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radio frequency data communications
(384 results)-
Whitepapers
How the Consumerization of Technology Is Affecting Your IT Strategy
Feb 2013
For many reasons, you should be happy that a greater proportion of your user community now has their own smartphones, tablets, etc. Your company’s managers are also probably happy that these...
Provided by SkillSoft
-
White Papers
Understanding the Effects of Radio Frequency (RF) Interference on WLAN Performance and Security
Jul 2010
Wireless Local Area Networks (WLANs) based on the IEEE 802.11 standards have become the de-facto standard for wireless connectivity within buildings. These networks are commonly called Wi-Fi...
Provided by bandspeed
-
White Papers
Radio-Frequency Technologies for WSNs
Oct 2010
Many wireless monitoring and control applications are available for the industrial and home markets. Some hardware platforms are specialized for optimizing only one feature. However, the most...
Provided by Springer Science+Business Media
-
White Papers
Optical-Based COTS Data Communication Bus for Satellites
Sep 2008
COTS components are gathering more and more interest from satellite developers thanks to their lower cost and ease of procurement as compared to space qualified ones. A number of studies to...
Provided by Politecnico di Torino
-
White Papers
Data Commuinications Via Powerlines
Apr 2010
The hunger for increased bandwidth is driving individuals, corporations, and organizations to seek new methods for delivering Internet service to customers. Many of these methods are well known:...
Provided by National Security Agency
-
White Papers
Radio Frequency Identification (RFID) for Automating Business Processes
Dec 2007
The purpose of this white paper is to provide a brief explanation on Radio Frequency Identification (RFID) technologies, potential applications and some of RFID case studies. The paper will start...
Provided by GISdevelopment.net
-
White Papers
Study of Reliable Data Communication in Wireless Sensor Networks
Mar 2008
The technology of Wireless Sensor Networks (WSNs) is in the vanguard of the investigation of the computer networks and could be the next technologic market of a huge sum of money. An advance in...
Provided by VIT UNIVERSITY
-
White Papers
Performance Analysis of Free-Space Optical Systems in Gamma-Gamma Fading
Oct 2008
Atmospheric turbulence induced fading is one of the main impairments affecting Free-Space Optics (FSO). In recent years, Gamma-Gamma fading has become the dominant fading model for FSO links...
Provided by University of British Columbia
-
White Papers
Make the Right Choices for Your Smart Grid Communications Network
Jun 2010
It's no secret that the utility industry is moving to a smart grid. Most utilities have built pilots to test the capabilities of smart metering systems. Some have deployed it throughout their...
Provided by Verizon
-
White Papers
Investigating Simple Multipath Compensation for Frequency Modulated Signals at Lower Frequencies
Sep 2010
Radio propagation from point-to-point is affected by the physical channel in many ways. A signal arriving at a destination travels through a number of different paths which are referred to as...
Provided by Copperbelt University
-
White Papers
Cross Layer Aware Adaptive MAC Based on Knowledge Based Reasoning for Cognitive Radio Computer Networks
Jun 2010
In this paper the authors are proposing a new concept in MAC layer protocol design for Cognitive radio by combining information held by physical layer and MAC layer with analytical engine based on...
Provided by Academy & Industry Research Collaboration Center
-
White Papers
Analysis of Malicious Detection in Bluetooth Enabled Devices Exploiting Wireless Personal Area Networks
Apr 2010
The growing popularity of mobile devices (Smart phones, handsets, PDAs) along with 3G technology brings the mobile internet services on these devices. The wireless devices with messaging...
Provided by Global Journals
-
White Papers
Scattered Spectrum Sensing in Cognitive Radio Network
Dec 2010
Spectrum sensing is a key enabling functionality in Cognitive Radio (CR) networks, where the CRs act as secondary users that opportunistically access free frequency bands. Scattered Spectrum...
Provided by University of Engineering and Technology Taxila
-
White Papers
Implications of Radio Fingerprinting on the Security of Sensor Networks
Jun 2007
The authors demonstrate the feasibility of finger-printing the radio of wireless sensor nodes (Chipcon 1000 radio, 433MHz). The authors show that, with this type of devices, a receiver can create...
Provided by ETH Zurich
-
White Papers
Method for High Precision Clock Synchronization in Wireless Systems With Application to Radio
Jan 2009
In this paper the authors present a novel approach for high precision clock synchronization in wireless systems. A concept similar to the standard FMCW (Frequency-Modulated Continuous Wave) radar...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Smoothing Vehicular Traffic Flow With VGrid
Jul 2009
In this paper the authors explore a distributed application used to smooth traffic and reduce long term traffic incidents. To do this they use VGrid: An ad hoc networking and computing grid formed...
Provided by University of California
-
White Papers
Spectrum Sharing in Cognitive Radio Networks
Jan 2008
In this paper, the authors present a novel joint power/channel allocation scheme that uses a distributed pricing strategy to improve the network's performance. According to this scheme, the...
Provided by Institute of Electrical and Electronics Engineers
-
Whitepapers
A Survey of IEEE Standards Supporting Cognitive Radio and Dynamic Spectrum Access
Oct 2008
Standardization is key to the success of many technologies. Cognitive Radio (CR) is no exception. CR techniques are being applied in many different communications systems. They promise to improve...
Provided by Institute of Electrical & Electronic Engineers
-
White Papers
Effect of Human Presence on UWB Radiowave Propagation Within the Passenger Cabin of a Midsize Airliner
Sep 2009
The authors have characterized the effect of human presence on path gain and time dispersion over Ultra Wide Band (UWB) channels within the passenger cabin of a typical midsize airliner. They...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Realization of RF Distance Bounding
Jun 2010
One of the main obstacles for the wider deployment of radio (RF) distance bounding is the lack of platforms that implement these protocols. The authors address this problem and they build a...
Provided by ETH Zurich
-
White Papers
Distributed Uplink Resource Allocation in Cognitive Radio Networks - Part II: Equilibria and Algorithms for Joint Access Point Selection and Power Allocation
Feb 2011
The main objective of this two part paper is to formulate and address the problem of distributed uplink resource allocation in multi-carrier Cognitive Radio Networks (CRN) with multiple Access...
Provided by University of Virginia
-
White Papers
Joint Distributed Access Point Selection and Power Allocation in Cognitive Radio Networks
Feb 2011
Spectrum management has been identified as a crucial step towards enabling the technology of the Cognitive Radio Network (CRN). Most of the current works dealing with spectrum management in the...
Provided by University of Virginia
-
White Papers
Collaborative Spectrum Sensing From Sparse Observations Using Matrix Completion for Cognitive Radio Networks
Jan 2010
In cognitive radio, spectrum sensing is a key component to detect spectrum holes (i.e., channels not used by any primary users). Collaborative spectrum sensing among the cognitive radio nodes is...
Provided by University of Houston
-
White Papers
Dynamic Resource Allocation in Cognitive Radio Networks: A Convex Optimization Perspective
Jan 2010
This paper provides an overview of the state-of-art results on communication resource allocation over space, time, and frequency for emerging Cognitive Radio (CR) wireless networks. Focusing on...
Provided by Cornell University
-
White Papers
Asymptotic Scheduling Gains in Point-to-Multipoint Cognitive Networks
Jan 2010
The authors consider collocated primary and secondary networks that have simultaneous access to the same frequency bands. Particularly, they examine three different levels at which primary and...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
A Novel Algorithm for Cooperative Distributed Sequential Spectrum Sensing in Cognitive Radio
Oct 2010
Presently there is a scarcity of wireless spectrum worldwide due to an increase in wireless services. Cognitive Radios are proposed as a solution to this problem. They access the spectrum licensed...
Provided by Indian Institute of Science
-
White Papers
QoS-Aware Joint Policies in Cognitive Radio Networks
Oct 2010
One of the most challenging problems in Opportunistic Spectrum Access (OSA) is to design channel sensing-based protocol in multi Secondary Users (SUs) network. Quality of Service (QoS)...
Provided by Sharif University of Technology
-
White Papers
Theoretical Analysis of Cyclic Frequency Domain Noise and Feature Detection for Cognitive Radio Systems
Apr 2009
In cognitive radio systems, cyclostationary feature detection plays an important role in spectrum sensing, especially in low SNR cases. To configure the detection threshold under a certain noise...
Provided by Shanghai Jiao Tong University
-
White Papers
Performance of Cognitive Radio Systems With Imperfect Radio Environment Map Information
May 2009
In this paper the authors describe the effect of imperfections in the Radio Environment Map (REM) information on the performance of Cognitive Radio (CR) systems. Via simulations they explore the...
Provided by University of Canterbury
-
White Papers
Opportunistic Scheduling and Beamforming for MIMO-SDMA Downlink Systems With Linear Combining
Jun 2007
Opportunistic scheduling and beamforming schemes are proposed for multiuser MIMO-SDMA downlink systems with linear combining in this paper. Signals received from all antennas of each Mobile...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Multicast Scheduling With Cooperation and Network Coding in Cognitive Radio Networks
Dec 2009
Cognitive Radio Networks (CRNs) have recently emerged as a promising technology to improve spectrum utilization by allowing secondary users to dynamically access idle primary channels. As progress...
Provided by University of Toronto
-
White Papers
Broadcasting in Unreliable Radio Networks
Jun 2010
Practitioners agree that unreliable links, which fluctuate between working and not working, are an important characteristic of wireless networks. In contrast, most theoretical models of radio...
Provided by Massachusetts Institute of Technology
-
White Papers
Modeling Radio Networks
Jun 2009
The authors describe a modeling framework and collection of foundational composition results for the study of probabilistic distributed algorithms in synchronous radio networks. Existing results...
Provided by Massachusetts Institute of Technology
-
White Papers
Design and Analysis of Systems Based on RF Receivers With Multiple Carbon Nanotube Antennas
Jul 2010
In this paper, possible uses of systems composed of multiple CNT-based EM receivers are introduced and their communication-theoretical analysis developed. Four possible example applications that...
Provided by Ohio State University
-
White Papers
3D/2D Registration of Mapping Catheter Images for Arrhythmia Interventional Assistance
Jan 2010
RadioFrequency (RF) catheter ablation has transformed treatment for tachyarrhythmias and has become first-line therapy for some tachycardias. The precise localization of the arrhythmogenic site...
Provided by International Journal of Computer Science Issues
-
White Papers
Two Phase Spectrum Sharing for Frequency-Agile Radio Networks
Sep 2008
Modern frequency-agile radios are capable of dynamically changing the spectrum width and central frequency of its channels. Existing spectrum sharing algorithms often fail to exploit this...
Provided by Virginia Polytechnic Institute and State University
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White Papers
Distributed Antenna Systems Plus Software Radio: Range Extension and Other Benefits
Jun 2010
A Distributed Antenna System (DAS) breaks the traditional radio base station architecture into two pieces: a central processing facility and a set of distributed antennae connected to the central...
Provided by Vanu
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White Papers
Transmitter Precoding for ICI Reduction in Closed-Loop MIMO OFDM Systems
Dec 2009
The mitigation of InterCarrier Interference (ICI) in closed-loop Single-Input - Single-Output (SISO) and Multiple-Input - Multiple-Output (MIMO) Orthogonal Frequency-Division Multiplexing (OFDM)...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Joint Frequency Offset and Channel Estimation for OFDM Systems Using Pilot Symbols and Virtual Carriers
Dec 2009
The authors consider joint estimation of carrier frequency offset and Channel Impulse Response (CIR) for Orthogonal Frequency Division Multiplexing (OFDM) systems with pilot symbols and Virtual...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Semiblind Channel Estimation and Data Detection for OFDM Systems With Optimal Pilot Design
Dec 2009
This paper considers semiblind channel estimation and data detection for Orthogonal Frequency-Division Multiplexing (OFDM) over frequency-selective fading channels. The authors show that the...
Provided by Institute of Electrical and Electronics Engineers
-
Whitepapers
Implementation of Software-Defined Radio Using Lab VIEW
Jun 2012
A software-defined radio consists of a programmable communication system where functional changes can be made by merely updating software. In this paper, a software-defined radio 4-QAM (Quadrature...
Provided by International forum of researchers Students and Academician
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Whitepapers
A Spectrum Selection Framework for Mobility Handoff in Cognitive Radio Cellular Network
Nov 2012
Cognitive Radio (CR) offer solution by utilizing the spectrum holes in space without introducing an unacceptable fear of harmful interference for the primary user. And also solve the spectrum...
Provided by International Journal of Computer Applications
-
Whitepapers
LDPC-Coded OFDM Transmission Based on Adaptive Power Weights in Cognitive Radio Systems
Dec 2011
In this paper, the authors propose a new scheme to improve the performance of an LDPC-coded OFDM based Cognitive Radio (CR) link by applying adaptive power weights. To minimize estimation errors...
Provided by Scientific Research
-
Whitepapers
Radar Signal Recognition by CWD Picture Features
Apr 2012
In this paper, a system for automatic recognition of radar waveform is introduced. This technique is used in many spectrum management, surveillance and cognitive radio and radar applications. For...
Provided by Scientific Research
-
Whitepapers
Weighted Sum Rate Maximization in OFDM Based Cooperative Cognitive Radios: A Joint Optimization Approach
May 2012
Improving utilization of the radio spectrum is the main goal of Cognitive Radio Networks (CRN). Recent studies made use of cooperative relay technology in cognitive networks, to increase...
Provided by Scientific Research
-
Whitepapers
How the Consumerization of Technology Is Affecting Your IT Strategy
Feb 2013
For many reasons, you should be happy that a greater proportion of your user community now has their own smartphones, tablets, etc. Your company’s managers are also probably happy that these...
Provided by SkillSoft
-
eBooks
The future of software delivery is cloudy: Leveraging the cloud transform development and test
Jan 2013
Cloud technology is a terrific platform for a vast array of workloads. But what about cloud computing can actually help you transform your business? Read this ebook to learn the real-world...
Provided by IBM
-
Whitepapers
Signal Adaptive Hardware Design of a System for Highly Nonstationary FM Signal Estimation
Sep 2011
Multiple-clock-Cycle Implementation (MCI) of a signal adaptive optimal nonstationary filtering system is developed. The proposed design is based on the real-time results of time-frequency (TF)...
Provided by EURASIP
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Whitepapers
Review of Fractal Transform Based Image and Video Compression
Nov 2012
Fractal Compression is a new technique in the field of color and video compression. This technique has grabbed much attention in recent years because of very high compression ratio that can be...
Provided by International Journal of Computer Applications
-
Whitepapers
RF Propagation Analysis of MICAz Mote's Antenna with Ground Effect
Dec 2012
In this paper, the authors analyzed the Radio Frequency (RF) propagation characteristics of monopole antenna in MICAz mote. During the experimental analysis, two scenarios are considered. In...
Provided by Keio University
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Whitepapers
Underlay Cognitive Radios with Capacity Guarantees for Primary Users
Dec 2012
To use the spectrum efficiently, cognitive radios leverage knowledge of the Channel State Information (CSI) to optimize the performance of the Secondary Users (SUs) while limiting the interference...
Provided by Cornell University
-
Whitepapers
Efficient Spectrum Leasing via Centralized Control of a Random Secondary User Back Off
Dec 2009
In this paper, the authors have designed robust spectrum leasing solutions among N secondary users with a constraint on the total interference at a particular primary receiver (where robustness is...
Provided by Aalborg University
-
Whitepapers
A New Programmable RF System for System- On-Chip Applications
Apr 2011
This paper presents a new programmable Radio Frequency (RF) system for a System-on-Chip (SoC) transceiver. A 5-GHz low noise amplifier (LNA) is integrated with an on-chip programmable RF circuits...
Provided by Science and Development Network (SciDev.Net)
-
Whitepapers
A Survey of IEEE Standards Supporting Cognitive Radio and Dynamic Spectrum Access
Oct 2008
Standardization is key to the success of many technologies. Cognitive Radio (CR) is no exception. CR techniques are being applied in many different communications systems. They promise to improve...
Provided by Institute of Electrical & Electronic Engineers
-
White Papers
A Low Power Baseband Chain for CMMB Application
Nov 2008
This paper presents experimental results of an analog baseband circuit for China Multimedia Mobile Broadcasting (CMMB) direct conversion receiver in 0.35um SiGe BiCMOS process. It is the first...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
An Efficient Power Allocation Game for Cognitive Radio
Nov 2008
The authors study distributed power control for cognitive radio in this paper. The cognitive radio environment of multi-users is viewed as a non-cooperative game. In the condition of incomplete...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Analog Auto-Correlation Based Receiver Architecture for Radar Systems
Oct 2010
Analog signal processing based radar systems enable reduction in total system power consumption, over conventional digital signal processing based radar systems. In this paper, detection...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Design of New Minimum Decoding Complexity Quasi-Orthogonal Space-Time Block Code for Four Transmit Antennas
Nov 2008
A new Space-Time Block Code (STBC) achieving full rate and full diversity for general QAM and four transmit antennas is proposed. This code also possesses a Quasi-Orthogonal (QO) property like the...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
A New Hyperchaotic Sequence for DS-UWB Systems
Nov 2008
This paper proposes a novel hyperchaotic PN (Pseudo-Noise) sequence, which is generated by a novel Rossler hyperchaotic system. Its correlation characteristics are analyzed via numerical...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Antenna-in-Package Design for Wirebond Interconnection to Highly Integrated 60-GHz Radios
Feb 2010
This paper first presents a quasi-cavity-backed, guard-ring-directed, substrate-material-modulated slot antenna. The antenna, intended for use in highly integrated 60-GHz radios, is deliberately...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
On Achieving Marton's Region for Broadcast Channel Using Feedback
Dec 2010
The authors consider a two user Discrete Memoryless Broadcast Channel (DMBC) with perfect feedback from both the receivers. The best known achievable region for the general DMBC without feedback...
Provided by Indian Institute of Technology Bombay
-
White Papers
An Efficient Predistorter Design for Compensating Nonlinear Memory High Power Amplifiers
Nov 2011
This contribution applies digital predistorter to compensate distortions caused by memory High Power Amplifiers (HPAs) which exhibit true output saturation characteristics. Particle swarm...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Demonstration of an OLA-Based Cooperative Routing Protocol in an Indoor Environment
Jun 2011
Concurrent Cooperative Transmission (CCT) is a Cooperative Transmission (CT) technique, also known as distributed transmit diversity, where a collection of single-antenna nodes induce a...
Provided by Georgia Institute of Technology
-
White Papers
Residual White Space Distribution-Based Opportunistic Channel Access for Cognitive Radio Enabled Devices
Sep 2010
The authors describe an opportunistic channel access scheme for cognitive radio-enabled Secondary Nodes (SNs). The proposed scheme uses the residual channel idle time distribution to estimate the...
Provided by Association for Computing Machinery
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White Papers
Practical Signal Detection and Classification in GNU Radio
Aug 2007
This paper selects a number of effective, general methods for enabling signal detection, estimation, and classification needs for cognitive radio. Implementations of algorithms such as these are...
Provided by University of Texas
-
White Papers
Investigation of Complexity-Constrained Peformance of Planar REConfigurable APerture Antennas (RECAPs)
Jan 2010
A REConfigurable APerture (RECAP) antenna is a regular array of reconfigurable elements whose state can be changed dynamically. RECAPs have shown the potential to support many antenna operations...
Provided by Jacobs University Bremen
-
White Papers
Correlation-Based Sensing for Cognitive Radio Networks: Bounds and Experimental Assessment
Jul 2010
Minimal missed detection rate of primary users is critical for adoption of cognitive radio networks, underlining the need for robust collaborative sensing combined with near-optimal single node...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
An Efficient Algorithm for Cooperative Spectrum Sensing in Cognitive Radio Networks
Aug 2008
The authors consider the problem of Spectrum Sensing in Cognitive Radio Systems. They have developed a distributed algorithm that the Secondary users can run to sense the channel cooperatively. It...
Provided by Indian Institute of Science
-
White Papers
Cooperative Robust Sequential Detection Algorithms for Spectrum Sensing in Cognitive Radio
Aug 2009
The authors consider the problem of Spectrum Sensing in Cognitive Radio Networks. In their previous work, they have developed DualCUSUM, a distributed algorithm for change detection and used it...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Ring-Walk Based Channel-Hopping Algorithms With Guaranteed Rendezvous for Cognitive Radio Networks
Jan 2011
Rendezvous is a fundamental and essential operation for users of Cognitive Radio Networks (CRNs) to meet and establish a link on a common channel, so that information exchange and data...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
An Adaptive Quantization Algorithm for Secret Key Generation Using Radio Channel Measurements
Dec 2009
New approaches that generate secret keys from radio channel characteristics have been recently proposed. The security of these schemes usually relies on the reciprocity principle which states that...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Perturbation Analysis for Spectrum Sharing in Cognitive Radio Networks
Jun 2010
A primary ad-hoc network working in parallel with a secondary ad-hoc network is considered. The main challenge in operating cognitive ad-hoc networks is the lack of a centralized controller...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Decentralized Cognitive Radio Control Based on Inference From Primary Link Control Information
May 2010
This paper on cognitive radio access ventures beyond the more traditional "Listen-before-talk" paradigm that underlies many cognitive radio access proposals. The authors exploit the bi-directional...
Provided by UC Regents
-
White Papers
Attack Prevention for Collaborative Spectrum Sensing in Cognitive Radio Networks
Sep 2011
Collaborative spectrum sensing can significantly improve the detection performance of Secondary Unlicensed users (SUs). However, the performance of collaborative sensing is vulnerable to sensing...
Provided by Chinese University of Hong Kong
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White Papers
Simple Channel Sensing Order in Cognitive Radio Networks
Apr 2011
In Cognitive Radio Networks (CRNs), effective and efficient channel exploitation is imperative for unlicensed secondary users to seize available network resources and improve resource utilization....
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Benefits of Quadrature Baseband Versus Radio Frequency Demodulation Algorithm
Mar 2009
The continued advancement of Software-Defined Radio (SDR) technology has been a key factor furthering research into the implementation of most signal processing algorithms at baseband....
Provided by Copperbelt University
-
White Papers
Distributed Control and Signaling Using Cognitive Pilot Channels in a Centralized Cognitive Radio Network
Apr 2011
In this paper, a Cognitive Radio Network (CRN) model is presented. In this model, the control of the CRN is distributed among the frequency spectrum considered for transmission using Cognitive...
Provided by IARIA
-
White Papers
COSMIC: A Cooperative MAC Protocol for WSN With Minimal Control Messages
Oct 2010
Over the last decade cooperative communication in Wireless Sensor Networks (WSNs) received much attention. A lot of works have been done to propose a MAC layer that supports cooperative relaying....
Provided by France Telecom - Orange
-
White Papers
Channel Sensing Order for Cognitive Radio Networks Using Reinforcement Learning
Aug 2011
This paper investigates the problem of channel sensing order used by a cognitive multichannel network, where each user is able to perform primary user detection on only one channel at a time. The...
Provided by Universidade Federal do Rio de Janeiro
-
White Papers
Cognitive Satellite Terrestrial Radios
Jun 2011
In this paper the authors present the concept of Cognitive Satellite Terrestrial Radios (CSTR) for Hybrid Satellite-Terrestrial Systems (HSTSs). The Cognitive Radio (CR) technology is being...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
A Survey on MAC Protocols for Cognitive Radio Networks
Feb 2009
In Cognitive Radio (CR) networks, identifying the available spectrum resource through spectrum sensing, deciding on the optimal sensing and transmission times, and coordinating with the other...
Provided by Reed Elsevier
-
White Papers
Distributed Multiaccess in Hierarchical Cognitive Radio Networks
Jul 2011
The problem of distributed multiuser medium access of a hierarchical cognitive radio network with multiple primary and secondary users is considered. Each primary user has a licensed channel; it...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Spectrum Sensing Methods and Dynamic Spectrum Sharing in Cognitive Radio Networks: A Survey
Mar 2011
Dynamic spectrum access and Cognitive Radio (CR) are emerging technologies to utilize the scarce frequency spectrum in an efficient and opportunistic manner. They have been receiving tremendous...
Provided by Indiana University
-
White Papers
Understanding the Effects of Radio Frequency (RF) Interference on WLAN Performance and Security
Jul 2010
Wireless Local Area Networks (WLANs) based on the IEEE 802.11 standards have become the de-facto standard for wireless connectivity within buildings. These networks are commonly called Wi-Fi...
Provided by bandspeed
-
White Papers
Radio-Frequency Technologies for WSNs
Oct 2010
Many wireless monitoring and control applications are available for the industrial and home markets. Some hardware platforms are specialized for optimizing only one feature. However, the most...
Provided by Springer Science+Business Media
-
White Papers
Optical-Based COTS Data Communication Bus for Satellites
Sep 2008
COTS components are gathering more and more interest from satellite developers thanks to their lower cost and ease of procurement as compared to space qualified ones. A number of studies to...
Provided by Politecnico di Torino
-
White Papers
Data Commuinications Via Powerlines
Apr 2010
The hunger for increased bandwidth is driving individuals, corporations, and organizations to seek new methods for delivering Internet service to customers. Many of these methods are well known:...
Provided by National Security Agency
-
White Papers
Radio Frequency Identification (RFID) for Automating Business Processes
Dec 2007
The purpose of this white paper is to provide a brief explanation on Radio Frequency Identification (RFID) technologies, potential applications and some of RFID case studies. The paper will start...
Provided by GISdevelopment.net
-
White Papers
Study of Reliable Data Communication in Wireless Sensor Networks
Mar 2008
The technology of Wireless Sensor Networks (WSNs) is in the vanguard of the investigation of the computer networks and could be the next technologic market of a huge sum of money. An advance in...
Provided by VIT UNIVERSITY
-
White Papers
Performance Analysis of Free-Space Optical Systems in Gamma-Gamma Fading
Oct 2008
Atmospheric turbulence induced fading is one of the main impairments affecting Free-Space Optics (FSO). In recent years, Gamma-Gamma fading has become the dominant fading model for FSO links...
Provided by University of British Columbia
-
White Papers
Make the Right Choices for Your Smart Grid Communications Network
Jun 2010
It's no secret that the utility industry is moving to a smart grid. Most utilities have built pilots to test the capabilities of smart metering systems. Some have deployed it throughout their...
Provided by Verizon
-
White Papers
Investigating Simple Multipath Compensation for Frequency Modulated Signals at Lower Frequencies
Sep 2010
Radio propagation from point-to-point is affected by the physical channel in many ways. A signal arriving at a destination travels through a number of different paths which are referred to as...
Provided by Copperbelt University
-
White Papers
Cross Layer Aware Adaptive MAC Based on Knowledge Based Reasoning for Cognitive Radio Computer Networks
Jun 2010
In this paper the authors are proposing a new concept in MAC layer protocol design for Cognitive radio by combining information held by physical layer and MAC layer with analytical engine based on...
Provided by Academy & Industry Research Collaboration Center
-
White Papers
Analysis of Malicious Detection in Bluetooth Enabled Devices Exploiting Wireless Personal Area Networks
Apr 2010
The growing popularity of mobile devices (Smart phones, handsets, PDAs) along with 3G technology brings the mobile internet services on these devices. The wireless devices with messaging...
Provided by Global Journals
-
White Papers
Scattered Spectrum Sensing in Cognitive Radio Network
Dec 2010
Spectrum sensing is a key enabling functionality in Cognitive Radio (CR) networks, where the CRs act as secondary users that opportunistically access free frequency bands. Scattered Spectrum...
Provided by University of Engineering and Technology Taxila
-
White Papers
Implications of Radio Fingerprinting on the Security of Sensor Networks
Jun 2007
The authors demonstrate the feasibility of finger-printing the radio of wireless sensor nodes (Chipcon 1000 radio, 433MHz). The authors show that, with this type of devices, a receiver can create...
Provided by ETH Zurich
-
White Papers
Method for High Precision Clock Synchronization in Wireless Systems With Application to Radio
Jan 2009
In this paper the authors present a novel approach for high precision clock synchronization in wireless systems. A concept similar to the standard FMCW (Frequency-Modulated Continuous Wave) radar...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Smoothing Vehicular Traffic Flow With VGrid
Jul 2009
In this paper the authors explore a distributed application used to smooth traffic and reduce long term traffic incidents. To do this they use VGrid: An ad hoc networking and computing grid formed...
Provided by University of California
-
White Papers
Spectrum Sharing in Cognitive Radio Networks
Jan 2008
In this paper, the authors present a novel joint power/channel allocation scheme that uses a distributed pricing strategy to improve the network's performance. According to this scheme, the...
Provided by Institute of Electrical and Electronics Engineers
-
Whitepapers
A Survey of IEEE Standards Supporting Cognitive Radio and Dynamic Spectrum Access
Oct 2008
Standardization is key to the success of many technologies. Cognitive Radio (CR) is no exception. CR techniques are being applied in many different communications systems. They promise to improve...
Provided by Institute of Electrical & Electronic Engineers
-
White Papers
Effect of Human Presence on UWB Radiowave Propagation Within the Passenger Cabin of a Midsize Airliner
Sep 2009
The authors have characterized the effect of human presence on path gain and time dispersion over Ultra Wide Band (UWB) channels within the passenger cabin of a typical midsize airliner. They...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Realization of RF Distance Bounding
Jun 2010
One of the main obstacles for the wider deployment of radio (RF) distance bounding is the lack of platforms that implement these protocols. The authors address this problem and they build a...
Provided by ETH Zurich
-
White Papers
Distributed Uplink Resource Allocation in Cognitive Radio Networks - Part II: Equilibria and Algorithms for Joint Access Point Selection and Power Allocation
Feb 2011
The main objective of this two part paper is to formulate and address the problem of distributed uplink resource allocation in multi-carrier Cognitive Radio Networks (CRN) with multiple Access...
Provided by University of Virginia
-
White Papers
Joint Distributed Access Point Selection and Power Allocation in Cognitive Radio Networks
Feb 2011
Spectrum management has been identified as a crucial step towards enabling the technology of the Cognitive Radio Network (CRN). Most of the current works dealing with spectrum management in the...
Provided by University of Virginia
-
White Papers
Collaborative Spectrum Sensing From Sparse Observations Using Matrix Completion for Cognitive Radio Networks
Jan 2010
In cognitive radio, spectrum sensing is a key component to detect spectrum holes (i.e., channels not used by any primary users). Collaborative spectrum sensing among the cognitive radio nodes is...
Provided by University of Houston
-
White Papers
Dynamic Resource Allocation in Cognitive Radio Networks: A Convex Optimization Perspective
Jan 2010
This paper provides an overview of the state-of-art results on communication resource allocation over space, time, and frequency for emerging Cognitive Radio (CR) wireless networks. Focusing on...
Provided by Cornell University
-
White Papers
Asymptotic Scheduling Gains in Point-to-Multipoint Cognitive Networks
Jan 2010
The authors consider collocated primary and secondary networks that have simultaneous access to the same frequency bands. Particularly, they examine three different levels at which primary and...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
A Novel Algorithm for Cooperative Distributed Sequential Spectrum Sensing in Cognitive Radio
Oct 2010
Presently there is a scarcity of wireless spectrum worldwide due to an increase in wireless services. Cognitive Radios are proposed as a solution to this problem. They access the spectrum licensed...
Provided by Indian Institute of Science
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White Papers
QoS-Aware Joint Policies in Cognitive Radio Networks
Oct 2010
One of the most challenging problems in Opportunistic Spectrum Access (OSA) is to design channel sensing-based protocol in multi Secondary Users (SUs) network. Quality of Service (QoS)...
Provided by Sharif University of Technology
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White Papers
Theoretical Analysis of Cyclic Frequency Domain Noise and Feature Detection for Cognitive Radio Systems
Apr 2009
In cognitive radio systems, cyclostationary feature detection plays an important role in spectrum sensing, especially in low SNR cases. To configure the detection threshold under a certain noise...
Provided by Shanghai Jiao Tong University
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White Papers
Performance of Cognitive Radio Systems With Imperfect Radio Environment Map Information
May 2009
In this paper the authors describe the effect of imperfections in the Radio Environment Map (REM) information on the performance of Cognitive Radio (CR) systems. Via simulations they explore the...
Provided by University of Canterbury
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White Papers
Opportunistic Scheduling and Beamforming for MIMO-SDMA Downlink Systems With Linear Combining
Jun 2007
Opportunistic scheduling and beamforming schemes are proposed for multiuser MIMO-SDMA downlink systems with linear combining in this paper. Signals received from all antennas of each Mobile...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Multicast Scheduling With Cooperation and Network Coding in Cognitive Radio Networks
Dec 2009
Cognitive Radio Networks (CRNs) have recently emerged as a promising technology to improve spectrum utilization by allowing secondary users to dynamically access idle primary channels. As progress...
Provided by University of Toronto
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White Papers
Broadcasting in Unreliable Radio Networks
Jun 2010
Practitioners agree that unreliable links, which fluctuate between working and not working, are an important characteristic of wireless networks. In contrast, most theoretical models of radio...
Provided by Massachusetts Institute of Technology
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White Papers
Modeling Radio Networks
Jun 2009
The authors describe a modeling framework and collection of foundational composition results for the study of probabilistic distributed algorithms in synchronous radio networks. Existing results...
Provided by Massachusetts Institute of Technology
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White Papers
Design and Analysis of Systems Based on RF Receivers With Multiple Carbon Nanotube Antennas
Jul 2010
In this paper, possible uses of systems composed of multiple CNT-based EM receivers are introduced and their communication-theoretical analysis developed. Four possible example applications that...
Provided by Ohio State University
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White Papers
3D/2D Registration of Mapping Catheter Images for Arrhythmia Interventional Assistance
Jan 2010
RadioFrequency (RF) catheter ablation has transformed treatment for tachyarrhythmias and has become first-line therapy for some tachycardias. The precise localization of the arrhythmogenic site...
Provided by International Journal of Computer Science Issues
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White Papers
Two Phase Spectrum Sharing for Frequency-Agile Radio Networks
Sep 2008
Modern frequency-agile radios are capable of dynamically changing the spectrum width and central frequency of its channels. Existing spectrum sharing algorithms often fail to exploit this...
Provided by Virginia Polytechnic Institute and State University
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White Papers
Distributed Antenna Systems Plus Software Radio: Range Extension and Other Benefits
Jun 2010
A Distributed Antenna System (DAS) breaks the traditional radio base station architecture into two pieces: a central processing facility and a set of distributed antennae connected to the central...
Provided by Vanu
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White Papers
Transmitter Precoding for ICI Reduction in Closed-Loop MIMO OFDM Systems
Dec 2009
The mitigation of InterCarrier Interference (ICI) in closed-loop Single-Input - Single-Output (SISO) and Multiple-Input - Multiple-Output (MIMO) Orthogonal Frequency-Division Multiplexing (OFDM)...
Provided by Institute of Electrical and Electronics Engineers
