Liverpool John Moores University

Displaying 1-40 of 121 results

  • White Papers // Jun 2013

    Secure Cloud Computing for Critical Infrastructure: A Survey

    Cloud computing has been considered as one of the promising solutions to the authors' increasing demand for accessing and using resources provisioned over the Internet. It offers powerful processing and storage resources as on-demand services with reduce cost, and increase efficiency and performance. All of these features and more encourage...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2013

    Mobile Devices: In-Network Anti-Malware Analysis

    Mobile devices are becoming integrated with appliances in the people homes, with ever present sensors, actuators and network capabilities new threats are surfacing that interfere with user's possessions, well-being and privacy in the growing Internet of Things. The most familiar type of device in this evolution of technology is the...

    Provided By Liverpool John Moores University

  • White Papers // Aug 2012

    High Performance OFDM Systems for Digital Video Broadcasting-Terrestrial (DVB-T)

    Digital wireless communication has become one of the most exciting research topics in the electrical and electronic engineering field due to the explosive demands for high-speed wireless services, such as cellular video conferencing. Digital Video Broadcasting-Terrestrial-Second generation (DVB-T2) has been demonstrated to provide services with very high spectral efficiency and...

    Provided By Liverpool John Moores University

  • White Papers // Jul 2012

    Extending AOP Principles for the Description of Network Security Patterns

    Aspect oriented programming is increasingly being used for the practical coding of cross-cutting concerns woven throughout an application. However, most existing AOP point-cut definition languages don't distinguish in their application between different systems across a network. For network security there is a need to apply different aspects depending on the...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2012

    Energy Efficient Clustering Approach for Cooperative Spectrum Sensing in Cognitive Radio Networks

    Spectrum sensing is the key element in cognitive radio networks for detecting the primary users. Due to the destructive conditions of sensing channel such as multipath fading and shadowing, local sensing is not fitting the requirements for reliable detection. Therefore, cooperative spectrum sensing is introduced to detect the primary user...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2012

    A Survey of Trust Management in Mobile Ad-Hoc Networks

    Distributed ad-hoc networks with no centralised node of command such as MANETs offer an interesting challenge in establishing trust between nodes for the purposes of network security. As a subjective measure of belief for behaviour; trust values can be calculated and propagated between each node to promote confidence between cooperating...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2012

    Ad-Hoc Cloud Networks: A Probabilistic Model for Vulnerability Detection in Critical Infrastructure Using Bayesian Networks

    The use of sensor nodes in the authors' society is becoming more ubiquitous and also looks to expand more in the nearest future. This is because most recent technological devices are now having inbuilt wireless sensor nodes which lead to different questions of how these devices' capabilities could support heterogeneous...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2012

    Enhancing Security of Data and Their Related Processing in Cloud Computing

    Cloud computing is attracting huge attention from both the academic and commercial fields thanks to its provision of vast amounts of shared computing resources for Internet users. However, moving private or sensitive data and their related processing into clouds while offering data owners no physical and only limited digital control...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    A Simulation Based Study of Energy Efficient Packet Size Estimation for Ad-hoc Networks

    This paper addressed the energy efficient optimal packet size of ad-hoc networks. Adopting the optimal packet size not only reduces the packet error rate but also balance the packet header/trailer overhead. Hence, the number of packets drop is reduced and efficiency level is increased. Comparing to other similar efforts the...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    Impact of High Density and High Speed on AODV and DSR Routing Protocols

    Mobile Ad hoc NETworks (MANET) allow versatile communication between hosts that are moving around. Routing of packets in such networks, which have no fixed infrastructure, is a continuing challenge. As the number of nodes in an area increases, the scope for increased interference between nodes increases. Also as nodes move...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    Asymmetric Data-Centric State Driven Architecture for Energy Management of Appliances

    The drive to reduce carbon emissions and the move to less controllable energy sources has forced governments, energy producers, utilities and consumers to make the management of energy consumption a high priority. Appliances are a significant and uncontrolled contributor to consumption and the way in which they consume is not...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    System-of-Systems Monitoring: A Survey

    System-of-Systems (SoS) implementations are subject to additional security concerns, due in part to their largely ad-hoc and unpredictable nature. The structure, dynamicity, complexity and scale of a SoS results in the system boundaries being largely unknown. As each implementation is uniquely composed, the behaviour exhibited whilst individual components connect, interoperate...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    Effect of Network Traffic Density on Energy Performance of Data Centre

    A pilot investigation into why data centers consume enormous energy has been observed using a data centre test-bed within the University of Salford Computer Network and Telecommunication Research Center Laboratory, a skeletal version of the computing core of a typical data center. Over a consecutive two months 'Peak and off-peak...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    Forensic Analysis of Distributed Service Oriented Computing Platforms

    Cloud computing is quickly becoming pervasive. Millions of concurrent users are taking advantage of the flexibility offered by cloud computing platforms. The use of the large scale global storage provided by cloud computing presents a barrier to existing digital forensic techniques which were developed to target single hosts containing a...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    Pre-Authentication and Selection of Suitable Target Base Station During Handover Procedure in Mobile WiMAX Network

    WiMAX (Worldwide Interoperability for Microwave Access) is an emerging technology that can provide wireless broadband access at the data rates of 70 Mbps over 50 kilometres to both home and business customers. WiMAX is cost effective and offers higher data rates than other wireless networks. It supports both fixed and...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    On the Capacity Region of Promising Multiple Access Techniques

    One of the important issues involved in the development of future wireless communication systems is the multiple access technique employed to share the available spectrum among users efficiently. In this paper, the authors present intensive investigation on the capacity region of conventional and some promising multiple access techniques for mobile...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    Power Distribution Investigation of a Diffused Cellular Indoor Visible Light Communication System

    This paper presents a Three Dimensions (3D) model of optical power distribution in a diffused cellular indoor Visible Light Communication (VLC) system. To achieve an ideal system which has a maximum coverage area with a minimum power consumption, both hexagon geometric structure and holographic Light Shaping Diffuser (LSD) are employed....

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    Small Antennas for Cognitive Radio Using Negative Impedance Converters

    There is a need for small antennas in mobile and handheld cognitive radios. These antennas are also required to be either wideband or have a wide tuning range. The authors used a non-Foster matching network to achieve wideband matching and also demonstrate tuning. They also simulated the noise and Inter-Modulation...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    Reducing Cost and Contention of P2P Live Streaming Through Locality and Piece Selection

    The use of locality within Peer-To-Peer (P2P) networks is ensuring the construction of overlay networks that are both economically viable for network operators and scalable. However, the underlying protocols on which traditional P2P overlays are based rapidly have to evolve in order to better support more time sensitive, real-time video...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    Memory Threads: Organizing Digital Memories to Organize Social P2P Networks

    Human remember their memories based on some reference which helps in recalling those memories. These references are usually common for many people, objects, places and so on. The authors organize human digital memories in the form of memory threads, according to the references of the memories in order to present...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    A Geographic QoS Peer-to-Peer Streaming Framework, for High-Quality Transmission of Multimedia Content over Wireless Mesh Networks in Disaster Recovery Scenarios

    The use of mobile devices capable of wireless communications such as mobile phones, PDAs, and laptops in disaster recovery has been an important research topic for several years. However, while the majority of previous research has focused on voice and data communications a small number of researchers have proposed the...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    System Monitoring for Digital Forensic Investigation

    System monitoring provides a useful pre-emptive solution to the problem of gathering information about how a system behaves at run-time for post-hoc analysis by system administrators and forensic experts. However, existing techniques are insufficient to support post-hoc event reconstruction in large-scale systems. The authors propose a distributed trace-based system monitor...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    Speeding and Efficiency Increasing of Color Biometric Finger Print Identification Using Particle Swarm Optimization Based On Selected Feature by Multiwavelet

    Biometric FingerPrint Identification (BFPI) by Feature Selection (FS) is a global optimization problem in machine learning, which reduces the number of features, removes irrelevant, noisy and redundant data, and results in acceptable recognition accuracy. It is the most important step that affects the performance of a pattern recognition system. This...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    Towards a Framework for Operational Support in Critical Infrastructures

    Critical infrastructures include sectors such as energy resources, finance, food and water distribution, health, manufacturing, government services and in some cases people. The consequences of an attack on one of these would result in loss of life, economic damage or a devastating effect on the operation of government services and...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    Robust Digital Image Watermarking Using Region Adaptive Embedding Technique

    Improving the robustness of watermark in withstanding attacks has been one of the main research objectives in digital image watermarking. In this paper, the authors propose a novel region-adaptive watermarking technique that can provide improvements in both robustness and visual quality of the watermarks when compared to the original, non-region-adaptive,...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    Fundamental Analysis of Hybrid Free Space Optical and Radio Frequency Communication Systems

    Free-Space Optical (FSO) communication systems have been identified as a complementary solution to resolve the existing "Last mile" problems. Nevertheless, the inherent susceptibility of this technology option to various adverse atmospheric conditions has initiated research interests in hybrid FSO and Radio Frequency (RF) systems. In this paper, the authors investigate...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    Efficient Bandwidth Measurements of Thin Film Filters for Next-Generation Optical Access

    The authors have measured differential group delay of thin film filters devices with 200 GHz and 100 GHz full width half maximum bandwidth employing method based on Jones Matrix Eigen-analysis and have evaluated efficient bandwidth of thin film filters devices utilizing 2.5 Gbit/s and 10.3125 Gbit/s optical signals to draw...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    Coordination of Energy Efficient Sensing and Transmission in Cognitive Radio Networks

    To improve spectrum efficiency, Cognitive Radio (CR) is designed to allow unlicensed (secondary) users to utilize the licensed spectrum when it is not used by the licensed (primary) users. Because of the dynamic nature of cognitive radio network, the resource allocation targeting at best system performance becomes more and more...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    Connectivity Dynamics Under Microscopic Parameters in Signalized Heterogeneous Traffic Flow for VANET

    The issue of connectivity in Vehicular Ad-hoc NETwork (VANET) is influenced by the diverse characteristics of traffic flow on the road. The authors have applied fluid dynamic model and captured the connectivity dynamics considering microscopic aspects in heterogeneous traffic flow in a signalized urban road environment. The applied model incorporates...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    A Systematic Study of the Behaviour of the PMEPR in Relation to OFDM Design Parameters

    The design of systems with enhanced Quality of Service (QoS) and improved power efficiency has evolved into an intensive research area in wired and wireless communications engineering. Orthogonal Frequency Division Multiplexing (OFDM) has been proven to have the potential to achieve high data rates, adapt to severe channel conditions and...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    Reputation-Based Non-Cooperative Auction Game Competitive for Spectrum Sharing in Cognitive Radio Networks

    Cognitive radio is a novel technique to improve utilization efficiently of the radio spectrum. In this paper, the authors consider the problem sharing among a primary user and a group of secondary users. This problem is formulated on sealed-bid auction, in which each secondary user with high reputation can share...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    Iterative Coloring Technique for the Generation of Correlated Rayleigh Fading Envelopes for Multi-Antenna and Multicarrier Systems

    In this paper, a simple technique is proposed for the generation of equal power correlated Rayleigh fading envelopes for multi-antenna and multicarrier systems with any desired correlation factors. It employs iterative coloring of uncorrelated reference envelopes using real correlation matrix of envelopes rather than complex covariance matrix of the Gaussian...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    CIA Security Management for Wireless Sensor Network Nodes

    Wireless Sensor Networks (WSN) have become a complete solution in making use of low power implementation and embedded systems. Nevertheless, the many constraints arising from low communication range, limited computing power, lack of availability of networking protocol, programming in the absence of certainty and security lapses in the areas of...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    Identity-Based Attacks Against Reputation-Based Systems in MANETs

    In multihop networks such as mobile ad hoc networks selfish or misbehaving nodes can disrupt the whole network and severely degrade network performance. Reputation, credit and trust based schemes have been developed to enforce cooperation and discourage node misbehaviour. These models are vulnerable to two types of attack. First, a...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    A Symmetric Key Generation and Pre-Distribution Scheme for WSN Using MRD Codes

    This paper addresses the problem of secure path key establishment in WSN using a key pre-distribution scheme. In this paper, first the authors have proposed a symmetric key generation scheme using Maximum Rank Distance(MRD) codes and then they have proposed a path establishment algorithm. Their scheme not only substantially improves...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    A Framework for Providing a Secure System of Systems Composition

    The area of System of Systems research is focused on using multiple complex and disparate systems to provide goal orientated solution that provides functionality greater than its component parts. The paper highlights some of the authors' research into the area of System of Systems (SoS) and their security and composition...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    Link Quality Based Ant Routing Algorithm for MANETs (LQARA)

    The used routing algorithms for Mobile Ad hoc NETworks (MANETs) are inherited from the conventional ones which makes them subject of numerous criticisms since they do not take into consideration all the characteristics of ad hoc networks such as mobility and medium constraints. In this paper, the authors propose a...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    A Unified Architecture for Video Delivery Over the Internet

    Since 1994 when ABC's "World News Now," was first broadcast across the Internet, multimedia dissemination has evolved along distinct and unique paths, resulting in two distribution methods that are commonly used across today's Internet, namely Over-The-Top TeleVision (OTT-TV) and Internet Protocol TeleVision (IPTV). With an increasing amount of video content...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    Cognitive Attributes in a Mobile Ad-Hoc Network

    This paper presents an initial investigation into the feasibility of improving end-to-end delay or better meeting mission objectives in a Mobile Ad-hoc NETwork (MANET) environment by applying existing methodologies that have been proposed in Cognitive Networks (CNs). MANETs are networks without a predefined infrastructure with very limited resources as opposed...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    Designing a Protocol to Support Multicast Mobility in IPv6 Network

    In this paper, the authors describe a new extended protocol framework for IPv6 WiFi networks, which handle multicast services whilst changing the WiFi zone within a wireless network. They modify the Mobile IPv6 function to support their framework and use ICMPv6 to maintain the multicast connection route. In addition, they...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2009

    Monitoring Connectivity in Wireless Sensor Networks

    It is important to have continuous connectivity in a wireless sensor network after it is deployed in a hostile environment. However, such networks are constrained by the low user-to-node ratio, limited energy and bandwidth resources, entities that are usually mobile, networks without fixed infrastructure and frequent failure due to problems...

    Provided By Liverpool John Moores University

  • White Papers // May 2009

    Design Considerations for Fault Management in Wireless Sensor Networks

    Wireless Sensor Networks (WSNs) are envisioned as densely deployed tiny sensors, left unattended to monitor and interact with physical and environmental phenomena. Faults and failures are inevitable in WSNs due to the inhospitable environment and unattended deployment. In this paper, the authors survey fault management in WSNs, and review and...

    Provided By Liverpool John Moores University

  • White Papers // May 2009

    An Evaluation of Positioning System for Wireless Sensor Networks in an Indoor Environment

    Wireless sensor network is a network system that deploys hundreds of wireless sensor nodes that can communicate with each other to detect, for example temperature, moisture, light, pressure, and etc. Knowing the location of the sensor node is critically important in specific applications. For example in asset management, the known...

    Provided By Liverpool John Moores University

  • White Papers // May 2009

    Network Connectivity in Wireless Sensor Networks: A Survey

    Wireless sensor nodes are resource constrained and mostly operate in unsafe environments. Displacement, communication blockage and frequent failure of wireless sensor nodes cause network topology to become very dynamic that affects network connectivity. Lack of topological connectivity between nodes may lead the entire network to break apart into disconnected pieces....

    Provided By Liverpool John Moores University

  • White Papers // May 2009

    SecRose: A Data Transportation Layer Security Mechanism for Wireless Sensor Networks

    The authors introduce the final version of SecRose, a mechanism for secure transferring of data in a Wireless Sensor Network (WSN). SecRose is based on improvements in existing proposals plus a set of distinctive novel characteristics. Major Features include encrypted and authenticated communications, integrated key management and categorisation of communication...

    Provided By Liverpool John Moores University

  • White Papers // May 2009

    Towards a New Context Representation, Maintenance and Discovery in Mobile Ad Hoc Networks

    Context maintenance and discovery, which aim to represent, manage and share context information, have been discussed since context-awareness was presented in the 1990s. These become more challenging when being applied to a ubiquitous environment where dynamic and distributed computing happens anytime, anywhere. In this paper, a new approach to context...

    Provided By Liverpool John Moores University

  • White Papers // May 2009

    Multi-Level Threshold Handover for Homogeneous Wireless Mobile Networks

    Handover latency is one of the major problems in wireless mobile networks since it prevents users from seamless mobility. When a mobile node moves from one wireless access point to another in a homogeneous network environment, it has to perform horizontal handover. During the handover procedure the mobile node can...

    Provided By Liverpool John Moores University

  • White Papers // May 2009

    Performance Evaluation of a WiMAX Enabled HAPs-Satellite Hybrid System

    Hybrid technologies using different types of wireless platforms can be used for providing Internet Protocol (IP) Broadband services to areas where no communication infrastructure exists. Such hybrid systems can be configured to run applications with high speed data rates and low delay times. A new hybrid architecture consisting of High...

    Provided By Liverpool John Moores University

  • White Papers // May 2009

    Study of the Atmospheric Turbulence in Free Space Optical Communications

    In this paper the effect of atmospheric turbulence on Free Space Optical (FSO) communications is investigated experimentally by designing a turbulence simulation chamber. The distributions of bits '0' and '1' levels are measured with and without turbulence. The Bit Error Rate (BER) is then obtained from the distributions. The temperature...

    Provided By Liverpool John Moores University

  • White Papers // May 2009

    NetSecure: A Context Aware Based Online Security Framework

    Location and Context Aware Computing are playing an important role within the field of networks and telecommunications. Consequently, the ability to determine the exact location of a device on the internet can not only optimise the shipment of data from end-to-end, but additionally lead to innovative location based services. Such...

    Provided By Liverpool John Moores University

  • White Papers // May 2009

    User-Centred Identity Management in Mobile Ad-Hoc Networks

    Digital identity is at the heart of many contemporary strategic innovations, ranging from crime, internal and external security, business models etc. This requires disclosing personal information within ubiquitous environment. These raise serious security concerns and discomfort to users and creates the needs of a user centred Identity Management (IM) within...

    Provided By Liverpool John Moores University

  • White Papers // May 2009

    A Priority Based Routing Protcol for Wireless Sensor Networks

    Recently, the demands on wireless sensor networks have switched from low traffic rate and static topology to more challenging requirements in order to meet the rapid expansion of WSN into various domain applications. This paper proposes a seamless cross layer solution that integrates network layer and medium access control to...

    Provided By Liverpool John Moores University

  • White Papers // May 2009

    Formal Modelling and Analysis of Routing Protocol Security in Wireless Sensor Networks

    Wireless Sensor Networks (WSN) is composed of small, low cost, resource-constrained computing nodes equipped with low power wireless transceivers. Generally, they are embedded in their environment to perform some specific monitoring and/or control function. Unlike wired networks that have dedicated routers for network connectivity and message forwarding, every node in...

    Provided By Liverpool John Moores University

  • White Papers // May 2009

    Investigation of MANET Routing Protocols for Mobility and Scalability

    This paper focuses on performance investigation of reactive and proactive MANET routing protocols, namely AODV, DSR, TORA and OLSR. MANET is a type of Ad Hoc network, and here its functionality is based on 802.11 IEEE standards to communicate in a discrete and disperse environment with no central management. Hence,...

    Provided By Liverpool John Moores University

  • White Papers // May 2009

    A New Routing Protocol for MANET

    A Mobile Ad hoc NETwork (MANET) is a collection of mobile hosts that move in different directions and speeds without the need to maintain connectivity with existing network infrastructure. Different routing protocols have been designed since the existence of ad hoc networks. This paper presented below proposes a new routing...

    Provided By Liverpool John Moores University

  • White Papers // May 2009

    Usability Metric Framework for Mobile Phone Application

    Measuring usability is an essential task to ensure the application is accurate, has sufficient in speed and to ensure the safety of the user from strain injury as well. The increasing number of mobile phone users means that many businesses have deployed mobile applications to gain competitive advantage. Literature on...

    Provided By Liverpool John Moores University

  • White Papers // May 2009

    Simulating Autonomous Mobile Programs on Networks

    Autonomous Mobile Programs (AMPs) have been proposed for load management in dynamic networks. An AMP is aware of its resource needs and periodically seeks a better location in the network to reduce execution time. AMPs have previously been measured using mobile Java Voyager on Local Area Networks (LANs). The authors...

    Provided By Liverpool John Moores University

  • White Papers // May 2009

    Approaches to Modelling and Analysis for Performability Evaluation of Handoff Schemes in Wireless Cellular Networks

    Most wireless communication and mobile computing systems are expected to be operational 24 hours a day, 7 days a week. However, wireless communication systems encounter failures. In wireless cellular systems, handoff and system failure factors cause the degradation of the overall system performance. It is essential to consider handoff phenomena...

    Provided By Liverpool John Moores University

  • White Papers // May 2009

    A Novel Louvered Array Element Geometry & Spatial Filter/ "Ray-Bending" Lens for a Low Profile Satellite Communications On-the-Move Hybrid Phased Array Antenna

    A novel design solution for a low-profile full-duplex Satellite Communications-On-The-Move hybrid scanned phased array antenna for low elevation angle coverage (down to 10?) is described. The antenna is operated at Ku-Band. The unique louvered array element geometry in combination with a spatial filter/ "Ray bending" lens facilitates the shaping of...

    Provided By Liverpool John Moores University

  • White Papers // Nov 2010

    A Self-Managing Fault Management Mechanism for Wireless Sensor Networks

    A sensor network can be described as a collection of sensor nodes which co-ordinate with each other to perform some specific function. These sensor nodes are mainly in large numbers and are densely deployed either inside the phenomenon or very close to it. They can be used for various application...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2009

    A Fitted Random Sampling Scheme for Load Distribution in Grid Networks

    Grid networks provide the ability to perform higher throughput computing by taking advantage of many networked computer's resources to solve large-scale computation problems. As the popularity of the Grid networks has increased, there is a need to efficiently distribute the load among the resources accessible on the network. In this...

    Provided By Liverpool John Moores University

  • White Papers // Aug 2012

    High Performance OFDM Systems for Digital Video Broadcasting-Terrestrial (DVB-T)

    Digital wireless communication has become one of the most exciting research topics in the electrical and electronic engineering field due to the explosive demands for high-speed wireless services, such as cellular video conferencing. Digital Video Broadcasting-Terrestrial-Second generation (DVB-T2) has been demonstrated to provide services with very high spectral efficiency and...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2012

    Energy Efficient Clustering Approach for Cooperative Spectrum Sensing in Cognitive Radio Networks

    Spectrum sensing is the key element in cognitive radio networks for detecting the primary users. Due to the destructive conditions of sensing channel such as multipath fading and shadowing, local sensing is not fitting the requirements for reliable detection. Therefore, cooperative spectrum sensing is introduced to detect the primary user...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2012

    A Survey of Trust Management in Mobile Ad-Hoc Networks

    Distributed ad-hoc networks with no centralised node of command such as MANETs offer an interesting challenge in establishing trust between nodes for the purposes of network security. As a subjective measure of belief for behaviour; trust values can be calculated and propagated between each node to promote confidence between cooperating...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    Reducing Cost and Contention of P2P Live Streaming Through Locality and Piece Selection

    The use of locality within Peer-To-Peer (P2P) networks is ensuring the construction of overlay networks that are both economically viable for network operators and scalable. However, the underlying protocols on which traditional P2P overlays are based rapidly have to evolve in order to better support more time sensitive, real-time video...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    Memory Threads: Organizing Digital Memories to Organize Social P2P Networks

    Human remember their memories based on some reference which helps in recalling those memories. These references are usually common for many people, objects, places and so on. The authors organize human digital memories in the form of memory threads, according to the references of the memories in order to present...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    A Geographic QoS Peer-to-Peer Streaming Framework, for High-Quality Transmission of Multimedia Content over Wireless Mesh Networks in Disaster Recovery Scenarios

    The use of mobile devices capable of wireless communications such as mobile phones, PDAs, and laptops in disaster recovery has been an important research topic for several years. However, while the majority of previous research has focused on voice and data communications a small number of researchers have proposed the...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    System Monitoring for Digital Forensic Investigation

    System monitoring provides a useful pre-emptive solution to the problem of gathering information about how a system behaves at run-time for post-hoc analysis by system administrators and forensic experts. However, existing techniques are insufficient to support post-hoc event reconstruction in large-scale systems. The authors propose a distributed trace-based system monitor...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    Speeding and Efficiency Increasing of Color Biometric Finger Print Identification Using Particle Swarm Optimization Based On Selected Feature by Multiwavelet

    Biometric FingerPrint Identification (BFPI) by Feature Selection (FS) is a global optimization problem in machine learning, which reduces the number of features, removes irrelevant, noisy and redundant data, and results in acceptable recognition accuracy. It is the most important step that affects the performance of a pattern recognition system. This...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    Towards a Framework for Operational Support in Critical Infrastructures

    Critical infrastructures include sectors such as energy resources, finance, food and water distribution, health, manufacturing, government services and in some cases people. The consequences of an attack on one of these would result in loss of life, economic damage or a devastating effect on the operation of government services and...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    Robust Digital Image Watermarking Using Region Adaptive Embedding Technique

    Improving the robustness of watermark in withstanding attacks has been one of the main research objectives in digital image watermarking. In this paper, the authors propose a novel region-adaptive watermarking technique that can provide improvements in both robustness and visual quality of the watermarks when compared to the original, non-region-adaptive,...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    Fundamental Analysis of Hybrid Free Space Optical and Radio Frequency Communication Systems

    Free-Space Optical (FSO) communication systems have been identified as a complementary solution to resolve the existing "Last mile" problems. Nevertheless, the inherent susceptibility of this technology option to various adverse atmospheric conditions has initiated research interests in hybrid FSO and Radio Frequency (RF) systems. In this paper, the authors investigate...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    Efficient Bandwidth Measurements of Thin Film Filters for Next-Generation Optical Access

    The authors have measured differential group delay of thin film filters devices with 200 GHz and 100 GHz full width half maximum bandwidth employing method based on Jones Matrix Eigen-analysis and have evaluated efficient bandwidth of thin film filters devices utilizing 2.5 Gbit/s and 10.3125 Gbit/s optical signals to draw...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    Coordination of Energy Efficient Sensing and Transmission in Cognitive Radio Networks

    To improve spectrum efficiency, Cognitive Radio (CR) is designed to allow unlicensed (secondary) users to utilize the licensed spectrum when it is not used by the licensed (primary) users. Because of the dynamic nature of cognitive radio network, the resource allocation targeting at best system performance becomes more and more...

    Provided By Liverpool John Moores University

  • White Papers // May 2009

    Network Operator Independent Resilient Overlay for Mission Critical Applications

    This paper proposes a Resilient Overlay for Mission Critical Applications (ROMCA); a novel operator-independent overlay architecture providing a resilient and reliable service across wide-area networks. Resilience is achieved by combining centralized topology construction control and distributed dynamic mapping of paths onto the overlay topology according to network conditions. ROMCA can...

    Provided By Liverpool John Moores University

  • White Papers // May 2009

    A Generic Architecture Implementing a Formal Context Model for Context-Aware Systems

    Since context aware systems differ in the way they interact with users, the way they interpret the context of its entities and the actions they need to take, each individual system is developed in its own way with no common architecture. A number of architectures have been proposed which are...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    Connectivity Dynamics Under Microscopic Parameters in Signalized Heterogeneous Traffic Flow for VANET

    The issue of connectivity in Vehicular Ad-hoc NETwork (VANET) is influenced by the diverse characteristics of traffic flow on the road. The authors have applied fluid dynamic model and captured the connectivity dynamics considering microscopic aspects in heterogeneous traffic flow in a signalized urban road environment. The applied model incorporates...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    A Systematic Study of the Behaviour of the PMEPR in Relation to OFDM Design Parameters

    The design of systems with enhanced Quality of Service (QoS) and improved power efficiency has evolved into an intensive research area in wired and wireless communications engineering. Orthogonal Frequency Division Multiplexing (OFDM) has been proven to have the potential to achieve high data rates, adapt to severe channel conditions and...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    Reputation-Based Non-Cooperative Auction Game Competitive for Spectrum Sharing in Cognitive Radio Networks

    Cognitive radio is a novel technique to improve utilization efficiently of the radio spectrum. In this paper, the authors consider the problem sharing among a primary user and a group of secondary users. This problem is formulated on sealed-bid auction, in which each secondary user with high reputation can share...

    Provided By Liverpool John Moores University

  • White Papers // Jun 2011

    Iterative Coloring Technique for the Generation of Correlated Rayleigh Fading Envelopes for Multi-Antenna and Multicarrier Systems

    In this paper, a simple technique is proposed for the generation of equal power correlated Rayleigh fading envelopes for multi-antenna and multicarrier systems with any desired correlation factors. It employs iterative coloring of uncorrelated reference envelopes using real correlation matrix of envelopes rather than complex covariance matrix of the Gaussian...

    Provided By Liverpool John Moores University