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cellular mobile radio systems
(104 results)-
White Papers
Energy Efficiency Improvements Through Micro Sites in Cellular Mobile Radio Networks
Sep 2009
Efforts to increase the energy efficiency of information and communication systems in general and cellular mobile radio networks in particular have recently gained momentum. Besides positive...
Provided by Dresden University of Technology
-
White Papers
Traffic Demand and Energy Efficiency in Heterogeneous Cellular Mobile Radio Networks
Feb 2010
Optimization of the energy efficiency is considered not only to positively contribute to the ecological assessment, but gains in importance from operator's point of view as well, since energy...
Provided by Dresden University of Technology
-
White Papers
Estimation of a Probability of Interference in a Cellular Communication Network Using the Monte-Carlo Technique
Jul 2009
A Monte-Carlo technique based methodology for the estimation of a probability of interference in a cellular communication network is presented. This probability is considered for the case of...
Provided by University of Swaziland
-
White Papers
A Study on Cellular CDMA-Based for New Generation Mobile Radio System
Feb 2010
As the networks improve and new demands for rapid data transfer rates and multimedia services grow, operators are seeking new cellular communication solutions based on technologies like GSM, 3GSM...
Provided by Journal of Theoretical and Applied Information Technology
-
White Papers
Public Safety Land Mobile Radio Cyber and Information Assurance
Oct 2010
The importance of Cyber Security (CS) for public safety mission critical Land Mobile Radio (LMR) Systems has only recently gained the attention of the market. It is just now beginning to be...
Provided by Harris
-
White Papers
Issues in Deploying Smart Antennas in Mobile Radio Networks
Jun 2009
With the exponentially increasing demand for wireless communications the capacity of current cellular systems will soon become incapable of handling the growing traffic. Since radio frequencies...
Provided by University of Pune
-
White Papers
Emulation of Radio Access Networks to Facilitate the Development of Distributed Applications
Jan 2008
Emulation of Radio Access Networks is a valuable tool for the development of distributed applications incorporating mobile terminals. The network simulator ns - 2 provides mechanisms to route live...
Provided by Academy Publisher
-
White Papers
Low-Power LFSR Kernel Architecture in Mobile Transmitter and Receiver Protocols and Software Defined Radios
Nov 2009
The LFSR operations are performed in implementing the different mobile-device protocols and encryption standards during transmission and reception. These operations are performed at the PN coding...
Provided by Academy Publisher
-
White Papers
Routing Metrics for Multi-Radio Wireless Mesh Networks
Aug 2007
Multi-radio wireless mesh networks provide a great improvement over traditional mobile ad-hoc networks and are able to provide increased capacity and scalability. Routing metrics for multi-radio...
Provided by University of Queensland
-
White Papers
Optimal Spectrum Sharing for Multi-Hop Software Defined Radio Networks
Mar 2008
Software Defined Radio (SDR) capitalizes advances in signal processing and radio technology and is capable of reconfiguring RF and switching to desired frequency bands. It is a frequency-agile...
Provided by Virginia Tech
-
White Papers
Distributed Cross-Layer Optimization for Cognitive Radio Networks
Jul 2010
This paper presents a distributed cross-layer optimization algorithm for a multi-hop cognitive radio network, with the objective of maximizing data rates for a set of user communication sessions....
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
On the Throughput of MIMO-Empowered Multi-Hop Cognitive Radio Networks
Dec 2010
Cognitive Radio (CR) and Multiple-Input Multiple-Output (MIMO) are two independent physical layer technologies that have made significant impact on wireless networking. CR operates on the...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Efficient Resource Allocation With Flexible Channel Cooperation in OFDMA Cognitive Radio Networks
Dec 2009
Recently, a cooperative paradigm for single-channel cognitive radio networks has been advocated, where primary users can leverage secondary users to relay their traffic. However, it is not clear...
Provided by University of Toronto
-
White Papers
Cognitive Radio Enabled Multi-Channel Access for Vehicular Communications
May 2010
The IEEE 1609.4 standard has been proposed to provide multi-channel operations in Wireless Access for Vehicular Environments (WAVE), where all the channels are periodically synchronized into...
Provided by University of California
-
White Papers
Distributed Spectrum Sharing for Video Streaming in Cognitive Radio Ad Hoc Networks
Aug 2009
A distributed joint routing and spectrum sharing algorithm for video streaming applications over cognitive radio ad hoc networks is proposed in this paper. The proposed cross-layer control scheme...
Provided by University at Buffalo
-
White Papers
Distributed and Provably-Efficient Algorithms for Joint Channel-Assignment, Scheduling and Routing in Multi-Channel Ad Hoc Wireless Networks
Jan 2011
The capacity of ad hoc wireless networks can be substantially increased by equipping each network node with multiple radio interfaces that can operate on multiple non-overlapping channels....
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Binary Inference for Primary User Separation in Cognitive Radio Networks
Dec 2010
Spectrum sensing receives much attention recently in the Cognitive Radio (CR) network research, i.e., Secondary Users (SUs) constantly monitor channel condition to detect the presence of the...
Provided by University of Houston
-
White Papers
Exploiting Multi-Antennas for Opportunistic Spectrum Sharing in Cognitive Radio Networks
Nov 2007
In Cognitive Radio (CR) networks, there are scenarios where the secondary (lower priority) users intend to communicate with each other by opportunistically utilizing the transmit spectrum...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Fast Cycle Frequency Domain Feature Detection for Cognitive Radio Systems
Mar 2009
In cognitive radio systems, one of the main requirements is to detect the presence of the primary users' transmission, especially in weak signal cases. Cyclostationary detection is always used to...
Provided by Shanghai Jiao Tong University
-
White Papers
On Oligopoly Spectrum Allocation Game in Cognitive Radio Networks With Capacity Constraints
Jun 2009
Dynamic spectrum sharing is a promising technology to improve spectrum utilization in the future wireless networks. The flexible spectrum management provides new opportunities for licensed primary...
Provided by Chinese University of Hong Kong
-
White Papers
Design of Learning Based MIMO Cognitive Radio Systems
May 2009
This paper addresses the design issues of the multi-antenna-based Cognitive Radio (CR) system that is able to operate concurrently with the licensed Primary Radio (PR) system. The authors propose...
Provided by Jacobs University Bremen
-
White Papers
Efficient Batch Update of Unique Identifiers in a Distributed Hash Table for Resources in a Mobile Host
Jun 2010
Resources in a distributed system can be identified using identifiers based on random numbers. When using a distributed hash table to resolve such identifiers to network locations, the...
Provided by Cornell University
-
White Papers
From Spectrum Pooling to Space Pooling: Opportunistic Interference Alignment in MIMO Cognitive Networks
Dec 2009
The authors describe a non-cooperative Interference Alignment (IA) technique which allows an opportunistic Multiple Input Multiple Output (MIMO) link (secondary) to harmlessly coexist with another...
Provided by Massachusetts Institute of Technology
-
White Papers
Detecting Primary Signals Using Time and Space Model
May 2008
The advantage of using cognitive radio technology is its ability to adapt and behave to the needs of the application. The adaptability to the application leads cognitive radios with the potential...
Provided by Grambling State University
-
White Papers
Defense Against Primary User Emulation Attacks in Cognitive Radio Networks
Nov 2007
Cognitive Radio (CR) is a promising technology that can alleviate the spectrum shortage problem by enabling unlicensed users equipped with CRs to coexist with incumbent users in licensed spectrum...
Provided by Virginia Polytechnic Institute and State University
-
White Papers
A Multipath Routing and Spectrum Access (MRSA) Framework for Cognitive Radio Systems in Multi-Radio Mesh Networks
Sep 2009
Cognitive Radio (CR) techniques to dynamically utilize the frequency spectrum are under hot discussion recently. In particular, wireless mesh networks along with CR techniques may play a vital...
Provided by Association for Computing Machinery
-
White Papers
TCP Improvement in Multi-Radio Multi-Channel Multi-Hop Networks
Dec 2008
In this paper, the authors seek to enhance the poor performance of original TCP in wireless multi-hop environments due to the intra-flow contention between TCP-DATA and TCP-ACK packets. Assuming...
Provided by Association for Computing Machinery
-
White Papers
A Femtocell-Based Testbed for Evaluating Future Cellular Networks
May 2008
This paper argues that the network community needs research testbeds for cellular wireless networks, and introduces a femtocell-based testbed, dubbed Cell-Lab, which is currently being developed...
Provided by Seoul National University
-
White Papers
Identifying Dynamic Network Modules With Temporal and Spatial Constraints
Sep 2008
Despite the rapid accumulation of systems-level biological data, understanding the dynamic nature of cellular activity remains a difficult task. The reason is that most biological data are static,...
Provided by University of Southern California
-
White Papers
Cooperative Communications for Cognitive Radio Networks
Jun 2007
Cognitive radio is observed as a novel approach, which could cope with the spectral limitations. This approach is designed to detect whether a particular segment of the radio spectrum is currently...
Provided by Hong Kong University of Science and Technology
-
Whitepapers
Cognitive Access Policies Under a Primary ARQ Process via Forward-Backward Interference Cancellation
Nov 2012
This paper introduces a novel technique for access by a cognitive Secondary User (SU) using best-effort transmission to a spectrum with an incumbent Primary User (PU), which uses Type-I Hybrid...
Provided by Aalborg University
-
Whitepapers
Pilot Design for Non-Contiguous Spectrum Usage in OFDM-Based Cognitive Radio Networks
Aug 2012
This paper, challenges regarding the provision of Channel State Information (CSI) in Non-Contiguous Orthogonal Frequency Division Multiplexing (NC-OFDM) and Cognitive Radio (CR) systems are...
Provided by EURASIP
-
Whitepapers
Globally Optimal Precoder Design With Finite-Alphabet Inputs for Cognitive Radio Networks
Nov 2012
This paper investigates the linear pre-coder design for spectrum sharing in multi-antenna cognitive radio networks with finite alphabet inputs. It formulates the pre-coding problem by maximizing...
Provided by Institute of Electrical & Electronic Engineers
-
Whitepapers
Analysis of Channel Estimation Imperfections within the 3GPP LTE Physical Layer
Sep 2011
This paper aims the investigation of radio link performance of the 3GPP LTE in terms of the bit- and block error rate, assuming different error models for the feedback of the channel state...
Provided by Budapest University of Technology and Economics
-
Whitepapers
Increasing Sum-Rate in Large-Scale Cognitive Radio Networks by Centralized Power and Spectrum Allocation
Dec 2012
The authors revisit the widely investigated problem of maximizing the centralized sum-rate capacity in a cognitive radio network. They consider an interference-limited multi-user multi-channel...
Provided by EURASIP
-
Whitepapers
Joint Optimization of Detection Threshold and Resource Allocation in Infrastructure-Based Multi-Band Cognitive Radio Networks
Nov 2012
Consider an infrastructure-based multi-band Cognitive Radio Network (CRN) where Secondary Users (SUs) opportunistically access a set of sub-carriers when sensed as idle. The carrier sensing...
Provided by EURASIP
-
Whitepapers
Distributed Execution of Cognitive Relaying with Time Incentive: Multiple PU Scenario
Nov 2012
This paper deals in developing distributed algorithms for Cognitive Relaying with Time Incentive for Multiple primary users (CRTI-M). CRTI-M is a symbiotic paradigm in which the incumbent Primary...
Provided by EURASIP
-
Whitepapers
On the Reusage of Primary Radio Resources Through the Exploitation of the Spatiotemporal Robustness of the MIMO Transmissions
Aug 2012
The spatiotemporal robustness of the MIMO transmissions is exploited aiming at inducing opportunistic secondary communications on the primary radio resources. The proposed model makes use of the...
Provided by Hindawi Publishing
-
Whitepapers
Relay Based Cooperative Spectrum Sensing in Cognitive Radio Networks Over Nakagami Fading Channels
Apr 2012
In this paper, the authors address the issue of cooperative spectrum sensing in cognitive radio networks. Here relay stations are introduced in cognitive radio network. In the proposed research,...
Provided by International Journal of Multidisciplinary Sciences and Engineering (IJMSE)
-
Whitepapers
Design of Spectrum Sensing Policy for Multi-User Multi-Band Cognitive Radio Network
Sep 2012
Finding an optimal sensing policy for a particular access policy and sensing scheme is a laborious combinatorial problem that requires the system model parameters to be known. In practice the...
Provided by Aalto University
-
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
Performance Bounds of Energy Detection With Signal Uncertainty in Cognitive Radio Networks
Dec 2012
The harmonic coexistence of Secondary Users (SUs) and Primary Users (PUs) in cognitive radio networks requires SUs to identify the idle spectrum bands. One common approach to achieve spectrum...
Provided by University of Washington School of Public Health & Community Medicine
-
Whitepapers
In-Building Radio Propagation at 900MHz in Multi Storied Building
Nov 2011
The proliferation of PCS has necessitated the complete characterization of radio channels existing inside buildings. The indoor radio channel differs from the conventional mobile radio channel in...
Provided by Academy & Industry Research Collaboration Center
-
Whitepapers
Comparison of Radio Resource Management in GSM
Nov 2011
As the stipulate for wireless communication has been mounting hurriedly, resourceful management of radio spectrum becomes very imperative. Channels are derisory and hence must be utilized...
Provided by Academy & Industry Research Collaboration Center
-
Whitepapers
Optimal Admission Control of Secondary Users in Preemptive Cognitive Radio Networks
Apr 2012
The authors study optimal admission control of Secondary Users (SUs) in Cognitive Radio (CR) networks in presence of preemption. In this model, when a Primary User (PU) arrives to the system and...
Provided by Boston University
-
Whitepapers
Imitation-Based Spectrum Access Policy for Cognitive Radio Networks
Jun 2012
In this paper, the authors tackle the problem of opportunistic spectrum access in cognitive radio networks. They consider a large number of unlicensed Secondary Users (SU) accessing a number of...
Provided by Telecom of New Zealand
-
Whitepapers
Design of a Wireless Multi-Radio-Frequency Channels Inspection System for Bridges
Oct 2012
This paper presents a Wireless Multi-radio-frequency Channels Inspection System (WMCIS) based on Wireless Sensor Networks (WSN) for the sake of bridge structural vibration inspection. The designed...
Provided by Hindawi Publishing
-
Whitepapers
Multipath Detection Using Boolean Satisfiability Techniques
Sep 2011
A new technique for multipath detection in wideband mobile radio systems is presented. The proposed scheme is based on an intelligent search algorithm using Boolean SATisfiability (SAT) techniques...
Provided by Hindawi Publishing
-
Whitepapers
Optimal Pricing Effect on Equilibrium Behaviors of Delay-Sensitive Users in Cognitive Radio Networks
Dec 2012
This paper studies price-based spectrum access control in cognitive radio networks, which characterizes network operators' service provisions to delay-sensitive Secondary Users (SUs) via pricing...
Provided by Institute of Electrical and Electronics Engineers
-
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
-
Whitepapers
Symbiotic Cognitive Relaying with Mobile Secondary Nodes in Cognitive Radio Networks
Dec 2012
In a Symbiotic Cognitive Relaying (SCR) scenario, Secondary User (SU) nodes can act as multi-hop relays to assist communication between Primary User (PU) nodes in the case of a weak direct link....
Provided by Indian Institute of Technology Bombay
-
Whitepapers
Design of Spectrum Sensing Policy for Multi-User Multi-Band Cognitive Radio Network
Sep 2012
Finding an optimal sensing policy for a particular access policy and sensing scheme is a laborious combinatorial problem that requires the system model parameters to be known. In practice the...
Provided by Aalto University
-
Whitepapers
Relay Based Cooperative Spectrum Sensing in Cognitive Radio Networks Over Nakagami Fading Channels
Apr 2012
In this paper, the authors address the issue of cooperative spectrum sensing in cognitive radio networks. Here relay stations are introduced in cognitive radio network. In the proposed research,...
Provided by International Journal of Multidisciplinary Sciences and Engineering (IJMSE)
-
Whitepapers
On the Reusage of Primary Radio Resources Through the Exploitation of the Spatiotemporal Robustness of the MIMO Transmissions
Aug 2012
The spatiotemporal robustness of the MIMO transmissions is exploited aiming at inducing opportunistic secondary communications on the primary radio resources. The proposed model makes use of the...
Provided by Hindawi Publishing
-
Whitepapers
Distributed Execution of Cognitive Relaying with Time Incentive: Multiple PU Scenario
Nov 2012
This paper deals in developing distributed algorithms for Cognitive Relaying with Time Incentive for Multiple primary users (CRTI-M). CRTI-M is a symbiotic paradigm in which the incumbent Primary...
Provided by EURASIP
-
Whitepapers
Joint Optimization of Detection Threshold and Resource Allocation in Infrastructure-Based Multi-Band Cognitive Radio Networks
Nov 2012
Consider an infrastructure-based multi-band Cognitive Radio Network (CRN) where Secondary Users (SUs) opportunistically access a set of sub-carriers when sensed as idle. The carrier sensing...
Provided by EURASIP
-
Whitepapers
Increasing Sum-Rate in Large-Scale Cognitive Radio Networks by Centralized Power and Spectrum Allocation
Dec 2012
The authors revisit the widely investigated problem of maximizing the centralized sum-rate capacity in a cognitive radio network. They consider an interference-limited multi-user multi-channel...
Provided by EURASIP
-
Whitepapers
Analysis of Channel Estimation Imperfections within the 3GPP LTE Physical Layer
Sep 2011
This paper aims the investigation of radio link performance of the 3GPP LTE in terms of the bit- and block error rate, assuming different error models for the feedback of the channel state...
Provided by Budapest University of Technology and Economics
-
Whitepapers
Globally Optimal Precoder Design With Finite-Alphabet Inputs for Cognitive Radio Networks
Nov 2012
This paper investigates the linear pre-coder design for spectrum sharing in multi-antenna cognitive radio networks with finite alphabet inputs. It formulates the pre-coding problem by maximizing...
Provided by Institute of Electrical & Electronic Engineers
-
Whitepapers
Pilot Design for Non-Contiguous Spectrum Usage in OFDM-Based Cognitive Radio Networks
Aug 2012
This paper, challenges regarding the provision of Channel State Information (CSI) in Non-Contiguous Orthogonal Frequency Division Multiplexing (NC-OFDM) and Cognitive Radio (CR) systems are...
Provided by EURASIP
-
Whitepapers
Cognitive Access Policies Under a Primary ARQ Process via Forward-Backward Interference Cancellation
Nov 2012
This paper introduces a novel technique for access by a cognitive Secondary User (SU) using best-effort transmission to a spectrum with an incumbent Primary User (PU), which uses Type-I Hybrid...
Provided by Aalborg University
-
White Papers
Link Throughput of Multi-Channel Opportunistic Access With Limited Sensing
Apr 2010
The authors aim to characterize the maximum link throughput of a multi-channel opportunistic communication system. The states of these channels evolve as independent and identically distributed...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Separation Principle for Opportunistic Spectrum Access in Unslotted Primary Systems
Apr 2010
The authors consider the design of Opportunistic Spectrum Access (OSA) strategies that allow secondary users to search for and exploit spectrum opportunities in unslotted primary systems. They...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Digital and Dynamic Certification in the Framework of the Novel Revised R&TTE Directive in Europe
Apr 2011
The next revision of the R&TTE Directive, which represents the basic regulatory framework for wireless communication in Europe, is expected to be finalized in 2011. In particular, this new...
Provided by Infineon Technologies
-
White Papers
An Efficient Power Control Algorithm for Supporting Cognitive Communications in Shared Spectrum Areas
Nov 2010
The concept of Cognitive Radio (CR) is meant to be utilised by both licensed and license-exempt users that coexist in a shared spectrum area whenever they need to avoid causing unaffordable...
Provided by Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering
-
White Papers
Hardware Optimized Sample Rate Conversion for Software Defined Radio
Dec 2010
The evolution towards applications with increasing functionalities leads to the need of high flexible systems that support a high number of different standards while decreasing the required...
Provided by EURECOM
-
White Papers
Dual-Observation Time-Division Spectrum Sensing for Cognitive Radios
Oct 2011
The hidden terminal problem of spectrum sensing in dynamic spectrum access is traditionally alleviated by cooperative sensing using multiple Cognitive Radio (CR) sensors. In this paper, the...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Performance Bounds for a Cognitive Radio Network With Network Calculus Analysis
Oct 2010
In this paper, the authors use stochastic network calculus to analyze the performance bounds for a cognitive radio network with two classes of input traffic. First, stochastic service curves for...
Provided by Norwegian University of Science and Technology
-
White Papers
Performance Analysis of a Cognitive Radio Network With Imperfect Spectrum Sensing
Jan 2010
In this paper, the authors use stochastic network calculus to analyze a cognitive radio network, where influences of imperfect spectrum sensing and different retransmission schemes are considered....
Provided by Norwegian University of Science and Technology
-
White Papers
Efficient Quantification Using Local Information for Cooperative Spectrum Sensing in Cognitive Radio
May 2010
Cooperative spectrum sensing, a key technology in cognitive radio, has to summarize all the detection information from cognitive terminals without licensed band. In order to employ both reliable...
Provided by Norwegian University of Science and Technology
-
White Papers
Spectrum Sharing in Cognitive Radio With Quantized Channel Information
Oct 2010
In this paper, the authors consider a wideband spectrum sharing system where a secondary user can share orthogonal frequency bands with a number of primary users, each licensed to use an...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
An Evaluation of Cognitive Channel Allocation Strategies for Coalition Deployments
Oct 2010
In this paper, the authors consider the problem of interference management in coalition deployments, where platoons of soldiers from different nations communicate using the same frequency bands,...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Robust Transmit Beamforming in Cognitive Radio Networks
Nov 2008
This paper investigates the design of robust transmit beam-forming for the Secondary User (SU) when it co-exists with the Primary User (PU) in a cognitive radio network, and the SU's Transmitter...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Analysis on Deployment Parameters of Secondary Users in Cognitive Radio Networks
Oct 2010
Cognitive radio has emerged as an efficient approach to implement reuse of the licensed spectrums. How to appropriately deploy and construct the secondary network plays a rather important role. In...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Enhanced Spectrum Sensing Techniques for Dynamic Spectrum Access Cognitive Radio Networks
Oct 2010
Spectrum access protocols permit secondary users to utilize frequency bands when the bands are not in use by the primary owners. To determine if a frequency band is in use, spectrum sensing...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
A Weighted Cooperative Spectrum Sensing Framework for Infrastructure-Based Cognitive Radio Networks
Feb 2011
Spectrum sensing plays a critical role in cognitive radio networks. A good sensing scheme can reduce the false alarm probability and the miss detection probability, and thus improves spectrum...
Provided by Reed Elsevier
-
White Papers
Sensing and Probing Cardinalities for Active Cognitive Radios
Mar 2012
In a cognitive radio network, Opportunistic Spectrum Access (OSA) to the underutilized spectrum involves not only sensing the spectrum occupancy, but also probing the channel quality in order to...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Resource Allocation for Downlink Spectrum Sharing in Cognitive Radio Networks
Jun 2008
The authors consider a resource allocation problem for spectrum sharing in cognitive radio networks. Specifically, they investigate the joint sub-channel, rate and power allocation for secondary...
Provided by University of Waterloo
-
White Papers
Spectrum Pricing Games With Spatial Reuse in Cognitive Radio Networks
Jan 2011
In Cognitive Radio Networks (CRN), there are multiple primary and secondary users in a region, and primaries can lease out their unused bandwidth to secondaries in exchange for a fee. This gives...
Provided by University of Pennsylvania
-
White Papers
Cooperative Spectrum Sharing in Cognitive Radio Networks: A Game-Theoretic Approach
Sep 2009
The authors consider the problem of cooperative spectrum sharing among a primary user and multiple secondary users, where the primary user selects a proper set of secondary users to serve as the...
Provided by Shanghai Jiao Tong University
-
White Papers
Energy Efficiency Improvements Through Micro Sites in Cellular Mobile Radio Networks
Sep 2009
Efforts to increase the energy efficiency of information and communication systems in general and cellular mobile radio networks in particular have recently gained momentum. Besides positive...
Provided by Dresden University of Technology
-
White Papers
Traffic Demand and Energy Efficiency in Heterogeneous Cellular Mobile Radio Networks
Feb 2010
Optimization of the energy efficiency is considered not only to positively contribute to the ecological assessment, but gains in importance from operator's point of view as well, since energy...
Provided by Dresden University of Technology
-
White Papers
Estimation of a Probability of Interference in a Cellular Communication Network Using the Monte-Carlo Technique
Jul 2009
A Monte-Carlo technique based methodology for the estimation of a probability of interference in a cellular communication network is presented. This probability is considered for the case of...
Provided by University of Swaziland
-
White Papers
A Study on Cellular CDMA-Based for New Generation Mobile Radio System
Feb 2010
As the networks improve and new demands for rapid data transfer rates and multimedia services grow, operators are seeking new cellular communication solutions based on technologies like GSM, 3GSM...
Provided by Journal of Theoretical and Applied Information Technology
-
White Papers
Public Safety Land Mobile Radio Cyber and Information Assurance
Oct 2010
The importance of Cyber Security (CS) for public safety mission critical Land Mobile Radio (LMR) Systems has only recently gained the attention of the market. It is just now beginning to be...
Provided by Harris
-
White Papers
Issues in Deploying Smart Antennas in Mobile Radio Networks
Jun 2009
With the exponentially increasing demand for wireless communications the capacity of current cellular systems will soon become incapable of handling the growing traffic. Since radio frequencies...
Provided by University of Pune
-
White Papers
Emulation of Radio Access Networks to Facilitate the Development of Distributed Applications
Jan 2008
Emulation of Radio Access Networks is a valuable tool for the development of distributed applications incorporating mobile terminals. The network simulator ns - 2 provides mechanisms to route live...
Provided by Academy Publisher
-
White Papers
Low-Power LFSR Kernel Architecture in Mobile Transmitter and Receiver Protocols and Software Defined Radios
Nov 2009
The LFSR operations are performed in implementing the different mobile-device protocols and encryption standards during transmission and reception. These operations are performed at the PN coding...
Provided by Academy Publisher
-
White Papers
Routing Metrics for Multi-Radio Wireless Mesh Networks
Aug 2007
Multi-radio wireless mesh networks provide a great improvement over traditional mobile ad-hoc networks and are able to provide increased capacity and scalability. Routing metrics for multi-radio...
Provided by University of Queensland
-
White Papers
Optimal Spectrum Sharing for Multi-Hop Software Defined Radio Networks
Mar 2008
Software Defined Radio (SDR) capitalizes advances in signal processing and radio technology and is capable of reconfiguring RF and switching to desired frequency bands. It is a frequency-agile...
Provided by Virginia Tech
-
White Papers
Distributed Cross-Layer Optimization for Cognitive Radio Networks
Jul 2010
This paper presents a distributed cross-layer optimization algorithm for a multi-hop cognitive radio network, with the objective of maximizing data rates for a set of user communication sessions....
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
On the Throughput of MIMO-Empowered Multi-Hop Cognitive Radio Networks
Dec 2010
Cognitive Radio (CR) and Multiple-Input Multiple-Output (MIMO) are two independent physical layer technologies that have made significant impact on wireless networking. CR operates on the...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Efficient Resource Allocation With Flexible Channel Cooperation in OFDMA Cognitive Radio Networks
Dec 2009
Recently, a cooperative paradigm for single-channel cognitive radio networks has been advocated, where primary users can leverage secondary users to relay their traffic. However, it is not clear...
Provided by University of Toronto
-
White Papers
Cognitive Radio Enabled Multi-Channel Access for Vehicular Communications
May 2010
The IEEE 1609.4 standard has been proposed to provide multi-channel operations in Wireless Access for Vehicular Environments (WAVE), where all the channels are periodically synchronized into...
Provided by University of California
-
White Papers
Distributed Spectrum Sharing for Video Streaming in Cognitive Radio Ad Hoc Networks
Aug 2009
A distributed joint routing and spectrum sharing algorithm for video streaming applications over cognitive radio ad hoc networks is proposed in this paper. The proposed cross-layer control scheme...
Provided by University at Buffalo
-
White Papers
Distributed and Provably-Efficient Algorithms for Joint Channel-Assignment, Scheduling and Routing in Multi-Channel Ad Hoc Wireless Networks
Jan 2011
The capacity of ad hoc wireless networks can be substantially increased by equipping each network node with multiple radio interfaces that can operate on multiple non-overlapping channels....
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Binary Inference for Primary User Separation in Cognitive Radio Networks
Dec 2010
Spectrum sensing receives much attention recently in the Cognitive Radio (CR) network research, i.e., Secondary Users (SUs) constantly monitor channel condition to detect the presence of the...
Provided by University of Houston
-
White Papers
Exploiting Multi-Antennas for Opportunistic Spectrum Sharing in Cognitive Radio Networks
Nov 2007
In Cognitive Radio (CR) networks, there are scenarios where the secondary (lower priority) users intend to communicate with each other by opportunistically utilizing the transmit spectrum...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Fast Cycle Frequency Domain Feature Detection for Cognitive Radio Systems
Mar 2009
In cognitive radio systems, one of the main requirements is to detect the presence of the primary users' transmission, especially in weak signal cases. Cyclostationary detection is always used to...
Provided by Shanghai Jiao Tong University
-
White Papers
On Oligopoly Spectrum Allocation Game in Cognitive Radio Networks With Capacity Constraints
Jun 2009
Dynamic spectrum sharing is a promising technology to improve spectrum utilization in the future wireless networks. The flexible spectrum management provides new opportunities for licensed primary...
Provided by Chinese University of Hong Kong
-
White Papers
Design of Learning Based MIMO Cognitive Radio Systems
May 2009
This paper addresses the design issues of the multi-antenna-based Cognitive Radio (CR) system that is able to operate concurrently with the licensed Primary Radio (PR) system. The authors propose...
Provided by Jacobs University Bremen
-
White Papers
Efficient Batch Update of Unique Identifiers in a Distributed Hash Table for Resources in a Mobile Host
Jun 2010
Resources in a distributed system can be identified using identifiers based on random numbers. When using a distributed hash table to resolve such identifiers to network locations, the...
Provided by Cornell University
-
White Papers
From Spectrum Pooling to Space Pooling: Opportunistic Interference Alignment in MIMO Cognitive Networks
Dec 2009
The authors describe a non-cooperative Interference Alignment (IA) technique which allows an opportunistic Multiple Input Multiple Output (MIMO) link (secondary) to harmlessly coexist with another...
Provided by Massachusetts Institute of Technology
-
White Papers
Detecting Primary Signals Using Time and Space Model
May 2008
The advantage of using cognitive radio technology is its ability to adapt and behave to the needs of the application. The adaptability to the application leads cognitive radios with the potential...
Provided by Grambling State University
-
White Papers
Defense Against Primary User Emulation Attacks in Cognitive Radio Networks
Nov 2007
Cognitive Radio (CR) is a promising technology that can alleviate the spectrum shortage problem by enabling unlicensed users equipped with CRs to coexist with incumbent users in licensed spectrum...
Provided by Virginia Polytechnic Institute and State University
-
White Papers
A Multipath Routing and Spectrum Access (MRSA) Framework for Cognitive Radio Systems in Multi-Radio Mesh Networks
Sep 2009
Cognitive Radio (CR) techniques to dynamically utilize the frequency spectrum are under hot discussion recently. In particular, wireless mesh networks along with CR techniques may play a vital...
Provided by Association for Computing Machinery
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White Papers
TCP Improvement in Multi-Radio Multi-Channel Multi-Hop Networks
Dec 2008
In this paper, the authors seek to enhance the poor performance of original TCP in wireless multi-hop environments due to the intra-flow contention between TCP-DATA and TCP-ACK packets. Assuming...
Provided by Association for Computing Machinery
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White Papers
A Femtocell-Based Testbed for Evaluating Future Cellular Networks
May 2008
This paper argues that the network community needs research testbeds for cellular wireless networks, and introduces a femtocell-based testbed, dubbed Cell-Lab, which is currently being developed...
Provided by Seoul National University
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White Papers
Identifying Dynamic Network Modules With Temporal and Spatial Constraints
Sep 2008
Despite the rapid accumulation of systems-level biological data, understanding the dynamic nature of cellular activity remains a difficult task. The reason is that most biological data are static,...
Provided by University of Southern California
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White Papers
Cooperative Communications for Cognitive Radio Networks
Jun 2007
Cognitive radio is observed as a novel approach, which could cope with the spectral limitations. This approach is designed to detect whether a particular segment of the radio spectrum is currently...
Provided by Hong Kong University of Science and Technology
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Whitepapers
Cognitive Access Policies Under a Primary ARQ Process via Forward-Backward Interference Cancellation
Nov 2012
This paper introduces a novel technique for access by a cognitive Secondary User (SU) using best-effort transmission to a spectrum with an incumbent Primary User (PU), which uses Type-I Hybrid...
Provided by Aalborg University
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Whitepapers
Pilot Design for Non-Contiguous Spectrum Usage in OFDM-Based Cognitive Radio Networks
Aug 2012
This paper, challenges regarding the provision of Channel State Information (CSI) in Non-Contiguous Orthogonal Frequency Division Multiplexing (NC-OFDM) and Cognitive Radio (CR) systems are...
Provided by EURASIP
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Whitepapers
Globally Optimal Precoder Design With Finite-Alphabet Inputs for Cognitive Radio Networks
Nov 2012
This paper investigates the linear pre-coder design for spectrum sharing in multi-antenna cognitive radio networks with finite alphabet inputs. It formulates the pre-coding problem by maximizing...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Analysis of Channel Estimation Imperfections within the 3GPP LTE Physical Layer
Sep 2011
This paper aims the investigation of radio link performance of the 3GPP LTE in terms of the bit- and block error rate, assuming different error models for the feedback of the channel state...
Provided by Budapest University of Technology and Economics
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Whitepapers
Increasing Sum-Rate in Large-Scale Cognitive Radio Networks by Centralized Power and Spectrum Allocation
Dec 2012
The authors revisit the widely investigated problem of maximizing the centralized sum-rate capacity in a cognitive radio network. They consider an interference-limited multi-user multi-channel...
Provided by EURASIP
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Whitepapers
Joint Optimization of Detection Threshold and Resource Allocation in Infrastructure-Based Multi-Band Cognitive Radio Networks
Nov 2012
Consider an infrastructure-based multi-band Cognitive Radio Network (CRN) where Secondary Users (SUs) opportunistically access a set of sub-carriers when sensed as idle. The carrier sensing...
Provided by EURASIP
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Whitepapers
Distributed Execution of Cognitive Relaying with Time Incentive: Multiple PU Scenario
Nov 2012
This paper deals in developing distributed algorithms for Cognitive Relaying with Time Incentive for Multiple primary users (CRTI-M). CRTI-M is a symbiotic paradigm in which the incumbent Primary...
Provided by EURASIP
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Whitepapers
On the Reusage of Primary Radio Resources Through the Exploitation of the Spatiotemporal Robustness of the MIMO Transmissions
Aug 2012
The spatiotemporal robustness of the MIMO transmissions is exploited aiming at inducing opportunistic secondary communications on the primary radio resources. The proposed model makes use of the...
Provided by Hindawi Publishing
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Whitepapers
Relay Based Cooperative Spectrum Sensing in Cognitive Radio Networks Over Nakagami Fading Channels
Apr 2012
In this paper, the authors address the issue of cooperative spectrum sensing in cognitive radio networks. Here relay stations are introduced in cognitive radio network. In the proposed research,...
Provided by International Journal of Multidisciplinary Sciences and Engineering (IJMSE)
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Whitepapers
Design of Spectrum Sensing Policy for Multi-User Multi-Band Cognitive Radio Network
Sep 2012
Finding an optimal sensing policy for a particular access policy and sensing scheme is a laborious combinatorial problem that requires the system model parameters to be known. In practice the...
Provided by Aalto University
