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检索条件"主题词=Network coding"

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Preliminary implementation of point-to-multi-point multicast transmission based on cross-layer QoS and network coding

Preliminary implementation of point-to-multi-point multicast...

引用

International Conference on Software, Telecommunications and Computer networks (SoftCOM)

作者： Zsolt Polgar Zsuzsanna Kiss Andrei Bogdan Rus Georgeta Boanea Melinda Barabas Virgil Dobrota Communications Department Technical University of Cluj Napoca Cluj-Napoca Romania

ISBN: (纸本)9781424449736

This paper presents a possible application of the cross-layer QoS mechanism for network coding in Future Internet. The idea is that the congestion control could be solved for core networks if a network coding-based point-to-multipoint transmission is implemented with quality of service information collected in a bottom-up approach. The implemented testbed combines a real-time demonstrator monitoring transfer rates, one-way delays and BERs at substrate network with network coding simulated in OMNET++ at virtual network level.

关键词： network coding Quality of service Multicast protocols IP networks Communication system control Testing Signal restoration Internet Telecommunication traffic Proposals

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Optimization on Cooperative Communications Based on network coding in Multi-hop Wireless networks

Optimization on Cooperative Communications Based on Network ...

引用

International Wireless Communications and Mobile Computing Conference, IWCMC

作者： Xiande Bu Chuan Liu Qiang Yu Lei Yin Feng Tian State Grid Laboratory of Electric Power Communication Network Global Energy Interconnection Research Institute Nanjing China Key Lab of Broadband Wireless Communication and Sensor Network Technology (Nanjing Universityof Posts and Telecommunications) Ministry of Education Nanjing China

ISBN: (数字)9781728131290

ISBN: (纸本)9781728131306

Cooperative communications (CC) based on network coding (NC) can significantly increase the capacity of wireless networks. In this paper, we investigate how to apply NC in multi-hop wireless networks with multiple relay nodes and multiple sessions to achieve more practical and general CC based on NC. Based on NC, we consider to jointly optimize relay node selecting, scheduling and flow routing in CC in a multi-hop wireless network. We not only construct a mathematical model but also formulate a maximum-minimum (Max-Min) optimization problem for it. Then we reformulate and solve it with CPLEX. Through simulation, we validate that the achieved rate gain by NC can be greatly improved than the one by CC.

关键词： Relays Spread spectrum communication Wireless networks Routing Optimization Mathematical model network coding

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On error control codes for random network coding

On error control codes for random network coding

引用

Workshop on network coding, Theory and Applications (NetCod)

作者： R. Ahlswede H. Aydinian Department of Mathematics University of Bielefeld Bielefeld Germany

The random network coding approach is an effective technique for linear network coding, however it is highly susceptible to errors and adversarial attacks. Recently Kotter and Kschischang introduced the operator channel, where the inputs and outputs are subspaces of a given vector space, showing that this is a natural transmission model in noncoherent random network coding. A suitable metric, defined for subspaces: d S (U, V ) = dim U + dim V - 2 dim(U cap V), gives rise to the notion of codes capable of correcting different kinds of errors (like packet errors, erasures etc.) in noncoherent random network coding. In this paper we continue the study of coding for operator channels started. We consider codes correcting insertions/deletions (dimension enlargement and dimension reduction respectively). Bounds and constructions for those codes are presented.

关键词： Error correction network coding Error correction codes network topology Vectors Galois fields Mathematics Multicast algorithms Multicast communication Memoryless systems

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Analog network coding in general SNR regime

Analog network coding in general SNR regime

引用

IEEE International Symposium on Information Theory

作者： Samar Agnihotri Sidharth Jaggi Minghua Chen Department of Information Engineering Chinese University of Hong Kong Hong Kong China

ISBN: (纸本)9781467325790

The problem of maximum rate achievable with analog network coding for a unicast communication over a layered wireless relay network with directed links is considered. A relay node performing analog network coding scales and forwards the signals received at its input. Recently this problem has been considered under two assumptions: (A) each relay node scales its received signal to the upper bound of its transmit power constraint, (B) the relay nodes in specific subsets of the network operate in the high-SNR regime. We establish that assumption (A), in general, leads to suboptimal end-to-end rate. We also characterize the performance of analog network coding in a class of symmetric layered networks without assumption (B). The key contribution of this work is a lemma that states that in a layered relay network a globally optimal set of scaling factors for the nodes that maximizes the end-to-end rate can be computed layer-by-layer. Specifically, a rate-optimal set of scaling factors for the nodes in a layer is the one that maximizes the sum-rate of the nodes in the next layer. This critical insight allows us to characterize analog network coding performance in network scenarios beyond those that can be analyzed using the existing approaches. We illustrate this by computing the maximum rate achievable with analog network coding in one particular layered network, in various communication scenarios.

关键词： Relays network coding Optimized production technology Signal to noise ratio Vectors Wireless communication

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On message lengths for noisy network coding

On message lengths for noisy network coding

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IEEE (first ITW conference of the year) Information Theory Workshop (ITW)

作者： Gerhard Kramer Jie Hou Technische Universität München Munchen Germany

Quantize-map-forward (QMF) and noisy network coding (NNC) differ primarily from compress-forward relaying in that relays do not hash their quantization bits. Two further differences are that source nodes use “long”-message repetitive encoding and destination nodes use simultaneous joint decoding. Recent work has shown that classic “short”-message encoding combined with backward decoding achieves the same rates as QMF and NNC. A simplified proof of this result is given.

关键词： Relays Decoding Encoding Quantization Artificial neural networks Noise measurement network coding

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Ensuring privacy preservation in wireless networks against traffic analysis by employing network coding and Blowfish encryption

Ensuring privacy preservation in wireless networks against t...

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International Conference on Signal and Information Processing (IConSIP)

作者： V. C. Dongre S. G. Shikalpure Department of Computer Science and Engineering Government Engineering College Aurangabad Maharashtra India

ISBN: (纸本)9781509015238

Open air transmission is imperative asset of Multi-hop wireless network; which enables malicious attackers to do attacks such as traffic analysis. This motivates enormous need of securing privacy of MWN. The necessity of privacy issue pioneers concept of network coding. To avert traffic analysis attacks it has to be implemented which integrates coding and mixing operation at in-between nodes. Simple use of network coding is not enough to resolve privacy threat in MWN. This paper proposes random network coding scheme along with Blowfish encryption algorithm to achieve source anonymity and message data concealment. To effectively prohibit traffic analysis attacks, this algorithm enhances features of homomorphic encryption such as Paillier encryption used in existing system. This proposed system offers the feature of random coding. Property of inverting GEVs with a very high probability is used by each sink to recover the source packets. The strength and efficiency of the proposed system is evident through theoretic exploration and simulative data assessment.

关键词： Encryption Privacy network coding Algorithm design and analysis Wireless networks Encoding

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Toward Neighborhood Prediction Using Physical-Layer network coding

Toward Neighborhood Prediction Using Physical-Layer Network ...

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IEEE International Conference on Communications

作者： Eugene David Ngangue Ndih Soumaya Cherkaoui Department of Electrical and Computer Engineering Universite de Sherbrooke

ISBN: (纸本)9781457720529

In this paper we investigate the improvements in the capability of neighborhood prediction when the Physical-Layer network coding (PLNC) is used for relaying messages in Vehiculars Ad Hoc networks (VANETs). We compute the probability that a link between two nodes is available at a given time in a three-node cooperative network, and we demonstrate that the use of PLNC, compared to the use of network coding (NC)-based or traditional routing (TR)-based relaying techniques, leads to a better accuracy of the neighborhood prediction. We also demonstrate that the accuracy of the prediction is tightly related to the mobility model used and that this tight relationship can be relaxed by using PLNC-based relaying neighborhood prediction (PRNP). The results demonstrate that PRNP can improve the accuracy of neighborhood prediction due to the high network capacity of PLNC-based networks.

关键词： hierarchical network network coding Neighborhood PRNP gene Physical layer relaying network capacity

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Physical Layer Implementation of network coding in Two-Way Relay networks

Physical Layer Implementation of Network Coding in Two-Way R...

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IEEE International Conference on Communications

作者： Hongjuan Yang Weixiao Meng Bo Li Gang Wang Communication Research Center Harbin Institute of Technology

ISBN: (纸本)9781457720529

network coding, which works in the network layer, is an effective technology to improve the throughput of two-way relay networks. In this paper, we compare the existing network coding schemes: traditional network coding (NC) scheme, physical-layer network coding (PNC) scheme and soft network coding (SNC) scheme, and propose a new physical layer scheme which can be seen as the implementation of network coding in two-way relay networks. Relay nodes combine the received signals from two source nodes before demodulation and channel decoding. The computational complexity and BER performance of the proposed scheme are analyzed compared with the previous schemes. Theoretical analysis show that the proposed scheme can save 50% computational cost of demodulation and channel decoding processes compared with NC scheme, meanwhile increase the power efficiency of the relay nodes in two-way relay networks significantly. Future works with the proposed scheme are also discussed.

关键词： Physical layer implementation network coding Two-way relay networks Physical-layer network coding Soft network coding Relay networks network coding Demodulation Bidirectional network network layer Physical layer dynamic efficiency Bidirectional Scheme Trunk Node Channel Decoder received signal

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Efficient Protection in Single-Domain networks Using network coding

Efficient Protection in Single-Domain Networks Using Network...

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2010 IEEE Global Telecommunications Conference GLOBECOM 2010

作者： Isil Burcu Barla Franz Rambach Dominic A. Schupke Georg Carle Nokia Siemens Networks Munich Germany Technical University Munich Munich Germany

Quality of service requirements and the increasing amount of data transmission demand for efficient protection mechanisms. Existing mechanisms like 1+1 and 1+N path protection offer instantaneous recovery but they suffer from high capacity needs and nodal degree requirements, respectively. The high nodal degree requirement makes an implementation of the 1+N mechanism in transport networks difficult. In this paper, we develop two new mechanisms by applying network coding on a virtualized protection scheme. These mechanisms are more resource-efficient compared to 1+1, and are implementable in transport networks even under stringent nodal degree constraints. The difference between the two mechanisms lies in complexity and performance. Therefore, either of them can be preferred as a good compromise between 1+1 and 1+N in different scenarios according to the needs and available resources.

关键词： Equations Peer to peer computing Complexity theory network coding Mathematical model Galois fields Optical fiber networks

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An Optimal Transmit Power Allocation for the Two-Way Relay Channel Using Physical-Layer network coding

An Optimal Transmit Power Allocation for the Two-Way Relay C...

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IEEE International Conference on Communications Workshops, ICC

作者： W. Shin N. Lee J. B. Lim C. Shin Communication Laboratory Samsung Advanced Institute of Technology Samsung Electronics Company Limited Yongin si Gyeonggi South Korea Communication Laboratory Samsung Advanced Institute of Technology Samsung Electronics Co. Ltd. Yongin-Si Gyeonggi-Do Korea

A two-way relaying system using the physical-layer network coding (PNC) does not cause the spectral loss induced by the half-duplex signaling. Furthermore, when the total power, which is limited, is properly distributed to transmission nodes in such a system, the system capacity will be enhanced significantly. In this paper, we propose an optimal power allocation in the two- way relay channel employing the PNC protocol. The optimal power allocation is obtained by maximizing the achievable sum- rate of the PNC protocol under a sum-power constraint in a Rayleigh fading channel environment. Numerical experimental results confirm that the proposed power allocation scheme achieves much higher achievable sum-rate performance than the existing schemes.

关键词： Relays network coding Power system relaying Protocols Fading Broadcasting Transmitters Wireless communication Laboratories Propagation losses

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