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Institute of Electrical & Electronic Engineers
(11420 results)-
Whitepapers
Blind Turbo Channel Estimation of QAM Signals Exploiting Code Constraints
October 29, 2008, 12:00am PDT
The authors present a blind turbo equalizer for QAM signals that exploits the statistics that a channel code imposes on the transmitted signal. The receiver is an adaptation of previous work...
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Whitepapers
A Localized Self-Healing Algorithm for Networks of Moveable Sensor Nodes
October 29, 2008, 12:00am PDT
The effectiveness of Wireless Sensor Networks (WSNs) deployed in search and rescue, battlefield reconnaissance, surveillance, and other applications depends on inter-node interaction and...
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Whitepapers
Sensor Network Localization Via Nondifferentiable Optimization
October 29, 2008, 12:00am PDT
Knowing the positions of nodes is essential to many wireless sensor network applications. In contrast to range - based localization methods, range - free methods are more appealing since they do...
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Whitepapers
Adaptive Source Localization by a Mobile Robot Using Signal Power Gradient in Sensor Networks
October 29, 2008, 12:00am PDT
In this paper, the authors propose a novel approach of signal power gradient by which a robot adaptively searches a location-unknown sensor. While moving, the robot measures signal strength and...
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Whitepapers
Localization Error Evaluation in Heterogeneous Sensor Networks
October 29, 2008, 12:00am PDT
This paper proposes a hierarchical two-step localization method for heterogeneous sensor networks. The network consists of three types of nodes: anchor nodes with known locations, a few nodes...
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Whitepapers
A Novel Fading-Tolerant High-Accuracy Localization Algorithm Using Distributed Space-Time Block Codes
October 29, 2008, 12:00am PDT
In wireless sensor networks, localization in indoor environment suffers from non-LOS (Line-Of-Sight) and multi-path fading. In this paper, a new localization algorithm is proposed, which makes...
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Whitepapers
An Improved Communications Model for Underwater Sensor Networks
October 29, 2008, 12:00am PDT
Underwater sensor network deployment can be quite difficult and expensive, thus much of the early development is limited to simulation work. There are some underwater physical channel models...
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Whitepapers
Energy Optimized Path Unaware Layered Routing Protocol for Underwater Sensor Networks
October 29, 2008, 12:00am PDT
Finding an optimal routing path in adverse underwater environment in an UnderWater Sensor Network (UWSN) has always been a challenging task. By taking these issues into consideration the authors...
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Whitepapers
Assigning Sensors to Competing Missions
October 29, 2008, 12:00am PDT
When a sensor network is deployed in the field, it is typically required to support multiple simultaneous missions, which may start and finish at different times. Schemes that match sensor...
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Whitepapers
Mobile Solution for Three-Tier Biofeedback Data Acquisition and Processing
October 29, 2008, 12:00am PDT
Wireless sensor networks span from military applications into everyday life. Body sensor networks greatly benefit from wireless sensor networks to answer the biofeedback challenges in healthcare...
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Whitepapers
Mobile WiMAX Systems: Performance and Evolution
January 20, 2009, 12:00am PST
Mobile WiMAX was successfully adopted by ITU as one of the IMT-2000 technologies in November 2007. Since then mobile WiMAX (a.k.a., IP-OFDMA) has officially become a major global cellular wireless...
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Whitepapers
A Tutorial Survey on Vehicular Ad Hoc Networks
January 20, 2009, 12:00am PST
There has been significant interest and progress in the field of vehicular ad hoc networks over the last several years. VANETs comprise vehicle-to-vehicle and vehicle-to-infrastructure...
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Whitepapers
Spectrum Sensing in Cognitive Radio Networks: Requirements, Challenges and Design Trade-Offs
January 20, 2009, 12:00am PST
Opportunistic unlicensed access to the (temporarily) unused frequency bands across the licensed radio spectrum is currently being investigated as a means to increase the efficiency of spectrum...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Wireless Relays for Broadband Access
January 20, 2009, 12:00am PST
This paper presents the outlook of the overall broadband market and operators' challenges in offering profitable mass market mobile data services. The concept of wireless relaying and its state of...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
An Overview of MIMO-Oriented Channel Access in Wireless Networks
January 20, 2009, 12:00am PST
The integration of MIMO technology in WLANs has recently been the focus of extensive research. The main objectives of this technology are to improve channel reuse and/or reduce energy consumption....
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Whitepapers
End-to-End Differentiation of Congestion and Wireless Losses
January 1, 2012, 12:00am PST
In this paper, the authors explore end-to-end Loss Differentiation Algorithms (LDAs) for use with congestion-sensitive video transport protocols for networks with either backbone or last-hop...
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Whitepapers
Digital RoF Aided Cooperative Distributed Antennas with FFR in Multicell Multiuser Networks
July 27, 2011, 12:00am PDT
The classic Unity Frequency Reuse (UFR) pattern may be applied by wireless systems in order to maximize the attainable area spectral efficiency at the cost of increasing the co-channel...
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Whitepapers
Imperfect Digital Fibre Optic Link Based Cooperative Distributed Antennas With Fractional Frequency Reuse in Multicell Multiuser Networks
September 26, 2011, 12:00am PDT
The achievable throughput of the entire cellular area is investigated, when employing fractional frequency reuse techniques in conjunction with realistically modelled imperfect optical fibre aided...
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Whitepapers
Effects of Practical Impairments on Cooperative Distributed Antennas Combined With Fractional Frequency Reuse
March 12, 2012, 12:00am PDT
Cooperative Multiple Point (CoMP) transmission aided Distributed Antenna Systems (DAS) are proposed for increasing the received Signal-to-Interference-plus-Noise-Ratio (SINR) in the cell-edge area...
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Whitepapers
Co-Channel Interference Mitigation Capability of Fixed Relays Connected by Optical Fibre
July 27, 2010, 12:00am PDT
In this paper, the authors consider the co-channel interference mitigation capability of fixed relay aided wireless systems, where the relays are linked to the base station using realistic...
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Whitepapers
Random Access Compressed Sensing for Energy-Efficient Underwater Sensor Networks
September 1, 2011, 12:00am PDT
Inspired by the theory of compressed sensing and employing random channel access, the authors propose a distributed energy-efficient sensor network scheme denoted by Random Access Compressed...
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Whitepapers
A Load-Balanced Guiding Navigation Protocol in Wireless Sensor Networks
October 29, 2008, 12:00am PDT
One of the major applications of wireless sensor networks is guiding navigation service with its goal to assist moving objects in leaving a hazardous region safely and quickly. In this paper, the...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Designing an Application-Aware Routing Protocol for Wireless Sensor Networks
October 29, 2008, 12:00am PDT
Routing protocols that can facilitate application-specific service guarantee in Wireless Sensor Networks (WSN) constitute one of the key design objectives of current WSN research. Since,...
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Whitepapers
Oriented Void Avoidance Scheme for Real-Time Routing Protocols in Wireless Sensor Networks
October 29, 2008, 12:00am PDT
To avoid the negative impact of void areas on real-time routing efficiency, the authors propose in this paper an oriented void avoidance scheme for wireless sensor networks. To select the...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Routing in Three Dimensional Wireless Sensor Networks
October 29, 2008, 12:00am PDT
A sensor network is a promising technology that can be used to avoid disasters such as fire, storm, etc. This technology needs to be improved in terms of several issues. In this paper, the authors...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Fuzzy Algorithms for Maximum Lifetime Routing in Wireless Sensor Networks
October 29, 2008, 12:00am PDT
The authors address the maximum lifetime routing problem in Wireless Sensor Networks (WSNs) and propose two online routing algorithms based on fuzzy logic, namely fuzzy maximum lifetime algorithm...
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Whitepapers
Lifetime Analysis for Wireless Sensor Networks
October 29, 2008, 12:00am PDT
The nodes of Wireless Sensor Networks (WSNs) have the dual function of gathering information and relaying it to a central collection point, the sink. For the latter function the key is...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
A Wireless Array Based Cooperative Sensing Model in Sensor Networks
October 29, 2008, 12:00am PDT
In Wireless Sensor Network (WSN), the performance and effectiveness of the network is highly dependant on its geographical coverage. However, in many applications the actual coverage cannot be...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Optimizing Video Transmission over Wireless Multimedia Sensor Networks
October 29, 2008, 12:00am PDT
This paper proposes an efficient packet scheduling scheme for minimizing perceived video distortion and power consumption over multipath wireless multimedia sensor networks. The proposed...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
An Energy Efficient Hybrid Medium Access Control Scheme for Wireless Sensor Networks With Quality of Service Guarantees
October 29, 2008, 12:00am PDT
In this paper, the authors present a new MAC layer protocol for wireless sensor networks that reduces energy consumption and provides Quality of Service (QoS) guarantees through the use of service...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
A New Security Scheme for Wireless Sensor Networks
October 29, 2008, 12:00am PDT
Wireless Sensor Networks (WSN) is ad-hoc mobile networks in which the sensors have limited resources and communication capabilities. Secure communications in some wireless sensor networks are...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Weaving a Proper Net to Catch Large Objects
October 29, 2008, 12:00am PDT
Wireless sensor networks are usually over-engineered, i.e., more than required sensors are deployed and remain active in order to cover each point in the monitored field with a high probability at...
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Whitepapers
A Combinatorial Approach for Key-Distribution in Wireless Sensor Networks
October 29, 2008, 12:00am PDT
Sensor nodes are usually deployed in adversarial environments in which they are subject to compromise and revelation of critical information rendering the entire network useless. Therefore, secure...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Epidemic Propagation in Overlaid Wireless Networks
October 29, 2008, 12:00am PDT
With the emergence of computer worms that can spread over air interfaces, wireless ad hoc and sensor networks can be vulnerable to node compromises even if the deployed network is not connected to...
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Whitepapers
Pairing-Based Secure Timing Synchronization for Heterogeneous Sensor Networks
October 29, 2008, 12:00am PDT
Secure time synchronization is one of the key concerns for some sophisticated sensor network applications. Most existing time synchronization protocols are affected by almost all attacks. In this...
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Whitepapers
Bilateral Shapley Value Based Cooperative Gateway Selection in Congested Wireless Mesh Networks
October 29, 2008, 12:00am PDT
In Wireless Mesh Networks (WMNs), the achievable throughput of a mesh client to a GateWay (GW) is limited by the minimum link capacity of the intermediate nodes. In instances when the intermediate...
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Whitepapers
Channel Modeling of Wireless Networks in Tunnels
October 29, 2008, 12:00am PDT
The propagation characteristics of ElectroMagnetic (EM) waves in tunnels are significantly different from those in terrestrial environment. However, the current tunnel channel models cannot...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
On Proportional Fair Scheduling in Multi-Antenna Wireless Mesh Networks-Theoretical Analysis
October 29, 2008, 12:00am PDT
Proportional Fair Scheduling (PFS) provides good balance between throughput and fairness via multi-user diversity and game-theoretic equilibrium. Very little analytical work exists on...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Distortion Analysis for Real-Time Reconstruction of Correlated Data Field in Heterogeneous Sensor Networks
October 29, 2008, 12:00am PDT
This paper deals with the analysis of distortion introduced in the real time reconstruction of a spatio-temporally correlated field by a sink node. The field is measured by a randomly deployed...
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Whitepapers
Optimal Target Detection With Localized Fusion in Wireless Sensor Networks
October 29, 2008, 12:00am PDT
Detecting the presence/absence of an object in a region of interest is one of the important applications for sensor networks. A considerable amount of work has been seen in the literature for...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Carrier Ethernet for Transport in UMTS Radio Access Network: Ethernet Backhaul Evolution
April 15, 2008, 12:00am PDT
This paper discusses the use of Carrier Ethernet for the transport of UMTS radio access network as a alternative solution for the gradual migration towards pure IP-based RAN. By means of...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Multicast Vs Multiple Unicast Scheduling in High-Speed Cellular Networks
April 15, 2008, 12:00am PDT
Packet scheduling is one of the key features in data oriented radio interfaces of cellular networks like HSDPA (High Speed Downlink Packet Access). It has been primarily designed for unicast...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Theoretical FER Performance of Multi-Hop Wireless Cooperative Networks Using Transmit Diversity
April 15, 2008, 12:00am PDT
Multi-hop relaying can extend communication range using limited transmit power, and improve area spectral efficiency. However, they might cause considerable degradation of end-to-end error...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
On the Use of Uplink Received Signal Strength Measurements for Handover
April 15, 2008, 12:00am PDT
In most cellular systems, handover decisions are based on measurements of the downlink signal strength. When the average path gain in downlink and uplink is similar, such principles yield good...
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Whitepapers
Least Squares Channel Estimation for IEEE 802.16e Systems Based on Adaptive Taps Selection
April 15, 2008, 12:00am PDT
IEEE 802.16 is an emerging technology for broadband cellular wireless communications. In the context of high capacity systems for mobile terminals, implementation issues like channel estimation...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
New Frequency-Time Scheduling Algorithms for 3GPP/LTE-like OFDMA Air Interface in the Downlin
April 15, 2008, 12:00am PDT
This paper proposes new frequency-time schedulers for 3GPP/LTE-like system in the downlink. 3GPP/LTE DL is OFDMA-based with Adaptive Modulation and Coding (AMC) and frequency-time scheduling to...
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Whitepapers
Analytical Evaluation of Dynamic Proxy Assisted Mobility Support in P2P Networks
April 15, 2008, 12:00am PDT
In recent years peer-to-peer communications has developed into a powerful networking model for real-time applications. Its slow adoption by the wireless community can be attributed to several...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Downlink B3G MIMO OFDMA Link and System Level Performance
April 15, 2008, 12:00am PDT
This paper provides a link and system level study of the downlink in a B3G system using MIMO OFDMA techniques. A 3GPP/LTE-like scenario, in terms of frame structure and system main parameters, is...
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Whitepapers
Selective Cooperative Relaying in OFDMA-TDD System for Broadband Mobile Wireless Services
April 15, 2008, 12:00am PDT
Depending on the position of mobile stations in the multihop relay system, various types of cooperative relaying schemes show the different level of throughput and outage performance, due to their...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
In-Band Interference Effects on UTRA LTE Uplink Resource Block Allocation
April 15, 2008, 12:00am PDT
In this paper, the authors investigate the impact of in-band interference on the uplink multiple access of UMTS Terrestrial Radio Access, Long Term Evolution (UTRA LTE). In-band and out-of-band...
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Whitepapers
Analysis of Interference Effects between Co-Existent 802.11b and 802.11g Wi-Fi Systems
April 15, 2008, 12:00am PDT
The main aim of this paper is to provide insights into the performance degradation caused by interference between coexistent 802.11b and 802.11g WiFi systems operating in environments where...
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Whitepapers
Integrated GSM/WiFi Backhauling over Satellite: Flexible Solution for Emergency Communications
April 15, 2008, 12:00am PDT
This paper presents the development of a compact, ruggedized satellite terminal, to be used for communications in emergency situation. The terminal provides GSM coverage in disaster area, where...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Dynamic Priority Queue Handover Scheme for Multiservice
April 15, 2008, 12:00am PDT
Mobile service will be more various and handover have to adapt different Quality-of-Service (QoS) requirements of all kinds of service in 4G mobile communication systems. In the paper, a dynamic...
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Whitepapers
Analytical Estimation of Packet Delays in Relay-Based IMT-Advanced Networks
April 15, 2008, 12:00am PDT
The paper shows that relays as inherent technology of IMT-Advanced system can provide low delays as required for future multi-media services. The results shown prove that the proposed relaying...
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Whitepapers
The Architecture of Cross-Campus WLAN Roaming Environment in Taiwan
April 15, 2008, 12:00am PDT
There are totally 163 colleges and universities in Taiwan, 90% of them have established their campus WLAN environment and 61% of them have joined the cross-campus WLAN roaming environment under...
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Whitepapers
Uplink VoIP Performance in E-UTRAN TDD Mode
April 15, 2008, 12:00am PDT
The Long Term Evolution (LTE) of 3GPP radio-access technology aims to develop a framework towards a high-data-rate, low-latency and packet-optimized radio access technology: Evolved Universal...
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Whitepapers
VoIP performance in "MeshBed" - A Wireless Mesh Networks Testbed
April 15, 2008, 12:00am PDT
This paper presents a WLAN based next generation wireless mesh testbed, called "MeshBed". The aim of this testbed is to investigate carrier-grade mesh network aspects from network operator's point...
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Whitepapers
Load Matrix Optimization in Mobile Cellular Networks
April 15, 2008, 12:00am PDT
Future mobile networks providing multitude of services with large range of QoS requirements has made the importance of Radio Resource Management (RRM) ever more significant. Traditional scheduling...
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Whitepapers
Theoretical Capacity and Outage Rate of OFDMA Cellular System with Fractional Frequency Reuse
April 15, 2008, 12:00am PDT
Employing Fractional Frequency Reuse (FFR) in OFDMA cellular systems is attracting a lot of attention since it offers large capacity and one-cell frequency reuse. However its performance under...
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Whitepapers
A Wireless Mesh Network-Based Platform for ITS
April 15, 2008, 12:00am PDT
Although efficient and safe transportation of people and goods is paramount transportation problems continue to soar. Traffic congestions are of the most visible of transportation problems in...
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Whitepapers
Resource Allocation Techniques for OFDMA-Based Decode-and-Forward Relaying Networks
April 15, 2008, 12:00am PDT
In this paper, the authors focus on the design of efficient resource allocation algorithms for a multihop cellular network, with Orthogonal Frequency Division Multiple Accesses (OFDMA) as downlink...
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Whitepapers
Extending Enterprise Architecture with Mobility
April 15, 2008, 12:00am PDT
This paper discusses the extension of the Enterprise Architecture (EA) with mobile technologies. The mobile technologies provide the modern business with benefits of location and time independence...
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Whitepapers
Dynamic Access Network Selection with QoS Parameters Estimation: A Step Closer to ABC
April 15, 2008, 12:00am PDT
Always Best Connected (ABC) services allow multimode mobile terminals to stay connected to the best available networks, at anytime according to user preferences. One of the key aspects in...
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Whitepapers
Boosting Video Capacity of IEEE 802.11n Through Multiple Receiver Frame Aggregation
April 15, 2008, 12:00am PDT
The technology based on the IEEE 802.11 standard has been hugely successful, and is evolving towards even higher speeds and richer features. In particular, the 802.11n amendment of the standard...
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A Novel Approach for Realistic Emulation of Vehicle-2-X Communication Applications
April 15, 2008, 12:00am PDT
New applications in future intelligent transportation systems are to enhance both safety and traffic efficiency. Wireless vehicular communication is to provide the basis for the new Vehicle-2-X...
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Whitepapers
QoS Oriented Time and Frequency Domain Packet Schedulers for The UTRAN Long Term Evolution
April 15, 2008, 12:00am PDT
In this paper, the authors introduce Orthogonal Frequency Division Multiple Access (OFDMA) downlink general packet scheduling methods for throughput fairness control among users. The investigation...
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Distributed Detection in OFDM Based Ad Hoc Overlay Systems
April 15, 2008, 12:00am PDT
Overlay systems are a feasible approach to increase the efficiency of spectrum use. An independent Secondary User (SU) system operates in the same frequency band as a Primary User (PU) system. In...
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Whitepapers
Performance Evaluation of a Relay-Based 4G Network Deployment with Combined SDMA/OFDMA and Resource Partitioning
April 15, 2008, 12:00am PDT
This paper presents a low-cost, low complexity deployment concept for a relay-based cellular broadband network. The concept is based on a combination of a multi-antenna OFDMA Base Station (BS) and...
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Whitepapers
On the Benefits of Relays in a Metropolitan Area Network
April 15, 2008, 12:00am PDT
The main motivation to deploy fixed wireless relays in a wireless communication system is to save costs while achieving a similar or better service level and coverage than with a base station only...
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Analytic Evaluation of a Hybrid Broadcast-Unicast TV Offering
April 15, 2008, 12:00am PDT
Today mobile TV services in cellular spectrum are delivered over unicast radio bearers as offered by 3G technologies like WCDMA and HSDPA. Since unicast transmission does not scale very well if...
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Whitepapers
Performance of Uplink Fractional Power Control in UTRAN LTE
April 15, 2008, 12:00am PDT
UTRAN Long Term Evolution is currently being standardized in 3GPP with the aim of more than twice the capacity over High-Speed Packet Access. The chosen multiple access for uplink is Single...
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Whitepapers
Low Power Consumption Solutions for Instant Messaging on Mobile Devices
April 15, 2008, 12:00am PDT
Instant Messaging (IM) services enable real-time text and multimedia exchange and online presence awareness. Users typically log onto IM services persistently in order to discover available...
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Whitepapers
Improving SC-FDMA Performance by Turbo Equalization in UTRA LTE Uplink
April 15, 2008, 12:00am PDT
Turbo equalization is known as an advanced iterative equalization and decoding technique that allows to enhance the performance of the data transmission over a frequency selective fading channel....
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Whitepapers
Web Optimization in Real UMTS Networks with Channel Switching Mechanisms
April 15, 2008, 12:00am PDT
Web download performance is dramatically degraded in UMTS, resulting in perceived throughputs of around 25% of the expected bandwidth even in favorable conditions. The authors analyze the main...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Performance of WiMAX Networks Integrated in a Segment of Satellite Using Channel Reservation Mechanism
April 15, 2008, 12:00am PDT
Mobility issue and service continuity represent important challenges for next generation networks. The integration of a satellite segment within a terrestrial network (especially WiMAX) has...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Spectral Correlation-Based Multi-Antenna Spectrum Sensing Technique
March 11, 2008, 12:00am PDT
To meet the challenges in sensing the spectrum in a reliable and timely manner, an approach of multi-antenna spectrum sensing based on spectral correlation property is proposed in this paper....
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Whitepapers
Energy-Efficient Joint Power and Rate Control via Pricing in Wireless Data Networks
March 11, 2008, 12:00am PDT
Next Generation wireless networks are evolving towards all-data system which are expected to support a variety of application services with diverse transmission rates. Meanwhile, since most of the...
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Whitepapers
Optimal Voice Admission Control Performance under Soft Vertical Handoff in Loosely Coupled 3G/WLAN Networks
March 11, 2008, 12:00am PDT
Low cost WLAN networks are very likely to be loosely coupled to high cost 3G networks in order to provide the 3G subscribers with an extended WLAN capacity and the WLAN subscribers with the 3G...
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An Introduction to the Cognitive Concept as a Cost-Effective Method for Network Performance Management
March 11, 2008, 12:00am PDT
A successful journey beyond 3G towards 4G Mobile is ensured to a large extent by creating cost-effective solutions for ubiquitous converged voice and data networks. This could be achieved through...
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Whitepapers
Subchannel-Division Adaptive Resource Allocation Technique for Cooperative Relay-Based MIMO/OFDM Wireless Communication Systems
March 11, 2008, 12:00am PDT
In this paper, the authors propose cooperative division relay based allocation technique jointly with adaptive bit/power loading for Multiple-Input-Multiple-Output/Orthogonal Frequency Division...
Provided by Institute of Electrical & Electronic Engineers
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