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mobile and wireless
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Mission Statement
TechRepublic's ITPapers is the Web's largest library of free technical IT white papers, webcasts, and case studies. Covering IT categories including Data Management, IT Management, Networking, Communications, Enterprise Applications, Storage, Security and much more, TechRepublic's White Paper Directory is the best source for technical white papers and IT information.
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White Papers
On the Feasibility of a Channel-Dependent Scheduling for the SC-FDMA in 3GPP-LTE (Mobile Environment) Based on a Prioritizedbifacet Hungarian Method
Sep 2011
The authors propose a methodology based on the prioritization and opportunistic reuse of the optimization algorithm known as Hungarian method for the feasible implementation of a channel-dependent...
Provided by Springer
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White Papers
Channel Length Assisted Symbol Synchronization for OFDM Systems in Multipath Fading Channels
Sep 2011
Despite the promising role of Orthogonal Frequency-Division Multiplexing (OFDM) technology in communication systems, its synchronization in multipath fading channels remains an important and...
Provided by Springer
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White Papers
DSC and Universal Bit-Level Combining for HARQ Systems
Sep 2011
This paper proposes a Dempster-Shafer theory based combining scheme for Single-Input Single-Output (SISO) systems with Hybrid Automatic Retransmission reQuest (HARQ), referred to as DSC, in which...
Provided by Springer
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White Papers
Multihop Relaying and Multiple Antenna Techniques: Performance Trade-Offs in Cellular Systems
Oct 2011
Two very important and active areas of wireless research are multihop relaying and multiple antenna techniques. Wireless multihop relaying can increase the aggregate network data capacity and...
Provided by Springer
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White Papers
A Review on Synchronous CDMA Systems: Optimum Overloaded Codes, Channel Capacity, and Power Control
Sep 2011
This paper is a review on important issues related to Code-Division Multiple-Access (CDMA) systems such as channel capacity, power control, and optimum codes; specifically, the authors consider...
Provided by Springer
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White Papers
The Promise of Downlink MU-MIMO for Highcapacity Next Generation Mobile Broadband Networks Based on IEEE 802.16 M
Sep 2011
The dramatic increase of the demand for mobile broadband services poses stringent requirements on the performance evolution of currently deployed mobile broadband networks, such as Mobile WiMAX...
Provided by Springer
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White Papers
TCP-Based Window-Size Delegation Method for TXOP Exchange in Wireless Local Area Networks
Oct 2011
The authors propose a TCP window-size delegation method for downlink TXOP (transmission opportunity) Exchange in Wireless Local Area Networks (WLANs). In their method, the 'Compliant' STAtions...
Provided by Springer
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White Papers
Resource Allocation for Maximizing Outage Throughput in OFDMA Systems With Finite-Rate Feedback
Sep 2011
Previous works on Orthogonal Frequency Division Multiple Access (OFDMA) systems with quantized Channel State Information (CSI) were mainly based on suboptimal quantization methods. In this paper,...
Provided by Springer
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White Papers
Evaluation of a TDMA-Based Energy Efficient MAC Protocol for Multiple Capsule Networks
Sep 2011
Wireless capsule endoscopy is a new kind of medical device, which monitors the gastrointestinal tract of the human body. It can be envisaged that in the future more than one capsule could be...
Provided by Springer
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White Papers
Localization and Dynamic Link Detection for Geographic Routing in Non-Line-Of-Sight (NLOS) Environments
Aug 2011
IEEE 802.15.4a networks can provide the geographic routing solution with high location accuracy for the indoor environments. However, in the Non-Line-Of-Sight (NLOS) environments, the IEEE...
Provided by Springer
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White Papers
In-Body Path Loss Models for Implants in Heterogeneous Human Tissues Using Implantable Slot Dipole Conformal Flexible Antennas
Aug 2011
A Wireless Body Area Network (WBAN) consists of a wireless network with devices placed close to, attached on, or implanted into the human body. Wireless communication within a human body...
Provided by Springer
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White Papers
An Adaptive Low-Power LDPC Decoder Using SNR Estimation
Aug 2011
Owing to advancement in 4G mobile communication and mobile TV, the throughput requirement in digital communication has been increasing rapidly. Thus, the need for efficient error-correcting codes...
Provided by Springer
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White Papers
An OFDMA Resource Allocation Algorithm Based on Coalitional Games
Aug 2011
This paper investigates a fair adaptive resource management criterion (in terms of transmit powers and subchannel assignment) for the uplink of an orthogonal frequency-division multiple access...
Provided by Springer
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White Papers
Coherence Time-Based Cooperative MAC Protocol for Wireless Ad Hoc Networks
Jun 2011
In this paper, the authors address the goal of achieving performance gains under heavy-load and fast fading conditions. CoopMACI protocol proposed in Proceedings of the IEEE International...
Provided by Springer
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White Papers
Preamble and Pilot Symbol Design for Channel Estimation in OFDM Systems With Null Subcarriers
Jun 2011
The authors have addressed the design of optimal preamble as well as suboptimal pilot symbols for channel estimation in OFDM systems with null subcarriers. First, they have formulated the channel...
Provided by Springer
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White Papers
Power Allocation Strategies for Distributed Precoded Multicell Based Systems
Jun 2011
Multicell cooperation is a promising solution for cellular wireless systems to mitigate intercell interference, improve system fairness, and increase capacity. In this paper, the authors propose...
Provided by Springer
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White Papers
Opportunistic Scheduling Policies for Improved Throughput Guarantees in Wireless Networks
Aug 2011
Offering throughput guarantees for cellular wireless networks, carrying real-time traffic, is of interest to both the network operators and the customers. In this paper, the authors formulate an...
Provided by Springer
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White Papers
Fairness Analysis of Throughput and Delay in WLAN Environments With Channel Diversities
Aug 2011
The paper investigates fairness in terms of throughput and packet delays among users with diverse channel conditions due to the mobility and fading effects in IEEE 802.11 WLAN (Wireless Local Area...
Provided by Springer
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White Papers
Orthogonal Beamforming Using Gram-Schmidt Orthogonalization for Multi-User MIMO Downlink System
Aug 2011
Simultaneous transmission to multiple users using orthogonal beamforming, known as Space-Division Multiple-Access (SDMA), is capable of achieving very high throughput in Multiple-Input...
Provided by Springer
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White Papers
Interference-Aware Receiver Structure for Multiuser MIMO and LTE
Aug 2011
In this paper, the authors propose a novel low-complexity interference-aware receiver structure for multi-user MIMO that is based on the exploitation of the structure of residual interference....
Provided by Springer
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White Papers
System Outage Probability Analysis in Uplink Multi-Hop Cellular Systems Over Composite Channels
Aug 2011
Owing to its superior performances, the multi-hop cellular system has drawn much attention in recent years. This paper aims to study the uplink system outage probability of the multi-hop cellular...
Provided by Springer
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White Papers
A Utility-Based Approach for Secondary Spectrum Sharing
Aug 2011
This paper provides a social welfare framework for coexistence of secondary users of spectrum in the presence of static primary users. The authors consider a formulation that captures spatial...
Provided by Springer
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White Papers
Handoff Optimization in 802.11 Wireless Networks
Jul 2011
In 802.11 wireless networks, a complete handoff procedure for a mobile node requires Access Point (AP) selection, AP switch, Call Admission Control (CAC), IP address re-allocation, and network...
Provided by Springer
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White Papers
Non-Regenerative Multi-Antenna Multi-Group Multi-Way Relaying
Aug 2011
The authors consider non-regenerative Multi-Group Multi-Way (MGMW) relaying. A half-duplex non-regenerative multi-antenna Relay Station (RS) assists multiple communication groups. In each group,...
Provided by Springer
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White Papers
ZAP: A Distributed Channel Assignment Algorithm for Cognitive Radio Networks
Aug 2011
The authors propose ZAP, an algorithm for the distributed channel assignment in Cognitive Radio (CR) networks. CRs are capable of identifying underutilized licensed bands of the spectrum, allowing...
Provided by Springer
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White Papers
Robustness of Digitally Modulated Signal Features Against Variation in HF Noise Model
Jul 2011
High Frequency (HF) band has both military and civilian uses. It can be used either as a primary or backup communication link. Automatic Modulation Classification (AMC) is of an utmost importance...
Provided by Springer
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White Papers
On the Lambert-W Function for Constrained Resource Allocation in Cooperative Networks
Jul 2011
In cooperative networks, a variety of resource allocation problems can be formulated as constrained optimization with system-wide objective, e.g., maximizing the total system throughput, capacity...
Provided by Springer
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White Papers
Differential Radio Map-Based Robust Indoor Localization
Jul 2011
While wireless local area network-based indoor localization is attractive, the problems concerning how to capture the signal-propagating character in the complex dynamic environment and how to...
Provided by Springer
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White Papers
CRLBs for WSNs Localization in NLOS Environment
Sep 2011
Determination of Cramer-Rao Lower Bound (CRLB) as an optimality criterion for the problem of localization in Wireless Sensor Networks (WSNs) is a very important issue. Currently, CRLBs have been...
Provided by Springer
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White Papers
Design of Zone-Based Bandwidth Management Scheme in IEEE 802.16 Multi-Hop Relay Networks
Jul 2011
IEEE 802.16 Wireless Network technology is a hot research issue in recent years. It provides wider coverage of radio and higher speed wireless access, and Quality-of-Service plays an important...
Provided by Springer
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White Papers
Two-Round Contributory Group Key Exchange Protocol for Wireless Network Environments
Jun 2011
With the popularity of group-oriented applications, secure group communication has recently received much attention from cryptographic researchers. A Group Key Exchange (GKE) protocol allows that...
Provided by Springer
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White Papers
Accuracy of Depolarization and Delay Spread Predictions Using Advanced Ray-Based Modeling in Indoor Scenarios
Jul 2011
This paper investigates the prediction accuracy of an advanced deterministic propagation model in terms of channel depolarization and frequency selectivity for indoor wireless propagation. In...
Provided by Springer
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White Papers
An Orthogonal Spectrum Sharing Scheme for Wireless Sensor Networks
Jul 2011
It is not economically viable to allocate a dedicated spectrum band to Wireless Sensor Networks (WSNs). Moreover, sharing a spectrum band with incumbent (primary) system compromises the...
Provided by Springer
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White Papers
Vector Perturbation Based Adaptive Distributed Precoding Scheme With Limited Feedback for CoMP Systems
Jul 2011
A downlink adaptive distributed precoding scheme is proposed for Coordinated Multi-Point (CoMP) transmission systems. The serving Base Station (BS) obtains the optimal precoding vector via user...
Provided by Springer
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White Papers
Binary De Bruijn Sequences for DS-CDMA Systems: Analysis and Results
Jul 2011
Code Division Multiple Access (CDMA) using Direct Sequence (DS) spread spectrum modulation provides multiple access capability essentially thanks to the adoption of proper sequences as spreading...
Provided by Springer
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White Papers
Using RELOAD and CoAP for Wide Area Sensor and Actuator Networking
Mar 2012
In this paper, the authors propose a new architecture for wide area sensor and actuator networking. The architecture is based on combining two protocols being standardized by the Internet...
Provided by EURASIP
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White Papers
Application of MIH for the Lightweight Deployment of LTE-Advanced Systems Through Mobile Relaying
Mar 2012
In a conventional cellular network end users connect directly to a Base Station (BS). Mobile relaying allows establishing an indirect two-hop link between the end user, called Mobile Node (MN),...
Provided by EURASIP
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White Papers
Evaluation of CACC String Stability Using SUMO, Simulink, and OMNeT++
Mar 2012
Recent development in wireless technology enables communication between vehicles. The concept of Co-operative Adaptive Cruise Control (CACC) - which uses wireless communication Recent development...
Provided by EURASIP
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White Papers
Network Coding-Based Multipath Routing for Energy Efficiency in Wireless Sensor Networks
Mar 2012
This paper studies the energy efficiency of wireless sensor networks with Network Coding-based Multipath Routing (NCMR). The employed multipath model is braided multipath model, and the network...
Provided by EURASIP
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White Papers
Hierarchical Spread Spectrum Fingerprinting Scheme Based on the CDMA Technique
Jan 2011
Digital fingerprinting is a method to insert user's own ID into digital contents in order to identify illegal users who distribute unauthorized copies. One of the serious problems in a...
Provided by Hindawi Publishing
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White Papers
Vibrate-to-Unlock: Mobile Phone Assisted User Authentication to Multiple Personal RFID Tags
Mar 2011
Personal RFID tags store valuable information private to their users that can easily be subject to eavesdropping, unauthorized reading, owner tracking, and cloning. RFID tags are also susceptible...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
An Efficient Localization Algorithm Focusing on Stop-and-Go Behavior of Mobile Nodes
Mar 2011
This paper presents a cooperative localization approach for mobile nodes using wireless and ranging devices. The authors consider scenarios where node mobility follows stop-and-go behavior; they...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Understanding and Using Rendezvous to Enhance Mobile Crowdsourcing Applications
Jun 2011
As mobile phones increasingly become general-purpose devices, phone manufacturers have integrated various sensors into them. For example, even low-end phones now include cameras, and mid-range...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
8 Reasons Why You Should Use Mobile Platforms in Your CS Courses
Mar 2011
Mobile computing represents yet another significant paradigm shift in computing. On a very fundamental level, it is changing the way computing integrates into the authors' daily lives, and also...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Performance Characterization of Mobile-Class Nodes: Why Fewer Bits is Better
Jan 2011
Mobile-class nodes cannot be considered just smaller versions of server-class or desktop-class nodes. Generalities that hold on server-class processors - for example, that moving to a 64-bit ISA...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Techniques for Fine-Grained, Multi-Site Computation Offloading
Jun 2011
Increasingly, mobile devices are becoming the preferred platform for computation for many users. Unfortunately, the resource limitations, in battery life, computation power and storage, restrict...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Design and Delivery of a Modern Mobile Application Programming Course : An Experience Report
May 2011
This paper presents the experience in the design and delivery of a modern mobile application programming course in an Information Technology program offered by a Canadian college. Due to the...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
A Novel Wireless Heterogeneous Data Mining (WHDM) Environment Based on Mobile Computing Environments
Mar 2011
Today the concept of Data Mining services is not alone sufficient. Data mining services play an important role in the field of Communication industry. Data mining is also called knowledge...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Platform-Wide Deadlock Immunity for Mobile Phones
Jan 2011
The authors present an implementation of their deadlock immunity system, Dimmunix, for mobile phone software. Within Android 2.2 OS, they modified Dalvik VM, the JVM running all the Android...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Computer Graphics: From Desktop to Mobile and Web
Aug 2011
Computer graphics has traditionally served as a motivational tool for teaching other topics. However, the authors noticed that their students weren't always motivated by this. Three years ago,...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Mobile Computing Systems and Applications
Jun 2011
The Twelfth Workshop on Mobile Computing Systems and Applications took place 1 - 2 March in Phoenix, Arizona. The paper format is well-suited to discussing new ideas, especially those that might...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Fingerprinting Mobile User Positions in Sensor Networks: Attacks and Countermeasures
Jul 2011
The authors demonstrate that the network flux over the sensor network provides fingerprint information about the mobile users within the field. Such information is exoteric in the physical space...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
MEPA: A New Protocol for Energy-Efficient, Distributed Clustering in Wireless Sensor Networks
Sep 2007
Clustering is an effective approach to hierarchically organizing network topology for efficient data aggregation in wireless sensor networks. Distributed protocols with simple local computations...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
A Location-Aware Key Predistribution Scheme for Distributed Wireless Sensor Networks
Jul 2007
Key establishment plays a central role in authentication and encryption in wireless sensor networks, especially when they are mainly deployed in hostile environments. Because of the strict...
Provided by Institute of Electrical and Electronics Engineers
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Downloads
Gamma Control 3.0 (Windows)
Oct 2011
Gamma Control v3 also offers custom hotkeys!With Gamma Control you can adjust the gamma on your computer. Let me give you an example of when to use it:If you are playing a game, lets say Counter...
Provided by DesktopNerds
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White Papers
Analysis of Energy Consumption in Direct Transmission and Multi-Hop Transmission for Wireless Sensor Networks
Nov 2007
In this paper, the authors primary focus on prolonging the network lifetime of Wireless Sensor Networks (WSN), since the small, portable batteries integrated into the sensor chips cannot be...
Provided by Kyung Hee University
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White Papers
Mobility-Assisted Relocation for Self-Deployment In Wireless Sensor Networks
Aug 2007
Sensor network deployment is very challenging due to the hostile and unpredictable nature of environments. The field coverage of Wireless Sensor Networks (WSNs) can be enhanced and consequently...
Provided by Institute of Electronics, Information and Communication Engineers
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White Papers
A Generic Localized Broadcast Framework in Mobile Ad Hoc Ubiquitous Sensor Networks
Dec 2007
In this paper, the authors investigate the critical low coverage problem of position aware localized efficient broadcast in mobile ad hoc ubiquitous sensor networks and propose a generic framework...
Provided by Institute of Electronics, Information and Communication Engineers
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White Papers
An Integrated Sleep-Scheduling and Routing Algorithm in Ubiquitous Sensor Networks Based on AHP
Dec 2007
Ubiquitous Sensor Networks (USNs) are comprised of energy constrained nodes. This limitation has led to the crucial need for energy-aware protocols to produce an efficient network. The authors...
Provided by Institute of Electronics, Information and Communication Engineers
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White Papers
Optimal Routing in Sensor Networks for In-Home Health Monitoring With Multi-Factor Considerations
Mar 2008
Recent technological advances in wireless sensor networking have opened up new opportunities in healthcare systems. Future medical systems are expected to benefit the most in such areas as in-home...
Provided by Kyung Hee University
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White Papers
Nonmetric MDS for Sensor Localization
Mar 2008
Multi-Dimensional Scaling (MDS) has been recently applied to node localization in sensor networks and gained some very impressive performance. MDS treats dissimilarities of pair-wise nodes...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
HGKM: A Group-Based Key Management Scheme for Sensor Networks Using Deployment Knowledge
Mar 2008
Key establishment plays a central role in authentication and encryption in wireless sensor networks, especially when they are mainly deployed in hostile environments. Because of the strict...
Provided by Kyung Hee University
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White Papers
Mapping of Activity Recognition as a Distributed Inference Problem in Sensor Network
May 2008
This paper presents a distributed model for detecting Activities of Daily Living (ADLs) in a home setting. The authors consider an environment where household devices and utensils are augmented...
Provided by Kyung Hee University
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White Papers
Selective Pulse Coupling Synchronicity for Sensor Network
Jun 2008
Simple, fast, low energy consumption time synchronization protocol is needed by sensor networks. Mutual interaction synchronization is highly attractive for wireless sensor network for its...
Provided by Kyung Hee University
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White Papers
Network Level Privacy For Wireless Sensor Networks
May 2008
Full network level privacy spectrum comprises of identity, route, location and data privacy. Existing privacy schemes of wireless sensor networks only provide partial network level privacy....
Provided by Kyung Hee University
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White Papers
A Hop-Based Energy Aware Routing Algorithm for Wireless Sensor Networks
Jul 2008
Wireless Sensor Networks (WSNs) have attracted quite attention due to their wide potential applications. Up to now, a huge amount of energy efficient routing protocols or algorithms have been...
Provided by Kyung Hee University
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White Papers
Trusting Anomaly and Intrusion Claims for Cooperative Distributed Intrusion Detection Schemes of Wireless Sensor Networks
Aug 2008
Any unidentified malicious nodes in the network could send faulty anomaly and intrusion claims about the legitimate nodes to the other nodes. Verifying the validity of such claims is a critical...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Lifetime Optimized Hierarchical Architecture for Correlated Data Gathering in Wireless Sensor Networks
Apr 2009
In-network aggregation is essential for correlated data gathering in wireless sensor networks which are resource-constraint in terms of energy, computation and storage. In this paper, the authors...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Distributed Localization in Wireless Sensor Networks Based on Force-Vectors
Apr 2009
Node Localization is a fundamental requirement for deploying real wireless sensor network applications such as hospital logistics, environmental monitoring, and target surveillance. However,...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
An Energy-Efficient Secure Routing and Key Management Scheme for Mobile Sinks in Wireless Sensor Networks Using Deployment Knowledge
Dec 2008
For many sensor network applications such as military or homeland security, it is essential for users (sinks) to access the sensor network while they are moving. Sink mobility brings new...
Provided by Kyung Hee University
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White Papers
Enhanced Group-Based Key Management Scheme for Wireless Sensor Networks Using Deployment Knowledge
Apr 2009
Key establishment plays a central role in authentication and encryption in wireless sensor networks, especially when they are mainly deployed in hostile environments. Because of the strict...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Energy Consumption Analysis of Reputation-Based Trust Management Schemes of Wireless Sensor Networks
Jan 2009
Energy consumption is one of the most important parameters for evaluation of a scheme proposed for WSNs because of their resource constraint nature. Comprehensive comparative analysis of proposed...
Provided by Association for Computing Machinery
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White Papers
A Performance Comparison of Swarm Intelligence Inspired Routing Algorithms for MANETs
Jul 2009
Swarm Intelligence (SI) inspired routing algorithms have become a research focus in recent years due to their self-organizing nature, which is very suitable to the routing problems in Mobile Ad...
Provided by Springer Science+Business Media
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White Papers
Localization in Sensor Networks With Fading Channels Based on Nonmetric Distance Models
Jul 2009
Wireless Sensor Network (WSN) applications nowadays are an emerging avenue in which sensor localization is an essential and crucial issue. Many algorithms have been proposed to estimate the...
Provided by Springer Science+Business Media
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White Papers
Simple Hash Based Message Authentication Scheme for Wireless Sensor Networks
Jul 2009
In this paper, the authors propose simple hash based message authentication and integrity code algorithm for wireless sensor networks. The proposed scheme uses pre-shared secret key which is...
Provided by Kyung Hee University
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White Papers
Broadcast Gossip Based Distributed Hypothesis Testing in Wireless Sensor Networks
Aug 2009
The authors consider the scenario that N sensors collaborate to observe a single event. The sensors are distributed and can only exchange messages through a network to reach a consensus about the...
Provided by Kyung Hee University
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White Papers
Distortion-Optimized Retransmission for Low-Delay Robust Video Communications Over 802.11 Intervehicle Ad Hoc Networks
Sep 2007
Wireless Access in Vehicular Environment (WAVE) communications standards have recently been approved for trial use and other standards, such as 802.11p, are under active development. However,...
Provided by Association for Computing Machinery
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White Papers
ADHOCSYS: Robust and Service-Oriented Wireless Mesh Networks to Bridge the Digital Divide
Sep 2007
While various wireless mesh networks are being deployed in urban areas and university campuses for diverse purposes, less effort has been devoted to use such networks for broadband access in rural...
Provided by University Graduate Center
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White Papers
BARI: A Distributed Key Management Approach for Wireless Body Area Networks
Oct 2009
In recent years, use of sensors to measure the biometrics and movements of human body have resulted in the design of wireless body area networks (WBAN). Although WBANs consist of resource...
Provided by Kyung Hee University
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White Papers
Application-Aware Optimization of Packet Scheduling for Video Communications Over Intervehicle Ad Hoc Networks
Jun 2008
This paper focuses on optimizing real-time intervehicle video communications from an image analysis perspective. Differently from traditional multimedia communication schemes which are typically...
Provided by Institute of Electrical and Electronics Engineers
-
White Papers
An OFDMA Resource Allocation Algorithm Based on Coalitional Games
Aug 2011
This paper investigates a fair adaptive resource management criterion (in terms of transmit powers and subchannel assignment) for the uplink of an orthogonal frequency-division multiple access...
Provided by Springer
-
White Papers
Coherence Time-Based Cooperative MAC Protocol for Wireless Ad Hoc Networks
Jun 2011
In this paper, the authors address the goal of achieving performance gains under heavy-load and fast fading conditions. CoopMACI protocol proposed in Proceedings of the IEEE International...
Provided by Springer
-
White Papers
Preamble and Pilot Symbol Design for Channel Estimation in OFDM Systems With Null Subcarriers
Jun 2011
The authors have addressed the design of optimal preamble as well as suboptimal pilot symbols for channel estimation in OFDM systems with null subcarriers. First, they have formulated the channel...
Provided by Springer
-
White Papers
Power Allocation Strategies for Distributed Precoded Multicell Based Systems
Jun 2011
Multicell cooperation is a promising solution for cellular wireless systems to mitigate intercell interference, improve system fairness, and increase capacity. In this paper, the authors propose...
Provided by Springer
-
White Papers
Opportunistic Scheduling Policies for Improved Throughput Guarantees in Wireless Networks
Aug 2011
Offering throughput guarantees for cellular wireless networks, carrying real-time traffic, is of interest to both the network operators and the customers. In this paper, the authors formulate an...
Provided by Springer
-
White Papers
Fairness Analysis of Throughput and Delay in WLAN Environments With Channel Diversities
Aug 2011
The paper investigates fairness in terms of throughput and packet delays among users with diverse channel conditions due to the mobility and fading effects in IEEE 802.11 WLAN (Wireless Local Area...
Provided by Springer
-
White Papers
Orthogonal Beamforming Using Gram-Schmidt Orthogonalization for Multi-User MIMO Downlink System
Aug 2011
Simultaneous transmission to multiple users using orthogonal beamforming, known as Space-Division Multiple-Access (SDMA), is capable of achieving very high throughput in Multiple-Input...
Provided by Springer
-
White Papers
Interference-Aware Receiver Structure for Multiuser MIMO and LTE
Aug 2011
In this paper, the authors propose a novel low-complexity interference-aware receiver structure for multi-user MIMO that is based on the exploitation of the structure of residual interference....
Provided by Springer
-
White Papers
System Outage Probability Analysis in Uplink Multi-Hop Cellular Systems Over Composite Channels
Aug 2011
Owing to its superior performances, the multi-hop cellular system has drawn much attention in recent years. This paper aims to study the uplink system outage probability of the multi-hop cellular...
Provided by Springer
-
White Papers
A Utility-Based Approach for Secondary Spectrum Sharing
Aug 2011
This paper provides a social welfare framework for coexistence of secondary users of spectrum in the presence of static primary users. The authors consider a formulation that captures spatial...
Provided by Springer
-
White Papers
Handoff Optimization in 802.11 Wireless Networks
Jul 2011
In 802.11 wireless networks, a complete handoff procedure for a mobile node requires Access Point (AP) selection, AP switch, Call Admission Control (CAC), IP address re-allocation, and network...
Provided by Springer
-
White Papers
Non-Regenerative Multi-Antenna Multi-Group Multi-Way Relaying
Aug 2011
The authors consider non-regenerative Multi-Group Multi-Way (MGMW) relaying. A half-duplex non-regenerative multi-antenna Relay Station (RS) assists multiple communication groups. In each group,...
Provided by Springer
-
White Papers
ZAP: A Distributed Channel Assignment Algorithm for Cognitive Radio Networks
Aug 2011
The authors propose ZAP, an algorithm for the distributed channel assignment in Cognitive Radio (CR) networks. CRs are capable of identifying underutilized licensed bands of the spectrum, allowing...
Provided by Springer
-
White Papers
Robustness of Digitally Modulated Signal Features Against Variation in HF Noise Model
Jul 2011
High Frequency (HF) band has both military and civilian uses. It can be used either as a primary or backup communication link. Automatic Modulation Classification (AMC) is of an utmost importance...
Provided by Springer
-
White Papers
On the Lambert-W Function for Constrained Resource Allocation in Cooperative Networks
Jul 2011
In cooperative networks, a variety of resource allocation problems can be formulated as constrained optimization with system-wide objective, e.g., maximizing the total system throughput, capacity...
Provided by Springer
-
White Papers
Differential Radio Map-Based Robust Indoor Localization
Jul 2011
While wireless local area network-based indoor localization is attractive, the problems concerning how to capture the signal-propagating character in the complex dynamic environment and how to...
Provided by Springer
-
White Papers
CRLBs for WSNs Localization in NLOS Environment
Sep 2011
Determination of Cramer-Rao Lower Bound (CRLB) as an optimality criterion for the problem of localization in Wireless Sensor Networks (WSNs) is a very important issue. Currently, CRLBs have been...
Provided by Springer
-
White Papers
Design of Zone-Based Bandwidth Management Scheme in IEEE 802.16 Multi-Hop Relay Networks
Jul 2011
IEEE 802.16 Wireless Network technology is a hot research issue in recent years. It provides wider coverage of radio and higher speed wireless access, and Quality-of-Service plays an important...
Provided by Springer
-
White Papers
Two-Round Contributory Group Key Exchange Protocol for Wireless Network Environments
Jun 2011
With the popularity of group-oriented applications, secure group communication has recently received much attention from cryptographic researchers. A Group Key Exchange (GKE) protocol allows that...
Provided by Springer
-
White Papers
Accuracy of Depolarization and Delay Spread Predictions Using Advanced Ray-Based Modeling in Indoor Scenarios
Jul 2011
This paper investigates the prediction accuracy of an advanced deterministic propagation model in terms of channel depolarization and frequency selectivity for indoor wireless propagation. In...
Provided by Springer
-
White Papers
An Orthogonal Spectrum Sharing Scheme for Wireless Sensor Networks
Jul 2011
It is not economically viable to allocate a dedicated spectrum band to Wireless Sensor Networks (WSNs). Moreover, sharing a spectrum band with incumbent (primary) system compromises the...
Provided by Springer
-
White Papers
Vector Perturbation Based Adaptive Distributed Precoding Scheme With Limited Feedback for CoMP Systems
Jul 2011
A downlink adaptive distributed precoding scheme is proposed for Coordinated Multi-Point (CoMP) transmission systems. The serving Base Station (BS) obtains the optimal precoding vector via user...
Provided by Springer
-
White Papers
Binary De Bruijn Sequences for DS-CDMA Systems: Analysis and Results
Jul 2011
Code Division Multiple Access (CDMA) using Direct Sequence (DS) spread spectrum modulation provides multiple access capability essentially thanks to the adoption of proper sequences as spreading...
Provided by Springer
-
White Papers
Using RELOAD and CoAP for Wide Area Sensor and Actuator Networking
Mar 2012
In this paper, the authors propose a new architecture for wide area sensor and actuator networking. The architecture is based on combining two protocols being standardized by the Internet...
Provided by EURASIP
-
White Papers
Application of MIH for the Lightweight Deployment of LTE-Advanced Systems Through Mobile Relaying
Mar 2012
In a conventional cellular network end users connect directly to a Base Station (BS). Mobile relaying allows establishing an indirect two-hop link between the end user, called Mobile Node (MN),...
Provided by EURASIP
-
White Papers
Evaluation of CACC String Stability Using SUMO, Simulink, and OMNeT++
Mar 2012
Recent development in wireless technology enables communication between vehicles. The concept of Co-operative Adaptive Cruise Control (CACC) - which uses wireless communication Recent development...
Provided by EURASIP
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White Papers
Network Coding-Based Multipath Routing for Energy Efficiency in Wireless Sensor Networks
Mar 2012
This paper studies the energy efficiency of wireless sensor networks with Network Coding-based Multipath Routing (NCMR). The employed multipath model is braided multipath model, and the network...
Provided by EURASIP
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White Papers
Hierarchical Spread Spectrum Fingerprinting Scheme Based on the CDMA Technique
Jan 2011
Digital fingerprinting is a method to insert user's own ID into digital contents in order to identify illegal users who distribute unauthorized copies. One of the serious problems in a...
Provided by Hindawi Publishing
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White Papers
On Equilibrium Analysis of Acyclic Multiclass Loss Networks Under Admission Control
May 2011
The authors consider equilibrium analysis of several dynamic resource sharing policies for multiclass loss networks with acyclic topologies. The policies of interest are based on the principle of...
Provided by Boston University
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White Papers
On the Impact of Coarse Synchronization on the Performance of Broadcast/Multicast Single Frequency Network Operation in WCDMA
Mar 2008
The authors evaluate the system-level performance and potential capacity gain of MBSFN (Multicast/Broadcast Single Frequency Network) operation in Wideband CDMA (WCDMA) and compare it to...
Provided by QUALCOMM
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White Papers
Performance Evaluation of Multicast/Broadcast Single Frequency Network Operation for WCDMA
Jan 2012
Multicast/broadcast networks are designed for supporting potentially large user groups where many users are subscribing simultaneously to the same content, as, for example, in the case of mobile...
Provided by QUALCOMM
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White Papers
Performance Study on Cooperative Relaying Topologies in Beyond 3G Systems
Apr 2008
Relaying has been proposed to support users suffering from high shadowing or high interference and therefore being not able to receive high data rates. With adaptive relaying, a higher Modulation...
Provided by University of Applied Sciences
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White Papers
A New Approach for Efficient MBMS Service Provision in UTRAN
Apr 2008
As currently specified by 3GPP, MBMS services can be provided in a cell either by Point-to-Point (PtP) or Point-to-Multipoint (PtM) transmission mode, but not both at the same time. With PtP...
Provided by University of Cyprus
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White Papers
Advanced Multicast and Broadcast Content Distribution in Mobile Cellular Networks
Aug 2007
Recently 3GPP (Third Generation Partnership Project) has standardised MBMS (Multimedia Broadcast Multicast Services) enabling broadcast and multicast transmissions over GPRS (General Packet Radio...
Provided by University of the West of England
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White Papers
Enabling IMS With Multicast and Broadcast Capabilities
Jul 2007
The evolution of third generation cellular network focuses on the provision of enriched multimedia services and the support of QoS (Quality of Service) guarantees. The IMS (IP Multimedia...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Interferer Nulling Based on Neighborhood Communication Patterns
Jul 2007
Smart antennas have a number of useful properties that help to improve the performance of wireless devices. Beamforming allows to emit power in a given sector around a device, by phase shifting...
Provided by Technische Universitat Munchen
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Case Studies
Transforming Networking and Server Administration
Feb 2012
FASTWEB SpA telecommunications industry, their challenges are to improve management at virtual machine level and speed up troubleshooting and deployment of new services. They chose Cisco to...
Provided by Cisco Systems
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Case Studies
WorldTelemetry: Wireless Asset Monitoring and Management Control
Jul 2007
WorldTelemetry, Inc. is an end-to-end solution providing asset monitoring and management control systems for companies. They needed a reliable communications method from which to build their...
Provided by Multi-Tech Systems
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Case Studies
Proving Grounds: The University of Minnesota Demonstrates Proof-of-Concept With the MultiConnect OCG
Sep 2011
The University of Minnesota, they needed a way to test their concept that the existing cellular infrastructure could be used to help record the Vehicle Miles Traveled (VMT) for a given vehicle...
Provided by Multi-Tech Systems
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Case Studies
Saving Money and Beating the Competition to Market With the Multi-Tech SocketModem Embedded Cellular Modem
Aug 2011
Electronic Sensors, Inc. (ESI) manufactures the Level Devil line of monitoring equipment for bulk storage tanks. ESI faced the challenges of developing a product that could reliably relay the...
Provided by Multi-Tech Systems
