ENGINEERING RESEARCH PAPERS

free research papers-wireless-cognitive radio design recent 2014


Consider a radio which autonomously detects and exploits empty spectrum to increase your file transfer rate. Suppose this same radio could remember the locations where your calls tend to drop and arrange for your call to be serviced by a different carrier for those locations. These are some of the ideas motivating the development of cognitive radio. In effect, a cognitive radio is a software radio whose control processes leverage situational knowledge and intelligent processing to work towards achieving some goal related to the needs of the user, application, and/or network.

Cyclostationary Detection Based Spectrum Sensing for Cognitive Radio Networks
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Abstract:In this paper, cyclostationary detection Based spectrum sensing is considered for cognitive radio networks. We first summarize the existing first-order and second-order cyclostationary detection algorithms, which can be considered as a brief tutorial on

Soft Computing based Learning for Cognitive Radio.
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Abstract:Over the last decade the world of wireless communications has been undergoing some crucial changes, which have brought it at the forefront of international research and development interest, eventually resulting in the advent of a multitude of innovative

Dynamic Spectrum Sensing Techniques For Cognitive Radio-Based Wireless Communication
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Abstract: Cognitive radio (CR) is a new paradigm wireless communication system which is use for efficient utilization of radio frequency (RF) spectrum or RF channel for future wireless communication. The motivation behind cognitive radio is the insufficiency of the existing

Poster: a simulation analysis on the hop count of multi-hop path in cognitive radio ad-hoc networks
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ABSTRACT The number of hops between source node and destination node is one of key parameter in studying multi-hop ad-hoc networks. Although hop count in conventional ad- hoc networks has been well studied, to the best of our knowledge, there have no works

Literature Review of Cognitive Radio Spectrum Sensing EE 359 Project
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Due to the increased usage of wireless communications in personal, commercial, and governmental capacities, efficient spectrum utilization has become a prime topic of interest. The Federal Communications Commission (FCC) governs spectrum usage and allocates

Improving the Existing Spectrum Sensing Techniques for Cognitive Radio using Modulation Techniques
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Abstract: Cognitive Radio plays an important role in wireless communication. With the ever increasing demand for wireless communications, the spectrum has become a scarce resource. It is becoming a major obstacle for the development of new wireless

EVOLUTION OF UWB SLOTTED C SHAPED MONOPOLE ANTENNA FOR COGNITIVE RADIO APPLICATIONS
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Abstract: The proposed antenna designed specifically for Cognitive radio applications consists of a circular monopole which is evolved into the C shaped slotted monopole by a systematic process. The evolution of antenna is detailed. The evolved geometry enhances

Energy-Efficient, Learning-Inspired Channel Decision and Access Technique for Cognitive Radio-based Wireless Sensor Networks
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Abstract Cognitive radio-based wireless sensor network is the next-generation sensor network paradigm. Important to this emerging sensor network is the need to reduce energy consumption, paving way for 'green'communication among sensor nodes. Therefore, in Spectrum sensing is critically important for cognitive radio, an emerging solution to the spectrum congestion and low usage of licensed spectrum. Energy detection is a promising low-complexity and low-cost spectrum sensing technique. Its performance analysis has

Implementation of Optimization Algorithm by Sub-Carriers Assignment and Power Allocation for LTE and Cognitive Radio Network using OFDM Signal
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ABSTRACT The optimization algorithm had been analysed for the improvement of the spectrum efficiency and check trade-off between capacity and fairness for cognitive networks in a low algorithm complexity. Different low complexity algorithms for proportional During the last few decades, our use of or reliance on the radio spectrum has grown tremendously. Today, we rely on wireless devices and systems to not only enable on- demand, pervasive communications for a large proportion of the population, but also other

Cooperative and Non-Cooperative Games for Spectrum Sharing in Cognitive RadioNetworks: A Comparative Study
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Abstract Spectrum sharing in cognitive radio networks is essential to ensure effective communication between secondary users. Game theory is suitable to be applied to the spectrum sharing strategies since it considers strategic interactions between users. There

Cognitive Radio Technology: System Evolution
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Abstract:Cognitive Radio is a novel method of radio communication which enables more efficient use of the frequency spectrum. This efficiency is achieved by dynamically allocating frequency bands within the spectrum to different users. Within the field of Cognitive Radio,

Performance of a Smart Antenna Equipped Cognitive Radio System in Rayleigh-Fading Channel
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Abstract Conventional cognitive radios exploit the licensed spectrum by opportunistically seeking the underutilized radio resource in time, frequency and geographic domains. But using smart antennas, the angle (space) spectrum can be utilized and thus leading to

Challenges in Cognitive Radio Sensor Networks
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Abstract Current spectrum resources are lack due to inflexible spectrum sharing regulations and underutilization of licensed band for primary users (PUs). Cognitive radio (CR) technology is proposed to address this problem. CR technology enables secondary users

Novel Technique of Spectrum Sensitarget detection probability constraint
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Abstract Cognitive radio has attracted an increasing amount of interest over the past few years as an effective method of alleviating the spectrum scarcity problem in wireless communications. One of the most promising approaches in cognitive radio is the

A Game Theory based Model for Cooperative Spectrum Sharing in Cognitive Radio
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Abstract This paper throws light on the issue of spectrum sharing in cognitive radio networks where the secondary users cooperatively sense the spectrum for identifying and accessing temporarily unoccupied frequency spectrum bands. Here, it is shown that this issue can be

Boosted Energy Detector Based Spectrum Sensing Methodology For Cognitive Radio
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Abstract: Proliferation of spectrum-based service, in the recent years have forced the human society to become highly dependent on the radio spectrum. It is therefore not surprising that we are facing a difficult situation in wireless communications. Cognitive radio, a novel

Efficient Resource Allocation Algorithm with Rate Requirement Consideration in Multicarrier-Based Cognitive Radio Networks
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Abstract:In this paper, we present an efficient downlink resource allocation algorithm with rate requirement consideration in multicarrier-based cognitive radio (CR) networks. The algorithm is divided into two steps aiming to maximize the downlink capacity of the

Adaptive Double Threshold based Spectrum Sensing for Cognitive Radio Networks
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Abstract Rapid growth of wireless communication and limited spectrum availability to support the applications and services, has led to the development of cognitive radio as promising solution to address the problem of spectrum scarcity. Spectrum sensing is one

Spoofing optimization over Nakagami-m fading channels of a cognitive radio adversary
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Abstract:We examine the performance of a cognitive radio system in a hostile environment where an intelligent adversary tries to disrupt communications by spoofing. We analyze a cluster-based network of secondary users (SUs), where sensing is performed by the

Spectrum Sensing for Cognitive Radio Users using Constant Threshold Range in Energy Detector
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Abstract Spectrum Sensing has an important role in Cognitive Radio Network (CRN). Different methodologies have been proposed in the literature for spectrum sensing. Energy detector method is more practical and less in complexity. This paper presents analysis of

Energy Efficient Cognitive Radio Hybrid Voting Rule–PSO
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ABSTRACT-In this paper, a cooperative framework in cognitive radio networks is proposed. A Cognitive radio is an extension to SDR, where one allows the radio system to adapt to its environment through learning or artificial intelligence with the aim of increasing Abstract This chapter examines the enabling role of cognitive radio technologies for unmanned aircraft systems to access more spectrum needed for flight operations. Analysis of stakeholders sets the requirements for cognitive radios. With these requirements, the

OVERVIEW AND LITERATURE SURVEY ON ROUTING PROTOCOLS FOR COGNITIVE RADIO NETWORKS
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Abstract: Cognitive radio (CR) technology is introduced to solve the problem of spectrum underutilization in wireless networks by opportunistically exploiting portions of the spectrum temporarily vacated by licensed primary users. Cognitive radio networks (CRNs)

A Routing Algorithm based on Semi-supervised Learning for Cognitive Radio Sensor Networks.
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Abstract: In Cognitive Radio Sensor Networks (CRSNs), the cognitive radio technology enables sensor nodes to occupy licensed bands in a opportunistic manner and provides advantages in terms of spectrum utilization and system throughput. This paper proposes a

A Routing Mechanism for Cognitive Radio Ad Hoc Networks
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Abstract. Node failure and link failure happen frequently in cognitive radio Ad Hoc networks. In order to maintain the connection between cognitive users and resume their communication as soon as possible when the current route is invalid, a reliable routing

Spectrum-Map-Empowered Opportunistic Routing for Cognitive Radio Ad Hoc Networks
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Abstract:Cognitive radio (CR) has emerged as a key technol-ogy for enhancing spectrum efficiency by creating opportunistic transmission links. Supporting the routing function on top of opportunistic links is a must for transporting packets in a CR ad hoc network (CRAHN) This work proposes a new method for identifying a primary user emulation attack (PUEA) at low signal–to–noise ratios (SNRs) in mobile cognitive radio (CR) networks. Channel–tap power is utilised as a radio–frequency (RF) fingerprint to directly detect users via physical

Study of Different Performance Parameters of Prototype Filter for Filter Bank MulticarrierCognitive Radio
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Abstract Cognitive Radio has proven as an optimum technique for getting improved spectrum utilization by sharing the radio spectrum with licensed primary users opportunistically. The cognitive radio is a new paradigm to overcome the persisting

Performance Analysis of Energy Detection and Cooperative Spectrum Sensing Technique forCognitive Radio over AWGN and Fading Channels
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Abstract:Spectrum sensing is the basic and important operation in Cognitive Radio (CR) to find the unused spectrum. This paper focuses on Energy detection because of ease in implementation and Cooperative Spectrum sensing because it doesn't require transmitted

PRIMARY USER AUTHENTICATION IN COGNITIVE RADIO NETWORKS: A SURVEY
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ABSTRACT: For effective usage of radio frequency spectrum, cognitive radio networks have been proposed, allowing the secondary users to occupy the spectrum whenever the primary user is not using it. To avoid interference with the primary user secondary user should

The Security of Physical Layer in Cognitive Radio Networks
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Abstract:Cognitive Radio (CR) is a novel technology that promises to solve the lack of spectrum by allowing secondary users to use licensed band, so that they can coexist with primary users without causing interference to their communications. With the development The CRN technology permits the unlicensed operation to be in licensed band. The CRN model poses many challenges in power efficiency, spectrum management, spectrum detection, environment awareness, new distributed algorithm design, distributed spectrum

A Self-Trust Detection Scheme against Cooperative Sensing Misbehavior in Cognitive RadioNetworks
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Abstract Cooperative sensing is one of the available technologies to increase access opportunity for unused spectrum and avoid interference to the primary users in cognitive radio networks. However, some secondary users (SUs), defined as attackers, can cause Due to significant advances in wireless access technologies and the proliferation of wireless devices and applications, there is a fundamental change in wireless network traffic. As predicted by a Cisco study, wireless data is expected to grow to 6.3 Exabytes per month The aim of this book is to present, in a tutorial perspective, the visions and trends for future wireless networks and technologies based, inspired, and learned from Cognitive Radio (CR) investigations that have been carried out within the framework of the COST Action IC0902 Transferring computations for cognitive radio network (CRN) management to a computer cloud opens the possibility to implement new, possibly more accurate and powerful resource management strategies. Algorithms to discover communication channels currently in use

Emulation Attack in Cognitive Radio Networks: AStudy
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A latest communication technology named Cognitive Radio Network is a network in which an un-licensed user can use a freed channel in a spectrum band of licensed user. One of the spectrum management functions is spectrum sensing which the most critical function in

Robust Multiband Spectrum Sensing in Cognitive Radio Networks via Exponentially Embedded Family Criterion.
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Abstract:This paper proposes a robust spectrum sensing scheme for cognitive radio networks. The proposal performs spectrum sensing simultaneously over the total channels rather than a single channel at a time. It first estimates the number of occupied channels

Energy Detection Performance of Cognitive Radio Networks
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Abstract:Nowadays, wireless networks show limits in terms of spectral resource, data rate, and quality of service. The cognitive radio is a new paradigm in the history of wireless communications. Cognitive radio is a promising technology which increased and

Interference-temperature limit for cognitive radio networks with MIMO primary users
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Abstract:This paper derives the interference-temperature (IT) limit for a multi-antenna primary user (PU) with a rate constraint. While in the case of a single-antenna PU there is a one-to-one mapping between IT and achievable rate, this correspondence does not hold

Robust Power Control Algorithm for Multiple Primary Users and Secondary Users inCognitive Radio Networks.
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Abstract Conventional distributed power control algorithms in cognitive radio (CR) are based on the assumption of perfect channel state information (CSI) which may lead to performance degradation in practical systems. In this paper, the robust distributed power control

Towards Improving Reliability in Cognitive Radio Ad hoc Networks
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Abstract: Cognitive Radio Ad hoc Networks (CRAHNs) are the next generation networking technology. Reliability is the major research paradigm in the field of CRAHNs. The proposed work is an extension to AODV routing protocol. This paper proposes a mechanism for

Throughput maximization of spectrum sharing cognitive radio networks
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Cognitive Radio technology helps in designing wireless system for efficient deployment of radio spectrum with its sensing technique, self adaptation and spectrum sharing. Spectrum sharing is an effective method of alleviating the scarcity of radio spectrum problem by

Game Theoretic Approach for Controlling Power in Cognitive Radio Networks: A Review
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Abstract: In recent years, game theory has emerged as a promising approach to solving the power control problem in wireless networks. Many of the power control techniques in cognitive radio networks use Game theoretic approach to maintain Quality of Service (QoS

Power Control for Cognitive Radio Networks under Imperfect CSI Based on Game Theory
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Abstract In this paper, the problem of power control for cognitive systems is studied via game theory. The objective is to maximize the sum utility of secondary users (SUs) subject to the primary users (PUs) interference constraints, the transmission power constraints of SUs,

Delay-Constrained Application Feasibility of Bandwidth Variable Cognitive Radio Systems using Random Access
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Abstract. In this paper, delay-QoS-provisioning capability of the random access-operated secondary network is analyzed. The performance of the delay-QoS-provisioning capability is evaluated in terms of the probability that delay-QoS is violated while the minimum

CROSS-LAYER MODELING AND OPTIMIZATION OF MULTI-CHANNEL COGNITIVE RADIONETWORKS UNDER IMPERFECT CHANNEL SENSING
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Abstract. In this paper, we consider a multi-channel cognitive radio network with multiple secondary users (SUs) and analyze the performance of users in the network. We assume primary users (PUs) adopt the automatic repeat request (ARQ) protocol at the medium

An Adaptive Precoder for Out-of-band Power Reduction in OFDM-Based Cognitive RadioSystem.
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Abstract Out-of-band (OOB) power emission is a conventional issue in orthogonal frequency division multiplexing (OFDM) system. The spectral leakage results in interference to licensed users (LU) in OFDM-based cognitive radio (CR) system. In this article, an adaptive The detection performance of cooperative spectrum sensing in cognitive radio networks is compromised by shadowing, multi-path fading and receiver uncertainty problems when the sensing results are forwarded to the fusion centre. In this paper, we propose a dynamic

Secondary User Power Saving in Overlay Cognitive Radio Networks
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ABSTRACT The secondary user power saving in the overlay based Hybrid Automatic Repeat request cognitive radio has been investigated. The effect of the power splitting ratio on the secondary transmissions has been studied and a simple power saving technique

Distributed Beamforming with Nodes Selection for Cognitive Radio Networks
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Abstract In order to collaboratively forward the Cognitive Radio (CR) signal to the Distant CR (DCR) users, we have introduced the Distributed Beamforming (DB) technique CR networks. However we face a practical difficulty of the extreme narrow main beam in the pattern

A POMDP Framework for Throughput Optimization MAC Scheme in Presence of Sensing Errors for Cognitive Radio Networks
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Abstract: In this paper, a POMDP (partially observable Markov decision process) framework MAC (media access control) scheme for throughput maximization in cognitive radio networks is presented. Due to hardware limitations and wireless channel dynamics which

Design Approach for Cognitive Radio on Heterogeneous Platform
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Cognitive Radio, that enables to specify and design the management architecture necessary to support the real-time adaptation and reconfiguration of the radio processing, whatever the implementation. In particular, we proposed HDCRAM to specify how to include sensing With the growing spectrum demand over the last decade, the use of cognitive radio networks (CRN) has provided a viable solution to spectrum scarcity problem. These networks basically employ two types of users: primary user (PU) and secondary user (SU). The PUs

Software Enabled Cognitive Radio Antenna System
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Abstract:In this paper we discuss an antenna system composed of a reconfigurable communicating antenna and a wideband antenna for sensing purposes. The communicating antenna is a microstrip antenna that is reconfigured by moving its ground plane in a Broadcast is an important operation in wireless networks where control information is usually propagated as broadcasts for the realization of most networking protocols. In traditional ad hoc networks, since the spectrum availability is uniform, broadcasts are

BER Performance Analysis of Filter Bank Multicarrier Using Sub band Processing for Physical Layer Cognitive Radio
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Abstract Cognitive Radio (CR) Technology has emerged from software defined radios wherein the key parameters of interest are frequency, power and modulation technique adopted. The role of Cognitive Radio is to alter these parameters under ubiquitous

SIMULATION AND ANALYSIS OF COGNITIVE RADIO SYSTEM USING MATLAB
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ABSTRACT The increasing demand of wireless applications has put a lot of limitations on the use of available radio spectrum is limited and precious resource. Many survey of spectrum utilization shows that entire spectrum is not used at all the times, so many of the

An Adaptive Spectrum Assignment Algorithm in Cognitive Radio Network
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Abstract:Today's wireless networks are characterized by a fixed spectrum assignment policy. On the other hand, a huge portion of the assigned spectrum is underutilized. But in contrast, rapid development of wireless communication technologies is seriously

Signal Detection for QPSK Based Cognitive Radio Systems using Support Vector Machines
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Abstract. Cognitive radio based network enables opportunistic dynamic spectrum access by sensing, adopting and utilizing the unused portion of licensed spectrum bands. Cognitive radio is intelligent enough to adapt the communication parameters of the unused licensed

SPECTRUM SCHEDULING: THE KEY FACTOR FOR MAXIMUM THROUGHPUT AND OPTIMAL RESOURCE UTILIZATION IN COGNITIVE RADIO NETWORK.
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ABSTRACT: the problem of spectrum scarcity becomes with the new devices and applications of wireless communication. The solution of this problem is the cognitive radio Networks. This paper presents the different scheduling techniques for the secondary user Multi-user orthogonal frequency division multiple access (OFDMA) network adaptive resource allocation is proposed. Subcarriers are assigned to each user in a way that ensures better spectrum efficiency; everyone is allocated power with quality of service (

Power Control Scheme Based on Cooperative Game Theory in Cognitive Radio Networks
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Abstract Game theory has been applied for resource allocation as an effective tool in multi- user communication system. It can be divided into two types, ie non-cooperative game and cooperative game. The non-cooperative game theory has been widely used for resource

Equilibrium Analysis and Social Optimization in Cognitive Radio Networks.
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Abstract This paper investigates the admission control problem in cognitive radio networks (CRNs) from the economic viewpoint. Each secondary user (SU) has the option of accessing the spectrum or balking on account of the trade-off between the service profit and the

Antennas and RF Front Ends for Cognitive Radio
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The current radio spectrum regulations assign specific bands to particular services and grant licensed bands access to only licensed users. This results in the inefficient use of the frequency spectrum, a problem for which Cognitive radio (CR)[1] is thought to provide a

Traffic Analysis of a Cognitive Radio Network Based on the Concept of Medium Access Probability.
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Abstract:The performance of a cognitive radio network (CRN) solely depends on how precisely the secondary users can sense the presence or absence of primary users. The incorporation of a spatial false alarm makes deriving the probability of a correct decision a

The Minimum Mean Square Precoding Method for Eliminating Asynchronous Interferences inCognitive Radio System.
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Abstract If there is a certain distance between the primary users and the second, there are asynchronous interferences because of existing nonsynchronous signals. And the interferences do not influence only the primary user system, but they could also affect

Frequency Analysis and Selection for Cognitive Radio using Fuzzy Logic System
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Abstract The spectrum scarcity is a great challenge in the future development of wireless communication devices. The idea of Cognitive radio was proposed for the solution of this problem. The research work presented in this paper addresses the Frequency Analysis

Issues in Realization of Cognitive Radio Sensor Networks.
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Abstract Recently, significant growth in the applications of the wireless sensor networks (WSNs) operating in unlicensed spectrum bands has been made. In the meantime, existing unlicensed bands are becoming congested and overcrowded. On the other hand,

Cooperative Spectrum Sensing over Correlated Rayleigh Fading Channels in Cognitive Radio using Factor Graph
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(CR) environments is generally modelled as a distributed binary hypothesis testing problem. However, modelling of the system in presence of correlated multipath-fading is an important issue. It deals with complex dependencies of large number of random variables. Earlier

Analysis and optimization of distributed random sensing order in cognitive radio networks
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Abstract:Developing an efficient spectrum access policy enables cognitive radios to dramatically increase spectrum utilization while ensuring predetermined quality of service levels for the primary users. In this paper, modeling, performance analysis, and

Efficient Spectrum Sensing and Testbed Development for Cognitive Radio Based Wireless Sensor Networks
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Abstract Problem of spectrum scarcity has not only affected cellular communication bands but is continuously pushing freely available ISM bands to its limits. Devices which work in ISM band were developed without the consideration of co-existence and interoperability.

Analysis of Spectrum Sensing By Using Energy Detection Technique in Cognitive Radio
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Abstract: In wireless technologies the importance of spectrum is rapidly increases hence traffic of spectrum is also increases day by day. However, it seems that the current technologies do not utilize the licensed spectrum bands efficiently (6). So, energy

End-to-End Authentication Protocols for Personal/Portable Devices over Cognitive RadioNetworks
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Abstract Recent Federal Communications Commission rules promise a whole new set of possible applications, which allow unlicensed use on a secondary basis of the Television White Spaces (TVWS), called as cognitive radio technology. ECMA-International launched Recently, cognitive radio has been proposed to improve the spectrum resource utilisation. In cognitive radio networks, the secondary (or unauthorised) users (SUs) are allowed to sense, detect and utilise the frequency bands that are not currently being used. Once the primary

Performance Analysis of Wireless Sensor Network Using Cognitive Radio Concept
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Abstract:As the demand for wireless increases there is rapid development of various wireless technologies. The users want to use wireless communication services anytime and anywhere. Wireless Sensor Networks (WSNs) are expected to play an important role in

Cognitive Radio for High Speed Railway through Dynamic and Opportunistic spectrum Reuse
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Abstract The integration of all the heterogeneous wireless networks deployed along European railway lines constitutes a key technical challenge to improve global efficiency of railway system. Emerging Cognitive Radio (CR) technologies can answer this challenge.

Multi-Mode Sub-Nyquist Rate D/A Converter for TV Band Cognitive Radio
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As the demand for high data-rate wireless and wide-range coverage of communications services increases rapidly, technologies to improve the flexibility and efficiency of spectrum utilization are becoming more significant. According to the spectrum measurement study

Joint Beamforming and Power Allocation Cognitive Radio Networks under Imperfect CSI
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Abstract 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 realistic systems. In this paper, the problem of joint

Spectrum Sensing for Cognitive Radio using Multicoset sampling
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Abstract:Spectrum sensing is the very task upon which the entire operation of Cognitive Radio rests. In this paper, we propose a spectrum sensing technique based on the estimates of the spectrum of a multiband signal obtained from its non-uniform compressed

An Algorithm for Spectrum Sensing in Cognitive Radio under Noise Uncertainty.
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Abstract With increasing demand of new wireless applications and increasing number of wireless user's problem of spectrum scarcity arises. Cognitive Radio technology supports dynamic spectrum access to address spectrum scarcity problem. Reliability of cognitive

Sensing-Throughput/Positioning Tradeoff in Indoor Cognitive Radio Networks
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Abstract:This paper evaluates the performance of indoor cognitive networks in terms of the throughput and the positioning, according to the spectrum sensing time. A better sensing quality can be obtained by using a longer sensing time. The better sensing quality of a

Centralized Dynamic Spectrum Access in Cognitive Radio Networks Based on Cooperative and Non-Cooperative Game
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Abstract: Cognitive radio (CR) can be presented as a new paradigm coming from the bad use of spectrum resources, the problem of static spectrum allocation produce disequilibrium.

Spectrum intelligence for interference mitigation for cognitive radio terminals
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ABSTRACT Cognitive Radio (CR) is defined as a radio that is aware of its surroundings and adapts intelligently. While CR technology is mainly cited as the enabler for solving the spectrum scarcity problems by the means of Dynamic Spectrum Access (DSA),

A Survey of Frameworks Open Environments Applied To Cognitive Radio Design
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Abstract:In modern societies, spectrum bands become very expensive and highly requested resources. Many applications based on wireless communications require smart collaboration and wise sharing of available resources. To achieve this goal, concepts of Cognitive radio networks (CRNs) are envisaged to solve the problem of spectrum scarcity, caused by the current spectrum allocation policy in which only licensed users have channel access rights. In CRNs, unlicensed users are allowed to opportunistically use the idle

Iterative Second-Order Moment-Based Spectrum Sensing Algorithm in a Cognitive RadioContext
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Abstract:This paper deals with a second-order moment-based spectrum sensing algorithm in a cognitive radio context. Based on a joint and iterative channel and noise variance estimator for OFDM systems, the method accurately estimates the noise variance when Cognitive radio networks (CRNs) have been considered as an attractive means to mitigate the spectrum scarcity issue that is expected to occur due to the increasing demand for wireless channel resources. In CRNs, unlicensed users can opportunistically access

MATCHED FILTER BASED SPECTRUM SENSING FOR COGNITIVE RADIO AT LOW SIGNAL TO NOISE RATIO
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ABSTRACT Custom usage of a Cognitive Radio is administrated by the essential utilization aspect of the radio spectrum the natural resource. Cognitive radio trying to resourcefully share the radio spectrum along with potential primary users in the spectrum that must be

Simulation analysis of modified filter bank multicarrier for physical layer cognitive radio under radio environment
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Abstract In the present day world of wireless communication scenario, some spectrum bands are highly utilized while many remain moderately utilized or rarely occupied. The cognitive radio is a new paradigm to overcome the persisting problem of spectrum underutilization.

POWER ALLOCATION SCHEMES FOR MIMO-OFDM BASED COGNITIVE RADIOSYSTEMS BASED ON WATER FILLING
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Abstract:The water filling algorithm provides solution with the help of channel state information. MIMO is a promising high data rate integrates technology. It is well known the aptitude of MIMO can be significantly enhanced by employing a proper power budget

Estimation of Channel State Transition Probabilities Based on Markov Chains in Cognitive Radio
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Abstract:Prediction of spectrum sensing and access is one of the keys in cognitive radio (CR). It is necessary to know the channel state transition probabilities to predict the spectrum. By the use of the model of partially observable Markov decision process (

Matched-Filter-based Spectrum Sensing for Secure Cognitive Radio Network Communications
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ABSTRACT The increasing demand for wireless communication introduces efficient spectrum utilization challenge. To address this challenge, Cognitive Radio (CR) has emerged as the key technology, which enables opportunistic access to the spectrum.

Estimation of Cost-based Channel Occupancy in Cognitive Radio Using Sequential Monte Carlo Methods
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ABSTRACT Dynamic channel selection in cognitive radio consists of two main phases. The first phase is spectrum sensing, during which the channels that are occupied by the primary users are detected. The second phase is channel selection, during which the state of the

Cognitive Radio And Dynamic Spectrum Access–A Study
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ABSTRACT A basic problem facing the future in wireless systems is where to find suitable spectrum bands to fulfill the demand of future services. While all of the radio spectrum is allocated to different services, applications and users, observation show that usage of the

Sensing Matrix Setting in Cognitive Radio Networks
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A Survey: On Routing Protocols in Cognitive Radio Ad Hoc Networks.
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Abstract-Ad-hoc routing protocols with cognitive capabilities have been proposed which solves the problem of spectrum scarcity. It does it by intelligently allowing the unlicensed devices to opportunistically communicate in the available licensed spectrum, while

Characterization of end-to-end path selection for cognitive radio wireless mesh networks
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Abstract: The Cognitive Radio (CR) can delivers the environment to Secondary Users (SUs) of Wireless Mesh Network (WMN) to utilize unused spectrum of Primary Users (PUs) opportunistically. The CR can improve the spectrum usage of the WMN. However, this An explosion of data traffic has been observed in cellular networks in recent years due to the booming growth of mobile applications. Various mobile applications, such as video streaming, document synchronization, and social networks, on such portable devices

A software framework for prioritized spectrum access in heterogeneous cognitive radionetworks
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Abstract Today, the radio spectrum is rarely fully utilized. This problem is valid in more domains, eg, time, frequency and geographical location. To provide an efficient utilization of the radio spectrum, the Cognitive Radio Networks (CRNs) have been advanced. The key

Implementation aspects in DFT modulated filter bank transceivers for cognitive radio
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Abstract: Discrete Fourier transform (DFT) modulated filter banks (FBs) are considered as strong tools used to implement both dynamic spectrum access and spectrum sensing in cognitive radio (CR) systems. High time-frequency (TF) resolution for spectral estimation

Real Time Video Streaming Transmission in Digital Oilfield with Cognitive Radio Networks Reconfiguration
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Abstract Digital Oilfield on the petroleum business is desired for real time oilfield data transmission with business drivers focusing information technology. In this paper, a high efficiency cross-layer cognitive radio networks management scheme with field wide

Adaptive Retry Time Based MAC Layer Spectrum Sensing for Cognitive Radio Networks
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ABSTRACT Spectrum sensing is an important issue for dynamic spectrum sharing in cognitive radio networks. The physical layer senses the availability of the primary users channels whereas the MAC layer decides how often, at which time duration and in which

Performance Evaluation Comparison of Primary User Signal Detection Methods for Cognitive Radio System
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Abstract: Utilization of electromagnetic radiofrequency spectrum with efficient way, we required to check the spectrum to determine whether it is being used by primary user (PU) or not. Research shows that the available spectrum is not utilized efficiently. The term

QoS Enhancement Techniques for Efficient VoIP Performance in Cognitive Radio Network
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Abstract: VoIP service demands strong QoS support for enhanced call quality and increased user satisfaction. Deploying VoIP in opportunistic communication models like cognitive radio requires thorough analysis of the factors involved in design and implementation. The

Random Matrix Theory Based Cognitive Radio Spectrum Sensing
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Abstract: A cognitive radio system allows higher data transmission rates due to the efficient spectrum utilization. Spectrum sensing plays a substantial role in such a cognition scenario. In this paper, a novel multiple antenna sensing algorithm is proposed for detecting the

Cooperative cognitive relaying protocol for an energy harvesting cognitive radio user
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Abstract:In this paper, we investigate the maximum secondary throughput of a saturated rechargeable secondary terminal sharing the spectrum with a primary terminal. The secondary transmitter (ST) harvests energy packets from the environment with a certain

Spectrum Leasing and Relay Selection in Multiuser Cooperative Cognitive Radio Networks.
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Abstract:In this paper, we consider multiple primary and multiple secondary users cooperative cognitive radio networks, in which the primary users (PUs) lease a portion of their spectrum to the secondary users (SUs) for some revenue, and in return the SUs play

An Enhanced Cooperative Spectrum Sensing with Wavelet Denoising and Softened Hard Decision for Cognitive Radio Networks
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Abstract Cognitive Radio (CR) is a novel technology that can improve the utilization efficiency of the radio spectrum and also address the spectrum scarcity problem by opportunistically using the unused channels (spectrum holes/white spaces) in the

Using Position Based and Cognitive Radio in Vehicular Ad-hoc Network
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Abstract:Over the last few years, VANETs have turned into an important research area. For the roadside equipment, Cognitive Radio protocol allocates multiple channels simultaneously to improve the delay incurred in an emergency situation, thereby providing In this paper we explore the possibility of using Energy-Division Multiple Access (EDMA) scheme for uplink communications in a cognitive radio context in order to allow transmission to unlicensed users overlapping with the primary user in both time and frequency domains

Cooperative Adaptive Threshold Based Energy and Matched Filter Detector in Cognitive Radio Networks
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Abstract: CR (cognitive radio) is the key technology for unlicensed SUs (secondary users) to exploit the unused spectrum of PUs (primary users) via opportunistic spectrum access. In this paper, we propose a new spectrum sensing method using cooperative adaptive

Fast and Distributed Power Control Algorithm in Underlay Cognitive Radio Networks.
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Abstract:The power allocation in an underlay cognitive radio network rises up several challenges due to rapid utilization of the available spectrum hole. In this paper, we propose a noncooperative power-game algorithm to solve the power allocation problem in an

EWA Selection Strategy with Channel Handoff Scheme in Cognitive Radio
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Abstract: This paper proposes an improved Experience-Weighted Attraction (EWA) selection algorithm with channel handoff scheme in order to meet the practical requirement for Cognitive Radio (CR) application. In further research, sensitivity and stability verification is

Spectrum Sensing, Access, and Leasing in Cognitive Radio Networks
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Abstract Cognitive radio has been considered as a promising way to deal with the overcrowded wireless spectrum. In cognitive radio, when licensed users (primary users) do not use their licensed spectrum, they may lease the spectrum to unlicensed users (

GROUP FORMATION SCHEME OF CELLS FOR BETTER SPECTRUM EFFICIENCY INCOGNITIVE RADIO NETWORK
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ABSTRACT A network is an interconnection of different users where different users exchange information with each other using transmitters and receivers. When the information are need to be transmitted automatically then in such cases cognitive radio

HASH TREE ALGORITHM FOR CENTRALIZED COGNITIVE RADIO NETWORKS
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ABSTRACT: Hash tree is a tree in which every non-leaf node is labeled with the hash of the labels of its children nodes. Hash trees are useful because they allow efficient and secure verification of the contents of larger data structures. Hash trees are a generalization of

Cross-layer Optimization in Cognitive Radio Cellular Networks with applications in Railway Sensing Systems
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Abstract In a cognitive radio cellular network (CogCell), primary users (PUs) rarely utilize all the assigned frequency bands in the given time period and the locations. The spectral inefficiency caused by the spectrum holes motivated cognitive radio technology (CR) that

Impact of Various Network Attacks on Time Synchronization in Cognitive Radio
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Abstract Time synchronization in CRNs is a demanding task due to the dynamic and cooperative nature of these networks. DCR-Sync, a novel time synchronization protocol for CRNs is proposed. DCR-Sync is fully distributed and resilient towards failure of root nodes

A Survey on Dynamic Spectrum Access via Cognitive Radio: Taxonomy, Requirements, and Benefits
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Abstract Conventionally, interference protection among radio spectrum users is guaranteed through a policy of spectrum licensing that provides exclusive access to licensed users. However, as it is becoming extremely difficult to satisfy the growing demand for radio

Security Challenges in Cognitive Radio Networks
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Abstract:Cognitive radio network (CRN) is an evolving concept aiming at more efficiently exploiting the available spectrum for opportunistic network usage. Deploying Cognitive Radio Networks raises several open issues and security concerns. CRNs suffer from both

Cognitive Radio Ad Hoc Networks
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Abstract: Emerging as a new communication paradigm, cooperative communication is attracting lot of attention among the researchers. In Cognitive Radio Ad Hoc Networks (CRAHN's), the relay selection with user cooperation could be advantageous to both

A COMPREHENSIVE STUDY OF SIGNAL DETECTION TECHNIQUES FOR SPECTRUM SENSING IN COGNITIVE RADIO
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ABSTRACT The radio frequency spectrum is a limited natural resource and it's getting crowded day by day due to massive entry of wireless services. Most spectrum bands are allotted to certain services but with insufficient spectrum resource utilization led to an

Sensing of Spectrum Holes in Cognitive Radio Networks: A Survey
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Abstract:Cognitive Radio (CR) has risen as a tempting solution to the problem of spectral inefficiency as it performs sensing of the radio environment, sharing it without harmful interference to Primary Users (PU) and quickly quitting the frequency band if the

Research of Spectrum Detecting Technology on Cognitive Radio
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Current wireless networks are characterized by a static spectrum allocation policy, the spectrum is assigned to the authorized users on a long-term. A number of experimental studies show that spectrum is used inefficiently both in space and time. With the rapid increase in wireless

A Spectrum Sensing Method Based on Gabor Transform for Cognitive Radio
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Abstract: In order to improve the sensing performance for cognitive radio, this paper proposes a spectrum sensing method based on Gabor transform. Firstly, a continuous-time signal is transformed into a discrete-time signal, then, the discrete-time signal is converted

VCG Mechanism Based Spectrum Allocation for Cognitive Radio Networks
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Abstract In this paper, we investigate spectrum allocation for underlay cognitive radio (CR) networks, where the CR users coexist but do not cause unacceptable interference with licensed users. For the purpose to find the optimal and load-balance assignment of

Spectrum Aware Mobility Management In Cognitive Radio-A Survey
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Abstract Cognitive radio (CR) enables the efficient utilization of the limited radio spectrum, network resources and an unlicensed user can communicate in licensed spectrum without interfering a licensed user. In CR expected to address several operational challenges

Opportunistic Spectrum Access in Cognitive Radio Ad Hoc Networks
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Abstract Cognitive Radio (CR) technology is envisaged to solve the problems in wireless networks resulting from the limited available spectrum and the inefficiency in the spectrum usage by exploiting the existing wireless spectrum opportunistically. CR networks,

An Energy Efficient Cognitive Radio System with Quantized Soft Sensing and Duration Analysis
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Abstract:In this paper, an energy efficient cognitive radio system is proposed. The proposed design optimizes the secondary user transmission power and the sensing duration combined with soft-sensing information to minimize the energy per goodbit. Due With the rapid development of wireless communication, the scarcity of spectrum becomes more and more prominent. Cognitive radio is proposed to overcome the problem of low spectrum utilisation by offering large bandwidth to mobile users via the dynamic spectrum

Impact of Primary User Emulation Attacks on Cognitive Radio Networks
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Abstract In this paper, we study the effects of Primary user emulation attacks (PUEA) in a cognitive radio network consisting of a single primary transmitter and a set of co-operating secondary or cognitive users. The primary transmitter communicates with primary

On the Optimality of Generic Rate-Based AIMD and AIAD Congestion Control Schemes inCognitive Radio Sensor Networks
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Abstract Investigating on the optimality and the modeling of congestion control schemes is crucial in order to provide quality of service (QoS) for various applications in cognitive radio sensor networks (CRSNs). This paper develops an analytical framework to study the

Efficient Spectrum Sensing Pattern Using Intelligent Matrix in Cognitive Radio Network
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Abstract Cognitive radio (CR) can successfully deal with the growing demand and scarcity of the wireless spectrum. To exploit limited spectrum efficiently, CR technology allows unlicensed users to access licensed spectrum bands. Since licensed users have priorities

Review paper on Cognitive Radio Networking and Communications
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Abstract-Cognitive radio (CR) is the enabling technology for supporting dynamic spectrum access: the policy that addresses the spectrum scarcity problem that is encountered in many countries. The spectrum sensing problem has gained new aspects with cognitive radio

Control Channel Allocation in Cognitive Radio Networks using Clustering
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Abstract:The static allocation schemes have led to the problem of spectrum under- utilization. In many bands, spectrum access is a more significant problem than physical scarcity of spectrum, in large part due to legacy command-and-control regulation that

Cognitive radio systems in the land mobile service
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This Report addresses cognitive radio systems (CRSs) in the land mobile service (LMS) above 30 MHz (excluding IMT). This Report presents the existing, emerging and potential applications employing CRS capabilities and the related enabling technologies, including

Spectrum Sharing Scheme using Cognitive Radio Networks Based on Channel Information.
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Abstract-An opportunistic spectrum sharing scheme for the secondary users co-existing with the primary users is proposed in this paper. This scheme is proposed to the secondary user in which the secondary user receives the signal from the primary user and then

Optimal power allocation and power constraint in OFDM-Based cognitive radio systems
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Abstract: Cognitive Radio (CR), which aims to improve spectrum utilization by accessing the spectrum originally licensed to a primary system, is a promising concept. In cognitive radio system based on orthogonal frequency division multiplexing (OFDM), the optimized

Dynamic Spectrum C0-Access (DSCA) With Dirty Paper (DPC) For Cognitive RadioNetworks
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Abstract: In the current architecture of dynamic spectrum access, which is also known as opportunistic spectrum access, secondary user can only access the spectrum when there is no existence of primary carrier. The resurgence of primary user compels the secondary

Spectrum Allocation Based on Simulated Annealing Genetic Algorithm in Cognitive RadioSystem
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Abstract In order to solve the problems of the traditional genetic algorithm fall into local optimal solution easily and the simulated annealing algorithm has large time cost, the hybrid algorithm of simulated annealing and genetic algorithm was introduced. In the hybrid

Supporting Trustworthy Cooperative Spectrum Sensing in Cognitive Radio Networks
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Abstract Cooperative spectrum sensing is recognized as an effective technology to improve the utilization of scarce radio spectrum resources. However, some secondary users (SUs) may be malicious, ie provide false sensing data, in an attempt to maximize their own utility

Demonstration of All-Spectrum Cognitive Channelization on GNU Radio and USRPN-210
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Abstract:We create new software signal processing blocks and provide transmitter and receiver designs in GNU Radio and MATLAB to experimentally demonstrate the theoretical concepts of all-spectrum cognitive channelization in a software-definedradio (SDR)-based

Study of Cognitive Radio Spectrum Sensing Algorithm Based on Compressed Sensing
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A Scheme to Counter SSDF Attacks based on Hard Decision in Cognitive Radio Networks
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Abstract:-Cognitive radio is a promising technology to improve the utilization of wireless spectrum resources. A serious threat to cognitive radio networks (CRN) which sense the spectrum in a cooperative manner is the transmission of false spectrum sensing data by

A Review of Dynamic Spectrum Networks Using Cognitive Radio
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Abstract:Future wireless networks are expected to be spectrum agile and use cognitive radio technologies. The spectrum regulatory committees have been taking measurable steps with regards to laying down the rules and implementing them, which will open the

Neighboring Group-based Control Channel Allocation for Cognitive Radio Mobile Ad Hoc Networks
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Abstract In Cognitive Radio Mobile Ad Hoc Networks (CR-MANETs), the heterogeneous and dynamic environment increases the complexity of control channel allocation (CCA). This paper considers the problem of CCA based on dynamic spectrum access opportunities.

Performance of User Selection in Cognitive Radio and Co-Channel Interference Environments
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Abstract In wireless networks, space diversity can be achieved through selecting among users while allocating channels to a group of users. This is known as multiuser Diversity (MUD). A lot of work has been conducted on the performance of such systems assuming

Multilayer Feedforward Neural Network Based Efficient Spectrum Occupancy Prediction Scheme for Cognitive Radio System
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Abstract Due to its opportunistic spectrum sharing capability, Cognitive Radio (CR) has been proposed as a fundamental solution to alleviate the contradiction between spectrum scarcity and inefficient utilization of licensed spectrum. In CR system, secondary users (SUs) are

Performance EvaluationBased on Energy Detection and Operational Interval of Spectrum Sensing In Cognitive Radio
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Abstract Cognitive radio is an intelligent communication system which focus on dynamic spectrum usage rather than fixed spectrum assignment. Cooperative spectrum sensing is a technique for detecting the primary user accurately based on information collected from

Towards Self-Configuration Techniques for Cognitive Radio Networks
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Summary Cognitive Radio Networks (CRN) are networks that can sense their operating environment and adapt their implementation to achieve the best performance. Therefore, a cognitive radio must dynamically configure and reconfigure itself under changing

Admission Control Using Stochastic Learning Games in Cognitive Radio Networks.
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Abstract A cognitive radio wireless network is an emerging communication paradigm to effectively address spectrum scarcity challenge. In this paper, we investigate the performance improvement gained by applying cognitive radio to a multiple Wireless

Spectrum Map and its Applications in Cognitive Radio Networks
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ABSTRACT Recent measurements on radio spectrum usage have revealed the abundance of underutilized bands of spectrum that belong to licensed users. This necessitated the paradigm shift from static to dynamic spectrum access. Cognitive radio based secondary A cognitive radio is a kind of two-way radio that automatically changes its transmission or reception parameters, in such a way that the entire wireless communication network of which it is a node communicates efficiently, while avoiding interference with licensed or unlicensed users. This alteration of parameters is based on the active monitoring of several factors in the external and internal radio environment, such as radio frequency spectrum, user behaviour and network state.