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mobile - wireless communications
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Whitepapers
Temperature-Adaptive Back-Bias Voltage Generator for an RCAT Pseudo SRAM
Jun 2010
In order to guarantee the proper operation of a Recessed Channel Array Transistor (RCAT) pseudo SRAM, the back-bias voltage must be changed in response to changes in temperature. Due to cell...
Provided by Electronics and Telecommunication Research Institute
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Whitepapers
Multiband Meandered Monopole Antenna for Mobile Applications
Jun 2010
A multiband meandered monopole antenna is proposed for Digital Video Broadcasting Handheld (DVB-H), global positioning system, personal communications service, Wireless broadband (Wibro), and...
Provided by Electronics and Telecommunication Research Institute
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Whitepapers
Efficient Implementation of a Pseudorandom Sequence Generator for High-Speed Data Communications
Apr 2010
A conventional pseudorandom sequence generator creates only 1 bit of data per clock cycle. Therefore, it may cause a delay in data communications. In this paper, the authors propose an efficient...
Provided by Electronics and Telecommunication Research Institute
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Whitepapers
Relay Performance Analysis of TTR and STR Relay Modes in IEEE 802.16j MMR System
Apr 2010
The IEEE802.16j standard uses non-transparent relay stations to extend coverage. There are two types of nontransparent relay modes, that is, the Time-division Transmit and Receive (TTR) relay mode...
Provided by Electronics and Telecommunication Research Institute
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Whitepapers
Scalable Video Streaming With Utilization of Multiple Radio Interfaces: A Customized Method for Signaling and Bandwidth Estimation
Nov 2011
Scalable video coding allows to stream the multimedia content in hierarchically structured flows selected by the client due to his quality needs. In this paper, the authors aim to improve the...
Provided by Technische Universität Berlin
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Whitepapers
Relay-Assisted Decorrelating Multiuser Detector (RAD-MUD) for Cooperative CDMA Networks
Apr 2008
In this paper, the authors examine the uplink of a cooperative CDMA network, where users cooperate by relaying each other's messages to the base station. When spreading waveforms are not...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Optimized Opportunistic Multicast Scheduling Over Cellular Networks
Jul 2008
The design of optimal Opportunistic Multicast Scheduling (OMS) that maximizes the throughput of cellular networks is investigated. In a cellular network, the Base Station (BS) transmits the same...
Provided by University of Southern California
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Whitepapers
A Graph-Based Approach to Multi-Cell OFDMA Downlink Resource Allocation
Aug 2008
A novel, practical and low-complexity multi-cell OFDMA downlink channel assignment method using a graph-based approach is proposed in this paper. The Inter-Cell Interference (ICI) information is...
Provided by University of Southern California
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Whitepapers
Opportunistic Access With Random Subchannel Backoff (OARSB) for OFDMA Uplink
Jul 2007
A distributed Medium Access Control (MAC) algorithm for uplink OFDMA networks under the IEEE 802.16 framework is proposed and analyzed in this paper. The authors present a simple yet efficient...
Provided by University of Southern California
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Whitepapers
V-BLAST Receiver for MIMO Relay Networks With Imperfect CSI
Dec 2007
Previous work described that the improvements in spectral efficiency and link reliability can be obtained in wireless relay networks employing terminals with MIMO capability. The authors propose...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Computationally Efficient Dynamic Code Assignment Schemes With Call Admission Control (DCA-CAC) for OVSF-CDMA Systems
Jan 2008
This paper investigates computationally efficient suboptimal Dynamic Code Assignment (DCA) schemes with Call Admission Control (CAC) for orthogonal variable spreading factor code-division...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Power-Aware Topology Control for Wireless Ad-Hoc Networks
Jan 2012
In this paper, the authors examine the problem of power-aware topology control for wireless ad-hoc networks. The reliance on wireless multihop communications to maintain connectivity among nodes...
Provided by University of Southern California
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Whitepapers
V-BLAST Receiver and Performance in MIMO Relay Networks With Impact CSI
May 2008
Previous work described that the improvements in spectral efficiency and link reliability can be obtained in wireless relay networks employing terminals with MIMO capability. In order to take the...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Complexity Reduction of Maximum-Likelihood Multiuser Detection (ML-MUD) Receivers With Carrier Interferometry Codes in MC-CDMA
May 2008
Multi-Carrier Code Division Multiple Access (MCCDMA), has emerged as a promising multi-access technique for high data rate communications. MC-CDMA is more robust to Inter Symbol Interference (ISI)...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Advanced Colluder Detection for a Family of Anti-Collusion Hiding Codes
Jun 2008
In this paper, the authors examine a family of anti-collusion codes using the principle of "Orthogonal Spreading followed by the Inverse Fourier Transform (OSIFT)" as introduced. The...
Provided by University of Southern California
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Whitepapers
Low-Complexity Mobile Video Error Concealment With OBMA
Sep 2007
A low-complexity error concealment technique called the Outer Boundary Matching Algorithm (OBMA) for mobile video applications is studied extensively in this paper. The OBMA technique is shown to...
Provided by University of Southern California
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Whitepapers
Mobile Video Processing for Visual Saliency Map Determination
Aug 2008
The visual saliency map represents the most attractive regions in video. Automatic saliency map determination is important in mobile video applications such as auto-focusing in video capturing. It...
Provided by University of Southern California
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Whitepapers
Reliable Hybrid Service Discovery Protocol in Mobile Ad-Hoc Grid
Jun 2010
Mobile ad-hoc Grid is one of the modern distributed systems that have been introduced until now. It combines traditional grid capabilities with ad-hoc network flexibilities. Service discovery is...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Traffic Reduction in Hybrid Service Discovery Protocol in Mobile Ad-Hoc Grid
Nov 2009
Service discovery is an important part of nodes communication and collaboration infrastructure in grid computing and the first stage of grid computing scheduling stages. Thus service discovery is...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
A Classification Framework for Scheduling Algorithms in Wireless Mesh Networks
Mar 2012
Scheduling MAC-layer transmissions in multi-hop wireless networks is an active and stimulating area of research. There are several interesting algorithms proposed in the literature in the problem...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
On Managing Quality of Experience of Multiple Video Streams in Wireless Networks
Jul 2011
Managing the Quality-of-Experience (QoE) of video streaming for wireless clients is becoming increasingly important due to the rapid growth of video traffic on wireless networks. The inherent...
Provided by University of Massachusetts
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Whitepapers
Improving Convergence Speed and Scalability in OSPF: A Survey
Jan 2011
Open Shortest Path First (OSPF), a link state routing protocol, is a popular Interior Gateway Protocol (IGP) in the Internet. Wide spread deployment and years of experience running the protocol...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
A Simulation Based Analysis of the Impact of IEEE 802.15.4 MAC Parameters on the Performance Under Different Traffic Loads
Apr 2009
IEEE 802.15.4, a MAC/PHY protocol for low power and low data rate wireless networks, is emerging as the popular choice for various monitoring and control applications. Depending on the...
Provided by IOS Press
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Whitepapers
Traffic-Aware Multiple Mix Zone Placement for Protecting Location Privacy
Dec 2011
Privacy protection is of critical concern to Location-Based Service (LBS) users in mobile networks. Long-term pseudonyms, although appear to be anonymous, in fact empower third-party service...
Provided by University of Florida
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Whitepapers
Trailing Mobile Sinks: A Proactive Data Reporting Protocol for Wireless Sensor Networks
Mar 2011
In Wireless Sensor Networks (WSN), data gathering using mobile sinks typically incurs constant propagation of sink location indication messages to guide the direction of data reporting. Such...
Provided by University of Florida
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Whitepapers
Enhancing Simulation Mode Operation of Ospfd
Dec 2009
In this paper, the authors describe their modifications to ospfd, a popular open-source implementation of OSPF routing protocol. The ospfd software can also be run in simulation mode, where...
Provided by University of Wisconsin
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Whitepapers
Analyzing the Hold Time Schemes to Limit the Routing Table Calculations in OSPF Protocol
Jun 2009
OSPF is a popular interior gateway routing protocol. Commercial OSPF routers limit their processing load by using a hold time between successive routing table calculations as new Link State...
Provided by University of Wisconsin
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Whitepapers
Scheduling Routing Table Calculations to Achieve Fast Convergence in OSPF Protocol
Jun 2008
Fast convergence to topology changes is now a key requirement in routing infrastructures while reducing the routing protocol's processing overhead continues to be as important as before. In this...
Provided by University of Wisconsin
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Whitepapers
Covert Channels and Countermeasures in Computer Network Protocols
Dec 2007
Covert channels are used for the secret transfer of information. Encryption only protects communication from being decoded by unauthorized parties, whereas covert channels aim to hide the very...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
A Survey of Covert Channels and Countermeasures in Computer Network Protocols
Apr 2008
Covert channels are used for the secret transfer of information. Encryption only protects communication from being decoded by unauthorised parties, whereas covert channels aim to hide the very...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Covert Channels in Multiplayer First Person Shooter Online Games
Sep 2008
Covert channels aim to hide the existence of communication between two or more parties. Such channels typically utilize pre-existing (overt) data transmissions to carry hidden messages....
Provided by Swinburne University of Technology
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Whitepapers
An Improved Clock-Skew Measurement Technique for Revealing Hidden Services
Jun 2008
The Tor anonymisation network allows services, such as web servers, to be operated under a pseudonym. In previous work Murdoch described a novel attack to reveal such hidden services by...
Provided by Swinburne University of Technology
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Whitepapers
An Empirical Evaluation of IP Time to Live Covert Channels
Oct 2007
Communication is not necessarily made secure by the use of encryption alone. The mere existence of communication is often enough to raise suspicion and trigger investigative actions. Covert...
Provided by Swinburne University of Technology
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Whitepapers
Error Probability Analysis of IP Time to Live Covert Channels
Sep 2007
Communication is not necessarily made secure by the use of encryption alone. The mere existence of communication is often enough to raise suspicion and trigger investigative actions. Covert...
Provided by Swinburne University of Technology
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Whitepapers
Estimating the Capacity of Temperature-Based Covert Channels
Dec 2009
Covert channels aim to hide the existence of communication between two or more parties. Such channels typically utilize pre-existing overt data transmissions to carry hidden messages. Recently,...
Provided by Swinburne University of Technology
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Whitepapers
CCHEF - Covert Channels Evaluation Framework Design and Implementation
May 2008
Communication is not necessarily made secure by the use of encryption alone. The mere existence of communication is often enough to raise suspicion and trigger investigative actions. Covert...
Provided by Swinburne University of Technology
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Whitepapers
Real Time Traffic Classification and Prioritisation on a Home Router Using DIFFUSE
Mar 2012
Quality of Service (QoS) is important in multi-user residential networks that share a common bandwidth-constrained Internet connection. A limited upstream bandwidth can become a bottleneck and the...
Provided by Swinburne University of Technology
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Whitepapers
A Simple Free-Flow Traffic Model for Vehicular Intermittently Connected Networks
Apr 2012
The performance of Vehicular Data Networks (VDNs) is highly dependent on vehicular traffic. Existing studies on VDNs consider custom-developed traffic models that mimic real-life vehicular traffic...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Disruption-Tolerant Networking: A Comprehensive Survey on Recent Developments and Persisting Challenges
May 2011
Nowadays, wireless networks are witnessing several deployments in various extreme environments where they suffer from different levels of link disruptions depending on the severity of the...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Probabilistic Bundle Relaying Schemes in Two-Hop Vehicular Delay Tolerant Networks
Mar 2011
One class of Vehicular Delay-Tolerant Networks consists of two node types: stationary and mobile. Stationary nodes deployed along roadsides cannot directly communicate as they are considerably...
Provided by Institute of Electrical & Electronic Engineers
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White Papers
Moving Away From Collision Avoidance: Towards Collision Detection in Wireless Networks
Oct 2009
Wireless networks are founded on the principles of collision avoidance. This paper makes an attempt to detect and abort collisions in wireless networks. Briefly, the receiver uses physical layer...
Provided by University of South Carolina
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White Papers
AccuRate: Constellation Based Rate Estimation in Wireless Networks
Mar 2010
This paper proposes to exploit physical layer information towards improved rate selection in wireless networks. While existing schemes pick good transmission rates, this paper takes a step further...
Provided by University of South Carolina
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White Papers
Efficient Monitoring in Wireless Mesh Networks: Overheads and Accuracy Trade-Offs
Apr 2008
802.11-based multi-hop wireless mesh networks have become increasingly prevalent over the last few years. Recently, a lot of focus has been on deploying monitoring frameworks for enterprise and...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
MobiCom 2009 Poster: Movement Strategies for Intelligent Mobile Routers
Aug 2010
If the authors give routers the ability to move, they no longer have to sit idly in a non-optimal position. They can make their own decisions to attempt to improve the efficacy of themselves or...
Provided by University of South Carolina
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White Papers
Mobility Control With Local Views of Neighborhood in Mobile Networks
Jan 2011
Recent work in mobile ad hoc networks, simply MANETs, has drawn attention to the mobility capability of each node. It is proved that the optimal positions of the relay nodes along a single active...
Provided by Florida Atlantic University
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White Papers
Determining 802.11 Link Quality With Passive Measurements
Jul 2008
Unlike a wired link, a wireless link changes according to the physical environment and the network traffic in the surrounding area. The link quality, capacity and reliability are dependent on the...
Provided by University of California, Davis
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White Papers
Quorum Based IP Address Autoconfiguration in Mobile Ad Hoc Networks
Jun 2007
IP address autoconfiguration poses a challenge for Mobile Ad hoc NETworks (MANETs) since it has to be done to ensure correct routing. Protocols for IP address autoconfiguration can be classified...
Provided by Florida Atlantic University
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White Papers
Efficient Backbone Construction Methods in MANETs Using Directional Antennas
Apr 2007
This paper considers the issue of constructing an energy-efficient virtual network backbone in Mobile Ad hoc NETworks (MANETs) for broadcasting applications using directional antennas. In...
Provided by Florida Atlantic University
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White Papers
Uncertainty Mitigation for Utility-Oriented Routing in Wireless Ad Hoc Networks
Jul 2007
Link and node reliability are important metrics in wireless ad hoc networks. Therefore, evaluating and quantifying reliability has become the cornerstone of research in this field. Many existing...
Provided by Florida Atlantic University
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White Papers
Destination-Region-Based Local Minimum Aware Geometric Routing
Oct 2007
Geometric routing algorithms in Mobile Ad hoc NETworks (MANETs) contain two forwarding modes: greedy forwarding and face forwarding. It is well known that face forwarding is inefficient and fails...
Provided by Florida Atlantic University
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White Papers
Authentication Via Ambassadors: A Novel Authentication Mechanism in MANETs
Jun 2007
The reputation bootstrap problem is a significant issue for Mobile Ad-hoc NETworks (MANETs). This paper presents a novel mechanism, Authentication via Ambassadors, which authenticates mobile nodes...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Localized Access Point Selection in Infrastructure Wireless LAN
Jun 2007
The poor performance of the current Access Point (AP) selection schemes in infrastructure WLANs motivated intensive studies to balance loads among APs. This paper models the AP selection problem...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Algorithms for Fault-Tolerant Topology in Heterogeneous Wireless Sensor Networks
Apr 2008
This paper addresses fault-tolerant topology control in a heterogeneous wireless sensor network consisting of several resource-rich supernodes, used for data relaying, and a large number of...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Iterative Local Solutions for Connected Dominating Sets in Ad Hoc Wireless Networks
May 2008
This paper proposes a general framework of the Iterative Local Solution (ILS) for computing a Connected Dominating Set (CDS) in ad hoc wireless networks, which include Mobile Ad hoc NETworks...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Efficient Directional Network Backbone Construction in Mobile Ad Hoc Networks
Dec 2008
This paper considers the issue of constructing an energy-efficient virtual network backbone in Mobile Ad hoc NETworks (MANETs) for broadcasting applications using directional antennas. In...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
A Security-Aware Routing Protocol for Wireless Ad Hoc Networks
Jan 2011
This paper proposes a new routing technique called Security-Aware ad hoc Routing (SAR) that incorporates security attributes as parameters into ad hoc route discovery. SAR enables the use of...
Provided by University of Illinois at Urbana-Champaign
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White Papers
802.11g Long-Distance Measurements: Antenna Placement and Orientation
Aug 2007
With the increasing popularity of 802.11 wireless technologies, such equipment has recently been used to set up long distance links for wireless mesh networks. To be able to increase the range of...
Provided by University of Massachusetts
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White Papers
Network Coding Performance for Reliable Multicast
Aug 2007
The capacity gain of network coding has been extensively studied in wired and wireless networks. Recently, it has been shown that network coding improves network reliability by reducing the number...
Provided by University of Massachusetts
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White Papers
Data Gathering Capacity of Large Scale Multihop Wireless Networks
Apr 2008
This paper studies the scaling laws of the data gathering capacity of large scale multihop wireless networks. Unlike the data communication paradigms studied in previous research, for example, the...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Bounds on the Throughput Gain of Network Coding in Unicast and Multicast Wireless Networks
Jun 2009
Multi-hop wireless networks have been intensively studied in recent years for both commercial and government applications. Such networks, static or mobile, have the potential to serve as either a...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Secure Wireless Communication With Dynamic Secrets
Jan 2010
This paper introduces a set of low-complexity algorithms that when coupled with link layer retransmission mechanisms, strengthen wireless communication security. The basic idea is to generate a...
Provided by University of Massachusetts
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White Papers
Multi-User Diversity for Secrecy in Wireless Networks
May 2010
The ability to transmit a message securely in the presence of eavesdroppers in a dense wireless network is considered. As with a number of recent schemes, system nodes other than the transmitter...
Provided by University of Massachusetts
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White Papers
Efficient Algorithms for Neighbor Discovery in Wireless Networks
Dec 2010
Wireless ad hoc networks and sensor networks are typically deployed without any communication infrastructure and are required to "Configure" themselves upon deployment. For instance, immediately...
Provided by University of Massachusetts
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White Papers
A Relay Assisted Cooperative Transmission Protocol for Wireless Multiple Access Systems
Jan 2010
This paper proposes a spectrally efficient cooperative transmission protocol for multiple access scenarios. The key feature is to utilize multi-user diversity and fully exploit the dynamic nature...
Provided by University of Massachusetts
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White Papers
Physical-Layer-Enhanced Wireless Secret Key Exchange
May 2010
This paper addresses the problem of efficiently establishing a shared secret key over an open wireless channel in the presence of an active (Jamming) adversary. A commonly employed technique in...
Provided by University of Massachusetts
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White Papers
Logarithmic Store-Carry-Forward Routing in Mobile Ad Hoc Networks
Jun 2007
Two schools of thought exist in terms of handling mobility in Mobile Ad hoc NETworks (MANETs). One is the traditional connection-based model, which views node mobility as undesirable and tries to...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Scan-Based Movement-Assisted Sensor Deployment Methods in Wireless Sensor Networks
Jul 2007
The efficiency of sensor networks depends on the coverage of the monitoring area. Although, in general, a sufficient number of sensors are used to ensure a certain degree of redundancy in...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Relays, Base Stations, and Meshes: Enhancing Mobile Networks With Infrastructure
Sep 2008
Networks composed of mobile nodes inherently suffer from intermittent connections and high delays. Performance can be improved by adding supporting infrastructure, including base stations, meshes,...
Provided by Association for Computing Machinery
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White Papers
Enhancing Interactive Web Applications in Hybrid Networks
Sep 2008
The value of mobile, networked systems is derived from a balance of the breadth of applications that can be supported and the costs to the user. Commercial cellular data services such as 3G...
Provided by Association for Computing Machinery
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White Papers
DOME: A Diverse Outdoor Mobile Testbed
Jul 2009
A series of complex dependencies conspire to make it difficult to model mobile networks, including mobility, channel and radio characteristics, and power consumption. To address these challenges,...
Provided by Association for Computing Machinery
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White Papers
On the Limits of Effective Hybrid Micro-Energy Harvesting on Mobile CRFID Sensors
Jun 2010
Mobile sensing is difficult without power. Emerging Computational RFIDs (CRFIDs) provide both sensing and general-purpose computation without batteries-instead relying on small capacitors charged...
Provided by Association for Computing Machinery
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White Papers
Multi-User Data Sharing in Radar Sensor Networks
Nov 2007
This paper focuses on a network of rich sensors that are geographically distributed and argue that the design of such networks poses very different challenges from traditional "Mote-class" sensor...
Provided by Association for Computing Machinery
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White Papers
Modelling and Simulation Techniques for Highly Integrated, Low-Power Wireless Sensor Networks
Sep 2007
The design of state-of-the-art low-power wireless sensor nodes involves the convergence of many technologies and disciplines. Submicron Complementary Metal Oxide Semiconductor (CMOS) devices,...
Provided by Institution of Engineering and Technology
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White Papers
An Ultra-Low-Power Power Management IC for Energy-Scavenged Wireless Sensor Nodes
Apr 2008
A power interface IC is designed and demonstrated to convert and manage power for a wireless tire pressure sensor node. The IC includes two switched-capacitor DC-DC converters to supply power to...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Content Management and Replication in the SNSP: A Distributed Service-Based OS for Sensor Networks
Jan 2008
This paper presents data management and replication techniques used by the SNSP, a distributed operating system for sensor networks. Three replication schemes, a deterministic, a distributed...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
Distribution of Path Durations in Mobile Ad-Hoc Networks - Palm's Theorem to the Rescue
Jan 2011
The authors first study the distribution of path duration in multi-hop wireless networks. This paper shows that as the number of hops along a path increases, the path duration distribution can be...
Provided by University of Maryland
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White Papers
Improving Location Management in Mobile IPv4 Networks
Jun 2009
The Mobile IP Standard has been developed to support mobility over the Internet. This standard contains several drawbacks as in the cases where packets are routed via sub-optimal paths and...
Provided by American University of Beirut
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White Papers
Mobile Ad-Hoc Service Grid - MASGRID
Jun 2009
Mobile devices, which are progressively surrounded in the everyday life, have created a new paradigm where they interconnect, interact and collaborate with each other. This network can be used for...
Provided by Muhammad Ali Jinnah University
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White Papers
On the Impact of Correlation on Distributed Detection in Wireless Sensor Networks With Relays Deployment
Aug 2009
In this paper, a binary hypothesis distributed detection problem in correlated wireless sensor networks with cooperative relays deployment is considered. In particular, the effect of correlation...
Provided by Institute of Electrical and Electronics Engineers
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White Papers
On Relay Nodes Deployment for Distributed Detection in Wireless Sensor Networks
Aug 2008
In this paper, the problem of deploying relay nodes in wireless sensor networks will be considered. A system consisting of a set of sensor nodes communicating to a fusion center, where decisions...
Provided by Institute of Electrical and Electronics Engineers
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Whitepapers
A Novel Pilot Aided Joint Carrier Frequency Offset Estimation and Compensation for OFDMA Uplink Systems
Apr 2008
In the uplink of Orthogonal Frequency Division Multiple-Access (OFDMA) systems, before the data detection could be carried out, the Carrier Frequency Offset (CFO) must be estimated and compensated...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
A Low Complexity Null Subcarrier Aided Frequency Offset Estimation Technique for OFDM
Apr 2008
In this paper, a novel scheme for the carrier frequency offset estimation in OFDM communication systems is proposed. While the conventional null subcarrier based methods estimate the offset by a...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
An Efficient Frequency Offset Estimation Scheme for Multi-Band OFDM Ultra-Wideband Systems
Apr 2008
A frequency offset estimation scheme is presented for coarse frequency offset estimation of Ultra-WideBand (UWB) Multi-Band Orthogonal Frequency Division Multiplexing (MBOFDM) systems. Cramer Rao...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Training Aided Frequency Offset Estimation for MIMO OFDM Systems Via Polynomial Rooting
Apr 2008
In this paper, the authors investigate training aided frequency offset estimation for Multiple-Input Multiple-Output (MIMO) Orthogonal Frequency Division Multiplexing (OFDM) systems via polynomial...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Transmit Beamforming With Reduced Feedback Information in OFDM Based Wireless Systems
Apr 2008
This paper considers a transmit beamforming scheme that works with reduced feedback information in OFDM based Multiple-Input Single-Output (MISO) wireless systems. The proposed scheme generates...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Analysis of a Simplified Channel Estimator for MIMO Frequency Selective Channels
Apr 2008
Channel estimation for Multiple-Input, Multiple-Output (MIMO) systems is studied in this paper. In particular, the authors present a simplified MIMO channel estimator based on orthogonal design....
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Error Rate Based SNR Estimation in the Railway Satellite Communication Environment
Apr 2008
The potential of an SNR estimation technique for use in links subject to multipath propagation and periodic shadowing is investigated. The proposed SNR estimator relies on the bit error rate of...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Symbol Error Probability of M-QAM in Multihop Communication Systems With Regenerative Relays
Apr 2008
The authors analyze the performance of multihop communication systems with regenerative relays in terms of the average Symbol Error Probability (SEP) for M-ary Quadrature Amplitude Modulation...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Field Results on MIMO Performance in UMB Systems
Apr 2008
The paper presents MIMO field performance results observed using an Ultra Mobile Broadband (UMB) testbed network. The authors evaluate metrics such as antenna correlations and channel condition...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
BER Performance of Joint THP/pre-FDE
Apr 2008
Recently, Frequency-Domain Equalization (FDE) based on the Minimum Mean Square Error (MMSE) criterion has been attracting much attention to overcome the frequency-selective fading channel. The Bit...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Power Allocation for Layered MIMO Systems With Real-Time and Best-Effort Traffics
Apr 2008
In Multiple Input Multiple Output (MIMO) relay networks, an MIMO node can relay different traffics from multiple MIMO source nodes. The authors consider the power allocation across multiple layers...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Performance Comparison of Max-Delay Constrained Schedulers in Rayleigh Fading Channels
Apr 2008
The authors consider the energy efficient scheduling of packets for a single user wireless link. They propose packet schedulers that meet individual per-packet maximum-delay constraints and...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
On the Stability of Adaptive Transmission System With Queue for Packet Communications Over Fading Channels
Apr 2008
For effective transmission over fading channels, the adaptive transmission becomes promising. In particular, the Adaptive Modulation and Coding (AMC) can be used with known Channel State...
Provided by Swansea University
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Whitepapers
A New Overloading Scheme for Cellular DS-CDMA Using Orthogonal Gold Codes
Apr 2008
Overloading is a scheme to accommodate more users than the spreading factor N. This is a bandwidth efficient scheme to increase the number of users in a fixed bandwidth. One of the efficient...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Decomposition-Based Joint Subcarrier and Power Allocation Algorithm for OFDM Downlink System
Apr 2008
In this paper, the authors propose a decomposition-based joint subcarrier and power allocation algorithm for the downlink OFDM system, which maximizes the system throughput while maintaining each...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Transmit Diversity for DS-CDMA/MMSE-FDE With Frequency-Domain ICI Cancellation
Apr 2008
Frequency-Domain Equalization (FDE) based on the Minimum Mean Square Error (MMSE) criterion can provide a better Bit Error Rate (BER) performance than rake combining. However, the residual...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
A Stochastic Gradient LMS Algorithm for Digital Compensation of Tx Leakage in Zero-IF-Receivers
Apr 2008
In frequency division duplex transceivers the transmit signal is leaking through the duplexer into the receive branch. For the case of Zero-IF receivers the nonlinearity of the I/Q down converter...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Phase Error Suppression for Multi-Band OFDM-Based UWB Systems
Apr 2008
This paper proposes an efficient phase error suppression technique for multi-band Orthogonal Frequency Division Multiplexing (OFDM) based Ultra-WideBand (UWB) systems. The proposed scheme consists...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Ranging Implementation for IEEE 802.15.4a IR-UWB Systems
Apr 2008
This paper discusses ranging for IEEE 802.15.4a Impulse-Radio Ultra-WideBand (IR-UWB) system, especially targeting implementation. The essential capabilities for ranging are the ranging counter...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
On Parallelizing the CryptMT Stream Cipher
Apr 2008
Fast stream ciphers are used extensively for encrypted data transmission in mobile networks and over multigigabit links. CryptMT, a recently proposed stream cipher, is one of the final candidates...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
On the Capacity Optimization for MIMO Ad Hoc Networks
Apr 2008
Maximizing the system mutual information for MIMO ad hoc networks is considered in this paper. The authors first give a brief overview of the non-linear optimization methods and systematically...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
On Reduced-Complexity Soft-Output Detection of Continuous Phase Modulations
Apr 2008
The authors compare low-complexity schemes for soft-output detection of Continuous Phase Modulations (CPMs). In particular, they address the problem of minimizing the complexity of the front end...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Layered Random Beamforming OFDMA With Fair Scheduling Algorithms
Apr 2008
This paper presents performance analysis of Layered Random Beamforming (LRB) - MIMO-OFDMA employing various resource scheduling algorithms with feedback reduction in a realistic outdoor...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Probabilistic Equalizer for Ultra-Wideband Energy Detection
Apr 2008
This paper proposes an efficient way of interference mitigation for ultra-wideband energy detection. A receiver for pulse position modulation systems is investigated. The inter-slot (i.e.,...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
A Novel Blind Channel Estimation Algorithm for a MIMO System
Apr 2008
In this paper, a novel blind channel estimation algorithm for a Multiple Input Multiple Output (MIMO) system is described. This algorithm is easier to implement than the previously reported blind...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Blind Detection of CDMA System Using Iterative Variable Step-Size Approach
Apr 2008
This paper considers the problem of blind source separation of synchronous code division multiple access in non Gaussian channels. A novel algorithm based on variable step-size is proposed that...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
SAIC Based Iterative Receivers for MC-CDMA Cellular Systems
Apr 2008
In this paper, the authors consider iterative detector/ receiver based on Single Antenna Interference Cancellation (SAIC) techniques for Multi-Carrier Code Division Multiple Access (MC-CDMA)...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Robust Transmit Multiuser Beamforming Using Worst Case Performance Optimization
Apr 2008
The authors address the problem of transmits beamforming under channel uncertainties for a multiuser MIMO system, where both the transmitter and the receiver are equipped with multiple antennas....
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
A Novel Quasi-Orthogonal Space-Frequency Block Code for Single-Carrier FDMA
Apr 2008
Single-Carrier Frequency Division Multiple Access (SC-FDMA) is a recent modulation technique combining most of the advantages of Orthogonal Frequency Division Multiple Access (OFDMA) with the low...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Broadband MIMO Beamforming for Frequency Selective Channels Using the Sequential Best Rotation Algorithm
Apr 2008
For a narrowband Multi-Input Multi-Output (MIMO) system the singular value decomposition has the ability to provide multiple spatial channels for data transmission. The authors extend this work to...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Effects of Virtual Carriers of Channel Estimation for OFDM Systems With Transmit Diversity
Apr 2008
In this paper, the performance of Discrete Fourier Transform (DFT) based Channel Estimation (CE) for Orthogonal Frequency Division Multiplexing (OFDM) systems with transmit antenna diversity is...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
LDPC Coded AMC Based on Decoding Iteration Times for OFDM Systems
Apr 2008
A Low-Density Parity-Check (LDPC) coded Adaptive Modulation and Coding (AMC) strategy is presented for Orthogonal Frequency Division Multiplexing (OFDM) systems. Since, system performance is...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Binary Demodulation in Rayleigh Fading With Noisy Channel Estimates - Detector Structures and Performance
Apr 2008
In previous work, the authors studied the structure and performance of optimum maximum-likelihood receivers for binary antipodal and orthogonal signals in the presence of Gaussian-distributed...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Space-Time Channel Shortening Based Spatial Multiplexing Techniques Using Uplink-Downlink Duality
Apr 2008
The authors consider the problem of performing spatial multiplexing in a multiuser system with multipath channels. The proposed solution is based on space-time channel shortening, where they...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Performance of MIMO Aware RRM in Downlink OFDMA
Apr 2008
This paper addresses advanced Radio Resource Management (RRM) algorithms for Multiple-Input Multiple-Output (MIMO) transmission schemes in downlink OFDMA systems. The analysis covers the main RRM...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Multi-Degree Adaptive Cyclic Delay Diversity With Multi-User Scheduling
Apr 2008
Multi-carrier based radio access schemes have been widely accepted as one of the PHY candidates in many standards, for their capabilities not only to combat multi-path propagation, but also to...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Time-Domain Joint Estimation of Fine Symbol Timing Offset and Integer Carrier Frequency Offset
Apr 2008
In this paper, the authors propose an efficient synchronization method to jointly estimate fine Symbol Timing Offset (STO) and integer Carrier Frequency Offset (CFO). The proposed method is to...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Interference Mitigation in Turbo-Coded OFDM Systems Using Robust Statistics
Apr 2008
A robust cost function for Log Likelihood Ratio (LLR) computation is proposed for turbo coded OFDM systems in the presence of NarrowBand Interference (NBI) and Co-Channel Interference (CCI). In...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Cooperative Diversity With Blind Relays in Nakagami-m Fading Channels: MRC Analysis
Apr 2008
Cooperative diversity/relaying have drawn considerable attention as an efficient strategy to enhance communication reliability in slow fading wireless environments. Without any sort of signal...
Provided by Institute of Electrical & Electronic Engineers
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Whitepapers
Performance Evaluation of Multicarrier CDMA Systems in the Presence of Carrier Frequency Offset With Beamforming Techniques
Apr 2008
In this paper, the performance of MultiCarrier (MC) Code-Division Multiple Access (CDMA) systems in the presence of Carrier Frequency Offset (CFO) with beamforming techniques is evaluated. A...
Provided by Institute of Electrical & Electronic Engineers
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