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University of California at Berkeley (10 results), University of California at Los Angeles (9 results)
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- Allowing Errors in Speech Over Wireless LANs
- Wireless LANs are becoming commonplace because of their ease in providing mobile communication. As use of IEEE 802.11 continues to expand, support for voice will become a desirable feature. Supporting voice conversations over a packet network is more challenging than over current circuit switched wired networks. These challenges are particularly...
- White papers
- Model Checking an Entire Linux Distribution for Security Violations
- Software model checking has become a popular tool for verifying programs' behavior. Recent results suggest that it is viable for finding and eradicating security bugs quickly. However, even state-of-the-art model checkers are limited in use when they report an overwhelming number of false positives, or when their lengthy running time...
- White papers
- Unsupervised Learning With Permuted Data
- The authors consider the problem of unsupervised learning from a matrix of data vectors where in each row the observed values are randomly permuted in an unknown fashion. Such problems arise naturally in areas such as computer vision and text modeling where measurements need not be in correspondence with the...
- White papers
- Subspace-Based Channel Estimation for CDMA Downlink With Aperiodic Spreading Codes and Multiple Subchannels
- This paper considers a downlink CDMA system with aperiodic spreading codes and multipath propagation. Assisted by either multiple antennas or oversampling, multiple subchannels are created. Then subspace technique can be directly applied to estimate all channel parameters, based only on the channel output. The proposed method does not require either...
- White papers
- Performance of a Low-Complexity Downlink Channel Estimator for Long-Code CDMA Systems
- Recently, a blind downlink channel estimator is proposed for long-code CDMA systems based on a covariance matching idea. By modeling long spreading codes as random codes and pre-computing some code-dependent quantities, the algorithm shows extremely low complexity. Due to inaccuracy of estimated data covariance from finite number of received data...
- White papers
- Linear Multiuser Detection for Uplink Long-Code CDMA Systems
- In the uplink of a long-code CDMA system, base station knows spreading codes of all serviced users. Given propagation delays, code-decorrelation can be performed to separate users' inputs in each symbol interval even in a multipath environment. To detect information symbols, first the subspace technique is applied to estimate multipath...
- White papers
- Blind Detection of CDMA Signals Based on Kalman Filter
- This paper studies detection of CDMA signals based on Kalman filter. In the absence of both training symbols and the knowledge about multipath channel parameters, the system can be exactly fit into the Kalman model. By defining combination of channel and transmitted signals as state variables, the state transition matrix...
- White papers
- Temporal Diversity Assisted Blind Channel Estimation for Downlink Long-Code CDMA Systems
- In CDMA downlink, subspace channel estimation can not be applied directly since long spreading codes destroy the rank condition of the received data covariance matrix. However, after introducing temporal diversity in the transmitted chip sequence for all users, subspace technique can be applied to estimate channel. Detection of the desired...
- White papers
- Performance of Channel Estimation Assisted Linear Multiuser Receivers for Downlink CDMA Systems With Long Spreading Codes
- With availability of spatial/temporal diversity in the downlink of long code CDMA systems, subspace technique has been shown to be able to estimate channel parameters. Based on the estimated channel, the authors construct three typical linear receivers as ZF, MMSE and RAKE receivers. Due to channel estimation error, those receivers...
- White papers
- Evolution of the Remote Collaboration Tool: A Continuing Process
- Over the past six years, the authors have been developing a tool that can be used to enhance collaboration between persons who are not co-located in time and/or space. The package, now named Remote Collaboration Tool, was originally designed to enhance online learning. It has been used to augment learning...
- White papers
- Static Checking of Dynamically Generated Queries in Database Applications
- Many data-intensive applications dynamically construct queries in response to client requests and execute them. Java servlets, e.g., can create string representations of SQL queries and then send the queries, using JDBC, to a database server for execution. The servlet programmer enjoys static checking via Java's strong type system. However, the...
- White papers
- Accuracy Characterization for Metropolitan-Scale Wi-Fi Localization
- Location systems have long been identified as an important component of emerging mobile applications. Most research on location systems has focused on precise location in indoor environments. However, many location applications (for example, location-aware web search) become interesting only when the underlying location system is available ubiquitously and is not...
- White papers
- Efficient Cooperative Scheduling in 802.11 Wireless Networks
- The proliferation of 802.11a/b/g based wireless devices has fueled their adoption in many domains - some of which were unforeseen. Yet, these devices lack native support for many advanced features (such as service differentiation, etc.) required in specific application domains. A subset of these features relies on cooperative scheduling whereby...
- White papers
- A Priority-Based Distributed Call Admission Protocol for Multi-Hop Wireless Ad Hoc Networks
- Ad hoc networks have been proposed for a variety of applications where support for real time, multimedia services may be necessary. This requires that the network is able to offer service differentiation and Quality of Service QoS appropriate for the latency and jitter bounds needed to meet the real time...
- White papers
- Multimedia Communication Over OFDM Mobile Wireless Networks: A Cross-Layer Diversity Approach
- Diversity can be used to combat multipath fading and improve the performance of mobile wireless multimedia communication systems. In this work, by considering transmission of an embedded bitstream over a slow varying Rayleigh faded environment, the authors develop a cross-layer diversity technique which takes advantage of both multiple description source...
- White papers
- 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...
- White papers
- Model-Based Resource Prediction for Multi-Hop Wireless Networks
- Ad hoc networks have been proposed for a variety of applications where support for real time, multimedia services may be necessary. This requires that the network is able to offer Quality of Service QoS appropriate for the latency and throughput bounds needed to meet the real time constraint. An important...
- White papers
- Search-Quality Tradeoffs for Routing in Non-Ideal Wireless Networks
- Typical wireless routing protocols like AODV/DSR are not scalable to very large networks because they employ flooding for route discovery. Geographic routing protocols like GPSR are highly scalable because they require minimum control overhead, but depend on idealized link quality models such as the unit disk model which are not...
- White papers
- A Study of Dynamic Addressing Techniques in Mobile Ad Hoc Networks
- Dynamic address assignment enables nodes in mobile ad hoc networks to obtain a routable address without the need for any explicit configuration. It provides a means for nodes to communicate without any centralized infrastructure, and provides a mechanism for dynamic network membership. Recently, a considerable number of dynamic addressing protocols...
- White papers
- An Anonymous on Demand Routing Protocol With Untraceable Routes for Mobile Ad-Hoc Networks
- In hostile environments, the enemy can launch traffic analysis against interceptable routing information embedded in routing messages and data packets. Allowing adversaries to trace network routes and infer the motion pattern of nodes at the end of those routes may pose a serious threat to covert operations. This paper proposes...
- White papers
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