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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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The Geographic Information System Based on distributed Parallel Computation

The Geographic Information System Based on Distributed Paral...

引用

international conference on networking and Digital Society, ICNDS

作者： He Huang Zhihua Wei Zhuoqiu Li College of Science Wuhan University of Technology Wuhan China Wuhan University of Technology Wuhan China

Geographic Information System (GIS) has been widely used in the geotechnical engineering field, but it is incompetent in real-time computation. In this paper, the Geographic Information System based on distributed parallel computation named GISPC is introduced. The implementation of domain decomposition on the server is the preprocessing of parallel computation. With the method of adopting MPI on Cluster of Workstation (COW) platform in the system, the parallel FEM codes can be implemented by C++ Object-Oriented Programming (OOP) technique. The large-scale geotechnical problems can be successfully solved on PC machine groups by using these techniques. And the system is capable of internet publication. It enables fast storage and retrieval of large amounts of information stored in the server through intranet and internet. The instance of Longtan high slope is shown to prove the applicability of these methods. The results show the feasibility of the proposed methods for the extensive application of GIS in geotechnical engineering.

关键词： Geographic Information Systems Concurrent computing distributed computing Internet Real time systems Workstations Object oriented programming Large-scale systems Information retrieval Web server

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distributed Task Scheduling in Heterogeneous Fog Networks: A Matching with Externalities Method

Distributed Task Scheduling in Heterogeneous Fog Networks: A...

引用

international conference on computing, networking and Communications (ICNC)

作者： Zening Liu Kunlun Wang Ming-Tuo Zhou Ziyu Shao Yang Yang SHIFT School of Information Science and Technology ShanghaiTech University Shanghai China

ISBN: (数字)9781728149059

ISBN: (纸本)9781728149066

Fog computing shows great potential advantages over legacy cloud computing in terms of latency and efficiency. While it also poses huge challenges in task scheduling and resource allocation, which are key to reap the full benefits of fog computing. Facing the new characteristics of fog computing, distributed task scheduling and resource allocation algorithms are necessary but challenging, which will be investigated in this paper. To minimize the latency in a distributed manner, a many-to-one matching game with externalities is formulated for task scheduling problems in fog networks, considering the inter-dependency among tasks in both communication and computation. Further, a distributed algorithm called distributed Two-sided Stable Task Scheduling (DTS2) algorithm is proposed to find a two-sided exchange-stable solution. Analytical and simulation results show that the proposed DTS2 algorithm can converge to a sub-optimal two-sided exchange-stable solution with low-complexity. Specifically, the DTS2 algorithm can greatly reduce the service delay than the one-sided stable matching. Besides, it can offer sub-optimal performance in system average delay but serve more users, compared with the optimal solution.

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Energy-aware task allocation over MANETs

Energy-aware task allocation over MANETs

引用

IEEE international conference on Wireless and Mobile computing, networking And Communications (WiMob)

作者： W. Alsalih S. Akl H. Hassanein School of Computing Queen's University Kingston ONT Canada

Since the emergence of mobile computing, reducing energy consumption of battery-operated computing devices has become a very active research area. The widespread popularity of mobile computing devices, such as laptops, handheld devices and cell phones, motivates this research area. Several hardware based techniques have been proposed; this has led to more energy-efficient systems. Nevertheless, it is presumed in the literature of energy-aware design that software based techniques have the potential to reduce energy demand and contribute to solve the problem. In this paper, we look into the problem of distributing computational tasks amongst a set of mobile computing devices in a mobile wireless ad hoc network (MANET) in such a way that reduces the total consumed energy. In such a distributed environment, the assignment of computational tasks to different devices plays a vital role in energy conservation. The main contributions of this paper are formulating a novel energy-aware allocation problem and proposing a heuristic-based greedy algorithm to solve it approximately. Our allocation algorithm assigns a set of computational tasks, which may communicate with each other, into a set of heterogeneous processors in such a way that minimizes the total consumed energy. Experiments show that our algorithm is near-optimal in most of the tested benchmarks.

关键词： Mobile computing distributed computing Handheld computers Computer networks Mobile ad hoc networks Energy consumption Portable computers Cellular phones Hardware Energy efficiency

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TD-SCDMA Baton Handoff Strategy Based on Fuzzy Control Theory

TD-SCDMA Baton Handoff Strategy Based on Fuzzy Control Theor...

引用

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

作者： Xuan Luo Liangrui Tang

In this paper, by exploiting fuzzy control theory, the optimum system performance has been achieved based on channel reservation and preemptive priority mechanism in baton handoff strategy. In this proposed scheme, the new voice call threshold is adjusted by using fuzzy control theory and the blocking rate with different attributes is controlled reasonably, which lead to the integral performance achieve optimization. The experimental results indicate that this scheme has outstanding advantages in controlling blocking rate, and the system performance remains stable in spite of the growing business through timely adjustment.

关键词： Fuzzy control System performance Business Communities distributed databases Time division synchronous code division multiple access Educational institutions

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Designing networking Service for Multimedia Service Composition over Programmable Network Substrate

Designing Networking Service for Multimedia Service Composit...

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international conference on P2P, Parallel, Grid, Cloud and Internet computing (3PGCIC)

作者： Namgon Kim JongWon Kim Networked Media Lab. Gwangju Institute of Science and Technology (GIST) Gwangju Korea

Multimedia service composition provides a flexible way of building customized multimedia content production and delivery by composing distributed multimedia-oriented services dynamically to provide new functionalities. Previous researches have addressed various aspects of multimedia service composition such as composability, QoS-awareness, and load balancing. Most of them however have assumed that multimedia-oriented services are composed mainly with resources located on the computing devices while taking the required networking support as granted. However, realizing the required networking support is a challenging task and it acutally needs fundamental upgrade to the existing network infrastructure (i.e., for the network infrastructure of disruptive Future Internet). As a partial answer to this futuristic networking challenge, in this paper, we introduce the concept of so-called networking services that run on network devices to provide networking-related functionalities required for multimedia service composition. By composing the designed networking services with the computing-type services, we could dynamically configure and provide the necessary networking characteristics for the targeted multimedia applications. To validate the concept of designed networking services, by taking required networking connectivity as an example, we attempt an early instantiation of networking services over Open Flow-based programmable network substrate.

关键词： Multimedia communication Substrates Internet Control systems Aggregates Protocols Computer architecture

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Two-Stage Online Reinforcement Learning based distributed Optimal Resource Allocation for Multiple RIS-assisted Mobile Ad-Hoc Network

Two-Stage Online Reinforcement Learning based Distributed Op...

引用

international conference on computing, networking and Communications (ICNC)

作者： Yuzhu Zhang Hao Xu Department of Electrical and Biomedical Engineering University of Nevada Reno Reno US

In this paper, distributed optimal resource allocation problem for multiple Reconfigurable Intelligent Surface (RIS) assisted wireless mobile ad-hoc networks (MANET) has been studied. A novel resource allocation technique needs to be developed that cannot only optimize the overall RIS-assisted MANET network quality, e.g. maximizing energy efficiency, minimizing power consumption, etc., but also be capable of handling the uncertainty in wireless MANET environment, such as time-varying wireless channel, in real time. Therefore, a novel two-stage online reinforcement learning based optimal distributed resource allocation algorithm has been developed. At Stage I, an online distributed cooperative actor-critic reinforcement learning is developed along with neural networks (NNs) to learn the optimal transmit power control, RIS phase shift control for multiple users with a given RIS selection policy. Then, in stage II, the second reinforcement learning algorithm is activated to find the optimal RIS selection policies for the system Using alternative optimization theory, the distributed optimal resource allocation can be achieved while two-stage reinforcement learning algorithms are converging along with time. Eventually, numerical simulations have been provided to demonstrate the effectiveness of the developed scheme.

关键词： Wireless communication Uncertainty Power demand Power control Reinforcement learning Numerical simulation Real-time systems

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Power Spreading in distributed Transmit Antennas

Power Spreading in Distributed Transmit Antennas

引用

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

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

In distributed antenna system (DAS), delay spreads between the receiver and each transmit antenna are different due to the unequal propagation delays from distributed transmit antennas to mobile receivers. To exploit the merit of DAS, power spreading in distributed transmit antennas is proposed for OFDM-based MIMO systems over frequency-selective fading channel. In this scheme, partial power of the same symbol can be transmitted simultaneously in the distributed antennas after spatial power spreading. Then the multipath-faded symbol information from different transmitter can be resolved at the receiver. It can be considered that M T L duplicates of original symbol are obtained where L is the number of channel taps and M T is the number of transmit antennas, and hence higher multipath diversity could be achieved. Combined with frequency power spreading and ML detection, this scheme can achieve better performance than that without spatial power spreading. Simulation results are provided with 2 transmit and 2 receive antennas, demonstrating about 1.5 dB signal to noise ratio (SNR) gain is obtained at bit error rate (BER) of 1e-3.

关键词： Transmitting antennas Antenna arrays OFDM Receiving antennas Bit error rate Delay

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Challenges of MPI over IPv6

Challenges of MPI over IPv6

引用

international conference on networking and Services (ICNS)

作者： Adrian Knoth Christian Kauhaus Dietmar Fey Lars Schneidenbach Bettina Schnor Institute of Computer Science Friedrich-Schiller-Universitat Jena Germany Institute of Computer Science University of Potsdam Germany Germany

The message passing interface (MPI) [17] is the most widely used message passing library for parallel applications on compute clusters. Here, we present our experiences in developing an IPv6 enabled MPI version for both most popular implementations, the MPICH2 and the Open MPI implementations. Further, we discuss how these IPv6 enabled MPI implementations can be used within multi-cluster and grid topologies.

关键词： Message passing Libraries Virtual private networks Computer science Concurrent computing Grid computing distributed computing Performance loss Application software Computer applications

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Enhancing cargo container security during transportation: A mesh networking based approach

Enhancing cargo container security during transportation: A ...

引用

2008 IEEE international conference on Technologies for Homeland Security, HST'08

作者： Su, Jin Kim Deng, Guofeng Gupta, Sandeep K.S. Murphy-Hoye, Mary Impact Lab. Department of Computer Science and Engineering Arizona State University Tempe AZ 85281 United States Intel Corp. Chandler AZ 85226 United States

ISBN: (纸本)1424419778

Cargo containers which transport 90 percent of the world's trade transit the countries of the world daily. Despite the vulnerability of cargo containers, only about 5 percent of the over 10 million cargo containers entering the U.S. each year can be inspected now. Our primary goal is to develop the smart container security system using RFID and Wireless Sensor Networks in order to enhance the cargo container security. In addition, the end-to-end visibility via this networked tracking and sensing capability can bring additional commercial benefits to supply chain and chain of custody. In this paper, we first propose a dynamic mesh container network among neighboring containers. Since a group of containers moves together, we can take advantages of interaction between them via this mesh container network instead of focusing an individual container. Second, we introduce the concept of Mobile Edge computing Devices (MECD) which is the interface between distributed sensors and the end server in order to reduce processing and band width requirements to the end servers. MECDs can give scalability, flexibility, reliability, and cost-efficiency to our cargo container security system. ©2008 IEEE.

关键词： Security systems

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