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University of California
(1028 results)-
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Degrees of Freedom of Wireless X Networks
November 19, 2007, 12:00am PST
The authors explore the degrees of freedom of M×N user wireless X networks, i.e. networks of M transmitters and N receivers where every transmitter has an independent message for every receiver....
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White Papers
Nonadaptive Mastermind Algorithms for String and Vector Databases, With Case Studies
December 14, 2010, 12:00am PST
In this paper, the authors study sparsity-exploiting Mastermind algorithms for attacking the privacy of an entire database of character strings or vectors, such as DNA strings, movie ratings, or...
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White Papers
A Deterministic Approach to Wireless Relay Networks
October 19, 2007, 12:00am PDT
The authors present a deterministic channel model which captures several key features of multiuser wireless communication. They consider a model for a wireless network with nodes connected by such...
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Wireless Network Information Flow
February 1, 2008, 12:00am PST
The authors present an achievable rate for general deterministic relay networks, with broadcasting at the transmitters and interference at the receivers. In particular they show that if the...
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White Papers
Financial Constraints And Innovation: Why Poor Countries Dont Catchup
June 1, 2010, 12:00am PDT
The authors examine micro-level channels of how financial development can affect macroeconomic outcomes like the level of income and export intensity. They investigate theoretically and...
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White Papers
The Equivalence of the Random Oracle Model and the Ideal Cipher Model, Revisited
November 8, 2010, 12:00am PST
The authors consider the cryptographic problem of constructing an invertible random permutation from a public random function (i.e., which can be accessed by the adversary). This goal is...
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White Papers
Cooperative Multiplexing in the Multiple Antenna Half Duplex Relay Channel
January 15, 2009, 12:00am PST
Cooperation between terminals has been proposed to improve the reliability and throughput of wireless communication. While recent work has shown that relay cooperation provides increased...
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White Papers
Automatic Analog Beamforming Transceiver for 60 GHz Radios
January 5, 2009, 12:00am PST
The demand for high speed wireless communication systems has made it necessary to move to millimeter wave frequencies. Device scaling in CMOS technologies has enabled low cost communications...
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White Papers
Efficient Implementation of Linear Programming Decoding
February 4, 2009, 12:00am PST
Linear Programming (LP) decoding, originally proposed by Feldman et al. as an approximation to the Maximum-Likelihood (ML) decoding of binary linear codes, solves a linear optimization problem...
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White Papers
Correlated Sources Over Broadcast Channels
December 22, 2009, 12:00am PST
The problem of reliable transmission of correlated sources over the broadcast channel, originally studied by Han and Costa, is revisited. An alternative characterization of their sufficient...
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White Papers
Correlated Resource Models of Internet End Hosts
November 25, 2010, 12:00am PST
Understanding and modelling resources of Internet end hosts is essential for the design of desktop software and Internet-distributed applications. In this paper the authors develop a correlated...
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White Papers
Distributed High Accuracy Peer-to-Peer Localization in Mobile Multipath Environments
November 28, 2010, 12:00am PST
In this paper the authors consider the problem of high accuracy localization of mobile nodes in a multipath-rich environment where sub-meter accuracies are required. They employ a peer to peer...
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White Papers
A Systematic Approach to Artificial Agents
February 19, 2009, 12:00am PST
Agents and agent systems are becoming more and more important in the development of a variety of fields such as ubiquitous computing, ambient intelligence, autonomous computing, intelligent...
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White Papers
Extended H-Index Parameterized Data Structures for Computing Dynamic Subgraph Statistics
September 3, 2010, 12:00am PDT
The authors present techniques for maintaining subgraph frequencies in a dynamic graph, using data structures that are parameterized in terms of h, the h-index of the graph. The methods extend...
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White Papers
On-Off Random Access Channels: A Compressed Sensing Framework
March 9, 2009, 12:00am PDT
In wireless systems, random access refers to any multiple access communication protocol where the users autonomously decide whether or not to transmit depending on their own traffic requirements...
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White Papers
Connectivity of Heterogeneous Wireless Networks
August 9, 2009, 12:00am PDT
The authors address the connectivity of large-scale ad hoc heterogeneous wireless networks, where secondary users exploit channels temporarily unused by primary users and the existence of a...
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White Papers
Throughput and Collision Analysis of Multi-Channel Multi-Stage Spectrum Sensing Algorithms
April 7, 2011, 12:00am PDT
Multi-stage sensing is a novel concept that refers to a general class of spectrum sensing algorithms that divide the sensing process into a number of sequential stages. The number of sensing...
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White Papers
Deterministic and Energy-Optimal Wireless Synchronization
October 7, 2010, 12:00am PDT
The authors consider the problem of clock synchronization in a wireless setting where processors must power-down their radios in order to save energy. In this setting, each processor has a radio...
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White Papers
Fractional Repetition Codes for Repair in Distributed Storage Systems
October 13, 2010, 12:00am PDT
The authors introduce a new class of exact Minimum-Bandwidth Regenerating (MBR) codes for distributed storage systems, characterized by a low-complexity uncoded repair process that can tolerate...
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White Papers
Dynamic Multi-Vehicle Routing With Multiple Classes of Demands
March 16, 2009, 12:00am PDT
In this paper the authors study a dynamic vehicle routing problem in which there are multiple vehicles and multiple classes of demands. Demands of each class arrive in the environment randomly...
Provided by University of California
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White Papers
Efficient Remote Profiling for Resource-Constrained Devices
January 1, 2011, 12:00am PST
The widespread use of ubiquitous, mobile, and continuously-connected computing agents has inspired software developers to change the way they test, debug, and optimize software. Users now play an...
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White Papers
Guiding Architectural SRAM Models
January 1, 2011, 12:00am PST
Caches, block memories, predictors, state tables, and other forms of on-chip memory are continuing to consume a greater portion of processor designs with each passing year. Making good...
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White Papers
Addressing the Challenges of Synchronization/Communication and Debugging Support in Hardware/Software Cosimulation
October 25, 2007, 12:00am PDT
With increasing adoption of Electronic System Level (ESL) tools, effective design and validation time has reduced to a considerable extent. Cosimulation is found to be a principal component of ESL...
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White Papers
Exploring the Processor and ISA Design for Wireless Sensor Network Applications
October 26, 2007, 12:00am PDT
Power consumption, physical size, and architecture design of sensor node processors have been the focus of sensor network research in the architecture community. What lies at the foundation for...
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White Papers
Whiteboards That Compute: A Workload Analysis
July 7, 2008, 12:00am PDT
A whiteboard that automatically identifies drawn strokes, interprets them in context, and augments drawn images with computational results, such as solutions to mathematical equations or results...
Provided by University of California
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White Papers
Managing Security in FPGA-Based Embedded Systems
December 31, 2008, 12:00am PST
FPGAs combine the programmability of processors with the performance of custom hardware. As they become more common in critical embedded systems, new techniques are necessary to manage security in...
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White Papers
A Small Cache of Large Ranges: Hardware Methods for Efficiently Searching, Storing, and Updating Big Dataflow Tags
September 5, 2008, 12:00am PDT
Dynamically tracking the flow of data within a microprocessor creates many new opportunities to detect and track malicious or erroneous behavior, but these schemes all rely on the ability to...
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White Papers
Enforcing Memory Policy Specifications in Reconfigurable Hardware
January 31, 2008, 12:00am PST
While general-purpose processor based systems are built to enforce memory protection to prevent the unintended sharing of data between processes, current systems built around reconfigurable...
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White Papers
Metric Based Multi-Timescale Control for Reducing Power in Embedded Systems
October 23, 2008, 12:00am PDT
Digital control for embedded systems often requires low-power, hard real-time computation to satisfy high control-loop bandwidth, low latency, and low-power requirements. In particular, the...
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White Papers
Quantifying the Potential of Program Analysis Peripherals
January 1, 2011, 12:00am PST
As programmers are asked to manage more complicated parallel machines, it is likely that they will become increasingly dependent on tools such as multi-threaded data race detectors, memory bounds...
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White Papers
Tracking Information Flow at the Gate-Level for Secure Architectures
December 18, 2009, 12:00am PST
Many critical systems require tight guarantees on the flow of information, for example when handling secret cryptographic keys or critical avionics data. Unfortunately, even understanding the true...
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White Papers
Guarded Resolution for Answer Set Programming
February 21, 2009, 12:00am PST
The authors investigate a proof system based on a guarded resolution rule and show its adequacy for stable semantics of normal logic programs. As a consequence, they show that Gelfond-Lifschitz...
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White Papers
Opportunistic Spatial Orthogonalization and Its Application in Fading Cognitive Radio Networks
April 28, 2009, 12:00am PDT
Opportunistic Spatial Orthogonalization (OSO) is a cognitive radio scheme that allows the existence of secondary users and hence increases the system throughput, even if the primary user occupies...
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White Papers
Evaluation of Marton's Inner Bound for the General Broadcast Channel
November 11, 2009, 12:00am PST
The best known inner bound on the two-receiver general broadcast channel without a common message is due to Marton. This result was subsequently generalized in to broadcast channels with a common...
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Degenerate 3D Tensors
January 1, 2011, 12:00am PST
Topological analysis of 3D tensor fields starts with the identification of degeneracies in the tensor field. In this paper, the authors present a new, intuitive and numerically stable method for...
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White Papers
An Efficient Dynamic and Distributed RSA Accumulator
May 8, 2009, 12:00am PDT
The authors show how to use the RSA one-way accumulator to realize an efficient and dynamic authenticated dictionary, where untrusted directories provide cryptographically verifiable answers to...
Provided by University of California
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White Papers
Improved Adaptive Group Testing Algorithms With Applications to Multiple Access Channels and Dead Sensor Diagnosis
May 12, 2009, 12:00am PDT
The authors study group-testing algorithms for resolving broadcast conflicts on a Multiple Access Channel (MAC) and for identifying the dead sensors in a mobile ad hoc wireless network. In...
Provided by University of California
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White Papers
Efficient Techniques for Privacy-Preserving Sharing of Sensitive Information
April 18, 2011, 12:00am PDT
The need for controlled (privacy-preserving) sharing of sensitive information occurs in many different and realistic everyday scenarios, ranging from national security to social networking. A...
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White Papers
Password-Protected Secret Sharing
November 3, 2010, 12:00am PDT
A user of computing technology, let's call her Alice, needs to store her valuable and private data, including texts, images, passwords, or cryptographic keys, on her personal device. Alice's...
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White Papers
Structural Solutions for Cross-Layer Optimization of Wireless Multimedia Transmission
May 23, 2009, 12:00am PDT
In this paper, the authors propose a systematic solution to the problem of cross-layer optimization for delay-sensitive media transmission over time-varying wireless channels as well as...
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White Papers
On the Efficiency and Complexity of Distributed Spectrum Allocation
June 3, 2007, 12:00am PDT
The authors study the efficiency and complexity of a distributed spectrum allocation algorithm using explicit user coordination. Users self-organize into coordination groups and adjust spectrum...
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White Papers
SPARTA: Stable and Efficient Spectrum Access in Next Generation Dynamic Spectrum Networks
January 17, 2008, 12:00am PST
Future wireless infrastructure networks will dynamically access spectrum for maximum utilization. However, the fundamental challenge is how to provide stable spectrum access required for most...
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White Papers
Understanding the Power of Distributed Coordination for Dynamic Spectrum Management
June 19, 2008, 12:00am PDT
This paper investigates a distributed and adaptive approach to manage spectrum usage in dynamic spectrum access networks. While previous works focus on centralized provisioning, the authors...
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White Papers
Traffic-Aware Dynamic Spectrum Access
October 22, 2008, 12:00am PDT
Demand-driven spectrum allocation can drastically improve performance for Wi-Fi access points struggling under increasing user demands. While their frequency agility makes cognitive radios ideal...
Provided by University of California
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White Papers
Preamble Design for Non-Contiguous Spectrum Usage in Cognitive Radio Networks
March 26, 2009, 12:00am PDT
Cognitive radios can significantly improve spectrum efficiency by using locally available spectrum. The efficiency, however, depends heavily on their transceiver design. In particular, being able...
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White Papers
Minimum-Energy Multicast Tree in Cognitive Radio Networks
September 1, 2009, 12:00am PDT
The authors address the multicast problem in cognitive radio networks, where secondary users exploit channels temporarily unused by primary users (i.e., spectrum opportunities). The existence of a...
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White Papers
Temporal Traffic Dynamics Improve the Connectivity of Ad Hoc Cognitive Radio Networks
January 23, 2011, 12:00am PST
In an ad hoc cognitive radio network, secondary users access channels temporarily unused by primary users and the existence of a communication link between two secondary users depends on the...
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White Papers
Dynamic Decentralized Multi-Channel MAC Protocols
December 20, 2007, 12:00am PST
In this paper, the authors propose new dynamic decentralized multi-channel Multiple ACcess (MAC) protocols and study their performance. Their protocols build on slotted Aloha, but extend it in...
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Energy Efficient Throughput Optimization in Multi-Hop Wireless Networks
January 13, 2010, 12:00am PST
Throughput, fairness, and energy consumption are often conflictly objectives in multi-hop wireless networks. In this paper, the authors propose the notion of lexicographical maxmin energy...
Provided by University of California
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White Papers
Mobile Device Theft Recovery Applicaiton
February 22, 2010, 12:00am PST
The constant access to information and computing resources brought by mobile devices had changed the nature of computing and communication experience. With more and more cell phones and laptops...
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White Papers
Power Guru: Implementing Smart Power Management on the Android Platform
February 23, 2010, 12:00am PST
Improving battery life in mobile devices has become a very important area of research. Other components like the CPU, has had some major upgrades while batteries? development has lacked the same...
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White Papers
IMOP: Improving Multicast Only Performance in Layer 2 Access Networks
February 22, 2010, 12:00am PST
One of multicast's greatest success stories to date has been service providers' deployment of IPTV. A common thread among IPTV solutions is an attempt to improve perception of channel changes for...
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White Papers
Analysis of Internet Usage in a Rural Wireless Network
February 23, 2010, 12:00am PST
There have been a number of rural wireless network proving Internet access operating since 2005. But little is known about how the Internet is being used on these networks and whether it follows...
Provided by University of California
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White Papers
Anycast Cloud Routing for Wireless Networks
February 23, 2010, 12:00am PST
The authors envision the present and future topologies of wireless networks to include complex hierarchies of infrastructured, and semi-infrastructured multihop networks using a variety of...
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White Papers
NEW: A Channel Management Strategy for IEEE 802.11n
February 23, 2010, 12:00am PST
IEEE 802.11n is a newly emerging wireless standard which, relative to former 802.11 protocols, such as 802.11a/b/g, has a number of new mechanisms that enable multi-fold increases in transmission...
Provided by University of California
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White Papers
Dynamic Channel Allocation in Wireless Ad-Hoc Networks
June 13, 2007, 12:00am PDT
With the explosion of 802.11 network deployments, there exist co-located wireless networks in many densely populated areas (such as residential buildings, complexes, etc). Deployment of a mesh...
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White Papers
Cooperative and Non-Cooperative Resource Sharing in Networks: A Delay Perspective
June 5, 2008, 12:00am PDT
From multi-description/multi-path routing for multi-media applications to content distribution in P2P networks, to community networking, many forms of resource sharing have been proposed to...
Provided by University of California
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White Papers
High-SNR Analysis of Outage-Limited Communications With Bursty and Delay-Limited Information
September 25, 2008, 12:00am PDT
This paper analyzes the high-SNR asymptotic error performance of outage-limited communications with fading, where the number of bits that arrive at the transmitter during any timeslot is random...
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Delay-Optimal Server Allocation in Multi-Queue Multi-Server Systems With Time-Varying Connectivities
January 23, 2009, 12:00am PST
This paper considers the problem of optimal server allocation in a time-slotted system with N statistically symmetric queues and K servers when the arrivals and channels are stochastic and...
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Linear-Feedback Sum-Capacity for Gaussian Multiple Access Channels
August 14, 2011, 12:00am PDT
The capacity region of the N-sender Gaussian multiple access channel with feedback is not known in general. This paper studies the class of linear-feedback codes that includes (non-linear)...
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Comparison: ASR is a Variant of ANODR
January 1, 2011, 12:00am PST
Recently, on-demand routing approach has been embraced by several anonymous routing schemes to protect Mobile Ad hoc NETworks (MANETs) from traffic analysts' attacks. ANODR is the first in...
Provided by University of California
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White Papers
Power Conservation and Quality of Surveillance in Target Tracking Sensor Networks
January 1, 2011, 12:00am PST
Target tracking is an important application of wireless sensor networks. In this application, the sensor nodes collectively monitor and track the movement of an event or target object. The network...
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White Papers
Evaluation of Traffic Data Obtained Via GPS-Enabled Mobile Phones: The Mobile Century Field Experiment
August 1, 2009, 12:00am PDT
The growing need of the driving public for accurate traffic information has spurred the deployment of large scale dedicated monitoring infrastructure systems, which mainly consist in the use of...
Provided by University of California
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White Papers
The Value of Wireless Internet Connection on Trains: Implications for Mode-Choice Models
January 10, 2008, 12:00am PST
Deployment of advanced technologies has enabled wireless internet access for commuters on various transportation modes. Such networked environments have enabled riders to engage in productive...
Provided by University of California
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White Papers
Frugal Routing on Wireless Ad-Hoc Networks
March 3, 2008, 12:00am PST
The authors study game-theoretic mechanisms for routing in ad-hoc networks. Game-theoretic mechanisms capture the non-cooperative and selfish behavior of nodes in a resource-constrained...
Provided by University of California
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White Papers
The Effect of Link Churn on Wireless Routing
August 29, 2008, 12:00am PDT
In this paper, the authors examine the spatiotemporal dynamics of wireless links and evaluate their effect on routing. They ran several experiments using a testbed consisting of 57 MicaZ motes,...
Provided by University of California
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White Papers
Good Neighbor: Secure Pairing of Nearby Wireless Devices by Multiple Antennas
December 7, 2010, 12:00am PST
The proliferation of personal wireless devices requires secure connection between them. While it is easy to securely pair electronic devices by wires, it is very challenging to pair them...
Provided by University of California
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White Papers
SenSearch: GPS and Witness Assisted Tracking for Delay Tolerant Sensor Networks
July 10, 2009, 12:00am PDT
This paper describes the design, implementation and performance evaluation of SenSearch, an outdoors, GPS assisted personnel tracking system using MICA motes. SenSearch is a mobile wireless ad-hoc...
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White Papers
Bank Competition And Economic Stability: The Role Of Monetary Policy
February 15, 2009, 12:00am PST
This paper analyzes the dual role of monetary policy for economic efficiency and stability in a model of endogenous bank competition. Multiple equilibria emerge from the complementarity between...
Provided by University of California
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White Papers
Heterogeneity-Aware Resource Allocation and Scheduling in the Cloud
May 20, 2011, 12:00am PDT
Data analytics are key applications running in the cloud computing environment. To improve performance and cost-effectiveness of a data analytics cluster in the cloud, the data analytics system...
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White Papers
The Effects Of Monetary Policy "News" And "Surprises"
May 1, 2011, 12:00am PDT
There is substantial agreement in the monetary policy literature over the effects of exogenous monetary policy shocks. The shocks that are investigated, however, almost exclusively represent...
Provided by University of California
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White Papers
Modeling and Characterizing User Experience in a Cloud Server Based Mobile Gaming Approach
August 13, 2009, 12:00am PDT
With the evolution of mobile devices and networks, and the growing trend of mobile Internet access, rich, multi-player gaming using mobile devices, similar to PC-based Internet games, has...
Provided by University of California
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White Papers
Financial Crises, Credit Booms, And External Imbalances: 140 Years Of Lessons
April 13, 2011, 12:00am PDT
Do external imbalances increase the risk of financial crises? In this paper, the authors study the experience of 14 developed countries over 140 years (1870{2008). They exploit their long-run...
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White Papers
Fuzzy Math, Disclosure Regulation And Credit Market Outcomes: Evidence From Truth-In-Lending Reform
June 1, 2009, 12:00am PDT
Consumer installment lenders prefer to market "Low monthly payments" and shroud interest rates. Why not voluntarily disclose rates? The authors show that when an interest rate is not disclosed,...
Provided by University of California
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White Papers
Security Investment (Failures) In Five Economic Environments: A Comparison Of Homogeneous And Heterogeneous User Agents
May 29, 2008, 12:00am PDT
Security interactions in networked systems, and the associated user choices, due to their complexity, are notoriously difficult to predict, and sometimes even harder to rationalize. The authors...
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White Papers
Illiquid Financial Markets And Monetary Policy
April 1, 2011, 12:00am PDT
This paper analyzes the role of money in markets where financial investment takes place in a decentralized fashion. A key methodological contribution is the development of a dynamic framework that...
Provided by University of California
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White Papers
Racial Exclusion And The Political Economy Of The Subprime Crisis
February 15, 2009, 12:00am PST
This paper develops a political economic explanation of the 2007-09 US subprime crisis which focuses on one of its central causes: the transformation of racial exclusion in US mortgage markets....
Provided by University of California
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From New Deal Institutions To Capital Markets: Commercial Consumer Risk Scores And The Making Of Subprime Mortgage Finance
February 9, 2009, 12:00am PST
At the tail end of 2006, the 'Subprime' hit the news with a bang when default rates shot up in a segment of mortgage finance that had previously received little attention in mainstream reporting....
Provided by University of California
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White Papers
Vintage Capital Growth Theory: Three Breakthroughs
June 1, 2011, 12:00am PDT
Vintage capital growth models have been at the heart of growth theory in the 60s. This research line collapsed in the late 60s with the so-called embodiment controversy and the technical...
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White Papers
Understanding West German Economic Growth In The 1950s
November 18, 2008, 12:00am PST
The authors evaluate explanations for why Germany grew so quickly in the 1950s. The recent literature has emphasized convergence, structural change and institutional shake-up while minimizing the...
Provided by University of California
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