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radio frequency data communications
(383 results)-
White Papers
Average SIR Estimation in Cellular Networks With Best Server Policy
Sep 2010
The evaluation of the Signal to Interference Ratio (SIR) in cellular networks is of primary importance for network dimensioning. For static studies, which evaluate cell capacity and coverage, as...
Provided by Telecom ParisTech
-
White Papers
A Tabu Search DSA Algorithm for Reward Maximization in Cellular Networks
Jul 2010
In this paper, the authors present and analyze a Tabu Search (TS) algorithm for DSA (Dynamic Spectrum Access) in cellular networks. They study a mono-operator case where the operator is providing...
Provided by Telecom ParisTech
-
White Papers
An Auction Framework for Spectrum Allocation With Interference Constraint in Cognitive Radio Networks
Jul 2009
Extensive research in recent years has shown the benefits of cognitive radio technologies to improve the flexibility and efficiency of spectrum utilization. This new communication paradigm,...
Provided by Politecnico di Milano
-
White Papers
Inter-Operator Spectrum Sharing for Cellular Networks Using Game Theory
Jun 2009
Spectrum sharing and DSA techniques have been active research topics for the past decade due to the spectrum crowd situation. The existing spectrum allocation process, denoted as FSA, headed for...
Provided by Telecom ParisTech
-
White Papers
Impact of Topology and Shadowing on the Outage Probability of Cellular Networks
Feb 2009
The estimation of cellular networks capacity mainly depends on the characterization of interference. As downlink is often the limited link w.r.t. capacity, the authors focus on this direction...
Provided by Telecom ParisTech
-
White Papers
Optimal and Heuristic DSA Policies for Cellular Networks With Coordinated Access Band
Apr 2009
Due to the increasing demands for higher data rate applications, also due to the actual spectrum crowd situation, DSA (Dynamic Spectrum Access) turned into an active research topic. In this paper,...
Provided by Telecom ParisTech
-
White Papers
Analytical Evaluation of Various Frequency Reuse Schemes in Cellular OFDMA Networks
Oct 2008
In this paper, the authors present an analytical solution to carry out performance analysis of various frequency reuse schemes in an OFDMA based cellular network. They study the performance in...
Provided by ICST
-
White Papers
A Game-Theoretical Modeling Framework for Spectrum Markets and Cognitive-Radio Devices
Feb 2011
This paper presents a novel game-theoretical framework to model the evolution of spectrum markets that consists of multiple spectrum/network operators that provide wireless access to users. It...
Provided by University of Crete
-
White Papers
Distributed Cooperative Transmission With Unreliable and Untrustworthy Relay Channels
Oct 2009
Cooperative transmission is an emerging wireless communication technique that improves wireless channel capacity through multi-user cooperation in the physical layer. It is expected to have a...
Provided by University of Rhode Island
-
White Papers
Dynamics of Multiple-Seller and Multiple-Buyer Spectrum Trading in Cognitive Radio Networks: A Game-Theoretic Modeling Approach
Apr 2009
The authors consider the problem of spectrum trading with multiple licensed users (i.e., primary users) selling spectrum opportunities to multiple unlicensed users (i.e., secondary users). The...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Pricing of Cognitive Radio Rights to Maintain the Risk-Reward of Primary User Spectrum Investment
Mar 2010
Cognitive Radio (CR) has been recently proposed as a method of alleviating the shortage of radio spectrum, by increasing the efficiency of spectrum use. However, as large portions of spectrum...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Spectrum Sharing Games of Infrastructure-Based Cognitive Radio Networks
Sep 2008
The IEEE 802.22 standard is the first proposed standard for the cognitive radio networks in which a set of Base Stations (BSs) make opportunistic spectrum access to provide wireless access to the...
Provided by EPFL
-
White Papers
Detection of Rank-P Signals in Cognitive Radio Networks With Uncalibrated Multiple Antennas
Apr 2011
Spectrum sensing is a key component of the Cognitive Radio paradigm. Primary signals are typically detected with uncalibrated receivers at Signal-to-Noise Ratios (SNRs) well below decodability...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Multiantenna Detection Under Noise Uncertainty and Primary User's Spatial Structure
Oct 2010
Spectrum sensing is a challenging key component of the Cognitive Radio paradigm, since primary signals must be detected in the face of noise uncertainty and at Signal-to-Noise Ratios (SNRs) well...
Provided by University of Vigo
-
White Papers
Wideband Spectral Estimation From Compressed Measurements Exploiting Spectral a Priori Information in Cognitive Radio Systems
Feb 2010
In Cognitive Radio scenarios channelization information from primary network may be available to the spectral monitor. Under this assumption the authors propose a spectral estimation algorithm...
Provided by Universidad de Vigo
-
White Papers
Multiantenna Detection of Multicarrier Primary Signals Exploiting Spectral a Priori Information
Feb 2010
The authors consider the problem of detecting a primary signal over a wireless channel by a multiantenna cognitive spectral monitor with knowledge of the spectral shape of primary transmissions...
Provided by Universidad de Vigo
-
White Papers
Wideband Spectrum Sensing in Cognitive Radio: Joint Estimation of Noise Variance and Multiple Signal Levels
Feb 2010
The cognitive radio paradigm is based on the ability to detect the presence of primary users in a given frequency band. In this scenario a spectrum monitor may estimate the signal power levels of...
Provided by Universidad de Vigo
-
White Papers
Resource-Aware Dynamic Spectrum Pricing for Cognitive Radio Networks
Aug 2009
Sharing of spectrum has been identified as a key requirement in Cognitive Radio Networks (CRNs). The authors address the problem of spectrum sharing with spectrum pricing where the primary user...
Provided by Seoul National University
-
White Papers
Learning to Thrive in a Leasing Market: An Auctioning Framework for Distributed Dynamic Spectrum Leasing (D-DSL)
Dec 2010
Recently proposed Dynamic Spectrum Leasing (DSL) for Dynamic Spectrum Sharing (DSS) presumes that there is a reward for primary users for accepting secondary activity. The reward primary users...
Provided by University of New Mexico
-
White Papers
LMS Beamforming Using Pre and Post-FFT Processing for OFDM Communication Systems
Jun 2007
The adaptive array antenna is combined with OFDM "Orthogonal frequency division multiplexing" as multicarrier technique to combat the flat and frequency selective fading effects at high speed...
Provided by Alexandria University
-
White Papers
Double-Sided Printed Triangular Bow-Tie Antenna for UWB Communications
Aug 2007
In this paper a probe fed printed bow-tie antenna with different configurations are designed to achieve a wide impedance bandwidth. A double-sided printed triangular bow-tie antenna with a pair of...
Provided by Arab Academy for Science, Technology & Maritime Transport
-
White Papers
Improving Drive-Thru Access to Roadside Infrastructure by Lightweight Relay
Jan 2008
In this paper the authors propose a relay-based solution to extend the service range of roadside APs. When a vehicle moves towards the AP, its signal quality to the AP may be poor. At this time,...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Cognitive Radio: From Spectrum Sharing to Adaptive Learning and Reconfiguration
Jan 2010
This paper introduces important cognitive radio developments like spectrum sharing, learning and adaptation algorithms, and the software and hardware architecture to support these functions. A...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Leveraging Strictly Causal State Information at the Encoders for Multiple Access Channels
May 2011
The state-dependent Multiple Access Channel (MAC) is considered where the state sequences are known strictly causally to the encoders. First, a two-user MAC with two independent states each known...
Provided by Pennsylvania State University
-
White Papers
On the Capacity Region of a Multiple Access Channel With Common Messages
Jun 2010
A Multiple Access Channel (MAC) consists of multiple users transmitting to a common receiver. The capacity region of the MAC was first characterized by Ahlswede and Liao, assuming independent...
Provided by New Jersey Institute of Technology
-
White Papers
Oblivious Relaying for Primitive Interference Relay Channels
Jan 2010
Consider a relay node that needs to operate without knowledge of the codebooks (i.e., modulation, coding) employed by the assisted source-destination pairs. This paper studies the performance of...
Provided by Polytechnic Institute of NYU
-
White Papers
Compound Relay Channel With Informed Relay and Destination
Nov 2009
A two-state compound relay channel is considered where the relay and the destination are informed about the channel state while the source is not. Achievable rates and upper bounds are derived for...
Provided by Princeton University
-
White Papers
Interference Channel With a Half-Duplex Out-of-Band Relay
May 2010
A Gaussian Interference Channel (IC) aided by a half-duplex relay is considered, in which the relay receives and transmits in an orthogonal band with respect to the IC. The system thus consists of...
Provided by Polytechnic Institute of NYU
-
White Papers
Throughput Analysis of Type-I HARQ Strategies in Two-Way Relay Channels
Mar 2009
A Two-Way Relay Channel (TWRC) is studied over quasi-static fading channels by focusing on the throughput of Type-I HARQ strategies. An upper bound is evaluated, along with a number of achievable...
Provided by New Jersey Institute of Technology
-
White Papers
Impact of Secondary MAC Cooperation on Spectrum Sharing in Cognitive Radio Networks
Dec 2008
The need to accommodate fast-emerging wireless communication services has motivated academia and industry to look for a solution to the problem of available spectrum scarcity. In fact, recent...
Provided by New Jersey Institute of Technology
-
White Papers
Interference Channel With a Relay: Models, Relaying Strategies, Bounds
Feb 2009
This paper discusses the impact of relaying in interference-limited networks by studying a two-user Gaussian Interference Channel with a Relay (ICR). Various models for relay reception and...
Provided by New Jersey Institute of Technology
-
White Papers
A Broadcast Approach to Robust Communications Over Unreliable Multi-Relay Networks
Feb 2009
A multi-relay network is studied in which communication from source to relays takes place over a Gaussian broadcast channel, while the relays are connected to the receiver via orthogonal...
Provided by Princeton University
-
White Papers
Cognitive Relaying and Opportunistic Spectrum Sensing in Unlicensed Multiple Access Channels
Jun 2008
In this paper, a cognitive multiple access channel with one primary node and M secondary nodes is considered, and the impact of the following techniques on the stability region of the system is...
Provided by Politecnico di Milano
-
White Papers
Spectrum Leasing Via Distributed Cooperation in Cognitive Radio
Jan 2008
The concept of cognitive radio (or secondary spectrum access) is currently under investigation as a promising paradigm to achieve efficient use of the frequency resource. In this paper, the...
Provided by New Jersey Institute of Technology
-
White Papers
Scheduling for Multiuser MIMO Downlink Channels With Ranking-Based Feedback
Oct 2008
The authors consider a multi-antenna broadcast channel with more single-antenna receivers than transmit antennas and partial Channel State Information at the Transmitter (CSIT). They propose a...
Provided by University of Texas
-
White Papers
Hybrid Pilot/Quantization Based Feedback in Multi-Antenna TDD Systems
Aug 2009
The communication between a multiple-antenna transmitter and multiple receivers (users) with either a single or multiple-antenna each can be significantly enhanced by providing the Channel State...
Provided by EURECOM
-
White Papers
Robust Detection of OFDM Signals for Cognitive UWB in Low SNR With Noise Uncertainty
Jul 2008
Sensing the weak signals of primary users by cognitive UWB devices greatly challenges the capability of energy detector under noise uncertainty. This paper presents a simple and robust statistic...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Double Thresholds for Judgment in Cognitive Spectrum Sensing
Jul 2008
In cognitive radio system, secondary users should have capability of detecting the signal from primary user to evade interfering harmfully with any primary receiver. The duration used for spectrum...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Parametric Channel Estimation by Exploiting Hopping Pilots in Uplink OFDMA
Jul 2008
In this paper, a parametric channel estimation algorithm applicable to uplinks of Orthogonal Frequency Division Multiple Access (OFDMA) systems whose subcarriers are pseudo-randomly allocated is...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Low Complexity User Selection for MIMO Broadcast Channels
Jul 2008
A novel low complexity user selection strategy was proposed for MIMO broadcast channels, where zero-forcing beamforming was considered. As the number of simultaneously supportable users at the...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Wireless Vehicular Adaptive Radio Resource Management Policies in Congested Channels
Jan 2009
The strict QoS traffic safety requirements and the potential widespread adoption of wireless vehicular communication systems require the design and optimization of radio resource management...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Adaptive Wireless Vehicular Communication Techniques Under Correlated Radio Channels
May 2009
Wireless vehicular communication systems require the design and implementation of robust and efficient communication policies to provide the strict quality of service needed by traffic safety...
Provided by Universidad Miguel Hernandez
-
White Papers
iTETRIS Heterogeneous Wireless Communication Platform for the Large-Scale Evaluation of Cooperative Road Traffic Management Policies
Sep 2009
Cooperative vehicular communications are being developed to improve road safety and traffic management by assisting drivers and road authorities with real-time and comprehensive traffic...
Provided by Universidad Miguel Hernandez
-
White Papers
On the Capacity of Multi-Packet Reception Enabled Multi-Channel Multi-Interface Wireless Networks
Dec 2009
Multi-Packet Reception (MPR) offers increased number of concurrent transmissions, which improves the capacity of wireless Ad hoc networks. By equipping each node with multiple wireless interfaces,...
Provided by Reed Elsevier
-
White Papers
Collision-Tolerant Transmission With Narrow-Beam Antennas
Dec 2008
The application of directional antennas in wireless ad hoc networks brings numerous benefits, such as increased spatial reuse and mitigated interference. Most MAC protocols with directional...
Provided by Chinese University of Hong Kong
-
White Papers
Dynamic Resource Management for Cognitive Radios Using Limited-Rate Feedback
Sep 2009
Tailored for the emerging class of cognitive radio networks comprising primary and secondary wireless users, the present paper deals with dynamic allocation of subcarriers, rate and power...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Distributed Spectrum Sensing for Cognitive Radio Networks by Exploiting Sparsity
Mar 2010
A cooperative approach to the sensing task of wireless Cognitive Radio (CR) networks is introduced based on a basis expansion model of the Power Spectral Density (PSD) map in space and frequency....
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Sequential and Cooperative Sensing for Multi-Channel Cognitive Radios
Aug 2010
Effective spectrum sensing is a critical prerequisite for multi-channel Cognitive Radio (CR) networks, where multiple spectrum bands are sensed to identify transmission opportunities, while...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Optimal Resource Allocation for MIMO Ad Hoc Cognitive Radio Networks
May 2011
Maximization of the weighted sum-rate of Secondary Users (SUs) possibly equipped with multi-antenna transmitters and receivers is considered in the context of Cognitive Radio (CR) networks with...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
An Overview of Radio Resource Management in Relay-Enhanced OFDMA-Based Networks
Jul 2010
Researchers in both academia and industry have accepted OFDMA as the most appropriate air-interface for the emerging broadband wireless access networks and standards. A number of IEEE working...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Capacity of Wireless Ad Hoc Networks Using Practical Directional Antennas
May 2010
Capacity is one fundamental problem in wireless Ad hoc networks. Deploying directional antennas to wireless networks can reduce interference among concurrent transmissions and increase spatial...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Upper Bounds on the Number of Channels to Ensure Collision-Free Communications in Multi-Channel Wireless Networks Using Directional Antennas
May 2010
Recent studies have found that using multiple channels can separate concurrent transmissions and significantly improve network throughput. However, these studies have only considered wireless...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
A Busy-Tone Based MAC Scheme for Wireless Ad Hoc Networks Using Directional Antennas
Jul 2007
Applying directional antennas in wireless ad hoc networks offers numerous benefits, such as extended communication range, increased spatial reuse, improved capacity and suppressed interference....
Provided by Shanghai Jiao Tong University
-
White Papers
Spectrum Sharing in Cognitive Radio Networks - An Auction Based Approach
Oct 2009
Cognitive radio is emerging as a promising technique to improve the utilization of radio frequency spectrum. In this paper, the authors consider the problem of spectrum sharing among primary (or...
Provided by National Cheng Kung University
-
White Papers
MAP: Multiauctioneer Progressive Auction for Dynamic Spectrum Access
May 2011
Cognitive Radio (CR) is a promising paradigm to achieve efficient utilization of the limited spectrum resource by allowing the unlicensed users to access the licensed spectrum, and Dynamic...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Pricing for Uplink Power Control in Cognitive Radio Networks
Jan 2010
The authors study the pricing issue in a competitive cognitive radio network in which the secondary users strategically adjust their uplink transmission power levels to maximize their own...
Provided by University of Manitoba
-
White Papers
Coalitional Game Theoretic Approach for Secondary Spectrum Access in Cooperative Cognitive Radio Networks
Mar 2011
In this paper, the authors exploit a novel setting for Cognitive Radio (CR) networks to enable multiple operators to involve Secondary Users (SUs) as cooperative relays for their primary users. In...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Testing of Policy-Based Dynamic Spectrum Access Radios
Nov 2010
Policy-driven Dynamic Spectrum Access (DSA) systems are emerging as one of the key technologies to enable the Department of Defense (DoD) to meet its increasing requirements for access to the...
Provided by Naval Research Laboratory
-
White Papers
Channel Sharing in Cognitive Radio Networks
Oct 2010
In this paper, the authors consider a cognitive radio network in which the secondary users are allowed to share the spectrum with the primary users as long as the interference caused by the...
Provided by Naval Research Laboratory
-
White Papers
On Collision-Tolerant Transmission With Directional Antennas
Oct 2007
The application of directional antennas in wireless networks brings numerous benefits, such as increased spatial reuse and mitigated interferences. Most MAC protocols with directional antennas are...
Provided by Chinese University of Hong Kong
-
White Papers
A Joint Routing and Scheduling Scheme for Wireless Networks With Multi-Packet Reception and Directional Antennas
Apr 2010
In this paper, the authors present a linear programming formulation for the throughput optimization problem in wireless networks that support Multi-Packet Reception (MPR) capability. The...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
An Overview of Channel Assignment Methods for Multi-Radio Multi-Channel Wireless Mesh Networks
Sep 2009
Channel Assignment (CA) is an active research area due to the proliferating deployments of multi-radio multi-channel wireless mesh networks. This paper presents an in-depth survey of some of the...
Provided by Reed Elsevier
-
White Papers
A Survey on Channel Assignment Approaches for Multi-Radio Multi-Channel Wireless Mesh Networks
Aug 2007
Channel Assignment (CA) has emerged as a new research area due to the rising commercial deployments of multi-radio multi-channel wireless mesh networks today. This paper presents an in-depth...
Provided by University of Sydney
-
White Papers
Design and Implementation of UWB Receiver
Jul 2011
Wireless technology has given a convenient way to transfer information from one point to other anywhere in the world. The last two decades have been the most dynamic in the history of wireless...
Provided by BHAI MAHA SINGH COLLEGE OF ENGINEERING
-
White Papers
Efficient Broadcast in MANETs Using Network Coding and Directional Antennas
Jan 2008
In this paper, the authors consider the issue of efficient broadcasting in Mobile Ad hoc NETworks (MANETs) using network coding and directional antennas. Network coding-based broadcasting focuses...
Provided by Rensselaer Polytechnic Institute
-
White Papers
Population Adaptation for Genetic Algorithm-Based Cognitive Radios
Jun 2007
Genetic algorithms are best suited for optimization problems involving large search spaces. The problem space encountered when optimizing the transmission parameters of an agile or cognitive radio...
Provided by University of Kansas
-
White Papers
Sidelobe Suppression for OFDM-Based Cognitive Radios Using Constellation Expansion
Jan 2008
In this paper, the authors present a novel algorithm for reducing sidelobe interference power levels in OFDM-based cognitive radios. Existing techniques for sidelobe suppression can be...
Provided by Worcester Polytechnic Institute
-
White Papers
Loading Algorithm for Multicarrier Spatial Diversity Systems With Antenna Selection
Jun 2007
In this paper, a novel loading algorithm consisting of four variants is proposed for a multicarrier transceiver employing multiple antennas configured for spatial diversity. The primary objective...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Distributed Compressive Spectrum Sensing in Cooperative Multihop Cognitive Networks
Feb 2011
In wideband Cognitive Radio (CR) networks, spectrum sensing is an essential task for enabling dynamic spectrum sharing, but entails several major technical challenges: very high sampling rates...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Distributed Optimal Relay Selection for Improving TCP Throughput in Cognitive Radio Networks: A Cross-Layer Design Approach
Aug 2011
In Cognitive Radio (CR) networks, cooperative relaying is emerging as a key technology to improve the performance of Secondary Users (SUs), while ensuring the quality of service of primary users....
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
MAC Protocol for Opportunistic Cognitive Radio Networks With Soft Guarantees
Dec 2008
Cognitive Radio (CR) is the key enabling technology for an efficient dynamic spectrum access. It aims at exploiting an underutilized licensed spectrum by enabling opportunistic communications for...
Provided by University of Arizona
-
White Papers
Cooperative Adaptive Spectrum Sharing in Cognitive Radio Networks
Dec 2009
The Cognitive Radio (CR) paradigm calls for open spectrum access according to a predetermined etiquette. Under this paradigm, CR nodes access the spectrum opportunistically by continuously...
Provided by University of Arizona
-
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
Local Channel Assignments in Cognitive Radio Networks
May 2011
Cognitive Radio Networks (CRNs) promise to enable the next generation of communication networks. The Channel Assignment (CA) problem is one of the most important issues in CRNs. In this paper, the...
Provided by Temple University
-
White Papers
Connectivity-Driven Routing for Cognitive Radio Ad-Hoc Networks
May 2010
The authors design a routing scheme based on an extension of the algebraic connectivity concept for cognitive radio ad hoc networks. They observe that a cognitive radio network topology and its...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Maximum-Rate Node Selection for Power-Limited Multiantenna Relay Backbones
Jun 2009
Wireless Mesh Networks (WMNs) are envisioned for extending the coverage of WLANs by interconnecting the underlying Access Points (APs) via high-capacity wireless backbones. Since the ultimate goal...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Radio Diversity for Reliable Communication in WSNs
Apr 2011
Deployment of wireless sensors in real world environments is often a frustrating experience. The quality of radio links is highly coupled to unpredictable physical environments, leading to...
Provided by Association for Computing Machinery
-
White Papers
Low-Power Radio Communication in Industrial Outdoor Deployments: The Impact of Weather Conditions and ATEX-Compliance
Jun 2009
Industry recognizes wireless sensor networks as one of the next major technical and economical shifts in automation and control systems. Industrial applications need performance assurances of...
Provided by Swedish Institute of Computer Science
-
White Papers
Controllable Radio Interference for Experimental and Testing Purposes in Wireless Sensor Networks
Jul 2009
The authors address the problem of generating customized, controlled interference for experimental and testing purposes in Wireless Sensor Networks. The known coexistence problems between...
Provided by Swedish Institute of Computer Science
-
White Papers
Evaluation of an Electronically Switched Directional Antenna for Real-World Low-PowerWireless Networks
Sep 2010
The authors present the real-world evaluation of SPIDA, an electronically switched directional antenna. Compared to most existing work in the field, SPIDA is practical as well as inexpensive. They...
Provided by Swedish Institute of Computer Science
-
White Papers
Average SIR Estimation in Cellular Networks With Best Server Policy
Sep 2010
The evaluation of the Signal to Interference Ratio (SIR) in cellular networks is of primary importance for network dimensioning. For static studies, which evaluate cell capacity and coverage, as...
Provided by Telecom ParisTech
-
White Papers
A Tabu Search DSA Algorithm for Reward Maximization in Cellular Networks
Jul 2010
In this paper, the authors present and analyze a Tabu Search (TS) algorithm for DSA (Dynamic Spectrum Access) in cellular networks. They study a mono-operator case where the operator is providing...
Provided by Telecom ParisTech
-
White Papers
An Auction Framework for Spectrum Allocation With Interference Constraint in Cognitive Radio Networks
Jul 2009
Extensive research in recent years has shown the benefits of cognitive radio technologies to improve the flexibility and efficiency of spectrum utilization. This new communication paradigm,...
Provided by Politecnico di Milano
-
White Papers
Inter-Operator Spectrum Sharing for Cellular Networks Using Game Theory
Jun 2009
Spectrum sharing and DSA techniques have been active research topics for the past decade due to the spectrum crowd situation. The existing spectrum allocation process, denoted as FSA, headed for...
Provided by Telecom ParisTech
-
White Papers
Impact of Topology and Shadowing on the Outage Probability of Cellular Networks
Feb 2009
The estimation of cellular networks capacity mainly depends on the characterization of interference. As downlink is often the limited link w.r.t. capacity, the authors focus on this direction...
Provided by Telecom ParisTech
-
White Papers
Optimal and Heuristic DSA Policies for Cellular Networks With Coordinated Access Band
Apr 2009
Due to the increasing demands for higher data rate applications, also due to the actual spectrum crowd situation, DSA (Dynamic Spectrum Access) turned into an active research topic. In this paper,...
Provided by Telecom ParisTech
-
White Papers
Analytical Evaluation of Various Frequency Reuse Schemes in Cellular OFDMA Networks
Oct 2008
In this paper, the authors present an analytical solution to carry out performance analysis of various frequency reuse schemes in an OFDMA based cellular network. They study the performance in...
Provided by ICST
-
White Papers
A Game-Theoretical Modeling Framework for Spectrum Markets and Cognitive-Radio Devices
Feb 2011
This paper presents a novel game-theoretical framework to model the evolution of spectrum markets that consists of multiple spectrum/network operators that provide wireless access to users. It...
Provided by University of Crete
-
White Papers
Distributed Cooperative Transmission With Unreliable and Untrustworthy Relay Channels
Oct 2009
Cooperative transmission is an emerging wireless communication technique that improves wireless channel capacity through multi-user cooperation in the physical layer. It is expected to have a...
Provided by University of Rhode Island
-
White Papers
Dynamics of Multiple-Seller and Multiple-Buyer Spectrum Trading in Cognitive Radio Networks: A Game-Theoretic Modeling Approach
Apr 2009
The authors consider the problem of spectrum trading with multiple licensed users (i.e., primary users) selling spectrum opportunities to multiple unlicensed users (i.e., secondary users). The...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Pricing of Cognitive Radio Rights to Maintain the Risk-Reward of Primary User Spectrum Investment
Mar 2010
Cognitive Radio (CR) has been recently proposed as a method of alleviating the shortage of radio spectrum, by increasing the efficiency of spectrum use. However, as large portions of spectrum...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Spectrum Sharing Games of Infrastructure-Based Cognitive Radio Networks
Sep 2008
The IEEE 802.22 standard is the first proposed standard for the cognitive radio networks in which a set of Base Stations (BSs) make opportunistic spectrum access to provide wireless access to the...
Provided by EPFL
-
White Papers
Detection of Rank-P Signals in Cognitive Radio Networks With Uncalibrated Multiple Antennas
Apr 2011
Spectrum sensing is a key component of the Cognitive Radio paradigm. Primary signals are typically detected with uncalibrated receivers at Signal-to-Noise Ratios (SNRs) well below decodability...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Multiantenna Detection Under Noise Uncertainty and Primary User's Spatial Structure
Oct 2010
Spectrum sensing is a challenging key component of the Cognitive Radio paradigm, since primary signals must be detected in the face of noise uncertainty and at Signal-to-Noise Ratios (SNRs) well...
Provided by University of Vigo
-
White Papers
Wideband Spectral Estimation From Compressed Measurements Exploiting Spectral a Priori Information in Cognitive Radio Systems
Feb 2010
In Cognitive Radio scenarios channelization information from primary network may be available to the spectral monitor. Under this assumption the authors propose a spectral estimation algorithm...
Provided by Universidad de Vigo
-
White Papers
Multiantenna Detection of Multicarrier Primary Signals Exploiting Spectral a Priori Information
Feb 2010
The authors consider the problem of detecting a primary signal over a wireless channel by a multiantenna cognitive spectral monitor with knowledge of the spectral shape of primary transmissions...
Provided by Universidad de Vigo
-
White Papers
Wideband Spectrum Sensing in Cognitive Radio: Joint Estimation of Noise Variance and Multiple Signal Levels
Feb 2010
The cognitive radio paradigm is based on the ability to detect the presence of primary users in a given frequency band. In this scenario a spectrum monitor may estimate the signal power levels of...
Provided by Universidad de Vigo
-
White Papers
Resource-Aware Dynamic Spectrum Pricing for Cognitive Radio Networks
Aug 2009
Sharing of spectrum has been identified as a key requirement in Cognitive Radio Networks (CRNs). The authors address the problem of spectrum sharing with spectrum pricing where the primary user...
Provided by Seoul National University
-
White Papers
Learning to Thrive in a Leasing Market: An Auctioning Framework for Distributed Dynamic Spectrum Leasing (D-DSL)
Dec 2010
Recently proposed Dynamic Spectrum Leasing (DSL) for Dynamic Spectrum Sharing (DSS) presumes that there is a reward for primary users for accepting secondary activity. The reward primary users...
Provided by University of New Mexico
-
White Papers
LMS Beamforming Using Pre and Post-FFT Processing for OFDM Communication Systems
Jun 2007
The adaptive array antenna is combined with OFDM "Orthogonal frequency division multiplexing" as multicarrier technique to combat the flat and frequency selective fading effects at high speed...
Provided by Alexandria University
-
White Papers
Double-Sided Printed Triangular Bow-Tie Antenna for UWB Communications
Aug 2007
In this paper a probe fed printed bow-tie antenna with different configurations are designed to achieve a wide impedance bandwidth. A double-sided printed triangular bow-tie antenna with a pair of...
Provided by Arab Academy for Science, Technology & Maritime Transport
-
White Papers
Improving Drive-Thru Access to Roadside Infrastructure by Lightweight Relay
Jan 2008
In this paper the authors propose a relay-based solution to extend the service range of roadside APs. When a vehicle moves towards the AP, its signal quality to the AP may be poor. At this time,...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Cognitive Radio: From Spectrum Sharing to Adaptive Learning and Reconfiguration
Jan 2010
This paper introduces important cognitive radio developments like spectrum sharing, learning and adaptation algorithms, and the software and hardware architecture to support these functions. A...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
Leveraging Strictly Causal State Information at the Encoders for Multiple Access Channels
May 2011
The state-dependent Multiple Access Channel (MAC) is considered where the state sequences are known strictly causally to the encoders. First, a two-user MAC with two independent states each known...
Provided by Pennsylvania State University
-
White Papers
On the Capacity Region of a Multiple Access Channel With Common Messages
Jun 2010
A Multiple Access Channel (MAC) consists of multiple users transmitting to a common receiver. The capacity region of the MAC was first characterized by Ahlswede and Liao, assuming independent...
Provided by New Jersey Institute of Technology
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White Papers
Oblivious Relaying for Primitive Interference Relay Channels
Jan 2010
Consider a relay node that needs to operate without knowledge of the codebooks (i.e., modulation, coding) employed by the assisted source-destination pairs. This paper studies the performance of...
Provided by Polytechnic Institute of NYU
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White Papers
Compound Relay Channel With Informed Relay and Destination
Nov 2009
A two-state compound relay channel is considered where the relay and the destination are informed about the channel state while the source is not. Achievable rates and upper bounds are derived for...
Provided by Princeton University
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White Papers
Interference Channel With a Half-Duplex Out-of-Band Relay
May 2010
A Gaussian Interference Channel (IC) aided by a half-duplex relay is considered, in which the relay receives and transmits in an orthogonal band with respect to the IC. The system thus consists of...
Provided by Polytechnic Institute of NYU
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White Papers
Throughput Analysis of Type-I HARQ Strategies in Two-Way Relay Channels
Mar 2009
A Two-Way Relay Channel (TWRC) is studied over quasi-static fading channels by focusing on the throughput of Type-I HARQ strategies. An upper bound is evaluated, along with a number of achievable...
Provided by New Jersey Institute of Technology
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White Papers
Impact of Secondary MAC Cooperation on Spectrum Sharing in Cognitive Radio Networks
Dec 2008
The need to accommodate fast-emerging wireless communication services has motivated academia and industry to look for a solution to the problem of available spectrum scarcity. In fact, recent...
Provided by New Jersey Institute of Technology
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White Papers
Interference Channel With a Relay: Models, Relaying Strategies, Bounds
Feb 2009
This paper discusses the impact of relaying in interference-limited networks by studying a two-user Gaussian Interference Channel with a Relay (ICR). Various models for relay reception and...
Provided by New Jersey Institute of Technology
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White Papers
A Broadcast Approach to Robust Communications Over Unreliable Multi-Relay Networks
Feb 2009
A multi-relay network is studied in which communication from source to relays takes place over a Gaussian broadcast channel, while the relays are connected to the receiver via orthogonal...
Provided by Princeton University
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White Papers
Cognitive Relaying and Opportunistic Spectrum Sensing in Unlicensed Multiple Access Channels
Jun 2008
In this paper, a cognitive multiple access channel with one primary node and M secondary nodes is considered, and the impact of the following techniques on the stability region of the system is...
Provided by Politecnico di Milano
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White Papers
Spectrum Leasing Via Distributed Cooperation in Cognitive Radio
Jan 2008
The concept of cognitive radio (or secondary spectrum access) is currently under investigation as a promising paradigm to achieve efficient use of the frequency resource. In this paper, the...
Provided by New Jersey Institute of Technology
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White Papers
Scheduling for Multiuser MIMO Downlink Channels With Ranking-Based Feedback
Oct 2008
The authors consider a multi-antenna broadcast channel with more single-antenna receivers than transmit antennas and partial Channel State Information at the Transmitter (CSIT). They propose a...
Provided by University of Texas
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White Papers
Hybrid Pilot/Quantization Based Feedback in Multi-Antenna TDD Systems
Aug 2009
The communication between a multiple-antenna transmitter and multiple receivers (users) with either a single or multiple-antenna each can be significantly enhanced by providing the Channel State...
Provided by EURECOM
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White Papers
Robust Detection of OFDM Signals for Cognitive UWB in Low SNR With Noise Uncertainty
Jul 2008
Sensing the weak signals of primary users by cognitive UWB devices greatly challenges the capability of energy detector under noise uncertainty. This paper presents a simple and robust statistic...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Double Thresholds for Judgment in Cognitive Spectrum Sensing
Jul 2008
In cognitive radio system, secondary users should have capability of detecting the signal from primary user to evade interfering harmfully with any primary receiver. The duration used for spectrum...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Parametric Channel Estimation by Exploiting Hopping Pilots in Uplink OFDMA
Jul 2008
In this paper, a parametric channel estimation algorithm applicable to uplinks of Orthogonal Frequency Division Multiple Access (OFDMA) systems whose subcarriers are pseudo-randomly allocated is...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Low Complexity User Selection for MIMO Broadcast Channels
Jul 2008
A novel low complexity user selection strategy was proposed for MIMO broadcast channels, where zero-forcing beamforming was considered. As the number of simultaneously supportable users at the...
Provided by Institute of Electrical and Electronics Engineers
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