This paper focuses on quantized channel state information (CSI) feedback for downlink network MIMO systems. Specifically, we propose to quantize and feedback the CSI of a subset of BSs, namely the feedback set. Our analysis reveals the tradeoff between better interference mitigation with large feedback set and high CSI quantization precision with small feedback set. […]
Throughput Optimization in High Speed Downlink Packet Access (HSDPA)
In this paper, we investigate single user throughput optimization in High Speed Downlink Packet Access (HSDPA). Specifically, we propose offline and online optimization algorithms which adjust the Channel Quality Indicator (CQI) used by the network for scheduling of data transmission. In the offline algorithm, a given target block error rate (BLER) is achieved by adjusting […]
Network Coding Based Privacy Preservation against Traffic Analysis in Multi-hop Wireless Networks
Privacy threat is one of the critical issues in multi-hop wireless networks, where attacks such as traffic analysis and flow tracing can be easily launched by a malicious adversary due to the open wireless medium. Network coding has the potential to thwart these attacks since the coding/mixing operation is encouraged at intermediate nodes. However, the […]
The Awareness Network, To Whom Should I Display My Actions? And, Whose Actions Should I Monitor?
The concept of awareness plays a pivotal role in research in Computer-Supported Cooperative Work. Recently, software engineering researchers interested in the collaborative nature of software development have explored the implications of this concept in the design of software development tools. A critical aspect of awareness is the associated coordinative work practices of displaying and monitoring […]
Continuous Neighbor Discovery in Asynchronous Sensor Networks
In most sensor networks, the nodes are static. Nevertheless, node connectivity is subject to changes because of disruptions in wireless communication, transmission power changes, or loss of synchronization between neighboring nodes. Hence, even after a sensor is aware of its immediate neighbors, it must continuously maintain its view, a process we call continuous neighbor discovery. […]
Live Streaming with Receiver-based Peer-division Multiplexin
A number of commercial peer-to-peer (P2P) systems for live streaming have been introduced in recent years. The behavior of these popular systems has been extensively studied in several measurement papers. Due to the proprietary nature of these commercial systems, however, these studies have to rely on a “black-box”approach, where packet traces are collected from a […]
Data integrity proofs in cloud storage
Cloud computing has been envisioned as the de-facto solution to the rising storage costs of IT Enterprises. With the high costs of data storage devices as well as the rapid rate at which data is being generated it proves costly for enterprises or individual users to frequently update their hardware. Apart from reduction in storage […]
Exploiting Dynamic Resource Allocation for Efficient Parallel Data Processing in the Cloud
in recent years ad hoc parallel data processing has emerged to be one of the killer applications for Infrastructure-as-a-Service (IaaS) clouds. Major Cloud computing companies have started to integrate frameworks for parallel data processing in their product portfolio, making it easy for customers to access these services and to deploy their programs. However, the processing […]
Site-Based Partitioning and Repartitioning Techniques for Parallel PageRank Computation
The PageRank algorithm is an important component in effective web search. At the core of this algorithm are repeated sparse matrix-vector multiplications where the involved web matrices grow in parallel with the growth of the web and are stored in a distributed manner due to space limitations. Hence, the PageRank computation, which is frequently repeated, […]
FDAC: Toward Fine-Grained Distributed Data Access Control in Wireless Sensor Networks
Distributed sensor data storage and retrieval have gained increasing popularity in recent years for supporting various applications. While distributed architecture enjoys a more robust and fault-tolerant wireless sensor network (WSN), such architecture also poses a number of security challenges especially when applied in mission-critical applications such as battlefield and e-healthcare. First, as sensor data are […]
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