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检索条件"主题词=network coding"

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BATS: network coding in action

BATS: Network coding in action

引用

Annual Allerton Conference on Communication, Control, and Computing

作者： Shenghao Yang Raymond W. Yeung Jay H. F. Cheung Hoover H. F. Yin Institute for Interdisciplinary Information Sciences Tsinghua University Beijing China Shenzhen Key Laboratory of Network Coding Key Technology and Application The Chinese University of Hong Kong Shenzhen China Institute of Network Coding The Chinese University of Hong Kong Hong Kong China

ISBN: (纸本)9781479980109

BATS code is a low-complexity random linear network coding scheme that can achieve asymptotic bandwidth optimality for many types of networks with packet loss. In this paper, we propose a BATS code based network protocol and evaluate the performance by real-device experiments. Our results demonstrate significant ready-to-implement gain of network coding over forwarding in multi-hop network transmission with packet loss. We also propose an improved protocol to handle the practical issues observed in the experiments.

关键词： Decoding Protocols Encoding network coding Packet loss Vectors

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Evaluation of multicasting schemes based on joint multiple description and network coding

Evaluation of multicasting schemes based on joint multiple d...

引用

IEEE Conference on Wireless Communications and networking

作者： Hamlet Medina Ruiz Lana Iwaza Michel Kieffer Béatrice Pesquet-Popescu Khaldoun Al Agha L2S Univ Paris-Sud Gif-sur-Yvette France CNRS LTCI Signal and Image Processing Department Télécom ParisTech Paris France LRI Univ Paris-Sud Orsay France

This paper considers a multicast scenario and compares the average reception quality obtained when combining multiple description coding (MDC) and network coding (NC). Plain (single description) network coding (NC-SDC) serves as reference. In the considered scenario, a single source is multicast to several receivers with various channel conditions. Contrary to a NC-SDC scheme, unable to recover the coded packets when not enough combinations of packets have been received, NC of MDC packets allows a more progressive quality improvement with the number of received packets, and a reduction of the effect of the quantization noise when MDC is performed via frame expansion before quantization. Considering a probability distribution for the bit transition probability during transmission to any user in the multicast group, the expected signal-to-noise ratio is evaluated. Performance comparisons are made for various error distributions, field sizes, and MDC methods (via frame expansion and correlating transform).

关键词： Signal to noise ratio Receivers Encoding Probability density function Quantization network coding Vectors

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Mitigation of Forwarding Misbehaviors in Multiple Access networks with network coding

Mitigation of Forwarding Misbehaviors in Multiple Access Net...

引用

2010 IEEE Global Telecommunications Conference GLOBECOM 2010

作者： Sang Wu Kim Department of Electrical and Computer Engineering Iowa State University Ames IA USA

We propose a physical layer approach to detect the relay node that injects false data or adds channel errors into the network encoder in multiple access relay networks. The misbehaving relay is detected by using the maximum a posteriori (MAP) detection rule which is optimal in the sense of minimizing the probability of incorrect decision (false alarm and miss detection). The proposed scheme does not require sending extra bits at the source, such as hash function or message authentication check bits, and hence there is no transmission overhead. The side information regarding the presence of forwarding misbehavior is exploited at the decoder to enhance the reliability of decoding. We derive the probability of false alarm and miss detection and the probability of bit error, taking into account the lossy nature of wireless links. We show that the proposed decoding with the aid of the MAP detection of misbehaving relay is within 1dB away from the genie-aided decoding.

关键词： Relays Decoding network coding Signal to noise ratio Peer to peer computing Wireless communication Reliability

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Adaptive network coding schemes for satellite communications

Adaptive network coding schemes for satellite communications

引用

Advanced Satellite Mobile Systems (ASMS)

作者： Ala Eddine Gharsellaoui Samah A. M. Ghanem Daniele Tarchi Alessandro Vanelli-Coralli Department of Electrical and Electronic Engineering University of Bologna Italy Huawei R&D Labs Stockholm Sweden

In this paper, we propose two novel physical layer aware adaptive network coding schemes for time variant channels, one aiming to maximize the energy efficiency, the other exploiting also the variable modulation order, in an adaptive way. The proposed schemes have been applied to different satellite communications scenarios with different Round Trip Times (RTT). Compared to adaptive network coding, and classical non-adaptive network coding schemes for time variant channels, used as benchmarks, the proposed schemes demonstrate that adaptation of packet transmission based on the channel variation and corresponding erasures allows for significant gains in terms of throughput, delay and energy efficiency. We shed light on the trade-off between energy efficiency and delay-throughput gains, demonstrating that conservative adaptive approaches that favor less transmission under high erasures, might cause higher delay and less throughput gains in comparison to non-conservative approaches that favor more transmission to account for high erasures.

关键词： network coding Adaptive systems Delays Throughput Wireless communication Receivers Modulation

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Optimization frameworks for wireless network coding under multi-hop node interference

Optimization frameworks for wireless network coding under mu...

引用

MILCOM, Military Communications Conference

作者： Chengyu Xiong Xiaohua Li Department of Electrical and Computer Engineering State University of New York Binghamton Binghamton NY USA

Based on an information model that classifies intermediate nodes in multicast networks into network coding, routing and replicating nodes, multicast max-flow and minimum cost optimization frameworks are formulated to solve optimization problems in wireless networks with or without network coding. Two special properties of wireless transmissions are taken into consideration, i.e., multi-hop cooperation and mutual interference among nodes. Using maximal ratio combining (MRC) for node cooperation and successive interference cancellation (SIC) for interference mitigation, signal-to-interference-plus-noise ratio (SINR) expressions for wireless nodes are derived. Such expressions are then used to modify the edge capacity in the optimization frameworks. The proposed method is helpful to the study of node cooperation and competition in multi-hop wireless communication networks.

关键词： Interference network coding Optimization Wireless networks Receivers Signal to noise ratio

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Analog network coding in nonlinear chains

Analog network coding in nonlinear chains

引用

IEEE Conference on Wireless Communications and networking

作者： Tulika Agrawal Samar Agnihotri Nalam V. Abhishek School of Computing and Electrical Engineering Indian Institute of Technology Mandi HP India

The problem of characterizing the optimal rate achievable with analog network coding (ANC) for a unicast communication over general wireless relay networks is computationally hard. A relay node performing ANC scales and forwards its input signals. The source-destination channel in such communication scenarios is, in general, an intersymbol interference (ISI) channel which leads to the single-letter characterization of the optimal rate in terms of an optimization problem with nonconvex, non closed-form objective function and non-convex constraints. For a special class of such networks, called layered networks, a few key results and insights are however available. To gain insights into the nature of the optimal solution and to construct low-complexity schemes to characterize the optimal rate for general wireless relay networks, we need (1) network topologies that are regular enough for analysis, yet general enough to capture essential characteristics of general wireless relay networks, and (2) schemes to approximate the objective function in closed-form without significantly compromising the performance. Towards these two goals, this work proposes (1) nonlinear chain networks, and (2) two approximation schemes. We show that their combination allows us to tightly characterize the optimal ANC rate with low computational complexity for a much larger class of general wireless relay networks than possible with existing schemes.

关键词： Approximation methods Relay networks (telecommunications) Delays Wireless communication network coding Conferences

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Joint channel decoding and physical-layer network coding in two-way QPSK relay systems by a generalized Sum-Product Algorithm

Joint channel decoding and physical-layer network coding in ...

引用

International Symposium on Wireless Communication Systems (ISWCS)

作者： Dirk Wübben Department of Communications Engineering University of Bremen Bremen Germany

A physical-layer network coded two-way relay system applying Low-Density Parity-Check (LDPC) codes for error correction is considered in this paper, where two sources A and B desire to exchange information with each other by the help of a relay R. The critical process in such a system is the calculation of the network-coded transmit word at the relay on basis of the superimposed channel-coded QPSK words of the two sources. For this joint channel-decoding and network-encoding task a generalized Sum-Product Algorithm (SPA) over F 16 is developed. This novel iterative decoding approach outperforms other recently proposed schemes as demonstrated by simulations.

关键词： Decoding Relays network coding Parity check codes Joints Phase shift keying Fading

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Sliding-Window Based Batch Forwarding using Intra-Flow Random Linear network coding

Sliding-Window Based Batch Forwarding using Intra-Flow Rando...

引用

International Wireless Communications and Mobile Computing Conference, IWCMC

作者： Sen Ma Xiulian Liu Yan Yan Baoxian Zhang Jun Zheng Research Center of Ubiquitous Sensor Networks University of Chinese Academy of Sciences Beijing China Astronaut Center of China Beijing China National Mobile Communications Research Laboratory Southeast University Nanjing Jiangsu China

ISBN: (数字)9781728131290

ISBN: (纸本)9781728131306

Batch forwarding using intra-flow random linear network coding (RLNC) has been used to improve the performance of a wireless network constituent of lossy links. However, existing batch-based forwarding mechanisms in this aspect can lead to a lot of bandwidth waste and thus reduced transmission efficiency. In this paper, we design a Sliding WIndow based Multiple batch forwarding mechanism (SWIM) using RLNC. In SWIM, multiple batches are allowed to be sent out simultaneously in a way that the forwarding process is managed by a sliding window. In SWIM, adaptive rate assignment is used to assign bandwidth resources to different batches based on their decoding states at the destination, in order to make full use of the bandwidth resources. Simulation results show that SWIM can achieve improved throughput performance as compared with existing work.

关键词： Bandwidth network coding Encoding Decoding Throughput Wireless networks

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A Unified Channel-network coding Treatment for User Cooperation in Wireless Ad-Hoc networks

A Unified Channel-Network Coding Treatment for User Cooperat...

引用

IEEE International Symposium on Information Theory

作者： Xingkai Bao Jing Li Department of Electrical and Computer Engineering Lehigh University Bethlehem PA USA

ISBN: (纸本)142440505X

We propose a combined channel-network coding solution for efficient user cooperation in wireless ad-hoc networks that comprise a host of terminals communicating to a common destination. The proposed framework, termed generalized adaptive network coded cooperation or GANCC, addresses the challenge of inter-user outage, which widely persists in practical cooperation scenarios, by adaptively matching code graphs to instantaneous network graphs (topologies). Additionally, GANCC treats channel codes as an integral part of the network code, and in doing so not only extracts the most benefit from these codes but also provides a live example supporting the notion that network codes are generalization of channel codes (as well as source codes)

关键词： Ad hoc networks Channel coding network coding Protocols Routing Adaptive systems network topology Fading Physical layer Parity check codes

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Enhance Wireless Security System Using Butterfly network coding Algorithm

Enhance Wireless Security System Using Butterfly Network Cod...

引用

International Conference on Applied Information Technology and Innovation (ICAITI)

作者： Zhi-Hao Wang Yu-Fan Kung Hendrick Po-Jen Cheng Chih-Min Wang Gwo-Jia Jong National Kaohsiung University of Science and Technology Kaohsiung City Kaohsiung Taiwan

ISBN: (纸本)9781538667279;9781538667262

The traditional security system requires a lot of manpower, and the wireless security system has been developed to reduce costs. However, for wireless systems, stability and reliability are important system indicators. In order to effectively improve these two indicators, we have imported butterfly network coding algorithm into the wireless sensing network. Because this algorithm enables each node to play multiple roles, such as routing, encoding, decoding, sending and receiving, it can also improve the throughput of network transmission, and effectively improve the stability and reliability of the wireless security system. This paper used the Wi-Fi module to implement the butterfly network coding algorithm, and is actually installed in the building. The basis for transmission and reception of all nodes in the network is received signal strength indication (RSSI). On the other hand, this is an IoT system for security monitoring.

关键词： network coding RSSI telecommunication security wireless LAN wireless sensor networks telecommunication security Received Signal Strength Indicator hypercube networks wireless local area network (WLAN) network coding Accidents,emergencies and safety Wireless sensor networks safety monitoring Manpower Labor Force

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