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On Power Allocation for Alamouti STBC OFDM Systems with distributed Transmit Antennas in the Presence of Residual Frequency Offsets

On Power Allocation for Alamouti STBC OFDM Systems with Dist...

引用

international conference on Wireless Communications, networking and Mobile computing (WiCom)

作者： Ke Sun Shihai Shao Youxi Tang Yi Wang Jiayin Zhang National Key Laboratory of Science and Technology on Communications University of Electronic Science and Technology Chengdu China Corporate Research Department Huawei Technologies Company Limited Shanghai China

This paper proposes a transmit power allocation scheme for distributed transmit antenna Alamouti space-time block coded (STBC) orthogonal frequency division multiplexing (OFDM) systems using Cholesky decision-feedback detection in the presence of multiple residual frequency offsets (RFOs). Multipath Rayleigh fading is considered, and separate power constraint on each transmit antenna is assumed. The lower bound on the average bit error ratio (BER) performance is derived, and the optimal power allocation scheme based on minimizing that bound is then proposed. Simulation results show that the proposed power allocation scheme in certain cases only consumes as little as 50-65% of the transmit power used by the full power allocation scheme while enhancing the BER performance.

关键词： OFDM Transmitting antennas Resource management Bit error rate Antenna arrays Receiving antennas Random variables

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A distributed Trust-based Reputation Model in P2P System

A Distributed Trust-based Reputation Model in P2P System

引用

ACIS international conference on Software Engineering, Artificial Intelligence, networking, and Parallel/distributed computing (SNPD)

作者： Yu-mei Liu Shou-bao Yang Lei-tao Guo Wan-ming Chen Liang-min Guo Department of Computer Science and Technology University of Science and Technology China Department of Automation University of Science and Technology Hefei China

The P2P system is an anonymous and dynamic system, thus, some malicious behaviour can't be punished. In order to restrict the malicious behaviour in the P2P system, researchers have focused on establishing effective reputation systems. However, the present reputation system can't avoid the trick of the false reputation feedback. We propose a distributed trust-based reputation model in p2p system (TBRM) to avoid it. The TBRM algorithm differentiated the node's capability of providing honest quality by the nodes reputation value, and the honest evaluation by the trust value. In our model, the reputation value represented the resource quality of the provider, thus, other nodes would like this node have low reputation value. At this time, the false reputation feedback happened. In this paper, we used the trust value to restrict the false reputation feedback For the nodes with low trust value was difficult to get the required resource, we punished the false reputation feedback by low their trust value. We show by both theoretical analysis and simulations that the proposed TBRM algorithm can get quick convergence which is 11 times, high equity for both low and high reputation nodes, and can get a high successful rate of file- downloading. When the malicious nodes' rate is 80%, the proposed TBRM is about 95% successful rate, compared to the algorithm without reputation who is only 27%.

关键词： Peer to peer computing Feedback distributed computing Analytical models Resists Digital signatures Social network services Software engineering Artificial intelligence Computer science

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Modeling for Facility Location Optimization of Spent Computers' Reverse Logistics

Modeling for Facility Location Optimization of Spent Compute...

引用

international conference on Wireless Communications, networking and Mobile computing (WiCom)

作者： Zhaohua Wang Jianhua Yin Sch. of Manage. & Econ. Beijing Inst. of Technol. Beijing Sch. of Bus. Univ. of Int. Bus. & Econ. Beijing

In spent computers reverse logistics, an important planning problem is the location optimization of landfills or treatment facilities for recovering/reusing used products or materials. Combining with the spent computers' taking-back characteristics, after a brief introduction to the basic concepts of reverse logistics, we present a two-level location problem with three types of facility to be located in a specific reverse logistics system. For this problem, we propose a 0-1 mixed integer programming model. Then, an algorithm based on Lagrangian heuristics is developed. Finally, it takes Tai'an city in Shandong Province in China as a case to prove the availability of the model.

关键词： Reverse logistics Cities and towns Lagrangian functions Costs Linear programming Pollution Mathematical model distributed computing Character generation Waste disposal

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A Cloud Trust Evaluation System using Hierarchical Fuzzy Inference System for Service Selection

A Cloud Trust Evaluation System using Hierarchical Fuzzy Inf...

引用

IEEE international conference on Advanced Information networking and Applications

作者： Chenhao Qu Rajkumar Buyya The Cloud Computing and Distributed Systems (CLOUDS) Lab Department of Computing and Information Systems The University of Melbourne Australia

ISBN: (纸本)9781479936311

Cloud computing is an utility computing paradigm that allows users to flexibly acquire virtualized computing resources in a pay-as-you-go model. To realize the benefits of using cloud, users need to first select the suitable cloud services that can satisfy their applications' functional and non-functional requirements. However, this is a difficult task due to large number of available services, users' unclear requirements, and performance variations in cloud. In this paper, we propose a system that evaluates trust of clouds according to users' fuzzy Quality of Service (QoS) requirements and services' dynamic performances to facilitate service selection. We demonstrate the effectiveness and efficiency of our system through simulations and case studies.

关键词： Cloud computing Trust Service Selection QoS IaaS Hierarchical Fuzzy Inference System

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Best Position Algorithms for Top-k Query Processing in Highly distributed Environments

Best Position Algorithms for Top-k Query Processing in Highl...

引用

The First international conference on networking and distributed computing(第一届网络与分布式计算国际会议 ICNDC 2010)

作者： Qiming Fang Guangwen Yang Weimin Zheng Bo Wang Ying Zhao Tsinghua National Laboratory for Information Science and Technology Department of Computer Science a Tsinghua National Laboratory for Information Science and Technology Department of Computer Science a

Efficient top-* query processing in highly distributed environments is useful but challenging. This paper focuses on the problem over vertically partitioned data and aims to propose efficient algorithms with lower communication cost Two new algorithms, DBPA and BulkDBPA, are proposed in this paper. DBPA is a direct extension of the centralized algorithm BPA2 into distributed environments. Absorbing the advantage of low data access of BPA2, DBPA has the advantage of low data transfer, though it requires a lot of communication round trips which greatly affect the response time of the algorithm. BulkDBPA improves DBPA by utilizing bulk read and bulk transfer mechanism which can significantly reduce its round trips. Experimental results show that DBPA and BulkDBPA require much less data transfer than SA and TPUT, and BulkDBPA outperforms the other algorithms on overall performance. We also analyze the effect of different parameters on query performance of BulkDBPA and especially investigate the setting strategies of the bulk size.

关键词： top-k quay best position algorithm DBPA BulkDBPA

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Constructing Interest-Oriented Search Union of Web Servers based on P2P Overlay

Constructing Interest-Oriented Search Union of Web Servers b...

引用

international conference on Communications and networking in China (CHINACOM)

作者： Feng Hong Minglu Li Jiadi Yu Zhongwen Guo Department of Computer Science and Engineering Ocean University of China China Department of Computer Science and Engineering Shanghai Jiao Tong University China

We consider the problem of building Web information retrieval mechanism through distributed solution based on Peer-to-Peer technology. We describe a prototype system called IOSUW (Interest-Oriented Search Union of Web servers) that is currently under development in our group. IOSUW provides a highly distributed global indexing and query execution services which are based on the organization of P2P overlay. IOSUW is different from many other approaches to P2P search in that it aims to achieve the interest-oriented search results for users. We give an overview of the proposed system and discuss the basic design choices. We also give preliminary simulation results on the web collection of about 3k web pages. The simulation shows the result of IOSUW and indicate three recommending approaches for users to make use of IOSUW.

关键词： Web server Search engines Peer to peer computing Computer science distributed computing Blogs Oceans Web pages Explosions Web and internet services

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Performance issues of grid computing based on different architecture cluster computing platforms

Performance issues of grid computing based on different arch...

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international conference on Advanced Information networking and Applications (AINA)

作者： Hsun-Chang Chang Kuan-Ching Li Yaw-Ling Lin Chao-Tung Yang Hsiao-Hsi Wang Liang-Teh Lee Department of Computer Science and Information Management Providence University Taichung Taiwan Department of Computer Science and Information Engineering Tunghai University Taichung Taiwan Department of Computer Science and Engineering Tatung University Taipei Taiwan

ISBN: (纸本)0769522491

This research paper discusses performance issues of cluster and grid computing platforms, and reasons to support the implementation of these computing infrastructures. A number of benchmark programs are executed in these computing systems, in order to perform performance analysis of experimental results. We are able to show that cluster platforms are excellent alternatives to access to supercomputing, due to its cost/performance, scalability and commodity components factors. In addition, we also show that grid technology is viable by increasing total system performance at no additional cost.

关键词： Grid computing Computer architecture distributed computing Computer networks High performance computing Concurrent computing Computer science Central Processing Unit Workstations Biology computing

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A distributed Bandwidth Reservation Protocol for QoS Routing in Mobile Ad Hoc Networks

A Distributed Bandwidth Reservation Protocol for QoS Routing...

引用

international conference on Wireless Communications, networking and Mobile computing (WiCom)

作者： Xiangli Wang Layuan Li Bencan Gong Wenbo Wang School of Computer Science and Technology Wuhan University of Technology Wuhan China School of Science Wuhan University of Science and Technology Wuhan China

The paper proposes a distributed bandwidth reservation protocol (DBRP) for QoS routing in ad hoc networks. The protocol adopts a TDMA-based model, derives from AODV, refers to the idea of three slot states (*** et al., 2004), and adopts two-time reservation and controlling-flooding scheme. The protocol takes both the hidden-terminal and exposed-terminal problems into account. And it can solve the simultaneous reservation of several paths. In addition, controlling-flooding method can effectively control routing overhead, and two-time reservation can improve request success rate. Simulation results show the new protocol has better performance in denser networks and heavier traffic conditions.

关键词： Bandwidth Routing protocols Mobile ad hoc networks Time division multiple access Paper technology Multiaccess communication Communication system control Computer science Ad hoc networks Communication system traffic control

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A distributed Iterative Interference Alignment Scheme for K-User MIMO Interference Channel

A Distributed Iterative Interference Alignment Scheme for K-...

引用

international conference on Wireless Communications, networking and Mobile computing (WiCom)

作者： Ruixue Zhou Tiejun Lv Wei Long School of Information and Telecommunication Engineering Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781612846842

In this paper, we propose an iterative interference alignment scheme to improve the sum rate performance of the K-user MIMO interference channel. We design the precoding matrices to minimize the leakage interference. Linear receiver decoding matrices based on the Minimum Mean Square Error (MMSE) criterion are used to further eliminate the interference. Furthermore, the receiver filter is designed not only for removing the interference from the undesired transmitters but also separating its own spatial streams. Our scheme can be achieved with lower complexity comparing with maximizing the signal to interference-plus-noise rate (MAX-SINR) scheme while providing a comparable performance, and it can be done in a distributed manner where only local channel knowledge is needed for each user. By iteratively updating the precoding and decoding matrices, it converges to the solution that can remove the interference of each user effectively. Monte-Carlo simulations have been provided to illustrate the performance of the proposed schemes comparing with the existing schemes.

关键词： Interference Receivers Transmitters Signal to noise ratio Iterative decoding MIMO Complexity theory

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Trust Enhanced Security - A New Philosophy for Secure Collaboration of Mobile Agents

Trust Enhanced Security - A New Philosophy for Secure Collab...

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international conference on Collaborative computing: networking, Applications and Worksharing (CollaborateCom)

作者： Ching Lin Vijay Varadharajan Department of Computing Macquarie University NSW Australia

The mobile agent computing model violates some of the fundamental assumptions of conventional security techniques. Consequently, this has rendered many of the existing conventional security countermeasures less effective for mobile agents. In this paper, we propose a new philosophy of trust enhanced security, which advocates a paradigm shift for mobile agent security solutions: from security-centric to trust-centric with the aim of providing improved security and performance of mobile agents. We first examine the problem of uncertainty in behavior induced by the security assumption violations by mobile agents; we then propose a trust enhanced security approach and argue for the need for a paradigm shift to trust-centric solutions. Next we identify a list of general design requirements for the trust-centric solutions and outline the new architectural design which supports the new trust enhanced security philosophy in practice. Finally we discuss the emergent properties of the new architecture and introduce the experimental results for validating the properties

关键词： Security Collaboration Mobile agents Authorization Uncertainty Computer industry Computer architecture distributed computing IP networks Resumes

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