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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
Multiuser MIMO Downlink Transmission With BEM-Based Limited Feedback Over Doubly Selective Channels
Jan 2012
This paper studies the problem of limited feedback design for heterogeneous MultiUser (MU) transmissions over time- and frequency-selective (doubly selective) multiple-input multiple-output...
Provided by Springer
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White Papers
SIR Distribution Analysis in Cellular Networks Considering the Joint Impact of Path-Loss, Shadowing and Fast Fading
Nov 2011
In this paper, the authors propose an analysis of the joint impact of path-loss, shadowing and fast fading on cellular networks. Two analytical methods are developed to express the outage...
Provided by Springer
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White Papers
Beamforming Techniques for Enabling Spatialreuse in MCCA 802.11s Networks
Nov 2011
The authors address the problem of Co-Channel Interference (CCI) in wireless mesh networks based on the IEEE802.11s extension. The carrier sensing mechanism deployed in those networks...
Provided by Springer
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White Papers
Improved and Weighted Sum Rate Maximization for Successive Zero-Forcing in Multiuser MIMO Systems
Feb 2012
The authors propose an improved algorithm for optimizing the transmit covariance matrices for Successive Zero-Forcing (SZF) precoding in multiple-input multiple-output systems. They use a...
Provided by Springer
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White Papers
Multistage Quadrature Sigma-Delta Modulators for Reconfigurable Multi-Band Analog-Digital Interface in Cognitive Radio Devices
Feb 2012
Nowadays, a growing number of parallel wireless communication standards, together with ever-increasing traffic amounts, create a widely acknowledged need for novel radio solutions, such as...
Provided by Springer
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White Papers
Average Minimum Transmit Power to Achieve SINR Targets: Performance Comparison of Various User Selection Algorithms
Nov 2011
In multi-user communication from one Base Station (BS) to multiple users, the problem of minimizing the transmit power to achieve some target-guaranteed performance (rates) at users has been well...
Provided by Springer
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White Papers
PAPR Reduction of OFDM Signals Using PTS: A Real-Valued Genetic Approach
Nov 2011
The Partial Transmit Sequences (PTS) scheme achieves an excellent Peak-to-Average Power Ratio (PAPR) reduction performance of Orthogonal Frequency Division Multiplexing (OFDM) signals at the cost...
Provided by Springer
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White Papers
Constrained Power Allocation Schemes for Coordinated Base Station Transmission Using Block Diagonalization
Nov 2011
In this paper, the authors propose several power allocation schemes in a coordinated base station downlink transmission with per antenna and per base station power constraints. Block...
Provided by Springer
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White Papers
A Fast Iterative Localized Re-Authentication Protocol for UMTS-WLAN Heterogeneous Mobile Communication Networks
Nov 2011
UMTS-WLAN heterogeneous mobile networks allow a single mobile user with different radio technologies to access different mobile networks, but how to secure such inter-working networks and provide...
Provided by Springer
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White Papers
Impact of the Environment and the Topology on the Performance of Hierarchical Body Area Networks
Nov 2011
Personal area networks and, more specifically, Body Area Networks (BANs) are key building blocks of future generation networks and of the Internet of Things as well. In this paper, the authors...
Provided by Springer
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White Papers
Two-Way Relaying Using Constant Envelope Modulation and Phase-Superposition-Phase-Forward
Nov 2011
In this paper, the authors propose the idea of Phase-Superposition-Phase-Forward (PSPF) relaying for 2-way 3-phase cooperative network involving constant envelope modulation with discriminator...
Provided by Springer
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White Papers
Slotted Aloha With Multi-AP Diversity and APS Transmit Beamforming
Nov 2011
Slotted Aloha is an effective random access protocol and can also be an important element of more advanced media access protocols. This paper investigates slotted Aloha in a radio environment with...
Provided by Springer
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White Papers
Mobile User-Preference-Based Data Dissemination on Mobile P2P Networks
Nov 2011
A considerable number of studies have been performed recently on MObile Peer-to-peer NETworks (MOPNETs), as the number of services based on mobile devices has increased. However, existing studies...
Provided by Springer
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White Papers
Clustering and OFDMA-Based MAC Protocol (COMAC) for Vehicular Ad Hoc Networks
Nov 2011
The IEEE community is working on the wireless access in vehicular environments as a main technology for vehicular ad hoc networks. The Medium Access Control (MAC) protocol of this system known as...
Provided by Springer
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White Papers
The Impact of Spatial Correlation on the Statistical Properties of the Capacity of Nakagami-M Channels With MRC and EGC
Nov 2011
In this paper, the authors have studied the statistical properties of the instantaneous channel capacity of spatially correlated Nakagami-m channels for two different diversity combining methods,...
Provided by Springer
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White Papers
Minimum-Length Scheduling With Rate Control in Wireless Networks: A Shortest Path Approach
Dec 2011
In this paper, the minimum-length scheduling problem in wireless networks is studied, where each source of traffic has a finite amount of data to deliver to its corresponding destination. The...
Provided by Springer
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White Papers
Hidden Node Aware Routing Method Using Highsensitive Sensing Device for Multi-Hop Wireless Mesh Network
Oct 2011
Throughput maximization is one of the main challenges in multi-hop Wireless Mesh Network (WMN). Throughput of the multi-hop WMN network seriously degrades due to the presence of the hidden node....
Provided by Springer
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White Papers
A New and Efficient Adaptive Scheduling Packets for the Uplink Traffic in WiMAX Networks
Nov 2011
In this paper, an adaptive scheduling packets algorithm for the uplink traffic in WiMAX networks is proposed. The proposed algorithm is designed to be completely dynamic, mainly in networks that...
Provided by Springer
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White Papers
Minimum Decoding Trellis Length and Truncation Depth of Wrap-Around Viterbi Algorithm for TBCC in Mobile WiMAX
Nov 2011
The performance of the wrap-around Viterbi decoding algorithm with finite truncation depth and fixed decoding trellis length is investigated for tail-biting convolutional codes in the mobile WiMAX...
Provided by Springer
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White Papers
Hadamard Upper Bound on Optimum Joint Decoding Capacity of Wyner Gaussian Cellular MAC
Nov 2011
This paper presents an original analytical expression for an upper bound on the optimum joint decoding capacity of Wyner Circular Gaussian Cellular Multiple Access Channel (C-GCMAC) for uniformly...
Provided by Springer
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White Papers
A New Reduced-Complexity Detection Scheme for Zero-Padded OFDM Transmissions
Oct 2011
Recently, Zero-Padding Orthogonal Frequency Division Multiplexing (ZP-OFDM) has been proposed as an alternative solution to the traditional Cyclic Prefix (CP)-OFDM, to ensure symbol recovery...
Provided by Springer
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White Papers
BOB-RED Queue Management for IEEE 802.15.4 Wireless Sensor Networks
Oct 2011
Multimedia services over resource constrained Wireless Sensor Networks (WSNs) face a performance bottleneck issue from the gateway node to the sink node. Therefore, the queue management at the...
Provided by Springer
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White Papers
Dynamic Tuning of the IEEE 802.11 Distributed Coordination Function to Derive a Theoretical Throughput Limit
Oct 2011
IEEE 802.11 is the most popular and widely used standard for wireless local area network communication. It has attracted countless numbers of studies devoted to improving the performance of the...
Provided by Springer
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White Papers
Optimized Combination Model and Algorithm of Parking Guidance Information Configuration
Oct 2011
Operators of Parking Guidance and Information (PGI) systems often have difficulty in providing the best car park availability information to drivers in periods of high demand. A new PGI...
Provided by Springer
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White Papers
A Network Resource Availability Model for IEEE802.11a/b-Based WLAN Carrying Different Service Types
Oct 2011
Operators of integrated wireless systems need to have knowledge of the resource availability in their different access networks to perform efficient admission control and maintain good quality of...
Provided by Springer
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White Papers
Hop-Distance Relationship Analysis With Quasi-UDG Model for Node Localization in Wireless Sensor Networks
Oct 2011
In Wireless Sensor Networks (WSNs), location information plays an important role in many fundamental services which includes geographic routing, target tracking, location-based coverage, topology...
Provided by Springer
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White Papers
Cross-Layer Based Adaptive Wireless Traffic Control for Per-Flow and Per-Station Fairness
Sep 2011
In the IEEE 802.11 wireless LANs, the bandwidth is not fairly shared among stations due to the Distributed Coordination Function (DCF) mechanism in the IEEE 802.11 MAC protocol. It introduces the...
Provided by Springer
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White Papers
Sleep/wake Scheduling Scheme for Minimizing End-to-End Delay in Multi-Hop Wireless Sensor Networks
Oct 2011
The authors present a sleep/wake schedule protocol for minimizing end-to-end delay for event driven multi-hop wireless sensor networks. In contrast to generic sleep/wake scheduling schemes, their...
Provided by Springer
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White Papers
Novel Low-PAPR Parallel FSOK Transceiver Design for MC-CDMA System Over Multipath Fading Channels
Nov 2011
A low Peak-to-Average Power Ratio (PAPR) transceiver using a new parallel Frequency-Shift Orthogonal Keying (FSOK) technique is proposed for the multiuser uplink Multi-Carrier CDMA (MC-CDMA)...
Provided by Springer
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White Papers
IDEA1: A Validated SystemC-Based System-Level Design and Simulation Environment for Wireless Sensor Networks
Feb 2012
This paper presents IDEA1, a SystemC-based system-level design and simulation framework for WSNs. It allows the performance evaluation (e.g., packet delivery rate, transmission latency and energy...
Provided by Springer
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White Papers
Reconfigurable Antennas and Configuration Selection Methods for MIMO Ad Hoc Networks
Dec 2011
In this paper, the authors quantify the performance enhancements that can be provided by reconfigurable antennas in an ad hoc network where all nodes employ multiple input multiple output...
Provided by Springer
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White Papers
Performance Analysis of MIMO-SESS With Alamouti Scheme Over Rayleigh Fading Channels
Dec 2011
Self-Encoded Spread Spectrum (SESS) is a novel modulation technique that acquires its spreading sequence from the random input data stream rather than through the use of the traditional...
Provided by Springer
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White Papers
Call Admission Control With Heterogeneous Mobile Stations in Cellular/WLAN Interworking Systems
Oct 2011
Although different Call Admission Control (CAC) schemes have been proposed for cellular-wireless local area network (WLAN) inter-working systems, no studies consider Mobile Stations (MSs) only...
Provided by Springer
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White Papers
Enhancing Role-Based Trust Management With a Reputation System for MANETs
Sep 2011
The authors start with Role-Based Trust Management (RBTM) and address some of the challenges associated with using RBTM in Mobile Ad hoc NETworks (MANETs). They, then enhance RBTM with Reputation...
Provided by Springer
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White Papers
Performance Analysis for Optimum Transmission and Comparison With Maximal Ratio Transmission for MIMO Systems With Cochannel Interference
Sep 2011
This paper presents the performance analysis of Multiple-Input/Multiple-Output (MIMO) systems with Quadrature Amplitude Modulation (QAM) transmission in the presence of Co-Channel Interference...
Provided by Springer
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White Papers
Implementation and Investigation of Circular Slot UWB Antenna With Dual-Band-Notched Characteristics
Oct 2011
The design and analysis of an ultra wideband aperture antenna with dual-band-notched characteristics are presented. The proposed antenna consists of a circular ring exciting stub on the front side...
Provided by Springer
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White Papers
A Scalable Multi-Sink Gradient-Based Routing Protocol for Traffic Load Balancing
Oct 2011
Wireless sensor networks have been assumed to consist of a single sink and multiple sensor nodes which do not have mobility. In these networks, sensor nodes near the sink dissipate their energy so...
Provided by Springer
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White Papers
Transmission Scheduling for Wireless Mesh Networks With Temporal Reuse
Sep 2011
Link-assigned transmission schedules with timeslot reuse by multiple links in both the space and time domains are investigated in this paper for stationary multihop wireless mesh networks with...
Provided by Springer
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White Papers
On the Capacity of Rayleigh-Fading Correlated Spectrum Sharing Networks
Sep 2011
Recently, substantial attention has been paid to improve the spectral efficiency of communication setups using different spectrum sharing techniques. This paper aims to study the capacity of...
Provided by Springer
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White Papers
Frequency Domain Equalization Space-Time Block-Coded CDMA Transmission System
Sep 2011
In this paper, the authors propose a Space-Time Block-Coded (STBF) CDMA transmission system suitable for use with Frequency Domain Equalization (FDE) algorithms. They illustrate the FDE by...
Provided by Springer
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White Papers
Fluid Model of the Outage Probability in Sectored Wireless Networks
Dec 2007
The authors establish a closed form formula of the other-cell interference factor f for omni-directional and sectored cellular networks, as a function of the location of the mobile. That formula...
Provided by Telecom ParisTech
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White Papers
SMDP Approach for JRRM Analysis in Heterogeneous Networks
Apr 2008
In this paper, the authors study Joint Radio Resource Management (JRRM) in heterogeneous networks and they propose a way of achieving optimality. The authors consider a micro, pico or femto cell...
Provided by Telecom ParisTech
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White Papers
Effect of Distributed Subcarrier Permutation on Adaptive Beamforming in WiMAX Networks
Jun 2008
In this paper, the authors investigate the performance of adaptive beamforming while using subcarrier permutation PUSC in WiMAX cellular network. In the literature, it has been shown that...
Provided by Telecom ParisTech
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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
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White Papers
On the Impact of Mobility on Outage Probability in Cellular Networks
Dec 2008
In this paper, the authors develop an analytical study of the mobility in cellular networks and its impact on quality of service and outage probability. They first express analytically the...
Provided by Telecom ParisTech
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White Papers
A Novel Mechanism for Contention-Based Initial Ranging in IEEE 802.16e Networks
Jan 2009
The paper proposes a Waiting-time Dependent Increasing rate Adapted Backoff (WDIA) algorithm to improve the contention efficiency in the IEEE 802.16e. A contention model is first proposed to...
Provided by Telecom ParisTech
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White Papers
Reuse 1 in WiMAX Networks With Beamforming
Apr 2009
In this paper, the authors examine the performance of adaptive beamforming in connection with three different subcarrier permutation schemes (PUSC, FUSC and AMC) in WiMAX cellular network with...
Provided by Telecom ParisTech
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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
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White Papers
An Efficient Analytical Model for the Dimensioning of WiMAX Networks
Mar 2009
This paper tackles the challenging task of developing a simple and accurate analytical model for performance evaluation of WiMAX networks. The need for accurate and fast-computing tools is of...
Provided by Universite Pierre et Marie Curie
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White Papers
An Analytical Model for WiMAX Networks With Multiple Traffic Profiles and Throttling Policy
Apr 2009
In this paper, the authors present a simple and accurate analytical model for performance evaluation of WiMAX networks with multiple traffic profiles. This very promising access technology has...
Provided by Telecom ParisTech
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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
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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
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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
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White Papers
Outage Probability in a Multi-Cellular Network Using Alamouti Scheme
Feb 2010
In this paper the authors analyze the performance of a downlink single user multi-cellular Multiple Inputs Single Output (MISO) system using the Alamouti code. The authors derive, for the first...
Provided by Telecom ParisTech
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White Papers
Limiting Power Transmission of Green Cellular Networks: Impact on Coverage and Capacity
Feb 2010
Reducing power transmission is of primary importance in future green cellular networks. First of all, the induced reduction of the interference encourages the deployment of opportunistic radios in...
Provided by Telecom ParisTech
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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
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White Papers
An Efficient Tabu Search DSA Algorithm for Heterogeneous Traffic in Cellular Networks
Sep 2010
In this paper, the authors propose and analyze a TS (Tabu Search) algorithm for DSA (Dynamic Spectrum Access) in cellular networks. They consider a scenario where cellular operators share a common...
Provided by Telecom ParisTech
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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
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White Papers
An Untold Story of Middleboxes in Cellular Networks
Aug 2011
The use of cellular data networks is increasingly popular as network coverage becomes more ubiquitous and many diverse user-contributed mobile applications become available. The growing cellular...
Provided by Association for Computing Machinery
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White Papers
How to Set the Fractional Power Control Compensation Factor in LTE?
Apr 2011
The uplink power control procedure in Long Term Evolution (LTE) cellular networks is made of an open-loop part and a closed loop part. In this paper, the authors focus on the former and study the...
Provided by Telecom ParisTech
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White Papers
Relays-Enhanced LTE-Advanced Networks Performance Studies
Apr 2011
This paper proposes a study on the performance of multi-hop relays networks. The authors demonstrate the importance of the relays for coverage and capacity enhancement and study how the number of...
Provided by Telecom ParisTech
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White Papers
Dynamic System Performance of SISO, MISO and MIMO Alamouti Schemes
Apr 2011
MIMO systems have been deeply investigated during the last years. They have been proven to achieve better performance in terms of capacity through the multiplexing gain and in terms of reliability...
Provided by Telecom ParisTech
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White Papers
Insomnia in the Access
Aug 2011
The biggest fraction of wired network energy is consumed by the access network, even though the individual access devices themselves have small power requirements. Unfortunately, straightforward...
Provided by Association for Computing Machinery
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White Papers
Analytical Performance Evaluation of Various Frequency Reuse and Scheduling Schemes in Cellular OFDMA Networks
May 2009
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 Telecom ParisTech
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White Papers
An Efficient Analytical Model for the Dimensioning of WiMAX Networks Supporting Multi-Profile Best Effort Traffic
Jan 2010
This paper tackles the challenging task of developing a simple and accurate analytical model for performance evaluation of WiMAX networks. The need for accurate and fast-computing tools is of...
Provided by Telecom ParisTech
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White Papers
A Fluid Model for Performance Analysis in Cellular Networks
Jun 2010
In this paper, the authors propose a new framework to study the performance of cellular networks using a fluid model and they derive from this model analytical formulas for interference, outage...
Provided by Telecom ParisTech
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White Papers
Optimal, Heuristic and Q-Learning Based DSA Policies for Cellular Networks With Coordinated Access Band
Nov 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 Agency for Enterprise Information Technology
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White Papers
Spectrum Auction With Interference Constraint for Cognitive Radio Networks With Multiple Primary and Secondary Users
May 2011
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 Springer Science+Business Media
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White Papers
Effect of Shadowing on Outage Probability in Fluid Cellular Radio Networks
Feb 2008
The authors propose an adaptive model for the study of cellular networks called the fluid model, useful to each specific network environment characterized by the radio propagation (distance...
Provided by Telecom ParisTech
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White Papers
Clearing the RF Smog: Making 802.11 Robust to Cross-Technology Interference
Aug 2011
Recent studies show that high-power cross-technology interference is becoming a major problem in today's 802.11 networks. Devices like baby monitors and cordless phones can cause a wireless LAN to...
Provided by Association for Computing Machinery
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White Papers
Strider: Automatic Rate Adaptation and Collision Handling
Aug 2011
This paper presents the design, implementation and evaluation of Strider, a system that automatically achieves almost the optimal rate adaptation without incurring any overhead. The key component...
Provided by Association for Computing Machinery
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White Papers
Random Access Heterogeneous MIMO Networks
Aug 2011
This paper presents the design and implementation of 802.11n+, a fully distributed random access protocol for MIMO networks. 802.11n+ allows nodes that differ in the number of antennas to contend...
Provided by Association for Computing Machinery
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White Papers
Adaptable Security In Wireless Sensor Networks by Using Reconfigurable ECC Hardware Coprocessors
Oct 2010
Specific features of Wireless Sensor Networks (WSNs) like the open accessibility to nodes, or the easy observability of radio communications, lead to severe security challenges. The application of...
Provided by Universidad Politecnica de Madrid
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White Papers
Interference Planning for Multicell OFDM Downlink
Apr 2011
In this paper, the authors consider the downlink of an OFDM cellular system. The objective is to maximise the system utility by means of fractional frequency reuse and interference planning. The...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Mirage: Mitigating Illicit Inventorying in a RFID Enabled Retail Environment
Dec 2010
Given its low dollar and maintenance cost, RFID is poised to become the enabling technology for inventory control and supply chain management. However, as an outcome of its low cost, RFID based...
Provided by University of Arkansas
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White Papers
Processing Interference at the Physical Layer to Enhance Information Flow in Wireless Networks
Apr 2011
Interference in wireless networks results in interdependent communication links between the nodes. Therefore, cross-layer design is essential and makes optimization of wireless networks...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
A Distributed Scheduler for Airborne Backbone Networks With Directional Antennas
Dec 2010
Airborne backbone networks are useful in tactical applications to interconnect sub-networks. A major challenge in such networks, normally comprising large numbers of highly mobile nodes, is the...
Provided by Rochester Institute of Technology
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White Papers
Signed Graph Based Approach for On-line Optimization in Cognitive Networks
Apr 2011
One of the major architectural components shared between cognitive radios and networks is a cognitive engine supporting a cognition process. Many of the decision making in the process will involve...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Optimizing Power Consumption of Always-On Applications Based on Timer Alignment
Apr 2011
In modern smartphones there exist several applications that periodically establish data connection and/or send data to the network. For example, a mobile email application periodically checks for...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Downlink Transmission Mode Selection And Switching Algorithm for LTE
Apr 2011
Long Term Evolution (LTE) is an emerging 4G wireless access technology. Multiple-Input Multiple-Output (MIMO) systems are a primary enabler of the high data rate sought to be achieved by LTE....
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Clustering and OFDMA-Based MAC Protocol (COMAC) for Vehicular Ad Hoc Networks
Nov 2011
The IEEE community is working on the wireless access in vehicular environments as a main technology for vehicular ad hoc networks. The Medium Access Control (MAC) protocol of this system known as...
Provided by Springer
-
White Papers
The Impact of Spatial Correlation on the Statistical Properties of the Capacity of Nakagami-M Channels With MRC and EGC
Nov 2011
In this paper, the authors have studied the statistical properties of the instantaneous channel capacity of spatially correlated Nakagami-m channels for two different diversity combining methods,...
Provided by Springer
-
White Papers
Minimum-Length Scheduling With Rate Control in Wireless Networks: A Shortest Path Approach
Dec 2011
In this paper, the minimum-length scheduling problem in wireless networks is studied, where each source of traffic has a finite amount of data to deliver to its corresponding destination. The...
Provided by Springer
-
White Papers
Hidden Node Aware Routing Method Using Highsensitive Sensing Device for Multi-Hop Wireless Mesh Network
Oct 2011
Throughput maximization is one of the main challenges in multi-hop Wireless Mesh Network (WMN). Throughput of the multi-hop WMN network seriously degrades due to the presence of the hidden node....
Provided by Springer
-
White Papers
A New and Efficient Adaptive Scheduling Packets for the Uplink Traffic in WiMAX Networks
Nov 2011
In this paper, an adaptive scheduling packets algorithm for the uplink traffic in WiMAX networks is proposed. The proposed algorithm is designed to be completely dynamic, mainly in networks that...
Provided by Springer
-
White Papers
Minimum Decoding Trellis Length and Truncation Depth of Wrap-Around Viterbi Algorithm for TBCC in Mobile WiMAX
Nov 2011
The performance of the wrap-around Viterbi decoding algorithm with finite truncation depth and fixed decoding trellis length is investigated for tail-biting convolutional codes in the mobile WiMAX...
Provided by Springer
-
White Papers
Hadamard Upper Bound on Optimum Joint Decoding Capacity of Wyner Gaussian Cellular MAC
Nov 2011
This paper presents an original analytical expression for an upper bound on the optimum joint decoding capacity of Wyner Circular Gaussian Cellular Multiple Access Channel (C-GCMAC) for uniformly...
Provided by Springer
-
White Papers
A New Reduced-Complexity Detection Scheme for Zero-Padded OFDM Transmissions
Oct 2011
Recently, Zero-Padding Orthogonal Frequency Division Multiplexing (ZP-OFDM) has been proposed as an alternative solution to the traditional Cyclic Prefix (CP)-OFDM, to ensure symbol recovery...
Provided by Springer
-
White Papers
BOB-RED Queue Management for IEEE 802.15.4 Wireless Sensor Networks
Oct 2011
Multimedia services over resource constrained Wireless Sensor Networks (WSNs) face a performance bottleneck issue from the gateway node to the sink node. Therefore, the queue management at the...
Provided by Springer
-
White Papers
Dynamic Tuning of the IEEE 802.11 Distributed Coordination Function to Derive a Theoretical Throughput Limit
Oct 2011
IEEE 802.11 is the most popular and widely used standard for wireless local area network communication. It has attracted countless numbers of studies devoted to improving the performance of the...
Provided by Springer
-
White Papers
Optimized Combination Model and Algorithm of Parking Guidance Information Configuration
Oct 2011
Operators of Parking Guidance and Information (PGI) systems often have difficulty in providing the best car park availability information to drivers in periods of high demand. A new PGI...
Provided by Springer
-
White Papers
A Network Resource Availability Model for IEEE802.11a/b-Based WLAN Carrying Different Service Types
Oct 2011
Operators of integrated wireless systems need to have knowledge of the resource availability in their different access networks to perform efficient admission control and maintain good quality of...
Provided by Springer
-
White Papers
Hop-Distance Relationship Analysis With Quasi-UDG Model for Node Localization in Wireless Sensor Networks
Oct 2011
In Wireless Sensor Networks (WSNs), location information plays an important role in many fundamental services which includes geographic routing, target tracking, location-based coverage, topology...
Provided by Springer
-
White Papers
Cross-Layer Based Adaptive Wireless Traffic Control for Per-Flow and Per-Station Fairness
Sep 2011
In the IEEE 802.11 wireless LANs, the bandwidth is not fairly shared among stations due to the Distributed Coordination Function (DCF) mechanism in the IEEE 802.11 MAC protocol. It introduces the...
Provided by Springer
-
White Papers
Sleep/wake Scheduling Scheme for Minimizing End-to-End Delay in Multi-Hop Wireless Sensor Networks
Oct 2011
The authors present a sleep/wake schedule protocol for minimizing end-to-end delay for event driven multi-hop wireless sensor networks. In contrast to generic sleep/wake scheduling schemes, their...
Provided by Springer
-
White Papers
Novel Low-PAPR Parallel FSOK Transceiver Design for MC-CDMA System Over Multipath Fading Channels
Nov 2011
A low Peak-to-Average Power Ratio (PAPR) transceiver using a new parallel Frequency-Shift Orthogonal Keying (FSOK) technique is proposed for the multiuser uplink Multi-Carrier CDMA (MC-CDMA)...
Provided by Springer
-
White Papers
IDEA1: A Validated SystemC-Based System-Level Design and Simulation Environment for Wireless Sensor Networks
Feb 2012
This paper presents IDEA1, a SystemC-based system-level design and simulation framework for WSNs. It allows the performance evaluation (e.g., packet delivery rate, transmission latency and energy...
Provided by Springer
-
White Papers
Reconfigurable Antennas and Configuration Selection Methods for MIMO Ad Hoc Networks
Dec 2011
In this paper, the authors quantify the performance enhancements that can be provided by reconfigurable antennas in an ad hoc network where all nodes employ multiple input multiple output...
Provided by Springer
-
White Papers
Performance Analysis of MIMO-SESS With Alamouti Scheme Over Rayleigh Fading Channels
Dec 2011
Self-Encoded Spread Spectrum (SESS) is a novel modulation technique that acquires its spreading sequence from the random input data stream rather than through the use of the traditional...
Provided by Springer
-
White Papers
Call Admission Control With Heterogeneous Mobile Stations in Cellular/WLAN Interworking Systems
Oct 2011
Although different Call Admission Control (CAC) schemes have been proposed for cellular-wireless local area network (WLAN) inter-working systems, no studies consider Mobile Stations (MSs) only...
Provided by Springer
-
White Papers
Enhancing Role-Based Trust Management With a Reputation System for MANETs
Sep 2011
The authors start with Role-Based Trust Management (RBTM) and address some of the challenges associated with using RBTM in Mobile Ad hoc NETworks (MANETs). They, then enhance RBTM with Reputation...
Provided by Springer
-
White Papers
Performance Analysis for Optimum Transmission and Comparison With Maximal Ratio Transmission for MIMO Systems With Cochannel Interference
Sep 2011
This paper presents the performance analysis of Multiple-Input/Multiple-Output (MIMO) systems with Quadrature Amplitude Modulation (QAM) transmission in the presence of Co-Channel Interference...
Provided by Springer
-
White Papers
Implementation and Investigation of Circular Slot UWB Antenna With Dual-Band-Notched Characteristics
Oct 2011
The design and analysis of an ultra wideband aperture antenna with dual-band-notched characteristics are presented. The proposed antenna consists of a circular ring exciting stub on the front side...
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A Scalable Multi-Sink Gradient-Based Routing Protocol for Traffic Load Balancing
Oct 2011
Wireless sensor networks have been assumed to consist of a single sink and multiple sensor nodes which do not have mobility. In these networks, sensor nodes near the sink dissipate their energy so...
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Transmission Scheduling for Wireless Mesh Networks With Temporal Reuse
Sep 2011
Link-assigned transmission schedules with timeslot reuse by multiple links in both the space and time domains are investigated in this paper for stationary multihop wireless mesh networks with...
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On the Capacity of Rayleigh-Fading Correlated Spectrum Sharing Networks
Sep 2011
Recently, substantial attention has been paid to improve the spectral efficiency of communication setups using different spectrum sharing techniques. This paper aims to study the capacity of...
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Frequency Domain Equalization Space-Time Block-Coded CDMA Transmission System
Sep 2011
In this paper, the authors propose a Space-Time Block-Coded (STBF) CDMA transmission system suitable for use with Frequency Domain Equalization (FDE) algorithms. They illustrate the FDE by...
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The Village Telco Project: A Reliable and Practical Wireless Mesh Telephony Infrastructure
Sep 2011
VoIP (Voice over IP) over mesh networks could be a potential solution to the high cost of making phone calls in most parts of Africa. The Village Telco (VT) is an easy to use and scalable VoIP...
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Polarization Division Multiple Access With Polarization Modulation for LOS Wireless Communications
Sep 2011
In this paper, the authors discuss a potential multiple access and modulation scheme based on Polarized States (PS) of ElectroMagnetic (EM) waves for Line-Of-Sight (LOS) communications. The...
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White Papers
Low Complexity Lattice Reduction Scheme for STBC Two-User Uplink MIMO Systems
Oct 2011
Recently, a Lattice Reduction-Aided (LRA) multiple-input multiple-output detection scheme has been proposed in junction with linear (as well as nonlinear) detectors. It is well known that these...
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A Mobile and Portable Trusted Computing Platform
Sep 2011
The mechanism of establishing trust in a computing platform is tightly coupled with the characteristics of a specific machine. This limits the portability and mobility of trust as demanded by many...
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Location Based Spectrum Sensing Evaluation in Cognitive Radio Networks
Nov 2011
This paper addresses the problem of spectrum sensing over fading channel, in which a licensee and multiple unlicensed users coexist and operate in the licensed channel in a local area. The authors...
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Clustering-Based Routing for Top-K Querying in Wireless Sensor Networks
Oct 2011
A large-scale Wireless Sensor Networks (WSNs) can be deployed for top-k querying applications. There are many top-k querying algorithms which are based on traditional routing approaches. In this...
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Cooperative Localization in Wireless Ad Hoc and Sensor Networks Using Hybrid Distance and Bearing (angle of Arrival) Measurements
Sep 2011
This paper provides the graphical properties which can ensure unique localizability in cooperative networks with hybrid distance and bearing (angle of arrival) measurements. Furthermore, within...
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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...
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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...
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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...
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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...
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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...
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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...
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