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International Conference on Advanced Technologies for Communications, ATC

作者： Cong Lam Sinh Tuan Nguyen Quoc Pierre Duhamel VNU University of Engineering and Technology Hanoi Vietnam L2S/CNRS Ecole Superieure dElectricite (SUPELEC) Paris France

Cooperative network coding is considered as a novel technology that integrates cooperative communications with network coding to improve the throughput and robustness of the network. In this paper, a network coding enabled cooperative network with multiple relays is considered, under Rayleigh fading. The outage probability of this network is analyzed and showed to be superior to the traditional network with multiple relays.

关键词： Relays network coding Protocols Signal to noise ratio Encoding Fading Wireless networks

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ANOC: Anonymous network-coding-Based Communication with Efficient Cooperation

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IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS 2012年第9期30卷 1738-1745页

作者： Zhang, Peng Lin, Chuang Jiang, Yixin Lee, Patrick P. C. Lui, John C. S. Tsinghua Univ Dept Comp Sci & Technol Beijing 100084 Peoples R China China So Power Grid Co Ltd Guangzhou Guangdong Peoples R China Chinese Univ Hong Kong Dept Comp Sci & Engn Hong Kong Hong Kong Peoples R China

Practical wireless network coding (e. g., COPE) is a promising technique that can enhance the throughput of wireless networks. However, such a technique also bears a serious security drawback: it breaks the current privacy-preserving protocols (e. g., Onion Routing), since their operations conflict each other. As user privacy in wireless networks is highly valued nowadays, a new privacy-preserving scheme that can function with wireless network coding becomes indispensable. To address such a challenge, we apply the idea of cooperative networking and design a novel anonymity scheme named ANOC, which can function in network-coding-based wireless mesh networks. ANOC is built upon the classic Onion Routing protocol, and resolves its conflict with network coding by introducing efficient cooperation among relay nodes. Using ANOC, we can perform network coding to achieve a higher throughput, while still preserving user privacy in wireless mesh networks. We formally show how ANOC achieves the property of relationship anonymity, and conduct extensive experiments via nsclick to demonstrates its feasibility and efficiency when integrated with network coding.

关键词： network coding anonymity cooperative networking Onion Routing

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Distributed rate allocation in P2P networks with inter-session network coding

Distributed rate allocation in P2P networks with inter-sessi...

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Packet Video

作者： Eirina Bourtsoulatze Nikolaos Thomos Pascal Frossard Signal Processing Laboratory (LTS4) Ecole Polytechnique Fédérale de Lausanne Lausanne Switzerland

In this paper, we propose a distributed rate allocation algorithm for delay minimal data delivery in overlay networks where multiple sources compete simultaneously for the available network resources. In order to efficiently utilize the network resources, we propose to use inter-session network coding. We devise a distributed algorithm that allows peers to determine the optimal coding combinations and the packet rates for each type of combinations to be requested from the parent peers. The rate allocation problem is formulated as a decoding delay minimization problem, where every peer seeks the rates that minimize the average expected delay of the peer and its children peers. To solve this non-convex optimization problem, we introduce the concept of equivalent packet flows, which permits to estimate the expected number of packets that every peer needs to collect for decoding. We then decompose our original rate allocation problem into a set of convex subproblems, which we eventually combine to obtain the solution to the delay minimization problem. The results demonstrate that the proposed scheme eliminates effectively the bottlenecks and reduces the delay time experienced by users with limited resources.

关键词： Peer to peer computing Delay Resource management Decoding Bandwidth network coding Optimization

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Diversity Analysis of Minimum Distance Based Relay Selection Schemes for Two-Way Relaying Systems with Physical network coding

Diversity Analysis of Minimum Distance Based Relay Selection...

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IEEE Conference on Vehicular Technology (VTC)

作者： Youngil Jeon Young-Tae Kim Changick Song Youn-Ok Park Inkyu Lee Electronics and Telecommunications Research Institute Daejeon South Korea Korea University Seongbuk-gu Seoul KR School of Electrical Engineering Korea University Seoul South Korea

A relay selection method is one of popular approaches to overcome fading effects in wireless relay channel due to its simplicity. However, previous works were concentrated on the case of analog network coding systems. In this paper, we consider a relay selection scheme in two-way relaying systems with physical network coding. Since conventional schemes based on analog network coding does not provide effective performance in physical network coded systems, we propose new selection criteria which maximize the minimum distance at the multiple access phase to achieve full diversity. Moreover, through asymptotic error rate analysis, it is confirmed that the proposed scheme is able to attain full diversity. Simulations results are also provided to verify the analysis of the proposed scheme.

关键词： Relays network coding Wireless communication Diversity methods Error probability Bit error rate Signal to noise ratio

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Analog network coding in general SNR regime: Performance of network simplification

Analog network coding in general SNR regime: Performance of ...

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

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

A communication scenario where a source communicates with a destination over a directed layered relay network is considered. Each relay performs analog network coding where it scales and forwards the signals received at its input. In this scenario, we address the question: What portion of the maximum end-to-end achievable rate can be maintained if only a fraction of relay nodes available at each layer are used? We consider, in particular, the Gaussian diamond network and a class of symmetric layered networks. For these networks we provide upper bounds on additive and multiplicative gaps between the optimal analog network coding performance when all N relays in each layer are used and when only k such relays are are used, k

关键词： Relays network coding Additives Signal to noise ratio Optimized production technology

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Anti Error Propagation Methods for Wireless Uplink Using network coding

Anti Error Propagation Methods for Wireless Uplink Using Net...

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IEEE Global Communications Conference

作者： Wei Guan K. J. Ray Liu Department of Electrical and Computer Engineering University of Maryland

ISBN: (纸本)9781467309202

Wireless network coding suffers the error propagation issues that may severely degrade the diversity performance. In this work, we develop two power scaling schemes at the relay side and two detection schemes at the receiver side, respectively, to mitigate error propagation in network-coded uplink channel and thus achieve full diversity. For the soft power scaling based link adaptive relaying, we develop a virtual channel model and demonstrate that the relay power should be such to balance the signal-to-noise ratios of the source-relay channel and relay-destination channel. As for the hard power scaling based ON-OFF relaying, we first design a decision rule based on total pairwise error probability, and then simplifies it to the threshold-based relaying strategy. At the receiver side, we show that the weighted minimum distance detection with the weight being determined by the relative link quality of source-relay channel and relay-destination channel can achieve full diversity once the global channel state information is available, otherwise the maximum likelihood detection that explicitly takes into account relay decoding error should be employed to achieve full diversity.

关键词： relay channel Error propagation Channel state information relaying decision rule up link Pairwise error probability relay maximum likelihood detection power scale signal to noise ratios network coding Scale formation Wireless networks

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Detection for physical-layer network coding: When perfect global CSI is not available

Detection for physical-layer network coding: When perfect gl...

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IEEE International Conference on Wireless Information Technology and Systems (ICWITS)

作者： Zhongyuan Zhao Xinqian Xie Mugen Peng Wireless Signal Processing and Network Laboratory Key Laboratory of Universal Wireless Communication Ministry of Education Beijing University of Posts and Telecommunications Beijing China

The existing PNC scheme is with coherent detection at the receivers, where the perfect global CSI is needed. To ensure that PNC can be implemented in practical two-way relaying systems, two detection schemes are presented in this paper, which are named as non-coherent detection and partial-coherent detection for PNC respectively. Specifically non-coherent detection requires for no CSI at the receivers. To further improve the detection performance, partial-coherent detection for PNC is introduced, where imperfect partial CSI can be obtained at the receivers by channel estimation. The decision rules for both two detection schemes are given in the paper, and the simulation results show that our proposed detection schemes are practical and efficient for PNC in Rayleigh fading channels.

关键词： Relays network coding Erbium Channel estimation Wireless communication Measurement Fading

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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...

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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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Performance analysis of adaptive physical layer network coding for wireless two-way Relaying

Performance analysis of adaptive physical layer network codi...

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Vijayvaradharaj T. Muralidharan B. Sundar Rajan Department of ECE IISc Bangalore India

The analysis of modulation schemes for the physical layer network-coded two way relaying scenario is presented which employs two phases: Multiple access (MA) phase and Broadcast (BC) phase. Depending on the signal set used at the end nodes, the minimum distance of the effective constellation seen at the relay becomes zero for a finite number of channel fade states referred as the singular fade states. The singular fade states fall into the following two classes: (i) the ones which are caused due to channel outage and whose harmful effect cannot be mitigated by adaptive network coding called the non-removable singular fade states and (ii) the ones which occur due to the choice of the signal set and whose harmful effects can be removed called the removable singular fade states. In this paper, we derive an upper bound on the average end-to-end Symbol Error Rate (SER), with and without adaptive network coding at the relay, for a Rician fading scenario. It is shown that without adaptive network coding, at high Signal to Noise Ratio (SNR), the contribution to the end-to-end SER comes from the following error events which fall as SNR -1 : the error events associated with the removable and nonremovable singular fade states and the error event during the BC phase. In contrast, for the adaptive network coding scheme, the error events associated with the removable singular fade states fall as SNR -2 , thereby providing a coding gain over the case when adaptive network coding is not used. Also, it is shown that for a Rician fading channel, the error during the MA phase dominates over the error during the BC phase. Hence, adaptive network coding, which improves the performance during the MA phase provides more gain in a Rician fading scenario than in a Rayleigh fading scenario. Furthermore, it is shown that for large Rician factors, among those removable singular fade states which have the same magnitude, those which have the least absolute value of the phase angle alone contrib

关键词： network coding Adaptive systems Signal to noise ratio Relays Rician channels Fading Clustering algorithms

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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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