range among numerous clients. This paper shows an outline of the spectrum holes in the licensed bands, the concepts of CR, types, spectrum holes, its features and sensing methods the transceiver details and it compares with conventional radio in terms of performance parameters such as interference, operating frequency, security, spectrum utilization, reliability, efficiency and power consumption

scholarly journals Development of efficient VoIP application using cognitive radio networks

2018 ◽  
Vol 7 (3.3) ◽  
pp. 419
Author(s):  
C Sharanya ◽  
M Meena ◽  
M Monisha ◽  
Dr V. Rajendran ◽  
. .
Keyword(s):  
Cognitive Radio ◽  
Cognitive Radio Networks ◽  
Mobile Applications ◽  
Radio Networks ◽  
Commercial Use ◽  
Transmission Parameters ◽  
Effective System ◽  
Radio Technology ◽  
Personal Use ◽  
Wireless Spectrum

There is an increased usage of wireless communication for personal use, commercial use etc. Nowadays Cognitive Radio has become the prime topic of interest in wireless network. It is an intelligent radio technology, which easily adapts to the network and automatically detects the vacant channels which are available in a wireless spectrum. It then changes the transmission parameters enabling concurrent communica-tions thereby improving the radio operating behavior. VoIP mobile applications are used worldwide for making audio and video calls using internet. But they face many disadvantages such as reflection of voice/echo, breaking of voice, delay in voice etc and have reduced quality with low Wi-Fi or 3g signals. Therefore we are designing an efficient and effective system to improve throughput and bit error rate of VoIP mobile applications by implementing them using cognitive radio networks. 

scholarly journals Cognitive Radio Spectrum Sensing Mechanisms in TV White Spaces: A Survey

2018 ◽  
Vol 8 (6) ◽  
pp. 3673-3680
Author(s):  
K. Kimani ◽  
M. Njiraine
Keyword(s):  
Cognitive Radio ◽  
Spectrum Sensing ◽  
Spectrum Sharing ◽  
Limited Resource ◽  
Radio Spectrum ◽  
Spectrum Utilization ◽  
Transmission Parameters ◽  
Wireless Users ◽  
Radio Technology ◽  
Cognitive Radio Technology

Frequency spectrum is a limited resource and the increasing demand caused by emerging services, augmented number of wireless users along with the demand for high-quality multimedia applications have resulted in the overcrowding of the allocated spectrum bands. The overcrowding of spectrum bands has exacerbated by the current spectrum licensing policy which has emerged as a bottleneck to efficient spectrum utilization, due to its inflexibility, resulting in most of the licensed spectrum being severely under-utilized. However, the problem of scarcity of spectrum bands and the inefficient utilization of the already allocated radio spectrum can be smartly addressed through spectrum sharing by enabling opportunistic usage of the underutilized frequency bands. One of the most exciting ways of spectrum sharing is cognitive radio technology which allows a wireless node to sense the environment, detect the network changes, and then make intelligent decisions by dynamically changing its reception or transmission parameters to communicate while ensuring that no interference is affected to the licensed users. It thus improves the spectrum utilization by reusing the unused or underutilized spectrum owned by the incumbent systems (primary systems). In this paper, a comprehensive survey and review of recent research about the advances in cognitive radio technology will be carried out. We will also evaluate the various spectrum sensing techniques in a cognitive radio network in the UHF/VHF bands allocated for TV broadcasting.

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