scholarly journals An Irregular Graph Based Network Code for Low-Latency Content Distribution

Sensors ◽  
2020 ◽  
Vol 20 (15) ◽  
pp. 4334
Author(s):  
Weiwei Yang ◽  
Ye Li
Keyword(s):  
Belief Propagation ◽  
Content Distribution ◽  
Optimization Problems ◽  
Transmission Rate ◽  
Network Code ◽  
Low Latency ◽  
Design Generation ◽  
Network Transmission ◽  
Increasing Demand ◽  
Transmission Overhead

To fulfill the increasing demand on low-latency content distribution, this paper considers content distribution using generation-based network coding with the belief propagation decoder. We propose a framework to design generation-based network codes via characterizing them as building an irregular graph, and design the code by evaluating the graph. The and-or tree evaluation technique is extended to analyze the decoding performance. By allowing for non-constant generation sizes, we formulate optimization problems based on the analysis to design degree distributions from which generation sizes are drawn. Extensive simulation results show that the design may achieve both low decoding cost and transmission overhead as compared to existing schemes using constant generation sizes, and satisfactory decoding speed can be achieved. The scheme would be of interest to scenarios where (1) the network topology is not known, dynamically changing, and/or has cycles due to cooperation between end users, and (2) computational/memory costs of nodes are of concern but network transmission rate is spare.

Application of Power Communication System in Wind Power Plant

2013 ◽  
Vol 724-725 ◽  
pp. 655-658
Author(s):  
Rui Jing Shi ◽  
Xiao Chao Fan ◽  
Feng Ting Li ◽  
Bo Wei
Keyword(s):  
Wireless Communication ◽  
Wind Power ◽  
Communication System ◽  
Transmission Rate ◽  
Wind Farms ◽  
Optical Fiber Communication ◽  
Total System ◽  
Fiber Communication ◽  
Network Transmission ◽  
Cable Communication

The application of power communication system in the field of wind power mainly includes the overall system communication and local field communication. During the operation of wind farms, the total system requires that the electric power communication system should provide reliable rapid information channel, accuracy of transmission on a variety of digital business. This article will focus on the application of power communication system between the wind turbine and the booster station, which includes optical fiber communication, communication and leased public circuit, as well as the cable communication, wireless communication, microwave wireless communication. Finally, in the premise of various communications comparison, according to the actual situation of the wind power field, the network transmission rate and reliability should be considered to the requirements of power market.

Low-Latency Reweighted Belief Propagation Decoding for LDPC Codes

2012 ◽  
Vol 16 (10) ◽  
pp. 1660-1663 ◽  
Author(s):  
Jingjing Liu ◽  
Rodrigo C. de Lamare
Keyword(s):  
Belief Propagation ◽  
Ldpc Codes ◽  
Low Latency

scholarly journals Beyond Trees: Analysis and Convergence of Belief Propagation in Graphs with Multiple Cycles

2020 ◽  
Vol 34 (05) ◽  
pp. 7333-7340
Author(s):  
Roie Zivan ◽  
Omer Lev ◽  
Rotem Galiki
Keyword(s):  
Graphical Models ◽  
Belief Propagation ◽  
Optimization Problems ◽  
Optimal Solution ◽  
Damping Factor ◽  
Constraint Optimization ◽  
Single Cycle ◽  
Distributed Constraint Optimization ◽  
Multiple Cycles ◽  
Constraint Optimization Problems

Belief propagation, an algorithm for solving problems represented by graphical models, has long been known to converge to the optimal solution when the graph is a tree. When the graph representing the problem includes a single cycle, the algorithm either converges to the optimal solution or performs periodic oscillations. While the conditions that trigger these two behaviors have been established, the question regarding the convergence and divergence of the algorithm on graphs that include more than one cycle is still open.Focusing on Max-sum, the version of belief propagation for solving distributed constraint optimization problems (DCOPs), we extend the theory on the behavior of belief propagation in general – and Max-sum specifically – when solving problems represented by graphs with multiple cycles. This includes: 1) Generalizing the results obtained for graphs with a single cycle to graphs with multiple cycles, by using backtrack cost trees (BCT). 2) Proving that when the algorithm is applied to adjacent symmetric cycles, the use of a large enough damping factor guarantees convergence to the optimal solution.

scholarly journals Downlink and Uplink Cooperative Transmission for Primary Secrecy Based Cognitive Radio Sensor Networks

2015 ◽  
Vol 2015 ◽  
pp. 1-14
Author(s):  
Dawei Wang ◽  
Pinyi Ren ◽  
Qinghe Du ◽  
Li Sun ◽  
Yichen Wang
Keyword(s):  
Cognitive Radio ◽  
Sensor Networks ◽  
Optimization Problems ◽  
Transmission Rate ◽  
Cooperative Relaying ◽  
Cooperative Transmission ◽  
Primary System ◽  
Transmit Power ◽  
Cognitive Radio Sensor Networks ◽  
Secure Transmission

Aiming at allocating more licensed spectrum to wireless sensor nodes (SNs) under the constraint of the information security requirement of the primary system, in this paper, we propose a cooperative relaying and jamming secure transmission (CRJS) scheme in which SNs will relay primary message and jam primary eavesdrop concurrently with SN’s downlink and uplink information transmission in cognitive radio sensor networks (CRSNs). In our proposed CRJS scheme, SNs take advantages of physical layer secure technologies to protect the primary transmission and acquire some interference-free licensed spectrum as a reward. In addition, both decode-and-forward (DF) and amplify-and-forward (AF) relaying protocols are investigated in our proposed CRJS scheme. Our object is to maximize the transmission rate of SNs by optimal allocating of the relaying power, jamming power, and downlink and uplink transmit power under the target secure transmission rate requirement of the primary system. Moreover, two suboptimal algorithms are proposed to deal with these optimization problems. Furthermore, we analyze the transmission rate of SNs and allocate the relaying power, jamming power, and downlink and uplink transmit power for the asymptotic scenarios. Simulation results demonstrate the performance superiority of our developed strategy over conventional jamming scheme in terms of the transmission rate of WSN.

An Efficient Framework for Network Code based Multimedia Content Distribution in Hybrid P2P Network

2019 ◽  
Vol 29 (10) ◽  
pp. 2050157
Author(s):  
M. Anandaraj ◽  
P. Ganeshkumar ◽  
K. Selvaraj ◽  
K. P. Vijayakumar
Keyword(s):  
Network Coding ◽  
Content Distribution ◽  
Network Code ◽  
Coding System ◽  
Topology Change ◽  
Good Reliability ◽  
Coding Scheme ◽  
Stated Problem ◽  
Hybrid P2p ◽  
Multimedia Content Distribution

Most of the existing peer-to-peer (P2P) content distribution schemes carry out a random or rarest piece first content dissemination procedure to avoid duplicate transmission of the same pieces of data and rare pieces of data occurring in the network. This problem is solved using P2P content distribution based on network coding scheme. Network coding scheme uses random linear combination of coded pieces. Hence, the above-stated problem is solved easily and simply. Our proposed mechanism uses network coding mechanism in which several contents having the same message are grouped into different groups and coding operation is performed only within the same group. The interested peers are also divided into several groups with each group having the responsibility to spread one set of contents of messages. The coding system is designed to assure the property that any subset of the messages can be utilized to decode the original content as long as the size of the subset is suitably large. To meet this condition, dynamic smart network coding (DSNC) scheme is defined which assures the preferred property, then peers are connected in the same group to send the corresponding message, and connect peers in different groups to disseminate messages for carrying out decoding operation. Moreover, the proposed system is readily expanded to support topology change to get better system performance further in terms of reliability, link stress and throughput. The simulation results prove that the proposed system can attain 20–25% higher throughput than existing systems, good reliability, link failure and robustness to peer churn.

WiMAX Role on CBTC Systems

2007 ◽  
Author(s):  
Marina Aguado ◽  
Oscar Onandi ◽  
Eduardo Jacob ◽  
Christian Pinedo ◽  
Purificacion Saiz ◽  
...  
Keyword(s):  
Control Systems ◽  
Mobile Technology ◽  
Network Architecture ◽  
Communication Systems ◽  
High Speed ◽  
Transmission Rate ◽  
Discrete Event ◽  
Multipath Fading ◽  
Low Latency ◽  
Mobile Telecommunications

The recent progresses in mobile telecommunications technologies have allowed railway telecommunications technology to go a step forward, and, in the same way, the railway control systems. In this sense, while the mobile telecommunications technology evolved from the first generation of analogue mobile communication systems to what is known today as B3G (Beyond 3G), the same occurred with the telecommunication systems used in railways, from those based on analogue telecommunications, to the most recent ones based on 2G such as GSM-R or TETRA. Till recently, there was a technological gap regarding high mobility environments, high transmission rate and high interactivity (low latency). However, new emerging telecommunications technologies have shortened this gap significantly. This way, the train control systems will be affected by the availability of telecommunications technologies capable of offering earth-train broadband communications in real time. This article presents a telecommunications network architecture based on WiMAX (Worldwide Interoperability for Microwave Access) mobile technology (IEEE 802.16e) that fulfils the telecommunications needs in the railway environment. The WiMAX mobile technology most relevant features are: transmission rates up to 30Mbps at 15 km distance; mobility support up to 200km/h; QoS, security, low latency, fast, scalable and cost effective deployment, mainly compared to GSM-R deployment. In the mobile node design of this network telecommunications architecture, the multipath fading effect, and the Doppler effect, present in high speed mobility scenarios, have been taken into account. An improvement in the handoff between BSs, through a neighbouring and predictive mobility algorithm, is included. The architecture proposed supports the functional and system requirements identified in the UIC Project EIRENE (European Integrated Railway Radio Enhanced Network), and demanded to GSM-R technology. Measures on a real testbed and a model developed with the discrete event simulation tool, Opnet, have been employed in this work.

Large Volume Urban Train Security Detection Sensor Network Structure

2013 ◽  
Vol 303-306 ◽  
pp. 251-254 ◽  
Author(s):  
Xiao Yang Yao ◽  
De Qiang He ◽  
Jian Xiao Chen ◽  
Guo Liang He
Keyword(s):  
Communication Network ◽  
Fault Diagnosis ◽  
Sensor Network ◽  
Large Volume ◽  
Transmission Rate ◽  
Video Data ◽  
Construction Technology ◽  
Intelligent Maintenance ◽  
Network Transmission ◽  
Train Communication Network

There are large number of mechanical, electrical and auxiliary devices, and many sensors and intelligent nodes in urban train. The coupling relationship among onboard nodes becomes more and more complex, and various safety detection and information system demand train communication network higher performance. All of these variations need security detection sensor network which has high real-time, bandwidth and interoperability, good maintainability and expansibility. As the existing train communication network transmission rate is low, large capacity status and fault diagnosis data, the event log data, audio and video data which are stored in different vehicles equipments, and cannot be efficient and timely processing. So, it is difficult to realize the information transmission and processing, fault diagnosis and intelligent maintenance of train set. Based on the train level and vehicle level Ethernet network, this paper will focus on network construction technology of large volume onboard security detection sensor network. The research results will help to improve performance of urban train.

Research on Multimedia Business Network Architecture Based on Distributed IP Technology

2014 ◽  
Vol 556-562 ◽  
pp. 5680-5684
Author(s):  
Ya Qi Li ◽  
Jia Guo
Keyword(s):  
Network Structure ◽  
Network Architecture ◽  
Transmission Rate ◽  
Business Network ◽  
Site Structure ◽  
Network Transmission ◽  
Business Web ◽  
Business Site ◽  
Transmission Speed

Multimedia business network architecture is to raise the transmission rate of multimedia information, reduce the delay characteristics of the transmission process, so the multimedia service website can operate fast, reliable. In this paper we use multiple distributed IP technology to design the multimedia business network structure of IPV6. In order to verify the performance of network structure, we use IPerf software to test the performance of IPV6 multimedia business web site, and compare the performance of network under different distributed IP. By contrast, the network transmission speed of the multi distributed IPV6 is highest, delay characteristics are the shortest; and the distributed IPV6 is secondary; the worst is the general distributed IP. The transmission rate is 2.32 M/s; network delay characteristics can reach 232.21 ms, which verifies the important role of distributed IP in the multimedia business site structure. It provides technical support for the study of multimedia network.

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