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network Coded Multicast over Multibeam Satellite Systems

MATHEMATICAL PROBLEMS IN ENGINEERING 2015年第1期2015卷 1-15页

作者： Alegre-Godoy, R. Vazquez-Castro, Andm. A. Autonomous Univ Barcelona Sch Engn Dept Telecommun & Syst Engn E-08193 Barcelona Spain

We propose a multicast scheme for multibeam satellite systems exploiting both the multiuser and spatial diversity inherent in this type of systems while taking into account realistic physical distributions of User Terminals (UTs) over the coverage. Our proposed scheme makes use of the well-known Adaptive coding and Modulation (ACM) feature in Digital Video Broadcasting over Satellite, 2nd Generation (DVB-S2) and Extension (DVB-S2X) standards but also incorporates a set of innovative features. First, multilink reception, that is, receivers that can syntonize different frequencies and/or polarizations, together with network coding (NC) is used to enable decoding of signals from adjacent beams (spatial diversity). Second, efficient and fair allocation of resources is achieved through Proportionally Fair Multicast (PFM) scheduling. Our results, obtained over realistic nonuniform UTs distributions, show average system multicast throughput gains up to 88% with regard to state-of-the-art multicast schemes. Furthermore, a complete cross-layer architecture is proposed, fully compliant with the standard providing Quality of Service (QoS) guarantees.

关键词： MULTIBEAM antennas NATURAL satellites linear network coding MULTICASTING (Computer networks) COMPUTER architecture

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OFDMA-based network-coded cooperation: design and implementation using software-defined radio nodes

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EURASIP JOURNAL ON ADVANCES IN SIGNAL PROCESSING 2016年第1期2016卷 1页

作者： Gokceli, Selahattin Alakoca, Hakan Basaran, Semiha Tedik Kurt, Gunes Karabulut Istanbul Tech Univ Dept Elect & Commun Engn Wireless Commun Res Lab TR-80626 Istanbul Turkey

Benefits of network coding towards enhancing communication quality, both in terms of robustness or data transmission rates, make it a significant candidate as a future networking technology. Conventionally, network coding is mostly used in wired infrastructures, where transmission errors between nodes are negligible. Capturing the provided benefits of network coding via straightforward extension from wired networks to wireless networks is not trivial. In addition to the challenges introduced through the wireless channel impairments, we can also capture the spatial diversity gain provided by the broadcast nature of the wireless channels. In this work, we design and implement a network-coded cooperation (NCC) system that operates in real time through the use of software-defined radio (SDR) nodes for the first time in the literature. We specifically target wireless networks. Our system is based on orthogonal frequency division multiple access (OFDMA) that provides a practical means to enable high transmission rates through the use of narrowband subcarriers. The developed testbed is composed of three source nodes, a relay node and two destination nodes. The transmission of the proposed NCC-OFDMA system is completed in two phases;the broadcast and the relaying phases. Multiplexing of source nodes' signals is achieved through OFDMA technique. In the broadcast phase, an OFDMA signal is transmitted to relay and destination nodes. In the relaying phase, the relay node first detects the OFDMA signal, generates network-coded symbols, and then transmits these symbols to destination nodes. At the end of these two phases, the destination nodes determine the source nodes' signals by using network decoders. The destination nodes make use of both the uncoded and network-coded symbols, which are received in broadcast and relaying phases, respectively. Destination nodes then perform network decoding. Through real-time bit error rate and error vector magnitude measurements, we show tha

关键词： Orthogonal frequency division multiple access network-coded cooperation Software-defined radio linear network coding

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Stochastic policy-based wireless energy harvesting in green cognitive radio network

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EURASIP JOURNAL ON WIRELESS COMMUNICATIONS AND networkING 2015年第1期2015卷 1页

作者： Oh, Hayoung Ran, Rong Soongsil Univ Dept Elect & Informat Engn Seoul South Korea Ajou Univ Dept Elect & Comp Engn Suwon 441749 South Korea

With the rapid increase of energy consumption and environment problems, the need for green techniques and harvesting energy is emerging. network coding can provide the solution by the reduction of the unnecessary data transmission and the estimated traffic patterns. It can also amplify the synergy in an energy harvesting capable cognitive radio (CR) network since the CR has the recognition and optimal decision functionalities. In this paper, we propose stochastic policy based wireless energy harvesting in green cognitive radio network. With the simulations, we show that the proposed scheme is better up to 20 % of the previous work.

关键词： Green cognitive radio network Analog network coding linear network coding

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Utility Maximization for Multihop Wireless networks Employing BATS Codes

IEEE JOURNAL ON SELECTED AREAS IN INFORMATION THEORY

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IEEE JOURNAL ON SELECTED AREAS IN INFORMATION THEORY 2021年第4期2卷 1120-1134页

作者： Dong, Yanyan Jin, Sheng Chen, Yanzuo Yang, Shenghao Yin, Hoover H. F. Chinese Univ Hong Kong Shenzhen Sch Sci & Engn Shenzhen 518172 Peoples R China Carnegie Mellon Univ Informat Networking Inst Pittsburgh PA 15213 USA Chinese Univ Hong Kong Shenzhen Sch Sci & Engn Shenzhen 518172 Peoples R China Chinese Univ Hong Kong Shenzhen Shenzhen Key Lab IoT Intelligent Syst & Wireless Shenzhen 518172 Peoples R China Shenzhen Res Inst Big Data Shenzhen 518172 Peoples R China N Hop Technol Ltd Hong Kong Peoples R China Chinese Univ Hong Kong Inst Network Coding Hong Kong Peoples R China

BATS (BATched Sparse) codes are a class of efficient random linear network coding variation that has been studied for multihop wireless networks mostly in scenarios of a single communication flow. Towards sophisticated multi-flow network communications, we formulate a network utility maximization (NUM) problem that jointly optimizes the BATS code parameters of all the flows and network scheduling. The NUM problem adopts a batch-wise packet loss model that can be obtained from the network local statistics without any constraints on packet loss patterns. Moreover, the NUM problem allows a different number of recoded packets to be transmitted for different batches in a flow, which is called adaptive recoding. Due to both the probably nonconcave objective and the BATS code-related variables, the algorithms developed for the existing flow optimization problems cannot be applied directly to solve our NUM problem. We introduce a two-step algorithm to solve our NUM problem, where the first step solves the problem with nonadaptive recoding schemes, and the second step optimizes adaptive recoding hop-by-hop from upstream to downstream in each flow. We perform various numerical evaluations and simulations to verify the effectiveness and efficiency of the algorithm.

关键词： linear network coding batched network codes wireless networks utility maximization

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Tree Analysis of BATS Codes

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IEEE COMMUNICATIONS LETTERS 2016年第1期20卷 37-40页

作者： Yang, Shenghao Zhou, Qiaoqiao Chinese Univ Hong Kong Sch Sci & Engn Shenzhen 518172 Peoples R China Chinese Univ Hong Kong Inst Network Coding Shatin Hong Kong Peoples R China

BATS codes are a class of efficient random linear network codes. In this letter, BATS codes are generalized to incorporate batches of different sizes, and the corresponding belief propagation (BP) decoding performance is studied. Using a tree-based analysis, a sufficient condition is obtained such that the BP decoder can recover a given fraction of the input symbols with high probability. Some assumptions in the previous works are relaxed in our analysis so that the analytical results can be applied to more general scenarios.

关键词： linear network coding BATS code belief propagation tree analysis

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Vector linear Solution iff Dimension ≥ m

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IEEE COMMUNICATIONS LETTERS 2019年第9期23卷 1470-1473页

作者： Das, Niladri Rai, Brijesh Kumar IIT Guwahati Dept Elect & Elect Engn Gauhati 781039 India

If a network has an m-dimensional vector linear network coding (VLNC) solution, then it also has a VLNC solution for all dimensions multiple of m;but can a VLNC solution exists for dimensions not a multiple of m? If m is the least positive integer such that a network has an m-dimensional VLNC solution, none of the networks shown in the literature has a VLNC solution for a dimension which is not a multiple of m. In this letter, we show that for any positive integer m >= 3, there exists a network which has no vector linear solution if the dimension is less than m - 1 but has a vector linear solution for all dimensions greater than or equal to m - 1.

关键词： linear network coding scalar linear solution vector linear solution message dimension M-network

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Editorial: Mobile networks and Management

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MOBILE networkS & APPLICATIONS 2016年第4期21卷 561-563页

作者： Aguro, Ramon Zinner, Thomas Garcia-Lozano, Mario Wenning, Bernd-Ludwig Timm-Giel, Andreas Univ Cantabria Commun Engn Dept Santander Spain Univ Wurzburg Chair Commun Networks Wurzburg Germany Univ Wurzburg Chair Commun Networks Res Grp Next Generat Networks Wurzburg Germany Tech Univ Catalunya Barcelona Spain Cork Inst Technol Nimbus Ctr Cork Ireland Hamburg Univ Technol Hamburg Germany

An introduction is presented in which the editor discusses various reports within the issue on topics including mobile edge computing, power consumption for mobile devices, and optimised joint network coding for senso... 详细信息

关键词： MOBILE computing ENERGY consumption linear network coding

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On BATS Codes With Variable Batch Sizes

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IEEE COMMUNICATIONS LETTERS 2017年第9期21卷 1917-1920页

作者： Zhou, Qiaoqiao Yang, Shenghao Yin, Hoover H. F. Tang, Bin Chinese Univ Hong Kong Inst Network Coding Shatin Hong Kong Peoples R China Chinese Univ Hong Kong Sch Sci & Engn Shenzhen 518172 Peoples R China Nanjing Univ Natl Key Lab Novel Software Technol Nanjing 210023 Jiangsu Peoples R China

BATS codes are a class of low complexity random linear network codes with high throughput. In a previous work, BATS codes were generalized to incorporate batches of different sizes, and a sufficient condition was obtained such that the belief propagation decoding can recover a given fraction of the input packets with high probability. In this letter, by investigating an optimization problem induced by the sufficient condition, we derive a condition such that it is optimal to use a constant batch size. This condition gives us a guideline for designing practical network protocol based on BATS codes. Moreover, we prove that this condition is always satisfied in line networks.

关键词： linear network coding BATS codes batch size line networks

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Pattern Completion in Symmetric Threshold-linear networks

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NEURAL COMPUTATION 2016年第12期28卷 2825-2852页

作者： Curto, Carina Morrison, Katherine Penn State Univ Dept Math University Pk PA 16802 USA Univ Northern Colorado Sch Math Sci Greeley CO 80639 USA

Threshold-linear networks are a common class of firing rate models that describe recurrent interactions among neurons. Unlike their linear counterparts, these networks generically possess multiple stable fixed points (steady states), making them viable candidates for memory encoding and retrieval. In this work, we characterize stable fixed points of general threshold-linear networks with constant external drive and discover constraints on the coexistence of fixed points involving different subsets of active neurons. In the case of symmetric networks, we prove the following antichain property: if a set of neurons is the support of a stable fixed point, then no proper subset or superset of can support a stable fixed point. Symmetric threshold-linear networks thus appear to be well suited for pattern completion, since the dynamics are guaranteed not to get stuck in a subset or superset of a stored pattern. We also show that for any graph G, we can construct a network whose stable fixed points correspond precisely to the maximal cliques of G. As an application, we design network decoders for place field codes and demonstrate their efficacy for error correction and pattern completion. The proofs of our main results build on the theory of permitted sets in threshold-linear networks, including recently developed connections to classical distance geometry.

关键词： FIXED point theory linear network coding ERROR correction (Information theory) NEURONS INFORMATION retrieval

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Any network code comes from an algebraic curve taking osculating spaces

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DESIGNS CODES AND CRYPTOGRAPHY 2014年第3期73卷 1023-1026页

作者： Ballico, Edoardo Univ Trento Dept Math I-38123 Povo TN Italy

In this note we prove that every network code over may be realized taking some of the osculating spaces of a smooth projective curve.

关键词： linear network coding Algebraic curve Osculating space

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