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检索条件"主题词=Network coding"

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On applicability of the network coding techniqe to 6LoWPAN/IEEE802.15.4-based sensor networks

On applicability of the network coding techniqe to 6LoWPAN/I...

引用

Military Communications and Information Systems Conference (MCC)

作者： Jaroslaw Krygier Marek Amanowicz Faculty of Electronics Telecommunications Institute Warsaw POLAND

In this paper we discuss the conditions of network coding technique applicability to 6LoWPAN/IEEE802.15.4-based sensor networks. The paper shows that the network coding technique based on the COPE solution can be used in sensor network however not without constraints. The main problem concerns a limited memory of the sensor nodes, header compression used in 6LoWPAN standard and limitations in 6LoWPAN implementations.

关键词： network coding Testing Wireless sensor networks Encoding Packet loss Wireless communication

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Inter-session inter-layer network coding-based dual distributed control for heterogeneous-service networks

Inter-session inter-layer network coding-based dual distribu...

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IEEE Conference on Wireless Communications and networking

作者： Zhihui Liu Junyi Wang Wenjun Xu Shengyu Li Jiaru Lin Key Lab of Universal Wireless Communications University of Posts and Telecommunications Beijing China Key Laboratory of Cognitive Radio and Information Processing Guilin University of Electronic Technology Guilin China

ISBN: (纸本)9781479930845

Recent advances in network coding have shown great potential for efficient information transfer. In this paper, exploiting inter-layer and inter-session network coding, we address the distributed control problem in heterogeneous-service networks (HSNs) with booming multi-rate multicast (MRM) and unicast (UC) services. Different from the literatures on inter-layer/inter-session schemes, heterogeneity and fairness among MRM users and between different services are jointly considered. With the Lagrangian and subgradient method, a decentralized rate control algorithm is developed with little coordination among intermediate nodes, in which only local information is needed to achieve rate, congestion, and fairness balance control. Numerical examples are provided to verify the effectiveness and convergence of the proposed algorithm. Furthermore, we demonstrate the performance improvement and implementation advantages of the proposed algorithm compared with the previous solutions considering layered coding for an MRM service or inter-session coding limited for UC services.

关键词： network coding Encoding Decentralized control Vectors Optimization Bandwidth Unicast

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Soft-bit Correction with Robust Quantize-and-Forward for Physical Layer network coding in Two-Way Relay Fading Channel

Soft-bit Correction with Robust Quantize-and-Forward for Phy...

引用

IEEE International Conference on Communications

作者： Dong Fang Alister G. Burr Department of Electronics University of York

ISBN: (纸本)9781457720529

In this paper, we propose a novel fading correction and relaying scheme for physical layer network coding (PLNC) in the two-way relay (TWR) fading channel. The fading correction on the soft-bit level at nodes can eliminate the effect of fading on the TWR channel. In order to broadcast the soft-bit in an optimal way, we design a quantize-and-forward scheme which is robust for the TWR fading channel. In addition, an optimized mapping is used to implement unequal error protection (UEP) for bits with different significance in the quantization index. The soft-bit correction and the robust quantize-and-forward scheme are fully compatible with one another. Both low complexity and good performance can be provided.

关键词： Fading channels fading color hierarchical network Physical layer network coding relay Bidirectional Drill bits

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On the Benefits of network coding for Wireless Applications

On the Benefits of Network Coding for Wireless Applications

引用

International Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless networks (WiOpt)

作者： C. Fragouli J. Widmer J.-Y. le Boudec EPF Lausanne Lausanne Switzerland DoCoMo Conimunications Laboratories Europe GmbH Munich Germany

We argue that the main benefits of network coding in a wireless environment might manifest in situations where the topology dynamically changes, and operation is restricted to distributed algorithms that do not employ knowledge about the network environment. We consider several problem instances in this set-up, that include broadcasting information to all nodes of the network and collecting sensor measurements. We show that in many such cases, under some simplifying assumptions, the problem is theoretically equivalent to simple variations of the coupon collector problem. Thus network coding can offer benefits of a factor of log n, where n is the number of nodes and the benefits are in terms of energy efficiency, as was proven in [3]. We present simulation results under more realistic conditions that support this claim.

关键词： network coding

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Distributed cooperative MAC for wireless networks based on network coding

Distributed cooperative MAC for wireless networks based on n...

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IEEE Conference on Wireless Communications and networking

作者： Heng Qin Ruonan Zhang Bin Li Lin Cai Northwestern Polytechnical University Xi'an Shaanxi China University of Victoria Victoria British Columbia Canada

ISBN: (纸本)9781479984077

In dense wireless local area networks (WLANs), the hidden stations (HSs) cause severe collisions and performance degradation. Although cooperative communications can achieve spatial diversity, how to efficiently cooperate in a wireless network is a challenging issue due to the distributed nature of the stations. The contributions of this paper are two-fold. First, we establish an analytical model for the IEEE 802.11 WLANs with HSs using the mean value analysis method, which can provide the theoretical results of collision probability, frame service time and network throughput. Second, we propose a new medium access control (MAC) protocol, named network coding cooperative MAC (NCC-MAC) to utilize cooperation to relieve the HS problem. Different from the traditional RTS/CTS scheme, NCC-MAC utilizes random linear coding (RLC) to realize opportunistic cooperative transmission without extra control messages. Furthermore, the ACK-triggering mechanism is introduced which can help to avoid repeated collision caused by HS(s) in dense WLANs and also improve the efficiency of the coded cooperation. Simulations have been conducted to compare the performance of NCC-MAC with DCF, simple cooperative MAC (SC-MAC) without network coding, and other cooperative MAC in the literature. The results show that NCC-MAC can effectively realize station cooperation and reduce the effect of HS(s), improving the network throughput and delay performance considerably.

关键词： IEEE 802.11 Standards Media Access Protocol Payloads Wireless LAN network coding Analytical models

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Fountain Codes with XOR of Encoded Packets for Broadcasting and source independent backbone in Multi-hop networks using network coding

Fountain Codes with XOR of Encoded Packets for Broadcasting ...

引用

IEEE Vehicular Technology Conference

作者： Khaldoun Al Agha Nour KADI Ivan Stojmenovic LRI Paris XI University SITE University of Ottawa

ISBN: (纸本)9781424425167

We consider multiple source asynchronous broad-casting problem. That is, in each broadcast, one of the nodes is the source, and the message is to be received, unaltered, by all the other nodes in the network. We propose to exploit LT code, which is one of the fountain codes, with the source independent backbone in order to reduce the number of transmissions for broadcasting with network coding in ad hoc wireless network. We use the principle of LT code to perform network coding in a simple distributed manner where encoding can be applied with both received singletons and non-singletons, and generated candidates can be used in an optimization criteria. We show by simulation that our approach reduces the number of transmissions required for flooding.

关键词： broadcasting network coding wireless multi-hop networks Mobile ad hoc networks exclusive OR optimal criterion Codes fountain Level Trigger Spine network node Ganglia Transmissions

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Random network coding based solution for resource efficient data dissemination

Random Network Coding based solution for resource efficient ...

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IEEE International Conference on Intelligent Computer Communication and Processing (ICCP)

作者： Zsuzsanna Ilona Kiss Zsolt Alfred Polgar Communications Department Technical University of Cluj Napoca Cluj-Napoca Romania

The paper proposes a Random network coding based solution for data dissemination applications involving multiple unicast or multicast transmissions between a source and several destinations. The solution proposed is based on a mathematical framework derived from the theory of Random network coding employed in multicast transmissions. This framework specifies the conditions allowing to each destination to decode only the flows of interest, when the total rate of the source flows is larger than the capacity of the network. A testbed, shortly described in the paper, was implemented for proof of concept and the performances of the coded transmissions were compared to that of uncoded transmissions. The results show the improvement brought by our solution in what concerns the packet loss rate obtained for different ratios between the source flows rates and the transfer rates of the test topology's bottleneck links.

关键词： Encoding network coding Unicast Decoding network topology Topology Computers

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Maximizing coding Gain in Wireless networks with Decodable network coding

Maximizing Coding Gain in Wireless Networks with Decodable N...

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Ad-Hoc and Sensor networks Symposium

作者： Maggie Cheng Quanmin Ye Xiaochun Cheng Lin Cai Missouri University of Science and Technology Computer Science Department Nokia Networks Middlesex University Computer Science Department University of Victoria Electrical and Computer Engineering Department

ISBN: (纸本)9781479966653

network coding improves transmission efficiency by combining packets at relay nodes and thus reduces the number of packets sent to the network. It is a network layer solution to improve network throughput and transmission efficiency. However, a coded packet must be decodable by the destination, otherwise it is a waste of resource to combine them together and to deliver the coded packet. This paper addresses how to find the coding solution that guarantees decodability at the destination. We first quantify the coding gain as the number of transmissions reduced, and then provide a method for runtime check whether a coding pair can be separated at the destination. The optimal coding solution is selected as the one that provides the maximum coding gain among all the decodable pairs. The algorithms can be applied to both unicast and multicast traffic. Simulation results show the number of transmissions can be reduced significantly, especially for multicast traffic where there are rich opportunities to apply network coding.

关键词： coding gain network coding transmission efficiency Wireless networks Packet destination Unicast network throughput Runtime Transmissions transmission

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Reliable communications with network coding in narrowband powerline channel

Reliable communications with Network Coding in narrowband po...

引用

IEEE International Symposium on Power Line Communications and Its Applications (ISPLC)

作者： Josu Bilbao Aitor Calvo Igor Armendariz Pedro M. Crespo Muriel Médard Communications Department Mondragon Spain Electronics and Communications Dept Tecnun University of Navarra San Sebastian Spain MIT Research Lab. of Electronics Cambridge MA USA

Due to its wide availability narrowband powerline networks provide an interesting no-new-wires communication channel. Nevertheless, as powerline was not designed for data communication, its electrical characteristics make it a harsh environment for data transmission and prevents the deployment of services with high reliability requirements. This paper presents 3 main outcomes: (i) The characterization of the transmission error correlation among different nodes in a narrowband powerline network, which acts in favour of the cooperative schemes. (ii) Based on the conclusions obtained from real measurements campaign, we propose a new OSI-Layer2 scheme based on network coding to achieve reliable communications in narrowband powerline. (iii) We demonstrate the benefits of the proposed scheme validating its real implementation in an embedded system, and comparing the achieved performance improvement with different legacy ARQ schemes.

关键词： Narrowband Receivers Reliability Correlation Noise network coding Transmitters

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Random network coding Based on Adaptive Sliding Window in Wireless Multicast networks

Random Network Coding Based on Adaptive Sliding Window in Wi...

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IEEE Conference on Vehicular Technology (VTC)

作者： Bin Li Siying Bi Ruonan Zhang Yi Jiang Quan Li Northwestern Polytechnical University Xi'an China

ISBN: (纸本)9781509016990

network coding offers a promising platform for multicast transmission to improve the throughput. However, the users may not collect a full set of the encoded packets to recover the useful information because of its block processing property, leading to the low throughput under wireless fading channel. While the schemes that using feedback from all the receivers to cover the problem above always causes the huge feedback overhead in large network. Accordingly, in this paper we proposed an adaptive sliding window random network coding(ASWRNC) that introduce RNC with lower triangular coefficient matrix and sliding window to achieve higher network throughput and lower feedback overhead. Particularly, we introduce an adaptive encoding scheme that can let the user decode out partial original packets without collecting the full set of encoded packets. On the other hand, the window sliding scheduling helps the user with better channel decode out more original packets. Further, we discuss in detail the feedback-compete mechanism to decline the feedback overhead.

关键词： Encoding Throughput network coding Transmitters Adaptive systems Wireless communication Receivers

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