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International conference on Advanced communication Technology (ICACT)

作者： Sung-Hei Kim Chang-Kyu Lee Shin-Gak Kang Electronics and Telecommunications Research Institute Daejeon South Korea

Although the IP multicast can be solution for various new emerging services which require active participation from many users, it does not work well in the current Internet which is based on the unicast communications [5]. Various alternative methods are being developed to overcome this limitation of the current Internet. One such method is an overlay multicast method. Most overlay multicast uses bi-directional TCP connection between the end-systems. Although TCP guarantees the ordered sequence and reliable transmission, TCP does not satisfy all properties of the overlay multicast in viewpoint of reliable transmission which includes establishment of new connection from new end-system. This paper introduces reliable data delivery scheme for relay-based overlay multicast. The proposed method is based on the architecture for n-plex multicast service which realizes simultaneous communication between multiple senders and multiple receivers [1][2].

关键词： Relays IP networks Web and internet services Unicast Telecommunication network reliability Bidirectional control Data communication TCPIP IPTV Peer to peer computing

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Study of Filter-based Neuromorphic Photonic Reservoir Computing for Signal Equalization in 224Gbps Sub-carrier Modulation IM-DD Short Reach optical Fiber communication System

Study of Filter-based Neuromorphic Photonic Reservoir Comput...

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Optoelectronics Global conference (OGC)

作者： Penghao Luo An Yan Aolong Sun Guoqiang Li Sizhe Xing Jianyang Shi Ziwei Li Chao Shen Junwen Zhang Nan Chi Department of Communication Science and Engineering Key Laboratory for Information Science of Electromagnetic Waves (MoE) Fudan University Shanghai China Peng Cheng Laboratory Shenzhen China

ISBN: (纸本)9781665486996

The ever-increasing requirements for bandwidth in edge places higher demands on the transmission capacity and data rate of short-reach intensity-modulation and direct-detection (IM/DD) optical fiber communication systems. Advanced digital signal processing (DSP), such as neural network (NN), is verified to be a good way to improve system performance, but the complicated DSP process always means high power consumption and slow processing speed. Reservoir Computing (RC) is a machine learning algorithm suitable for time-series-based problem, which has a faster computing speed than recurrent NN (RNN). The inherent randomness of RC makes us find its potential of signal equalization in all-optical domain. In this paper, we numerically studied a neuromorphic photonic RC signal processing scheme in IM/DD system with low hardware complexity, and realize the all-optical RC through two sets of optical filter nodes. Subcarrier modulation (SCM) signal is applied to study the filter-based neuromorphic photonic RC scheme, in comparison to traditional equalization methods. Simulation results show that the photonic RC equalization can bring orders of magnitude improvement in BER over traditional schemes, and the performances of different Quadrature Amplitude Modulation (QAM) formats are also studied. Finally, the architecture implementation of photonics RC for 224Gbps SCM signal over 80km standard single-mode fiber (SSMF) transmission in C-band is numerically demonstrated.

关键词： optical fibers Neuromorphics Quadrature amplitude modulation Simulation Modulation Digital signal processing Reservoirs

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TIGR in Iraq and Afghanistan: network-adaptive distribution of media rich tactical data

TIGR in Iraq and Afghanistan: Network-adaptive distribution ...

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MILCOM, Military communications conference

作者： Benjamin J. Ewy Michael T. Swink Steven G. Pennington Joseph B. Evans Jin M. Kim Chun Ling Samuel L. Earp Mari Maeda Ascend Intelligence LLC Arlington VA USA University of Kansas Lawrence KS USA Multisensor Science LLC Ellicott MD USA Defense Advanced Research Project Agency Arlington VA USA

ISBN: (纸本)9781424452385

The Tactical Ground Reporting (TIGR) system provides a unique multimedia patrol preparation and debriefing tool tailored to the needs of the patrol leader, and is used by all U.S. Army brigades in Iraq and Afghanistan. The distribution of data from geographically dispersed patrols requires network awareness and policy flexibility. The TIGR system utilizes an application overlay on to the tactical network that is tailored to the distribution of rich media. This architecture results in the theater-wide replication of compressed reports and meta-data, while the storage of full-quality media is distributed to the node closest to where the media was created. Thumbnail and other compressed media representations are replicated according to policy to meet soldier needs. Full-quality media can be accessed on demand from any location in the network. network utilization is controlled by a policy-based content subscription system, a priority queuing mechanism, and the discrete scheduling of network traffic. In this paper, we focus on the requirements for media rich tactical applications, detail a system that meets those requirements, and discuss experiences using TIGR in theater.

关键词： Bandwidth Intelligent networks Subscriptions Global Positioning System Cities and towns Multimedia systems Lead control systems communication system traffic control Traffic control

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Research on Key Distribution and Encryption control System of optical network Physical Layer

Research on Key Distribution and Encryption Control System o...

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World Congress on Computing and communication Technologies (WCCCT)

作者： Cui Chen Yang Zhe Yang Siyu Cheng Tao Jiang Liqiong Wang Xiangqing Yunnan Electric Power Dispatching Control Center State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing China

With the wide application of large-capacity and high-speed optical networks, its security has become a current research focus. Due to the limitations of traditional key distribution and encryption schemes, this paper proposes an innovative key distribution and encryption control scheme based on physical layer channel feature extraction and analysis. First of all, the transceiver terminal extracts the physical characteristics of the fiber channel separately, and generates a consensus key through quantization coding. Second, use the generated key base to encrypt the transmission sequence, map the Quadrature Phase Shift Keying (QPSK) signal to the high-order 1024×1024-QAM signal, and use the noise stream to perform the high-order QAM. The signal is flooded. The system utilizes channel non-replication and randomness of channel noise, the security and randomness of the key are good, and the key formation rate is high and the key generation equipment is simple. The system uses high-order QAM modulation, which increases the security of the system. The experimental results show that the coding rate of the key generated by the system reaches 400kb/s, and the coding performance of the key is better; the operating key is generated by the key base extension, which has strong anti-interception ability; the system has a low bit error rate and secure transmission Good performance.

关键词： Quantization (signal) Quadrature amplitude modulation Modulation optical fiber networks Physical layer security Feature extraction control systems

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Optimizing Energy Efficiency in Sensor networks with the Virtual Power Routing Scheme (VPRS)

Optimizing Energy Efficiency in Sensor Networks with the Vir...

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Augmented Intelligence and Sustainable systems (ICAISS), International conference on

作者： Swaminathan K Vijay Ravindran Ram Prakash Ponraj Vijayasarathi N Vasanth Prakash M Bharanidharan K Electronics and Communication Engineering University College of Engineering Pattukottai India Electrical and Electronics Engineering Saranathan College of Engineering Trichy India Electrical and Electronics Engineering Chettinad College of Engineering and Technology Karur India Electrical and Electronics Engineering Dr.NGP Institute of Technology Coimbatore India

In the wireless networks where the nodes have limited power sources and are unable to recharge or use alternative power backup. In such networks, conserving energy becomes a critical aspect to enhance the overall network lifetime. To achieve energy optimization, the proposed architecture introduces three types of nodes: leaf nodes, router nodes, and supervisor nodes. These nodes work together to optimize energy consumption based on the services they are assigned. For example, some nodes may act as leaf nodes, which are responsible for specific tasks, while others may function as router nodes to transfer packets, and supervisor nodes play a coordinating role. The energy optimization methods primarily target reducing the number of retransmissions within the network. Retransmissions can be energy-consuming, and by minimizing them, the network can save power and extend its lifetime. Another aspect of the optimization is efficiently updating control messages for all sensor nodes. Effective control message updates can lead to better coordination and reduced energy wastage. Two methods are proposed for identifying the shortest route between source and receiver nodes. The first method involves dividing the network structure, referred to as the partition process, to calculate the shortest path. The second method focuses on creating a path with low delay and targeting nodes with higher energy levels. This ensures that the data is transmitted through energy-rich nodes, reducing the overall energy consumption during data transfer. The central component of the proposed solution is the Virtual Power Routing Scheme (VPRS). VPRS aims to upgrade control notifications to all adjacent nodes without requiring response information from them. By efficiently distributing control information, the network can optimize power usage and improve overall performance.

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FWM effect in FTTH over DWDM for 320 Gbps link distance 80 km

FWM effect in FTTH over DWDM for 320 Gbps link distance 80 k...

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International conference on Computer and communication Engineering, ICCCE

作者： Sh. Fatimah Tuanku Abdullah Sakena Abdul Jabar Network Delivery Sarawak Telekom Malaysia Kuching Sarawak Malaysia Faculty of Engineering Universiti Malaysia Sarawak Kuching Sarawak Malaysia

We investigate the FWM impacts in FTTH over DWDM system. Even above SBS threshold, FWM was found to be available at lower launched power, inducing low cross-talk in this DWDM-PON. Nominal central frequencies for dense WDM systems based on 12.5 GHz anchored to the 193.1 THz reference. Thus dependency of channel spacing of 12.5 GHz, 25 GHz, 50 GHz and 100 GHz spaced DWDM-PON at a OLT-ONU link distance of 80 km are the focus area of our investigations. The nonlinearity effect of FWM on the performance of DWDM all optical star networks is being demonstrated in terms of Q-factor. The results are presented in graphical forms using practical parameters values at bit rates of 320 Gb/s. Simulation shows that the launched power is increased up to 10 dB with signal format of NRZ are used. It is demonstrated that waveform distortion due to FWM among different carriers in DWDM becomes deterministic by narrow channel spacing of 12.5 GHz and launched power less than 1 dBm.

关键词： optical fibers Wavelength division multiplexing Fiber nonlinear optics optical refraction optical variables control

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ASYNCHRONOUS TRANSFER MODE (ATM) OPERATION VIA SATELLITE - issues, CHallENGES AND RESOLUTIONS

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INTERNATIONAL JOURNAL OF SATELLITE communicationS 1994年第3期12卷 211-222页

作者： CHITRE, DM GOKHALE, DS HENDERSON, T LUNSFORD, JL MATHEWS, N COMSAT Laboratories 22300 Comsat Drive Clarksburg MD 20871 USA. Received his B.Sc. from the University of Bombay India an M.A. in mathematics from the University of Cambridge U.K. and a Ph.D. in physics from the University of Maryland. He is currently an Associate Executive Director of the Network Technology Division at COMSAT Laboratories. He has been involved in research and development activities in ISDN VSAT networks data communications and network systems and architectures. Prior to his current positions Dr. Chitre was a Principal Scientist in the Network Technology Division at COMSAT Laboratories. Dr. Chitre joined COMSAT Laboratories in 1980. He has made major contributions to the analysis and architecture of data communication ISDN and BISDN via satellite. Dr. Chitre directs and participates in the international and national standards activities in ISDN BISDN and data communication as they apply to satellite communication. He was Chairman of the Working Group on Protocols and Network Timing Function of the CCIR/CCITT Joint Ad Hoc Group on ISDN-Satellite Matters during 1990–1992. Currently he is the Chairman of the Working Group on New Technologies in the ITU Intersector Coordinating Group (ICG) on Satellite Matters. Dr. Chitre was a programme manager during 1990 and 1991 on a contract from INTELSAT on systems studies on satellite communications systems architectures for ISDN and broadband ISDN systems. Currently he is the technical manager of the DoD Contract on ATM via satellite demonstration and the programme manager for the INTELSAT contract on analysis and top-level specification of INTELSAT ISDN subnetworks and SDH compatible transport network. Department manager for ISDN/Data Communications in the Network Technology Division of COMSAT Laboratories. His responsibilities include managing the implementation of next generation telecommunication systems for fixed and mobile satellite systems. Current projects include the development of a high data rate gateway switch that provides for the

Key issues regarding the operation of the broadband integrated services digital network (BISDN) via satellite are presented herein. The specific issues, challenges, and their resolutions are detailed. In particular, the impact of error characteristics and propagation delay on the operation of BISDN via satellite is discussed. Solutions are presented for removing adverse effects and providing high-quality service to users of BISDN via satellite.

关键词： ATM BISDN

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Multicast partitioning protocol designs for WDM optical star networks

Multicast partitioning protocol designs for WDM optical star...

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MILCOM, Military communications conference

作者： Ho-Ting Wu Shunyong Huang Kai-Wei Ke Department of Computer Science and Information Engineering National Taipei University of Technology Taipei Taiwan Institute of Computer Communication and Control Engineering National Taipei University of Technology Taipei Taiwan

ISBN: (纸本)0780376250

We first propose a simple and efficient multicast partitioning protocol, called Lookback protocol, for employment in an asynchronous WDM single optical star network. network nodes use random access schemes to send reservation packets over a dedicated packet reservation channel. A central traffic scheduler is allocated to coordinate message transmissions. It executes the Look-back scheduling scheme in real time by searching (back into the input queue) for a candidate multicast message that can be received by all of the intended recipients. Such an approach effectively reduces the head-of-line blocking effects. Performance results conducted via simulations have shown that networks employing such scheduling, mechanisms can exhibit superior network throughput levels and delay performances. To apply this mechanism to a wider range of networking environments, we further consider an inlet-connected dual-star architecture and propose the Modified Lookback (Mlookback) mechanism. By using a simple heuristic approach, the Mlookback scheme is able to successfully, exploit the inter-data channels and properly utilize the wavelength reuse property of the intra-data channels. Performance results have demonstrated the merits of deploying the underlying Mlookback multicast algorithm in such a dual-star structure.

关键词： Multicast protocols optical design Wavelength division multiplexing WDM networks optical fiber networks Access protocols Employment Telecommunication traffic Traffic control Throughput

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Performance estimation and power minimizing scheme for a mobile ad hoc networking node

Performance estimation and power minimizing scheme for a mob...

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International conference on communications and networking, ComNet

作者： Jihane Ben Abderrazak Yukikuni Nishida Hiroaki Nishikawa Department of Computer Science Graduate School of Systems and Information Engineering University of Tsukuba Tsukuba Ibaraki Japan

Power consumption will be one of the most crucial issues to realize future communication environments. Mobile ad hoc networks have been the subject of active research for a number of years. They need no infrastructure and are low power consumption network alternative to existing infrastructure. On the other hand, unlike conventional processor platform, a data-driven multi-processor platform based on self-timed elastic pipeline is lower power architecture that establish parallel processing scheme without any runtime overhead. Thus, the power consumption of a data-driven processor is proportional to the throughput. This feature will be effective to predict and minimize power consumption by adjusting it to the demanded performance needed for a mobile ad hoc node. The research proposed in this paper is a first attempt to realize a system that consumes only substantially needed power by estimating the demanded performance and controlling the supplied power. This paper first proposes a method for estimating the demanded performance of a mobile ad hoc node. Then we try to estimate the suitable voltage and we present the data-driven power controlling scheme. We show that the performance estimation method combined with the power minimizing scheme can achieve minimum essential power consumption, 1/10 to 1/100 of the present.

关键词： Energy consumption Mobile communication Mobile ad hoc networks Pipelines Parallel processing Runtime Throughput control systems Power supplies Voltage control

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Maximal network for best effort services with fair availability

Maximal network for best effort services with fair availabil...

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International conference on Computer communications and networks (ICCCN)

作者： T. Kurimoto T. Shimizu R. Kawamura Media Networking Laboratory NTT Optical Network Systems Laboratories Nippon Telegraph and Telephone Corporation Japan

ISBN: (纸本)0818690143

The Internet was not originally designed to prevent malicious users from securing more resources than other users. Although the best effort service offered by the Internet is quite well known, realizing fair availability in the best effort service is becoming necessary. Accordingly, this paper proposes the maximal network that realizes fair availability. This new concept has two points (1) all users are guided to use some form of (adequate) rate control by the incentives of the proposed maximal network (2) the fair availability between rate controlled users is provided. As guidance, the proposed network penalizes users who refuse to use rate control. Using a distributed algorithm to realize max-min distribution, the proposed network offers fair availability. Its implementation is described and its feasibility is evaluated by computer simulations. It is shown that fair availability can be realized. Lastly, the concept of multi-class best effort service is proposed and simulations show that this service is possible in the maximal network.

关键词： Availability Internet IP networks Transport protocols communication system control Bandwidth Proposals Throughput Application software Telecommunication traffic

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