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- A Subspace-Based Approach to Blind Channel Identification in Pulse Shaping OFDM/OQAM Systems
- This paper introduces a subspace-based algorithm for the blind identification of time-dispersive channels in pulse shaping OFDM systems based on offset QAM (OFDM/OQAM). The approach presented in this paper exploits cyclostationarity induced by the use of overlapping pulse shaping filters and uses second-order statistics only. The proposed method is similar...
- Tags: Algorithm, Method, Stanford University, OFDM, Engineering, Wireless
- White papers
- A Stream Processor Development Platform
- This paper describes a hardware and software platform for developing streaming applications. Programmers write stream programs in high-level languages, and a set of software tools maps these programs to code that runs on a streaming hardware system. The hardware platform includes two Imagine Stream Processors, together providing 32 GFLOPS peak...
- Tags: Software, Processor, Stanford University, Hardware, Hardware Platform
- White papers
- Geometric Spanner for Routing in Mobile Networks
- This paper proposes a new routing graph, the Restricted Delaunay Graph RDG, for ad hoc networks. Combined with a node clustering algorithm, RDG can be used as an underlying graph for geographic routing protocols. This graph has the following attractive properties; it is a planar graph; between any two nodes...
- Tags: Mobile Network, Graph, Mobile, Network, Stanford University, Clustering
- White papers
- Detecting Application-Level Failures in Component-Based Internet Services
- Most Internet services (e-commerce, search engines, etc.) suffer faults. Quickly detecting these faults can be the largest bottleneck in improving availability of the system. This paper presents Pinpoint, a methodology for automating fault detection in Internet services by: observing low-level, internal structural behaviors of the service; modeling the majority behavior...
- Tags: Stanford University, Behavior, Internet Service, Internet
- White papers
- Pinpoint: Problem Determination in Large, Dynamic Systems
- Traditional problem determination techniques rely on static dependency models that are difficult to generate accurately in large, distributed, and dynamic application environments such as e-commerce systems. This paper presents a dynamic analysis methodology that automates problem determination in these environments by coarse-grained tagging of numerous real client requests as they...
- Tags: Stanford University, Analysis, Productivity, Web Technology
- White papers
- Autonomous Recovery in Componentized Internet Applications
- This paper shows how to reduce downtime of J2EE applications by rapidly and automatically recovering from transient and intermittent software failures, without requiring application modifications. The prototype combines three application-agnostic techniques: macro analysis for fault detection and localization, micro rebooting for rapid recovery, and external management of recovery actions. The...
- Tags: Recovery, Stanford University, Internet Application, J2EE Application, Framework, Internet, J2Ee, Productivity, Middleware, Enterprise Software, Software Development, Software/Web Development, Software
- White papers
- An Online Evolutionary Approach to Developing Internet Services
- High dependability in Internet services is a difficult challenge: new features are constantly added, the systems are being scaled to support more users, and these systems are subject to unpredictable workloads and inputs. To deal with these challenges, operators must constantly adapt and evolve their system in response to its...
- Tags: Stanford University, Evolution, Internet Service, Internet
- White papers
- Spyware Resistant Web Authentication Using Virtual Machines
- This paper describes a security system, called SpyBlock, that protects web passwords from malicious spyware and keyloggers. The system consists of two components: a browser extension that runs in an untrusted environment with the browser and other applications, and an authentication agent that runs in an environment that is protected...
- Tags: Stanford University, Environment, Web Browser, Virtual Machine, SpyBlock, Spyware, Spyware, Adware & Malware, Cyberthreats, Web Browsers, Security, Viruses And Worms, Internet
- White papers
- Modeling Signal Attenuation in IEEE 802.11 Wireless LANs - Vol. 1
- Path loss models are used to approximate signal attenuation as a function of the distance between transmitters and receivers, being an important building block for both research and industry efforts. This paper presents experimental data that validates the use of the log-distance model both inside and outside a standard office...
- Tags: Attenuation, IEEE 802.11, Stanford University, Modeling, Wireless LANs, Research & Development, Wi-Fi, Wireless, Strategy, Business Operations, Management
- White papers
- Capacity of an IEEE 802.11b Wireless LAN Supporting VoIP
- This paper evaluates the capacity of an IEEE 802.11b network carrying voice calls in a wide range of scenarios, including varying delay constraints, channel conditions and voice call quality requirements. It considers both G.711 and G.729 voice encoding schemes and a range of voice packet sizes. The paper first presents...
- Tags: Voice Call, IEEE 802.11, VoIP, Capacity, Stanford University, Wireless Network, Wireless LANs, Wi-Fi, Wireless, Telecommunications
- White papers
- Symposium Helps Stanford University Broaden Its Curriculum
- Computer-based multimedia courses have always been a key component of Stanford University's Education Program for Gifted Youth EPGY. With students from more than 35 countries, one of EPGY's major goals is to use technology to provide a classroom experience via the Web. They're meeting that goal today with Centra Symposium,...
- Tags: Centra Symposium, Stanford University, Centra Software
- Case studies
- Stanford University Lowers Cost of PC Management With Microsoft Windows XP, Dell OpenManage, and Altiris Deployment Solution
- Stanford University's IT infrastructure is as diverse and dynamic as its students and faculty. Bristling with new ideas, Stanford professors and students make extraordinary demands on the university's IT staff by regularly evaluating a myriad of software applications. In an effort to reduce the high cost of managing thousands of...
- Tags: Dell Computer Corp., Stanford University, Microsoft Windows XP, PC-management, Microsoft Corp., Dell OpenManage, Altiris Inc., Tools & Techniques, Microsoft Windows, Management, Operating Systems, Software
- Case studies
- Space-Frequency Coded Broadband OFDM Systems
- Space-time coding for fading channels is a communication technique that realizes the diversity benefits of multiple transmit antennas. Previous work in this area has focused on the narrowband flat fading case where spatial diversity only in available. This paper investigates the use of space-coding in OFDM-based broadband systems where both...
- Tags: Stanford University, Broadband, OFDM, Broadband Internet, Network Technology, Telecommunications, Wireless, Networking
- White papers
- Opportunistic Measurement: Extracting Insight From Spurious Traffic
- While network measurement techniques are continually improving, representative network measurements are increasingly scarce. The issue is fundamentally one of access: either the points of interest are hidden, are unwilling, or are sufficiently much that representative analysis is daunting if not unattainable. In particular, much of the Internet's modern growth, in...
- Tags: Measurement, Network, Stanford University, Internet, Firewalls, Productivity, Networking
- White papers
- Landmark Selection and Greedy Landmark-Descent Routing for Sensor Networks
- This paper study the problem of landmark selection for landmark-based routing in a network of fixed wireless communication nodes. It present a distributed landmark selection algorithm that does not rely on global clock synchronization, and a companion local greedy landmark-based routing scheme. The paper assumes no node location information, and...
- Tags: Network, Stanford University, Sensor, Node, Wi-Fi, Wireless
- White papers 2008-01-01
- ABwE: A Practical Approach to Available Bandwidth Estimation
- This paper reports on a new tool developed for monitoring available bandwidth in the range from several Mbps to 1000 Mbps. The tool is based on the packet pair dispersion technique. It has been in experimental use at SLAC for several months and it has been demonstrated at iGrid2002 and...
- Tags: Stanford University, Monitoring, Mbps, Productivity
- White papers 2008-01-01
- Measuring End-to-End Bandwidth With Iperf Using Web100
- End-to-end bandwidth estimation tools like Iperf though fairly accurate are intrusive. This paper describes how with an instrumented TCP stack (Web100), one can estimate the end-to-end bandwidth accurately, while consuming significantly less network bandwidth and time. The paper modified Iperf to use Web100 to detect the end of slow-start and...
- Tags: Bandwidth, Network, Stanford University, Tcp/Ip, Networking
- White papers 2008-01-01
- Australian researcher finds a way to make broadband 100 times faster
- John Papandriopoulos, a research fellow at the University of Melbourne, has developed an algorithm that reduces interference in ADSL connections, essentially making broadband Net speeds 100 times faster. An excerpt from The Age: Most ADSL services are effectively limited to speeds between 1 Mbps to 20...
- Tags: Researcher, Stanford University, Broadband, Mbps, John, Broadband Internet, DSL, Network Technology, Engineering, Telecommunications, Personal Technology, Networking, Arun Radhakrishnan
- Blog posts 2007-11-05
- Analytical Evaluation and Automated Design of Networks-on-Chip
- As Systems-on-Chip SoC become more prevalent, and as computer architecture as a whole makes a shift to more modular and parallel designs, on-chip interconnection networks are seen more and more frequently,. As with all aspects of microprocessor design, as the problem size and design space grows, arriving at an efficient...
- Tags: Stanford University, Interconnection Network, Semiconductors, Productivity, Hardware
- White papers 2007-05-15
- Photos: Stanford passes first DARPA test
- The Stanford University racing team shows off its robot car, Junior, to DARPA representatives on in the first test round to enter the DARPA Grand Challenge.
- Tags: Robots, photograph, DARPA, Stanford, Stanford University, robot, team
- Image galleries 2007-06-14
