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- Congestion Propagation Among Routers in the Internet
- In recent years, various non-linear phenomena of the Internet have been discovered. For instance, it is reported that congestion of a router propagates to neighboring routers like a wave. Several researches on congestion propagation among routers have been performed. However, in these researches, cause of congestion propagation and condition that...
- Tags: Internet, Router, Congestion Propagation, Routers & Switches, Network Technology, Networking
- White papers 2007-11-16
- User Identity Propagation in Web Service Implementation
- Implementation of Web services requires multiple levels of security, including communications security, secure access to the Web service endpoint, and identity propagation between service consumer and implementation. In this paper, one focuses on user identity propagation. One also learns about the role of identity propagation in the overall Web services...
- Tags: Web, Propagation, Web Service, User Identity, Identity Propagation, Channel Management, Web Services, Security, Marketing, Enterprise Software, Software
- White papers 2006-11-14
- Propagation Loss Models Characterization for GSM 900MHz at Kuala Lumpur and Putrajaya
- Propagation loss modelling of cellular mobile system is important for coverage design and prediction. Propagation loss models are usually used to predict the received signal strength at a certain distance from the base station. For site planning, the transmission loss and signal coverage can be predicted by a set of...
- Tags: Kuala Lumpur, Mobile, Mobile System, GSM, Propagation Loss, Advertising & Promotion, Cellular Phones, Marketing, Consumer Electronics, Personal Technology
- White papers 2005-05-26
- Update Propagation Algorithms for Supporting Disconnected Write in Mobile Wireless Systems With Data Broadcasting Capability
- This paper develops and analyzes algorithms for propagating updates by mobile hosts in wireless client-server environments that support disconnected write operations, with the goal of minimizing the tuning time for update propagation to the server. These algorithms allow a mobile host to update cached data objects while disconnected and propagate...
- Tags: Algorithm, Mobile, Broadcasting, Wireless, Engineering, Advertising & Promotion, Marketing
- White papers 2005-10-08
- Performance of Space-Frequency Coded Broadband OFDM Under Real-World Propagation Conditions
- This paper studies the impact of the propagation environment on the performance of space-frequency coded broadband OFDM systems. In particular, the paper derives the error-rate performance of space-frequency codes in the presence of transmit and receive correlation, and quantifies the maximum achievable diversity order and coding gain as a function...
- Tags: ETH Zurich, Performance, Broadband, Performance Management, OFDM, Broadband Internet, Network Technology, Telecommunications, Human Resources, Workforce Management, Wireless, Networking
- White papers
- Spatial-Temporal Modeling of Malware Propagation in Networks
- Network security is an important task of network management. One threat to network security is malware malicious software propagation. One type of malware is called topological scanning that spreads based on topology information. The focus of this paper is on modeling the spread of topological malwares, which is important for...
- Tags: Network, Propagation, Network Security, Malware, Spyware, Adware & Malware, Cyberthreats, Viruses And Worms, Security, Networking
- White papers
- True Parallel Processing in Artificial Neural Networks
- The area of artificial neural networks, which dates back to the early twentieth century, could only offer positive contributions to technology after the back-propagation algorithm was proposed in 1986. In this note an alternative algorithm to the gradient descent used in back-propagation is proposed. This algorithm is based on the...
- Tags: Algorithm, Network, Neural Network, Parallel Processing, Emerald, Engineering
- White papers 2007-10-22
- Impact of the Propagation Environment on the Performance of Space-Frequency Coded MIMO-OFDM
- Previous work on space-frequency coded MIMOOFDM has been restricted to idealistic propagation conditions. In this paper, using a broadband MIMO channel model taking into account Ricean K-factor, transmit and receive angle spread, and antenna spacing, we study the impact of the propagation environment on the performance of space-frequency coded MIMO-OFDM.
- Tags: ETH Zurich, Performance, Environment, MIMO-OFDM, Performance Management, Human Resources, Workforce Management
- White papers
- Complete Convergence of Message Passing Algorithms for Some Satisfiability Problems
- This paper makes a modest step towards providing rigorous analysis that proves the effectiveness of message passing algorithms for random 3SAT. This paper analyzes the performance of Warning Propagation, a popular message passing algorithm that is simpler than survey propagation. This paper shows that for 3CNF formulas generated under the...
- Tags: Message, Algorithm, Propagation, Convergence, Engineering, VOIP, Telecommunications, Networking
- White papers 2006-04-01
- Real-World Environment Models for Mobile Network Evaluation
- Simulation environments are an important tool for the evaluation of new concepts in networking. The study of mobile ad hoc networks depends on understanding protocols from simulations, before these protocols are implemented in a real-world setting. To produce a real-world environment within which an ad hoc network can be formed...
- Tags: Mobile Network, Mobile, Network, University Of California, Networking
- White papers
- A Study of Bluetooth Propagation Using Accurate Indoor Location Mapping
- The ubiquitous computing community has widely researched the use of 802.11 for the purpose of location inference. Meanwhile, Bluetooth is increasingly widely deployed due to its low power consumption and cost. This paper describes a study of Bluetooth radio propagation using an accurate indoor location system to conduct fine-grained signal...
- Tags: Propagation, Ubiquitous Computing, Springer Science+Business Media, Ubiquitous Computing Community, Bluetooth, Wi-Fi, Wireless
- White papers 2005-07-19
- Observations and Models of Time-Varying Channel Gain in Crowded Areas
- Testbeds are projected to be the next generation of mechanisms for protocol verification and performance validation of wireless networks. One important objective of these testbeds is to depict the propagation mechanism accurately. This paper presents measurements and models of propagation between stationary transmitters and receivers in a dynamic environment. These...
- Tags: Environment, Performance Management, Human Resources, Workforce Management
- White papers 2005-12-11
- Analysis of Belief Propagation for Non-Linear Problems: The Example of CDMA (or: How to Prove Tanaka's Formula)
- This paper considers the CDMA (Code-Division Multiple-Access) multi-user detection problem for binary signals and additive white gaussian noise. The paper proposes a spreading sequences scheme based on random sparse signatures, and a detection algorithm based on Belief Propagation BP with linear time complexity. In the new scheme, each user conveys...
- Tags: CDMA, Analysis, University Of California, Cellular Phones, Consumer Electronics, Personal Technology
- White papers 2006-02-07
- The Impact of Radio Propagation Prediction on Urban UMTS Planning
- This case study outlines the importance of an accurate radio propagation planning for UMTS networks. Due to the specific UMTS technology 3G users may experience much lower service levels then expected or even failures if the network is planned inaccurately. But dissatisfied customers and vendors of Value Added Services can...
- Tags: UMTS, Network, Radio, Cellular Phones, Advertising & Promotion, Consumer Electronics, Personal Technology, Marketing
- Case studies
- On the Relation Between Bandwidth and Robustness of UWB Channel in Complex Confined Areas
- Ultra-Wideband UWB communication has been the subject of extensive research in recent years due to its unique capabilities and potential applications, particularly in short-range multiple access wireless communications. However, many important aspects of UWB-based communication systems have not yet been thoroughly investigated. The propagation of UWB signals is the single...
- Tags: UWB, Bandwidth, Universite Laval, Ultrawideband (UWB), Wireless
- White papers 2007-07-28
- High Performance Convolutional Neural Networks for Document Processing
- Convolutional Neural Networks CNNs are well known for producing state-of-the-art recognizers for document processing. However, they can be difficult to implement and are usually slower than traditional Multi-Layer Perceptrons MLPs. This paper presents three novel approaches to speeding up CNNs: unrolling convolution, using BLAS basic linear algebra subroutines, and using...
- Tags: Document, High-performance, Microsoft Corp., BLAS, Leadership, Processors, Management, Semiconductors, Hardware, Components
- White papers 2006-02-28
- TCP-Planet: A Reliable Transport Protocol for InterPlaNetary Internet
- The space exploration missions are crucial for acquisition of information about the space and the universe. The entire success of a mission is directly related to the satisfaction of its communications needs. For this goal, the challenges posed by the InterPlaNetary Internet need to be addressed. Current TCP protocols have...
- Tags: Georgia Institute Of Technology, Internet, Performance, Performance Degradation, TCP, Tcp/Ip, Performance Management, Networking, Human Resources, Workforce Management
- White papers 2007-01-01
- Biological Models of Security for Virus Propagation in Computer Networks
- This paper discusses the similarity between propagation of pathogens viruses and worms on computer networks with proliferation of pathogens in cellular organisms organisms with genetic material contained within a membrane encased nucleus. It introduces several biological mechanisms that are used in these organisms to protect against such pathogens and presents...
- Tags: Computer Network, Network, Propagation, Albany, Virus, Computer, Productivity, Cyberthreats, Networking, Security, Viruses And Worms
- White papers 2005-04-02
- A Space-Time Receiver for MIMO-OFDM Ad Hoc Networks
- This paper proposes a receiver architecture that can demodulate multiple data streams with different frequency offsets and propagation delays in Multiple Input Multiple Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) ad hoc networks. The receiver performs joint synchronization and interference cancellation to separate these interfering data streams and achieve synchronization for...
- Tags: Frequency, University Of Texas, MIMO-OFDM, Receiver, OFDM, Wireless
- White papers 2006-03-01
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