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检索条件"主题词=network coding"

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2FSK modulation for multiuser physical-layer network coding network

2FSK modulation for multiuser physical-layer network coding ...

引用

IEEE International Conference on Communications (ICC)

作者： De-You Zhang Qi-Yue Yu Wei-Xiao Meng Cheng Li Harbin Institute of Technology China Memorial University Canada

The physical-layer network coding (PNC) has become a hot research topic, since it can potentially reduce the transmission time slots and increase the channel capacity. However, current studies are mainly concentrated on three nodes (two users and one relay) network. This paper considers a specific multiuser network that includes M (M>2) users with one relay, and illustrates the transmission scheme and evaluates its bit error rate (BER), information theoretical capacity and anti-noise performance under AWGN channel. Moreover, 2FSK is considered in the proposed network, since it does not need accurate phase tracking. Simulation results show that its information theoretical capacity would decrease significantly with the number of users in this network increase, however the capacity of the proposed scheme is still better than that of the IEEE802.11 networks.

关键词： Bit error rate Relays Simulation Equations Ad hoc networks Decoding network coding

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On the Max2-Min network coding for wireless data broadcasting

On the Max2-Min network coding for wireless data broadcastin...

引用

International Conference on Communications and networking in China (CHINACOM)

作者： Hui Tian Kui Xu Youyun Xu Dongmei Zhang Wei Xie PLA University of Science and Technology Nanjing China

ISBN: (纸本)9781479987962

In wireless broadcasting systems, lost packets are retransmitted to guarantee the correct reception of each packet. Traditional automatic retransmission request (ARQ) protocol retransmits one packet per slot, which leads to low spectrum efficiency. In this paper, we propose a Max2-Min network coding based Wireless BroadCasting (WBC) protocol. Specifically, to reduce the overall number of retransmissions, lost packets of different user equipments (UEs) are combined by performing Max2-Min network coding (NC) at the base station. Then, NC combined packets are broadcasted to all the UEs. At each UE, lost packets can be recovered by using the proposed joint network and recursive systematic convolution (RSC) decoder (JNRD). Theoretical analyses and simulation results show that the proposed Max2-Min NC based WBC protocol outperforms traditional NC based WBC protocol on the average number of transmissions performance.

关键词： Protocols network coding Wireless communication Broadcasting Delays Maximum likelihood decoding

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Peer-to-Peer Streaming with Hierarchical network coding

Peer-to-Peer Streaming with Hierarchical Network Coding

引用

IEEE International Conference on Multimedia and Expo (ICME)

作者： Kien Nguyen Thinh Nguyen Sen-ching Cheung School of EECS Oregon State University USA ECE Department University of Kentucky USA

In recent years, content delivery networks (CDN) and Peer-to-Peer (P2P) networks have emerged as two effective paradigms for delivering multimedia contents over the Internet. An important feature in CDN and P2P networks is the data redundancy across multiple servers/peers which enables efficient media delivery. In this paper, we propose a network coding framework for efficient media streaming in either content delivery networks or P2P networks in which, multiple servers/peers are employed to simultaneously stream a video to a single receiver. Unlike previous multi-sender schemes, we show that network coding technique can (a) reduce the redundancy storage, (b) eliminate the need for tight synchronization between the senders, and (c) be integrated easily with TCP. Furthermore, we propose the Hierarchical network coding (HNC) technique to be used with scalable video bit stream to combat bandwidth fluctuation on the Internet. Simulation results demonstrate that our proposed scheme can result in bandwidth saving up to 40% for many cases over the traditional schemes.

关键词： Peer to peer computing network coding Streaming media network servers Bandwidth Web server IP networks Throughput Redundancy Fluctuations

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Enhancing concurrency in parallel random network coding

Enhancing concurrency in parallel random network coding

引用

International Conference on Big Data and Smart Computing (BIGCOMP)

作者： Seong-Min Choi Heehoon Shin Joon-Sang Park Dept. of Computer Engineering Hongik University Seoul Korea

It is known that network coding helps enhance various performance metrics in networked systems. However, to take advantage of network coding, especially random network coding, low encoding/decoding latency must be guaranteed. In this paper, we introduce a fast random network coding parallelization technique targeting multicore processors.

关键词： network coding Decoding Graphics processing units Encoding Vectors Peer-to-peer computing Throughput

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Research on VANET network coding Strategy in Expressway Scene

Research on VANET Network Coding Strategy in Expressway Scen...

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International Conference on Information and Communication Technologies for Disaster Management (ICT-DM)

作者： Hua Zhang Xiangyu Bai Lei Yao Inner Mongolia A.R. Key Laboratory of Wireless Networking and Mobile Computing School of Computer Science Inner Mongolia University Hohhot Inner Mongolia Autonomous Region China

ISBN: (纸本)9781665432863

VANET is a real-time, intelligent transportation network featuring motion patterns limited by roads, diverse transmission data, and frequent topological changes. In the highway scene, the network coding and the roadside unit are introduced to assist the data transmission in order to solve such problems as single data transmission path and short communication link duration. When the vehicle node transmits data, it will first determine the type of vehicle node at this time, and select the best transmission path as the main path of the encoded data packet according to the relative position information of the vehicle nodes, the difference of the requested content storage nodes, and the vehicle density. The path acts as a secondary path for the transmission of encoded packets. Finally, the routing strategy proposed in this paper is implemented by the opportunistic network simulator ONE simulation. According to the experimental results, the routing strategy proposed in this paper can effectively improve the message delivery rate, reduce the average network delay and network overhead.

关键词： Roads Vehicular ad hoc networks Transportation Disaster management network coding Routing Real-time systems

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Unified construction algorithm of network coding in cyclic networks

Unified construction algorithm of network coding in cyclic n...

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Asia-Pacific Conference on Communications

作者： Jiaqing Huang Liang Wang Tiyuan Zhang Hui Li Department of Electronics and Information Engineering Hubei Key Laboratory of Smart Internet Tech. Huazhong University of Science and Technology Wuhan China The Key Laboratory of Integrated Microsystems Shenzhen Graduate School Peking University Shenzhen China

ISBN: (纸本)9781424447848

network coding in cyclic networks may have better performance than network coding in acyclic networks with regard to the multi-unicast scenarios. Harvey et al. showed that network coding in cyclic networks can be strictly better than fractional routing in conservative networks which have widely practical scenarios such as P2P networks. Hence, we motivated investigating how to achieve that better performance of network coding in cyclic networks by a general construction algorithm. Li et al. presented there are four levels for network code in cyclic networks, including basic convolutional network code (BCNC), convolutional dispersion (CD), convolutional broadcast (CB) and convolutional multicast (CM). Subsequently, it is interesting to investigate how to construct all four levels of network coding in cyclic networks. Based on our previous work of construction algorithm of BCNC, we proposed a unified algorithm to construct network coding in cyclic networks using notion of flow set. Our contributions were as follows: (1) we showed insights of the essential difference between two classes(i.e. BCNC and CD/CB/CM) of network codes in cyclic networks. (2) we showed insights how to uniformly handle cycles for these two classes of network codes in cyclic networks by proposing the unified construction algorithm. Here, we used the cycles classifications defined by Barbero et al., including link cycles but flow-acyclic, simple flow cycles and flow knots(simply knots).

关键词： network coding Multicast algorithms Convolutional codes Routing Broadcasting IP networks Laboratories Cost accounting Encoding Kernel

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Optimization-Based Linear network coding for General Connections of Continuous Flows

Optimization-Based Linear Network Coding for General Connect...

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IEEE International Conference on Communications

作者： Ying Cui Muriel Medard Edmund Yeh Douglas Leith Ken Duffy Dept. of EE Shanghai Jiao Tong University Dept. of EECS MIT Dept. of ECE Northeastern University Dept. of CS Trinity College Dublin Hamilton Institute NUI Maynooth

ISBN: (纸本)9781467364300

For general connections, the problem of finding network codes and optimizing resources for those codes is intrinsically difficult and little is known about its complexity. Most of the existing solutions rely on very restricted classes of network codes in terms of the number of flows allowed to be coded together, and are not entirely distributed. In this paper, we consider a new method for constructing linear network codes for general connections of continuous flows to minimize the total cost of edge use based on mixing. We first formulate the minimum-cost network coding design problem. To solve the optimization problem, we propose two equivalent alternative formulations with discrete mixing and continuous mixing, respectively, and develop distributed algorithms to solve them. Our approach allows fairly general coding across flows and guarantees no greater cost than any solution without inter-flow network coding.

关键词： network coding Optimization Complexity theory Distributed algorithms Linear codes Minimization

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Towards Deterministic network coding in Hierarchical networks

Towards Deterministic Network Coding in Hierarchical Network...

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International Conference on Artificial Intelligence, Modelling and Simulation (AIMS)

作者： Oana Graur Werner Henkel Transmission Systems Group (TrSys) Jacobs University Bremen Germany

Starting from a recently proposed network coding resource optimization method, we discuss the scalability of this solution to larger scale-free topologies that are also characterized by a realistic link loss distribution which we derive from measurements. We sketch a possibility of designing a network coding aware multicast routing scheme for hierarchical networks.

关键词： Peer-to-peer computing network coding Protocols Extraterrestrial measurements Packet loss Routing

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Connected Dominating Set based network coding for SDN

Connected Dominating Set based Network Coding for SDN

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International Conference on Contemporary Computing and Informatics

作者： Amit Singh Aitha Nagaraju Department of Computer Science Central University of Rajasthan Kishangarh Ajmer India-305817

ISBN: (纸本)9781509052578

In order to address complex and resource demanding applications, Software Defined networks (SDN) and network coding (NC) paradigm has garnered much attention in recent years. NC is the key concept of networking to enhance network throughput and reliability, whereas SDN is the modern network architecture to virtualized network services for making route more flexible and allocating network resources on-the-fly. NC advances the conventional store-and-forward concept of packet flow by the notion of a store-code-forward among the intermediate nodes. With effect, source and destination no longer need to track singular packets, but rather targeting enough autonomous encoded packets. The practical coding gain lies on the complication of deploying coding techniques over the classical network of routers. The comprehensive view of SDN can overcome this challenge by separating network architecture into control plane and data plane. This paper counsels the use of SDN which not only assist traffic, but also manage buffering, scheduling and processing of packets. Further, the paper presents NC functionality rich Connected Dominated Set based Flow-oriented coding-aware Routing technique (CFCR) to optimize number of transmissions over the SDN network.

关键词： network coding Software Defined networks CDS based Flow-oriented coding-aware routing for SDN

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A network coding Approach to IP Traceback

A Network Coding Approach to IP Traceback

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Workshop on network coding, Theory and Applications (NetCod)

作者： Pegah Sattari Minas Gjoka Athina Markopoulou University of California Irvine USA

ISBN: (纸本)9781424471898;9781424471904

Traceback schemes aim at identifying the source(s) of a sequence of packets and the nodes these packets traversed. This is useful for tracing the sources of high volume traffic, e.g., in Distributed Denial-of-Service (DDoS) attacks. In this paper, we are particularly interested in Probabilistic Packet Marking (PPM) schemes, where intermediate nodes probabilistically mark packets with information about their identity and the receiver uses information from several packets to reconstruct the paths they have traversed. Our work is inspired by two observations. First, PPM is essentially a coupon collector's problem. Second, the coupon collector's problem significantly benefits from network coding ideas. Based on these observations, we propose a network coding-based approach (PPM+NC) that marks packets with random linear combinations of router IDs, instead of individual router IDs. We demonstrate its benefits through analysis. We then propose a practical PPM+NC scheme based on the main PPM+NC idea, but also taking into account the limited bit budget in the IP header available for marking and other practical constraints. Simulation results show that our scheme significantly reduces the number of packets needed to reconstruct the attack graph, in both single- and multi-path scenarios, thus increasing the speed of tracing the attack back to its source(s).

关键词： network coding Traffic control Telecommunication traffic Queueing analysis IP networks Delay effects Stochastic processes Internet Communication system traffic control Performance analysis

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