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检索条件"机构=Computer Science and Engineering.Chalmers University of Technology"

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Multipair massive MIMO full-duplex relaying with MRC/MRT processing

Multipair massive MIMO full-duplex relaying with MRC/MRT pro...

引用

2014 1st IEEE International Conference on Communications, ICC 2014

作者： Ngo, Hien Quoc Suraweerat, Himal A. Matthaiou, Michail Larsson, Erik G. Linköping University Linköping Sweden Department of Electrical and Electronics Engineering University of Peradeniya Peradeniya Sri Lanka School of Electronics Electrical Engineering and Computer Science Queen's University Belfast Belfast United Kingdom Department of Signals and Systems Chalmers University of Technology Gothenburg Sweden

ISBN: (纸本)9781479920037

We consider a multipair relay channel, where multiple sources communicate with multiple destinations with the help of a full-duplex (FD) relay station (RS). All sources and destinations have a single antenna, while the RS is equipped with massive arrays. We assume that the RS estimates the channels by using training sequences transmitted from sources and destinations. Then, it uses maximum-ratio combining/maximum-ratio transmission (MRC/MRT) to process the signals. To significantly reduce the loop interference (LI) effect, we propose two massive MIMO processing techniques: i) using a massive receive antenna array;or ii) using a massive transmit antenna array together with very low transmit power at the RS. We derive an exact achievable rate in closed-form and evaluate the system spectral efficiency. We show that, by doubling the number of antennas at the RS, the transmit power of each source and of the RS can be reduced by 1.5 dB if the pilot power is equal to the signal power and by 3 dB if the pilot power is kept fixed, while maintaining a given quality-of-service. Furthermore, we compare FD and half-duplex (HD) modes and show that FD improves significantly the performance when the LI level is low. © 2014 IEEE.

关键词： Quality of service

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QBLESS: A case for QoS-aware bufferless NoCs

QBLESS: A case for QoS-aware bufferless NoCs

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International Workshop on Quality of Service

作者： Zhicheng Yao Xiufeng Sui Tianni Xu Jiuyue Ma Juan Fang Sally A. McKee Binzhang Fu Yungang Bao College of Computer Science Beijing University of Technology State Key Laboratory of Computer Architecture CAS University of Chinese Academy of Sciences Computer Science and Engineering Chalmers University of Technology Sweden

Datacenters consolidate diverse applications to improve utilization. However when multiple applications are co-located on such platforms, contention for shared resources like Networks-on-Chip (NoCs) can degrade the performance of latency-critical online services (high-priority applications). Recently proposed bufferless NoCs have the advantages of requiring less area and power, but they pose challenges in quality-of-service (QoS) support, which usually relies on buffer-based virtual channels (VCs). We propose QBLESS, a QoS-aware bufferless NoC scheme for datacenters. QBLESS consists of two components: a routing mechanism (QBLESS-R) that can substantially reduce flit deflection for high-priority applications, and a congestion-control mechanism (QBLESS-CC) that guarantees performance for high-priority applications and improves overall system throughput. We use trace-driven simulation to model a 64-core system, finding that when compared to BLESS, a previous state-of-the-art bufferless NoC design, QBLESS improves performance of high-priority applications by an average of 33.2%.

关键词： Quality of service Routing Throughput Ports (computers) Registers Google Educational institutions

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An experimental study of distributed consensus protocol in AUTOSAR based system

An experimental study of distributed consensus protocol in A...

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International Forum on Strategic technology, IFOST

作者： Dewan Mahabub Sarwar A. G. M. Zaman Shovan Kumar Paul Department of Computer Science American International University-Bangladesh Dhaka Bangladesh Department of Computer Science and Engineering Chalmers University of Technology Gothenburg Sweden

AUTOSAR (AUTomotive Open System Architecture) is a layered and modular software architecture which simplifies the complexity of automotive system design. Currently, this standard has no support for fault tolerance. Fault tolerance will be required in the design for future automotive systems to avoid catastrophic system failures and hazardous events. In this paper, we present an experimental study of fault tolerance by means of software in AUTOSAR based system. The aim of the experiment is to investigate how fault tolerance mechanism can be implemented in AUTOSAR based system. We implement distributed consensus protocol to investigate the impact of fault tolerance in distributed scenario. In addition, we measure the timing overhead of consensus protocol in which we observe that execution time declines with the increasing number of joining nodes.

关键词： Protocols Fault tolerance Fault tolerant systems Software Automotive engineering Light emitting diodes Standards

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Effective resource management towards efficient computing 14

Effective resource management towards efficient computing

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Design, Automation and Test in Europe Conference and Exhibition

作者： Per Stenström Department of Computer Science and Engineering Chalmers University of Technology S-412 96 GÖTEBORG Sweden

ISBN: (纸本)9783981537024

Improving performance of computers at historical rates, as dictated by Moore's Law, is becoming increasingly more challenging especially because we are hitting the chip power-budget wall. But challenges usually direct us to focus on opportunities we have neglected in the past. I will focus on some of these overlooked opportunities in this talk. One such opportunity is to question what are meaningful performance goals for individual applications. I will present a resource management framework in which architectural resources are assigned to applications based on their performance requirements. The talk also covers some innovations that enable us to compute more power-efficiently by using memory resources more effectively by, for example, exploiting value locality.

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Multi-agent distributed method for dynamic power system rebalancing

Multi-agent distributed method for dynamic power system reba...

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IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT Europe)

作者： Giorgos Georgiadis Christopher Saunders Marina Papatriantafilou Department of Computer Science and Engineering Chalmers University of Technology Gothenburg Sweden Department of Electronic and Computer Engineering Brunel University Uxbridge Middlesex United Kingdom

Global efforts aim at utilizing the available information technology in order to enhance the power grid with resilience properties, precise accounting and new services. Towards this end, we provide methods to support an adaptive power grid and study the relative changes in supply and/or demand while in a quasi-steady state. Acknowledging that the absolute amount of the power demand/supply is not always the limiting factor, the proposed algorithm focuses on the deviations in the generated and/or demanded resources, as well as the location of these changes in the grid. Through our experimental evaluation study we show that the algorithm leads to a faster reconvergence to a new steady state operating point when compared to convergence from initial conditions after changes complete. We also show that changes can be resolved in a distributed and local manner, needing only limited and fast communication with nodes that are far from the locus of change.

关键词： Steady-state Resource management Convergence Smart grids Power demand Europe

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A probabilistic analysis of resilient reconfigurable designs

A probabilistic analysis of resilient reconfigurable designs

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IEEE International Symposium on Defect and Fault Tolerance in VLSI Systems

作者： A. Malek S. Tzilis D. A. Khan I. Sourdis G. Smaragdos C. Strydis Computer Science and Engineering Department Chalmers University of Technology Sweden Neuroscience Department Erasmus Medical Center The Netherlands

Reconfigurable hardware can be employed to tolerate permanent faults. Hardware components comprising a System-on-Chip can be partitioned into a handful of substitutable units interconnected with reconfigurable wires to allow isolation and replacement of faulty parts. This paper offers a probabilistic analysis of reconfigurable designs estimating for different fault densities the average number of fault-free components that can be constructed as well as the probability to guarantee a particular availability of components. Considering the area overheads of reconfigurability, we evaluate the resilience of various reconfigurable designs with different granularities. Based on this analysis, we conduct a comprehensive design-space exploration to identify the granularity mixes that maximize the fault-tolerance of a system. Our findings reveal that mixing fine-grain logic with a coarse-grain sparing approach tolerates up to 3× more permanent faults than component redundancy and 2× more than any other purely coarse-grain solution. Component redundancy is preferable at low fault densities, while coarse-grain and mixed-grain reconfigurability maximize availability at medium and high fault densities, respectively.

关键词： Fault tolerant systems Circuit faults Wires Pipelines Availability Redundancy

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Experiences from Implementing the ETSI ITS SecuredMessage Service

Experiences from Implementing the ETSI ITS SecuredMessage Se...

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IEEE Intelligent Vehicles Symposium

作者： Nasser Nowdehi Tomas Olovsson Volvo Car Corporation Gothenburg Sweden Department of Computer Science and Engineering Chalmers University of Technology Gothenburg Sweden

ISBN: (纸本)9781479936397

Cooperative intelligent transport systems supporting secure vehicle to vehicle and vehicle to infrastructure communications, is becoming a very important topic. The aim of this paper is to share our experiences from implementing the ETSI Intelligent Transport System (ITS) SecuredMessage and sign/verify services on an existing ETSI ITS communication stack (ITSC). We have followed the new ETSI TS 103 097 vl.1.1 standard when implementing the security services, and have made our best to create a robust and secure implementation. Our goal has been to identify flaws and vulnerabilities in our implementation that are caused by weaknesses or deficiencies in the standard and in its description of services. We have then performed an analysis of the protocol, its headers and created test cases used to test our implementation. Several problems were found, and we have also repeated the tests with another, supposedly very stable implementation, provided by Fraunhofer FOKUS. To our surprise, this system also showed unexpected behavior as our system. We show that these problems are the result of weaknesses and complexities in the design of the standard. We present the problems found in our implementation and show what part in the standard was causing the problems. We show that several problems in the standard, mainly due to their complexity, open up for misinterpretation leading to various types of implementation errors. We conclude the paper with proposing changes to the standard to prevent other implementations from repeating the same mistakes.

关键词： ITS ITSC identify flaws

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Assessing scrubbing techniques for Xilinx SRAM-based FPGAs in space applications

Assessing scrubbing techniques for Xilinx SRAM-based FPGAs i...

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IEEE International Conference on Field-Programmable technology (FPT)

作者： Fredrik Brosser Emil Milh Vilhelm Geijer Per Larsson-Edefors Dept. of Computer Science and Engineering Chalmers University of Technology Gothenburg Sweden RUAG Space Gothenburg Sweden

SRAM-based FPGAs are becoming increasingly attractive for use in space applications due to their reconfigurability and signal processing capabilities, as well as their increasing speed and capacity. Traditional SRAM-based FPGAs, however, are highly sensitive to the ionizing radiation environment in space, making them prone to radiation-induced memory upsets. In this paper, we evaluate and compare scrubbing techniques for Xilinx SRAM-based FPGAs with respect to radiation-induced single event upsets. A test framework using an exchangeable payload is developed for this purpose and run on a Xilinx Virtex-5 FPGA. We show that recent SRAM-based FPGAs can constitute a cost-efficient alternative to radiation-hardened or antifuse FPGAs for non-critical space application such as satellite instruments.

关键词： Field programmable gate arrays Tunneling magnetoresistance Payloads Single event upsets Availability Testing Monitoring

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Digging deeper into cluster system logs for failure prediction and root cause diagnosis

Digging deeper into cluster system logs for failure predicti...

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IEEE International Conference on Cluster Computing

作者： Xiaoyu Fu Rui Ren Sally A. McKee Jianfeng Zhan Ninghui Sun University of Chinese Academy of Sciences State Key Laboratory Computer Architecture Chinese Academy of Sciences Computer Science and Engineering Chalmers University of Technology

As the sizes of supercomputers and data centers grow towards exascale, failures become normal. System logs play a critical role in the increasingly complex tasks of automatic failure prediction and diagnosis. Many methods for failure prediction are based on analyzing event logs for large scale systems, but there is still neither a widely used one to predict failures based on both non-fatal and fatal events, nor a precise one that uses fine-grained information (such as failure type, node location, related application, and time of occurrence). A deeper and more precise log analysis technique is needed. We propose a three-step approach to draw out event dependencies and to identify failure-event generating processes. First, we cluster frequent event sequences into event groups based on common events. Then we infer causal dependencies between events in each event group. Finally, we extract failure rules based on the observation that events of the same event types, on the same nodes or from the same applications have similar operational behaviors. We use this rich information to improve failure prediction. Our approach semi-automates diagnosing the root causes of failure events, making it a valuable tool for system administrators.

关键词： Correlation Data mining Kernel Clustering algorithms Semantics Predictive models Inference algorithms

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Towards designing secure in-vehicle network architectures using community detection algorithms

Towards designing secure in-vehicle network architectures us...

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IEEE Vehicular Networking Conference (VNC)

作者： Pierre Kleberger Nasser Nowdehi Tomas Olovsson Department of Computer Science and Engineering Chalmers University of Technology Gothenburg Sweden Volvo Car Corporation Gothenburg Sweden

Efforts in securing the in-vehicle network have resulted in a number of proposed security mechanisms in recent years. However, so far little attention has been given to the actual architecture of the in-vehicle network. An approach within in-vehicle network design is to divide the network into domains, where each domain consists of a set of Electronic Control Units (ECUs) that handles some united functionality, e.g., body control, powertrain, and telematics. Still, this approach is based on “best engineering practice” and there is room for improvements. In this paper, we study real traffic from a modern car and we try to divide the in-vehicle network into domains using automated partitioning algorithms. To find the optimum division, we select four community detection algorithms, known from social network analysis, and we evaluate their ability to find these domains. We conclude that community detection algorithms can be used to identify in-vehicle domains based on the message types (signals) used in the in-vehicle network and we demonstrate this by applying the algorithms to real data. The approach is not limited to only message types, but domains can also be identified based on other criteria, such as frequency of messages, payload sizes, or Automotive Safety Integrity Levels (ASILs). We also conclude that the identification of good domains can facilitate the implementation of security measures. Therefore, we believe that the approach has great potential to help engineers in deriving secure in-vehicle network architectures during the design of a vehicle.

关键词： Communities Vehicles Security Partitioning algorithms Detection algorithms Image edge detection Algorithm design and analysis

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