Hong Kong University of Science and Technology

Displaying 1-40 of 82 results

  • White Papers // Jan 2014

    HadoopWatch: A First Step Towards Comprehensive Traffic Forecasting in Cloud Computing

    In this paper, the authors present their effort towards comprehensive traffic forecasting for big data applications using external, light-weighted file system monitoring. Their idea is motivated by the key observations that rich traffic demand information already exists in the log and meta-data files of many big data applications, and that...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Sep 2013

    VOLUME: Enable Large-Scale In-Memory Computation on Commodity Clusters

    Traditional cloud computing technologies, such as MapReduce, use file systems as the system-wide substrate for data storage and sharing. A distributed file system provides a global name space and stores data persistently, but it also introduces significant overhead. Several recent systems use DRAM to store data and tremendously improve the...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Aug 2013

    IS-LABEL: an Independent-Set based Labeling Scheme for Point-to-Point Distance Querying

    Computing the shortest path or distance between two vertices is a basic operation in processing graph data. The importance of the operation is not only because of its role as a key building blocks in many algorithms but also of its numerous applications itself. In addition to applications in transportation,...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Aug 2013

    A Synergy of the Wireless Sensor Network and the Data Center System

    In recent years, data centers have emerged to be an increasingly important computing infrastructure. It is shown that wireless sensor networks (sensornets) can provide fine-grained measurements in data centers, and achieve better control of the data center platform for energy efficiency. However, the usage of sensornets has so far been...

    Provided By Hong Kong University of Science and Technology

  • White Papers // May 2013

    Information Technology in Innovation Activity of the Firm: Theory and Synthesis

    In light of Information Technology (IT) increasingly leading to enterprise transformation in contemporary firms, the authors aim to build a theory of IT-enabled capabilities in innovation activity of the firm. For so doing, they extensively review almost five hundred innovation studies in organization and IS literature and conduct a thematic...

    Provided By Hong Kong University of Science and Technology

  • White Papers // May 2013

    Dynamic Adjustment of Information Technology, Corporate Governance, and Firm Profitability

    How do managers make their decisions with regard to adjustment and deployment of Information Technology (IT) over time? Motivated by this complex dynamics, the authors draw on behavioral theory of the firm and theorize a bounded rational process of managerial decision making for IT investment. In particular, they explain the...

    Provided By Hong Kong University of Science and Technology

  • White Papers // May 2013

    The Penrose Effect in Resource Investment for Innovation: Evidence From Information Technology and Human Capital

    Resource-based theory views the firm as a bundle of resources administrated and coordinated by managers. The authors introduce the theoretical lens of Penrose effect to IS research, which refers to the fact that finite managerial capacities will suffer if the complexity of resource coordination is high. Therefore, although investment in...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Mar 2013

    K Means of Cloud Computing: MapReduce, DVM, and Windows Azure

    Cloud-based systems and the datacenter computing environment present a series of challenges to system designers for supporting massively concurrent computation on clusters with commodity hardware. The platform software should abstract the unreliable but highly provisioned hardware to provide a high-performance platform for a diversity of concurrent programs processing potentially very...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Nov 2012

    A Game Formulation of Duopoly Market With Coexistence of SoftSim and Regular Users

    The stable subscription relationships between users and Wireless Service Providers (WSPs) are established on the long-term service contracts and SIM (Subscriber Identity Module) cards. However, Apple's "SoftSim" plan will break the subscription relationships. With SoftSim devices, users can flexibly switch WSPs at fine time scales, which provides more choices to...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Nov 2012

    Exploring Frequency Diversity With Interference Alignment in Cognitive Radio Networks

    The available spectrum in cognitive radio networks is usually discontinuous but wide, which provides abundant frequency domain diversity. In this paper, the authors identify the opportunity of leveraging the newly-emerged technique interference alignment to exploit such diversity to support concurrent transmission and improve the network throughput in secondary networks. To...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Nov 2012

    FlatNet: Towards a Flatter Data Center Network

    The design of the data center network that interconnects the massive number of servers is very important to ensure the agility and robustness of the data center to meet the requirements of the applications. In response to this challenge, the research community have begun exploring novel interconnect topologies including FatTree,...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Nov 2012

    Progressive Caching in CCN

    The current Internet is based on the old concept of data networking whose role was to mainly build a fault-tolerant network infrastructure that enables efficient sharing of scarce and expensive resources such as storage and CPU time. Its main feature is the end-to-end principle of communication between any pair of...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Nov 2012

    Thermal Analysis for 3D Optical Network-on-Chip Based on a Novel Low-Cost 6x6 Optical Router

    As an emerging communication architecture for new generation multiprocessor systems, Optical Network-on-Chips (ONoCs) can potentially offer ultra-high communication bandwidth and high energy efficiency. Recent developments in nanoscale silicon photonic devices substantially improve the feasibility of ONoCs. However, as an intrinsic characteristic of photonic devices, thermal sensitivity is a potential issue...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Nov 2012

    Discovering a Large Scale Internet Topology : Complementary and Contrast View

    The Chinese Internet, hosting the world's largest population of Internet users, has largely remained as a black box due to the lack of large-scale measurement infrastructure and various other factors. In this paper, the authors characterize the Chinese Internet AS topology using measurements from both data and control planes. Their...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Oct 2012

    BEST: A Bidirectional Efficiency-Privacy Transferable Authentication Protocol for RFID-Enabled Supply Chain

    Radio Frequency IDentification (RFID) technique is gaining increasing popularity in supply chain for the product management. By attaching a tag to each product, a reader can employ an authentication protocol to interrogate the tag's information for verification, which facilitates the automatic processing and monitoring of products in many applications. However,...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Sep 2012

    Holistic Comparison of Optical Routers for Chip Multiprocessors

    Network-on-Chip (NoC) can improve the performance, power efficiency, and scalability of Chip Multi-Processors (CMPs). However, traditional NoCs using metallic interconnects consume a significant amount of power to deliver high communication bandwidth required in the near future. Optical NoCs are based on CMOS-compatible optical waveguides and optical routers, and promise significant...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Aug 2012

    A Virtual Machine Consolidation Framework for MapReduce Enabled Computing Clouds

    In now-a-days computing clouds, it is of the cloud providers' economic interests to correctly consolidate the workload of the Virtual Machines (VMs) into the suitable physical servers in the cloud data center in order to minimize the total maintenance cost. However, during the consolidation process, sufficient protection should be provided...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Aug 2012

    Airlift: Video Conferencing as a Cloud Service Using Inter-Datacenter Networks

    It is typical for enterprises to rely on services from cloud providers in order to build a scalable platform with abundant available resources to satisfy user demand, and for cloud providers to deploy a number of datacenters interconnected with high-capacity links, across different geographical regions. In this paper, the authors...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Jul 2012

    Rethinking the Architecture Design of Data Center Networks

    In the rising tide of the Internet of things, more and more things in the world are connected to the Internet. Recently, data has kept growing at a rate more than four times of that expected in Moore's law. This explosion of data comes from various sources such as mobile...

    Provided By Hong Kong University of Science and Technology

  • White Papers // May 2012

    A Novel Low-Waveguide-Crossing Floorplan for Fat Tree Based Optical Networks-on-Chip

    Optical Network-on-Chip (ONoC) can be used as the communication backbone for high performance Chip Multi-Processors (CMPs). Fat tree based ONoC shows high throughput, small delay and low power consumption. However, the traditional floorplan design of fat tree based ONoC has a large number of waveguide crossings because of the fat...

    Provided By Hong Kong University of Science and Technology

  • White Papers // May 2012

    Linear MIMO Transceiver Design for Cellular Multi-User Two-Way AF Relaying

    In this paper, the authors consider linear MIMO transceiver design for a cellular two-way amplify-and-forward relaying system consisting of a single multi-antenna base station, a single multi-antenna relay station, and multiple multi-antenna Mobile Stations (MSs). Due to the two-way transmission, the MSs could suffer from tremendous multi-user interference. They apply...

    Provided By Hong Kong University of Science and Technology

  • White Papers // May 2012

    Joint Optimization of Content Replication and Server Selection for Video-on-Demand

    The authors study providing large-scale Video-on-Demand (VoD) service to distributed users. In order to achieve scalability in user capacity and reduce the load of the core network, local servers with heterogeneous storage are deployed. Each server replicates the movie segments depending on their access probabilities. Considering the realistic scenario that...

    Provided By Hong Kong University of Science and Technology

  • White Papers // May 2012

    Hyper-BCube: A Scalable Data Center Network

    Mega data centers are being built around the world to provide various cloud computing services. As a result, data center networking has recently been a hot research topic in both academia and industry. A fundamental challenge in this research is the design of the data center network that interconnects the...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Apr 2012

    Achieving High-Bitrate Overlay Live Streaming With Proxy Helpers

    Meeting a high bitrate requirement (say, 1 Mbps) in overlay live streaming is challenging. The authors consider the design and optimization of an overlay network formed by distributed proxies for high-bitrate live streaming. The video stream is divided into sub-streams and pushed via multiple trees to all the proxy servers...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Mar 2012

    Use Your Frequency Wisely: Explore Frequency Domain for Channel Contention and ACK

    The promise of high speed (over 1Gbps) wireless transmission rate at the physical layer can be significantly compromised with the current design of 802.11 DCF. There are three overheads in the 802.11 MAC that contribute to the performance degradation: DIFS, random backoff and ACK. Motivated by the recent progress in...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Feb 2012

    Towards Energy-Fairness in Asynchronous Duty-Cycling Sensor Networks

    In this paper, the authors investigate the problem of controlling node sleep intervals so as to achieve the min-max energy fairness in asynchronous duty-cycling sensor networks. They propose a mathematical model to describe the energy efficiency of such networks and observe that traditional sleep interval setting strategy, i.e., operating sensor...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Jan 2012

    Collaborative Hierarchical Caching With Dynamic Request Routing for Massive Content Distribution

    Massive content delivery in metropolitan networks has recently gained much attention with the successful deployment of commercial systems and an increasing user popularity. With an enormous volume of content available in the network, as well as the growing size of content owing to the popularity of high-definition video, the exploration...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Jan 2012

    Rise and Fall of the Peer-to-Peer Empire

    The essence of the peer-to-peer design philosophy is to design protocols for end hosts, or "Peers," to work in collaboration to achieve a certain design objective, such as the sharing of a large file. From a theoretical perspective, it has been recognized that the peer-to-peer design paradigm resembles gossip protocols,...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Jan 2012

    Spectrum Trading with Insurance in Cognitive Radio Networks

    Market based spectrum trading has been extensively studied to realize efficient spectrum utilization in Cognitive Radio Networks (CRNs). In this paper, the authors utilize the concept of insurance in spectrum trading so as to improve spectrum efficiency in CRNs. They show that by additionally purchasing a specifically designed insurance contract...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Oct 2011

    A Survey on Delay-Aware Resource Control for Wireless Systems - Large Deviation Theory, Stochastic Lyapunov Drift and Distributed Stochastic Learning

    In this paper, a comprehensive survey is given on several major systematic approaches in dealing with delay-aware control problems, namely the equivalent rate constraint approach, the Lyapunov stability drift approach and the approximate Markov Decision Process (MDP) approach using stochastic learning. These approaches essentially embrace most of the existing literature...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Oct 2011

    Interference Alignment Algorithm for Quasi-Static MIMO Cellular System

    In this paper, the authors propose an iterative Interference Alignment (IA) algorithm for quasi-static MIMO cellular networks. Such networks impose a key technical challenge in the IA algorithm design, namely the overlapping between the direct and interfering links due to the cellular topology. They shall address this challenge and propose...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Sep 2011

    Secure Multiplex Coding Over Interference Channel with Confidential Messages

    In this paper, inner and outer bounds on the capacity region of two-user interference channels with two confidential messages have been proposed. By adding secure multiplex coding to the error correction method, which achieves the best achievable capacity region for interference channel up to now, the authors have shown that...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Jun 2011

    Localized or Interleaved? a Tradeoff Between Diversity and CFO Interference in Multipath Channels

    Carrier Frequency Offset (CFO) damages the orthogonality between sub-carriers and thus causes multiuser interference in uplink OFDMA/SC-FDMA systems. For a given CFO, such multiuser interference is mainly dictated by channel (sub-carrier) allocation, which also specifies the diversity gain of one user over multi-path channels. In particular, the positions of one...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Jun 2011

    Fundamental Relationship Between Node Density and Delay in Wireless Networks with Unreliable Links

    Wireless communication sees an explosive growth in the number of customers in the past few decades, making Large-scale wireless network an important part of modern life. The authors investigate the fundamental relationship between node density and transmission delay in Large-scale wireless networks with unreliable links from percolation perspective. Previous works...

    Provided By Hong Kong University of Science and Technology

  • White Papers // May 2011

    Spatial Intercell Interference Cancellation With CSI Training and Feedback

    The authors investigate Inter-Cell Interference Cancellation (ICIC) with a practical downlink training and uplink Channel State Information (CSI) feedback model. The average downlink throughput for such a 2-cell network is derived. The user location has a strong effect on the Signal-to-Interference Ratio (SIR) and the channel estimation error. This motivates...

    Provided By Hong Kong University of Science and Technology

  • White Papers // May 2011

    Real Effects Of Money Growth And Optimal Rate Of Inflation In A Cash-In-Advance Economy With Labor-Market Frictions

    This paper studies the consequences of labor market frictions for the real effects of steady inflation in a monetary economy where cash is required for households' consumption purchases and firms' wage payments. It allows for labor market frictions in the sense that vacancy creation and job search are costly and...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Jan 2011

    Volatility, Growth, And Welfare

    This paper constructs an endogenous growth model driven by self-fulfilling expectation shocks to explain the stylized fact that the average growth rate of GDP is related negatively to volatility and positively to capacity utilization. The implied welfare gain from further stabilizing the U.S. economy is about a quarter of annual...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Dec 2010

    An Empirical Study of Long-Lived Code Clones

    Previous research has shown that refactoring code clones as soon as they are formed or discovered is not always feasible or worthwhile to perform, since some clones never change during evolution and some disappear in a short amount of time, while some undergo repetitive similar edits over their long lifetime....

    Provided By Hong Kong University of Science and Technology

  • White Papers // Dec 2010

    Queue-Aware Dynamic Clustering and Power Allocation for Network MIMO Systems Via Distributive Stochastic Learning

    In this paper, the authors propose a two-timescale delay-optimal dynamic clustering and power allocation design for downlink network MIMO systems. The dynamic clustering control is adaptive to the Global Queue State Information (GQSI) only and computed at the Base Station Controller (BSC) over a longer time scale. On the other...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Dec 2010

    Stochastic Control of Event-Driven Feedback in Multi-Antenna Interference Channels

    Spatial interference avoidance is a simple and effective way of mitigating interference in multi-antenna wireless networks. The deployment of this technique requires Channel-State Information (CSI) feedback from each receiver to all interferers, resulting in substantial network overhead. To address this issue, this paper proposes the method of distributive feedback control...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Aug 2013

    IS-LABEL: an Independent-Set based Labeling Scheme for Point-to-Point Distance Querying

    Computing the shortest path or distance between two vertices is a basic operation in processing graph data. The importance of the operation is not only because of its role as a key building blocks in many algorithms but also of its numerous applications itself. In addition to applications in transportation,...

    Provided By Hong Kong University of Science and Technology

  • White Papers // May 2010

    UNION: A Unified Inter/Intra-Chip Optical Network for Chip Multiprocessors

    As modern computing systems become increasingly complex, communication efficiency among and inside chips has become as important as the computation speeds of individual processor cores. Traditionally, inter-chip and intra-chip communication architectures are separately designed to maximize design flexibility under different constraints. However, jointly designing communication architectures for both inter-chip and...

    Provided By Hong Kong University of Science and Technology

  • White Papers // May 2012

    A Novel Low-Waveguide-Crossing Floorplan for Fat Tree Based Optical Networks-on-Chip

    Optical Network-on-Chip (ONoC) can be used as the communication backbone for high performance Chip Multi-Processors (CMPs). Fat tree based ONoC shows high throughput, small delay and low power consumption. However, the traditional floorplan design of fat tree based ONoC has a large number of waveguide crossings because of the fat...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Sep 2012

    Holistic Comparison of Optical Routers for Chip Multiprocessors

    Network-on-Chip (NoC) can improve the performance, power efficiency, and scalability of Chip Multi-Processors (CMPs). However, traditional NoCs using metallic interconnects consume a significant amount of power to deliver high communication bandwidth required in the near future. Optical NoCs are based on CMOS-compatible optical waveguides and optical routers, and promise significant...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Nov 2012

    Thermal Analysis for 3D Optical Network-on-Chip Based on a Novel Low-Cost 6x6 Optical Router

    As an emerging communication architecture for new generation multiprocessor systems, Optical Network-on-Chips (ONoCs) can potentially offer ultra-high communication bandwidth and high energy efficiency. Recent developments in nanoscale silicon photonic devices substantially improve the feasibility of ONoCs. However, as an intrinsic characteristic of photonic devices, thermal sensitivity is a potential issue...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Aug 2013

    A Synergy of the Wireless Sensor Network and the Data Center System

    In recent years, data centers have emerged to be an increasingly important computing infrastructure. It is shown that wireless sensor networks (sensornets) can provide fine-grained measurements in data centers, and achieve better control of the data center platform for energy efficiency. However, the usage of sensornets has so far been...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Sep 2013

    VOLUME: Enable Large-Scale In-Memory Computation on Commodity Clusters

    Traditional cloud computing technologies, such as MapReduce, use file systems as the system-wide substrate for data storage and sharing. A distributed file system provides a global name space and stores data persistently, but it also introduces significant overhead. Several recent systems use DRAM to store data and tremendously improve the...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Mar 2013

    K Means of Cloud Computing: MapReduce, DVM, and Windows Azure

    Cloud-based systems and the datacenter computing environment present a series of challenges to system designers for supporting massively concurrent computation on clusters with commodity hardware. The platform software should abstract the unreliable but highly provisioned hardware to provide a high-performance platform for a diversity of concurrent programs processing potentially very...

    Provided By Hong Kong University of Science and Technology

  • White Papers // May 2013

    Information Technology in Innovation Activity of the Firm: Theory and Synthesis

    In light of Information Technology (IT) increasingly leading to enterprise transformation in contemporary firms, the authors aim to build a theory of IT-enabled capabilities in innovation activity of the firm. For so doing, they extensively review almost five hundred innovation studies in organization and IS literature and conduct a thematic...

    Provided By Hong Kong University of Science and Technology

  • White Papers // May 2013

    Dynamic Adjustment of Information Technology, Corporate Governance, and Firm Profitability

    How do managers make their decisions with regard to adjustment and deployment of Information Technology (IT) over time? Motivated by this complex dynamics, the authors draw on behavioral theory of the firm and theorize a bounded rational process of managerial decision making for IT investment. In particular, they explain the...

    Provided By Hong Kong University of Science and Technology

  • White Papers // May 2013

    The Penrose Effect in Resource Investment for Innovation: Evidence From Information Technology and Human Capital

    Resource-based theory views the firm as a bundle of resources administrated and coordinated by managers. The authors introduce the theoretical lens of Penrose effect to IS research, which refers to the fact that finite managerial capacities will suffer if the complexity of resource coordination is high. Therefore, although investment in...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Aug 2012

    A Virtual Machine Consolidation Framework for MapReduce Enabled Computing Clouds

    In now-a-days computing clouds, it is of the cloud providers' economic interests to correctly consolidate the workload of the Virtual Machines (VMs) into the suitable physical servers in the cloud data center in order to minimize the total maintenance cost. However, during the consolidation process, sufficient protection should be provided...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Sep 2010

    A Low-Power Fat Tree-Based Optical Network-on-Chip for Multiprocessor System-on-Chip

    Multi-Processor System-on-Chip (MPSoC) is an attractive platform for high-performance applications. Network-on-Chips (NoCs) can improve the on-chip communication bandwidth of MPSoCs. However, traditional metallic interconnects consume significant amount of power to deliver even higher communication bandwidth required in the near future. Optical NoCs are based on CMOS-compatible optical waveguides and microresonators,...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Apr 2009

    Joint Optimization of Power Saving Mechanism in the IEEE 802.16e Mobile WiMAX

    The IEEE 802.16e mobile WiMAX technology aims to provide with an energy efficient communication platform for various mobile applications. In the standard, the sleep mode feature with three Power Saving Classes (PSCs) is designed to compensate for the power saving as the target. Prior work has shown that the proposed...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Feb 2009

    Examining User Acceptance of SMS: An Empirical Study in China and Hong Kong

    Short Message Service (SMS) has become an integral part of people's lives. It is one of the most popular services for mobile communications. This paper examines the determinants of user intention to use SMS. The authors proposed and empirically tested a model with seven main determinants of user acceptance and...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Jan 2010

    XR-Tree: Indexing XML Data for Efficient Structural Joins

    XML documents are typically queried with a combination of value search and structure search. While querying by values can leverage traditional database technologies, evaluating structural relationship, specifically parent-child or ancestor-descendant relationship, between XML element sets has imposed a great challenge on efficient XML query processing. This paper proposes XR-tree, namely,...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Dec 2008

    Externalizing Java Server Concurrency With CAL

    One of the most important decisions about the architecture of a server program is its concurrency mechanisms. However, a good concurrency model for general-purpose server programs is increasingly difficult to conceive as the runtime conditions are hard to predict. This paper advocates that the concurrency code is to be decoupled...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Apr 2010

    QoS-Revenue Tradeoff With Time-Constrained ISP Pricing

    Usage-based pricing has been recognized as a network congestion management tool. Internet Service Providers (ISPs), however, have limited ability to set time-adaptive usage-price to manage congestion arising from time-varying consumer utility for data. To achieve the maximum revenue, ISP can set its time-invariant usage-price low enough to aggressively encourage consumer's...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Mar 2009

    Statistical Eigenmode Transmission Over Jointly-Correlated MIMO Channels

    The authors investigate MIMO eigenmode transmission using statistical channel state information at the transmitter. They consider a general jointly-correlated MIMO channel model, which does not require separable spatial correlations at the transmitter and receiver. For this model, they first derive a closed-form tight upper bound for the ergodic capacity, which...

    Provided By Hong Kong University of Science and Technology

  • White Papers // May 2009

    Optimal Sparse CDMA Detection at High Load

    Balancing efficiency of bandwidth use and complexity of detection involves choosing a suitable load for a multi-access channel. In the case of synchronous CDMA, with random codes, it is possible to demonstrate the existence of a threshold in the load beyond which there is an apparent jump in computational complexity....

    Provided By Hong Kong University of Science and Technology

  • White Papers // Jun 2009

    Delay-Optimal Power and Precoder Adaptation for Multi-Stream MIMO Systems

    Multiple Input Multiple Output (MIMO) communication is well-known to boost the wireless spectral efficiency through spatial multiplexing. Substantial performance gain could be obtained by power and precoder adaptation according to the channel state information is available at the transmitter (CSIT). In a linear MIMO precoder design framework is proposed to...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Nov 2010

    Reducing Handover Delay by Preselective Scanning Using GPS

    IEEE 802.11 based mobile communication towers is used very much in many personal and industrial purposes as it provides a continuous connectivity to Mobile Nodes (MNs) and allows them to change their attachment point from old Access Point (A)P to new AP while needed. But one main problem of continuous...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Aug 2009

    A Low-Overhead Energy Detection Based Cooperative Sensing Protocol for Cognitive Radio Systems

    Cognitive radio and dynamic spectrum access represent a new paradigm shift in more effective use of limited radio spectrum. One core component behind dynamic spectrum access is the sensing of primary user activity in the shared spectrum. Conventional distributed sensing and centralized decision framework involving multiple sensor nodes is proposed...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Dec 2010

    Queue-Aware Dynamic Clustering and Power Allocation for Network MIMO Systems Via Distributive Stochastic Learning

    In this paper, the authors propose a two-timescale delay-optimal dynamic clustering and power allocation design for downlink network MIMO systems. The dynamic clustering control is adaptive to the Global Queue State Information (GQSI) only and computed at the Base Station Controller (BSC) over a longer time scale. On the other...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Dec 2010

    Stochastic Control of Event-Driven Feedback in Multi-Antenna Interference Channels

    Spatial interference avoidance is a simple and effective way of mitigating interference in multi-antenna wireless networks. The deployment of this technique requires Channel-State Information (CSI) feedback from each receiver to all interferers, resulting in substantial network overhead. To address this issue, this paper proposes the method of distributive feedback control...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Jun 2009

    Resource Optimisation in a Wireless Sensor Network With Guaranteed Estimator Performance

    New control paradigms are needed for large networks of wireless sensors and actuators in order to efficiently utilise system resources. In this paper, the authors consider the problem of discrete-time state estimation over a wireless sensor network. Given a tree that represents the sensor communications with the fusion centre, the...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Mar 2009

    Information Technology in Supply Chains: The Value of IT-Enabled Resources Under Competition

    In this paper, the authors seek to better understand the value of Information Technology (IT) in supply chain contexts. Grounded in the resource-based theory in conjunction with transaction cost economics, they develop a conceptual model that links three IT-related resources (backend integration, managerial skills, and partner support) to firm performance...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Dec 2008

    FlexSync: An Aspect-Oriented Approach to Java Synchronization

    Designers of concurrent programs are faced with many choices of synchronization mechanisms, among which clear functional trade-offs exist. Making synchronization customizable is highly desirable as different deployment scenarios of the same program often place different precedence on synchronization choices. Unfortunately, such customizations cannot be accomplished in the conventional non-modular implementation...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Apr 2012

    Achieving High-Bitrate Overlay Live Streaming With Proxy Helpers

    Meeting a high bitrate requirement (say, 1 Mbps) in overlay live streaming is challenging. The authors consider the design and optimization of an overlay network formed by distributed proxies for high-bitrate live streaming. The video stream is divided into sub-streams and pushed via multiple trees to all the proxy servers...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Nov 2012

    A Game Formulation of Duopoly Market With Coexistence of SoftSim and Regular Users

    The stable subscription relationships between users and Wireless Service Providers (WSPs) are established on the long-term service contracts and SIM (Subscriber Identity Module) cards. However, Apple's "SoftSim" plan will break the subscription relationships. With SoftSim devices, users can flexibly switch WSPs at fine time scales, which provides more choices to...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Oct 2009

    Cooperative Content Distribution in Multi-Rate Wireless Networks

    Content distribution is a key application in an infrastructure-based wireless network. Existing works on this area use either pure broadcast transmission or pure unicast transmission. In this paper, the authors propose a hybrid broadcast-unicast transmission scheme to improve the efficiency of content distribution for wireless networks with multi-rate support. In...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Oct 2009

    Multi-Team Data Flow Optimization in Wireless Multi-Rate Multi-hop Networks

    In this paper, the authors study the problem of join routing and scheduling of multi-team data flows multicasting in wireless multirate multi-hop networks with the objective of minimizing the time required to complete the transmission transactions. They prove in this paper that the optimal join routing and scheduling problem is...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Oct 2011

    Interference Alignment Algorithm for Quasi-Static MIMO Cellular System

    In this paper, the authors propose an iterative Interference Alignment (IA) algorithm for quasi-static MIMO cellular networks. Such networks impose a key technical challenge in the IA algorithm design, namely the overlapping between the direct and interfering links due to the cellular topology. They shall address this challenge and propose...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Jul 2012

    Rethinking the Architecture Design of Data Center Networks

    In the rising tide of the Internet of things, more and more things in the world are connected to the Internet. Recently, data has kept growing at a rate more than four times of that expected in Moore's law. This explosion of data comes from various sources such as mobile...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Nov 2012

    Discovering a Large Scale Internet Topology : Complementary and Contrast View

    The Chinese Internet, hosting the world's largest population of Internet users, has largely remained as a black box due to the lack of large-scale measurement infrastructure and various other factors. In this paper, the authors characterize the Chinese Internet AS topology using measurements from both data and control planes. Their...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Jan 2009

    Understanding the Roles of Servers in Large-Scale Peer-Assisted Online Storage Systems

    Online storage systems that provide versatile and convenient platforms for content distribution have attracted significant attention over the Internet. To guarantee adequate levels of service quality and to minimize server cost, such systems typically deploy dedicated servers while effectively utilizing peer bandwidth in a complementary fashion. It is essential to...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Jun 2011

    Fundamental Relationship Between Node Density and Delay in Wireless Networks with Unreliable Links

    Wireless communication sees an explosive growth in the number of customers in the past few decades, making Large-scale wireless network an important part of modern life. The authors investigate the fundamental relationship between node density and transmission delay in Large-scale wireless networks with unreliable links from percolation perspective. Previous works...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Jan 2012

    Spectrum Trading with Insurance in Cognitive Radio Networks

    Market based spectrum trading has been extensively studied to realize efficient spectrum utilization in Cognitive Radio Networks (CRNs). In this paper, the authors utilize the concept of insurance in spectrum trading so as to improve spectrum efficiency in CRNs. They show that by additionally purchasing a specifically designed insurance contract...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Nov 2012

    Exploring Frequency Diversity With Interference Alignment in Cognitive Radio Networks

    The available spectrum in cognitive radio networks is usually discontinuous but wide, which provides abundant frequency domain diversity. In this paper, the authors identify the opportunity of leveraging the newly-emerged technique interference alignment to exploit such diversity to support concurrent transmission and improve the network throughput in secondary networks. To...

    Provided By Hong Kong University of Science and Technology

  • White Papers // Nov 2012

    FlatNet: Towards a Flatter Data Center Network

    The design of the data center network that interconnects the massive number of servers is very important to ensure the agility and robustness of the data center to meet the requirements of the applications. In response to this challenge, the research community have begun exploring novel interconnect topologies including FatTree,...

    Provided By Hong Kong University of Science and Technology