National Chiao Tung University

Displaying 41-49 of 49 results

  • White Papers // Mar 2009

    On the Capacity of Free-Space Optical Intensity Channels

    New upper and lower bounds are presented on the capacity of the free-space optical intensity channel. This channel is characterized by inputs that are nonnegative (representing the transmitted optical intensity) and by outputs that are corrupted by additive white Gaussian noise (because in free space the disturbances arise from many...

    Provided By National Chiao Tung University

  • White Papers // Jan 2009

    A Flexible P2P Publish/subscribe Framework

    Nowadays, many structured P2P algorithms have been proposed frequently. Consequently, the P2P application developers need to learn different P2P API semantics. Developers will take additional efforts if they want to replace the underlying P2P networks of their P2P applications with other ones. Moreover, it is difficult for the developers to...

    Provided By National Chiao Tung University

  • White Papers // Dec 2008

    Energy Efficient Intra-Task Dynamic Voltage Scaling for Realistic CPUs of Mobile Devices

    It is not energy efficient to run a CPU at full speed all the time for all kinds of tasks in mobile devices. This paper proposes two energy efficient intra-task Dynamic Voltage Scaling (DVS) algorithms for CPUs. There are three main contributions in this paper. Firstly, unlike the tedious derivation...

    Provided By National Chiao Tung University

  • White Papers // Nov 2008

    Implementation of Data Encryption Through Dual Domain Operation on Digital Signal Processor

    In order to protect original data, data encryption is first consideration direction for digital information copyright. In addition, to achieve high quality image, the algorithm maybe can not run on embedded system because the computation is very complexity. However, almost nowadays algorithms need to build on consumer production because integrator...

    Provided By National Chiao Tung University

  • White Papers // Oct 2008

    A Novel Embedded Bandwidth-Aware Frame Compressor for Mobile Video Applications

    To reduce the bandwidth requirement and the size of frame memory for video decoding, embedding a compressor/decompressor on the chip is a well-known solution. Video compression has been developed for a long time and numbers of algorithm have been proposed. Those algorithms show one that enhancing the complexity can reach...

    Provided By National Chiao Tung University

  • White Papers // Sep 2008

    A Mobility Management Strategy for GPRS

    In General Packet Radio Service (GPRS), a Mobile Station (MS) is tracked at the cell level during packet transmission, and is tracked at the Routing Area (RA) level when no packet is delivered. A READY Timer (RT) mechanism was proposed in 3GPP 23.060 to determine when to switch from cell...

    Provided By National Chiao Tung University

  • White Papers // Jun 2008

    Filtering of Unnecessary Branch Predictor Lookups for Low-Power Processor Architecture

    Efforts to reduce power consumption of processors have gained much attention recently. Dynamic branch predictor, including BTB, is exercised in every instruction cycle, yet branch instructions only constitute a small percentage of instructions during program execution. This paper proposes a novel method to collect the next branch distances of the...

    Provided By National Chiao Tung University

  • White Papers // Dec 2007

    A Novel Approach to Comparison-Based Diagnosis for Hypercube-Like Systems

    Interconnection network has been an active research area for parallel and distributed computer systems. The diagnosability is one of the important issues in the reliability of interconnection networks. In this paper, a novel idea on system diagnosis called local diagnosability is presented. The concept of local diagnosability is strongly related...

    Provided By National Chiao Tung University

  • White Papers // Aug 2007

    Event-Driven Dynamic Workload Scaling for Uniprocessor Real-Time Embedded Systems

    Many embedded systems are designed to take timely reactions to the occurrences of particular scenarios. For example, an automobile controlling system should simultaneously control cruising, traction, the brake system, and the engine. A real-time surveillance system in a shopping mall could track a number of moving people and evaluate pre-defined...

    Provided By National Chiao Tung University

  • White Papers // Mar 2012

    Compressive-Domain Interference Cancellation Via Orthogonal Projection: How Small the Restricted Isometry Constant of the Effective Sensing Matrix Can Be?

    Knowledge of the achievable Restricted Isometry Constant (RIC) of the sensing matrix is crucial for assessing the signal reconstruction performance of compressive sensing systems. In this paper, the authors consider compressive-domain interference cancellation via orthogonal projection, and study the achievable RIC of the effective sensing matrix, namely, the product of...

    Provided By National Chiao Tung University

  • White Papers // Mar 2012

    Resource Allocations for MISO Based Cognitive Radio OFDMA Systems

    The authors propose an optimal and a suboptimal resource allocation algorithms for sum rate maximization in an MISOOFDMA based cognitive radio network subject to a primary user outage constraint. By converting the outage constraint into user and subcarrier dependent peak power constraints, they obtain the optimal joint subcarrier assignment and...

    Provided By National Chiao Tung University

  • White Papers // Mar 2012

    Green Resource Allocation for MIMO-OFDM Relay Networks

    This paper studies the joint resource allocation problem of antenna, sub-channel, transmission power, and phase duration for the relay-enhanced bidirectional Multiple-Input Multiple-Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) networks. The goal of resource allocation is to minimize the transmission energy in the networks with multiple Relay Stations (RSs) under the data...

    Provided By National Chiao Tung University

  • White Papers // Mar 2012

    Prediction-Based Handover Schemes for Relay-Enhanced LTE-A Systems

    Relay Nodes (RN) have been suggested to be placed near the edge of a cellular network in order to improve link qualities of cell edge User Equipments (UEs). Compared to conventional homogeneous networks, system performance for the relay-enhanced network can be significantly degraded if handovers between the RNs and evolved...

    Provided By National Chiao Tung University

  • White Papers // Dec 2008

    Energy Efficient Intra-Task Dynamic Voltage Scaling for Realistic CPUs of Mobile Devices

    It is not energy efficient to run a CPU at full speed all the time for all kinds of tasks in mobile devices. This paper proposes two energy efficient intra-task Dynamic Voltage Scaling (DVS) algorithms for CPUs. There are three main contributions in this paper. Firstly, unlike the tedious derivation...

    Provided By National Chiao Tung University

  • White Papers // Dec 2007

    A Novel Approach to Comparison-Based Diagnosis for Hypercube-Like Systems

    Interconnection network has been an active research area for parallel and distributed computer systems. The diagnosability is one of the important issues in the reliability of interconnection networks. In this paper, a novel idea on system diagnosis called local diagnosability is presented. The concept of local diagnosability is strongly related...

    Provided By National Chiao Tung University

  • White Papers // Aug 2007

    Event-Driven Dynamic Workload Scaling for Uniprocessor Real-Time Embedded Systems

    Many embedded systems are designed to take timely reactions to the occurrences of particular scenarios. For example, an automobile controlling system should simultaneously control cruising, traction, the brake system, and the engine. A real-time surveillance system in a shopping mall could track a number of moving people and evaluate pre-defined...

    Provided By National Chiao Tung University

  • White Papers // Jun 2008

    Filtering of Unnecessary Branch Predictor Lookups for Low-Power Processor Architecture

    Efforts to reduce power consumption of processors have gained much attention recently. Dynamic branch predictor, including BTB, is exercised in every instruction cycle, yet branch instructions only constitute a small percentage of instructions during program execution. This paper proposes a novel method to collect the next branch distances of the...

    Provided By National Chiao Tung University

  • White Papers // Apr 2012

    Performance Evaluation of Inter-Processor Communication for an Embedded Heterogeneous Multi-Core Processor

    Embedded systems often use a heterogeneous multi-core processor to improve performance and energy efficiency. This multi-core processor is composed of a General Purpose Processor (GPP), which manages the program flow and I/O, and a Digital signal Processor (DSP), which processes mass data. An Inter-Processor Communication (IPC) mechanism is thus required...

    Provided By National Chiao Tung University