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检索条件"主题词=multicast algorithms"

共 2118 条记录，以下是161-170 订阅

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Efficient Single-Group multicast Beamforming: A Determinantal Point Process Approach

Efficient Single-Group Multicast Beamforming: A Determinanta...

引用

Space-Air-Ground Computing (SAGC), International Conference on

作者： Jihang Jian Lingya Liu Cunqing Hua Yiyin Wang Minjian Wang School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai China Shanghai Institute of Satellite Engineering Shanghai China

ISBN: (纸本)9781665400121

The problem of single-group multicast beamforming (SMBF) is well-known NP-hard. It motivates the pursuit of computationally efficient near-optimal solutions. Due to multicasting, the multicast group is bottlenecked by the user(s) with the minimum received signal-to-noise ratio (SNR). This paper proposes to solve the SMBF problem in two steps: i) select the bottlenecking users by a machine learning approach based on determinantal point process (DPP); and ii) design the beamformer for the selected users. The DPP model jointly considers the magnitudes and directions of users' channel vectors, and thus enables an efficient selection of the bottlenecking users. The beamformer is specifically designed for the selected users by applying the QR algorithm, which facilitates the computation by leveraging channel orthogonalization. Numerical results demonstrate the superiority of the proposed algorithm in terms of the performance-complexity compromise.

关键词： Training multicast algorithms Array signal processing Computational modeling Machine learning multicast communication Physical layer

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multicast Directional Modulation Based On Sparse Array Optimization

Multicast Directional Modulation Based On Sparse Array Optim...

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International Wireless Communications and Mobile Computing Conference, IWCMC

作者： Na-Ying Liu Xin Yang Wen-Bin Sun Yan-Yun Gong Ruofan Wang School of Electronics And Information Northwestern Polytechnical University Xian China China Academy of Launch Vehicle Technology

In recent years, the development of satellite communication is rapid, but the security problems become more significant. In this paper, from the perspective of improving the physical layer security, in the context of secure multicast transmission, we apply the sparse array directional modulation technology to improve the physical layer security. However, the inherent problem of sparse array is the existence of high sidelobe, which threatens the security of information transmission. Simulated annealing algorithm is used to optimize the selection of antenna subset, and some antenna combinations with high sidelobe are removed to obtain the optimized antenna subset codebook. When the distance between each ideal receiver and transmitter is different, the weighted simulated annealing algorithm method is introduced to allocate different transmission power to each receiver with different distance to improve the reception quality of each receiver. Finally, the simulation results verify the correctness of the above theory.

关键词： multicast algorithms Transmitters Simulation Modulation Receivers Simulated annealing Physical layer security

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Non-Orthogonal multicast and Unicast Beamforming for Multi-Beam Satellite Communications

Non-Orthogonal Multicast and Unicast Beamforming for Multi-B...

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General Assembly and Scientific Symposium, URSI

作者： Li You Linna Gao Weniin Wang Xiqi Gao National Mobile Communications Research Laboratory Southeast University Nanjing China

We investigate the non-orthogonal multicast and unicast beamforming for multi-beam satellite communications and focus on the spectral efficiency and energy efficiency tradeoff. First of all, the approximate ergodic rate and semidefinite relaxation are adopted to simplify the problem formulation. Then, a nested iterative algorithm applying the majorization-minimization method and quadratic transformation is proposed. Numerical results illustrate the performance of the proposed algorithm.

关键词： multicast algorithms Array signal processing Unicast Spectral efficiency Quality of service Programming Performance gain

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An Improved Hybrid Discrete PSO with GA for Efficient Qos multicast Routing

An Improved Hybrid Discrete PSO with GA for Efficient Qos Mu...

引用

International conference of Electronics, Communication and Aerospace Technology (ICECA)

作者： R. Murugeswari K. Anantha Kumar Saravanan Alagarsamy Kalasalingam Academy of Research and Education Anand Nagar Krishnankoil Tamilnadu India Government Arts and Science College Sivakasi Tamilnadu India

ISBN: (纸本)9781665435253

With the growing need for a multimedia network, an important issue has been raised in wireless networks, named multicast router that ensures Service Quality. The NP-Finish problem is to find a multicast tree that should fill many constraints. In this paper, a hybrid DPSO-GA multicast algorithm that integrates DPSO with geneticists is proposed. The proposed hybrid process has a combined power of PS O and GA algorithm that helps to identify the balance between natural selection and has good information sharing that provides a robust and efficient search of the solution space. This method derives the low cost of the tree from a given source in the destination set with the help of delays and bandwidth problems. In order to get a multicast route, it is necessary to change the continuous space to minimize the space. For this purpose, the concept of Relative Position base Indexing applies here. The simulation of this experiment was performed in NS 2. 26. And comparisons were made under these two conditions with respect to the cost of the tree. One is the flexibility of various nodes and the other is to increase the number of nodes. The result proves that the DPSO-GA algorithm shows better speed, performance and efficiency compared to the multicast route.

关键词： multicast algorithms Costs Wireless networks Quality of service Bandwidth Writing Routing

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Using Programmable P4 Switches to Reduce Communication Costs of Parallel and Distributed Simulations

Using Programmable P4 Switches to Reduce Communication Costs...

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GLOBECOM 2022 - 2022 IEEE Global Communications Conference

作者： Shie–Yuan Wang Nai–En Kuo Department of Computer Science National Yang Ming Chiao Tung University Taiwan

ISBN: (纸本)9781665435413

In the past, several time synchronization methods have been proposed for parallel and distributed simulation (PDS). Among them, one widely used conservative method is the Chandy-Misra-Bryant (CMB) algorithm. In the CMB algorithm, many null messages may be exchanged among logical processes to advance their clocks so that deadlock will not occur among them. In this work, using a data-plane programmable P4 hardware switch, we design and implement a data fusion-based approach inside the packet processing pipeline of the P4 switch. Our approach extracts the timestamp carried in exchanged null messages, computes the fusion results of these timestamps, drops unnecessary null messages inside the switch, generates new messages carrying the fusion results, and sends these generated messages to only the logical processes that can benefit from receiving these messages. Experimental results show that on an 8-host testbed, our approach can speed up a PDS by a factor of 2.75 and 1.65 when compared with the unicast and multicast approaches, respectively.

关键词： Costs multicast algorithms Unicast Pipelines Switches System recovery Hardware

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Q-Learning Algorithm Enabled Topology Control Scheme in Power Line Communication Networks

Q-Learning Algorithm Enabled Topology Control Scheme in Powe...

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Smart Power & Internet Energy Systems (SPIES), International Conference on

作者： Lin Liu Libin Zheng Yusi Wang State Grid Dalian Electric Power Supply Company Liaoning China

The topology control technology is of great importance in the Power Line Communications (PLC) networks for smart power grid. Due to the weak topology controlling ability of current large-scale PLC networks, the throughput of current PLC networks is limited seriously and fail to support more real-time services. To deal with this problem, this paper proposes a Q-Learning algorithm enabled topology control scheme of PLC networks. This robust topology control scheme introduces the Q-learning algorithm into the CSMA/CA protocol and adopts the Markov process to build the networking model of PLC system. Through period on-line learning by proposed algorithm, the robust topology can be established in PLC networks. Test results show that the proposed approach can improve topology control ability for real-time services by smart grid IoT (SG-IoT) systems, in terms of both packet loss rate and time delay performance with great feasibility and efficiency.

关键词： Q-learning multicast algorithms Protocols Network topology Power line communications Packet loss Markov processes

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Admm-Based Fast Algorithm for Robust Multi-Group multicast Beamforming

Admm-Based Fast Algorithm for Robust Multi-Group Multicast B...

引用

IEEE International Conference on Acoustics, Speech and Signal Processing

作者： Niloofar Mohamadi Min Dong Shahram ShahbazPanahi Ontario Tech University Ontario Canada

We consider robust multi-group multicast beamforming design in massive multiple-input multiple-output (MIMO) large-scale systems. The goal is to minimize the transmit power subject to the minimum signal-to-interference-plus-noise-ratio (SINR) targets under channel uncertainty. Using the exact worst-case SINR constraints, we transform the problem into a non-convex optimization problem. We develop an alternating direction method of multipliers (ADMM) based fast algorithm to solve this problem directly with convergence guarantee. Our two-layer ADMM-based algorithm decomposes the non-convex problem into a sequence of convex subproblems, for which we obtain the semi-closed-form or closed-form solutions. Simulation studies show that our algorithm provides a considerable computational advantage over the conventional interior-point method non-convex solver with nearly identical performance.

关键词： multicast algorithms Uncertainty Closed-form solutions Array signal processing Signal processing algorithms Interference Large-scale systems

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Dynamic multicast Routing Management for Robust Wide Area Power Grid Communication

Dynamic Multicast Routing Management for Robust Wide Area Po...

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Annual Meeting Industrial and Commercial Power Systems Technical Conference

作者： Tazim Ridwan Billah Kushal Mahesh S. Illindala Jiankang Wang The Ohio State University Columbus OH USA

ISBN: (纸本)9781728186320;9781728186337

High-volume synchrophasor data generated by wide area measurement system (WAMS) presents new challenges for the design of scalable and robust communication architectures suitable for large-scale deployment in power grid monitoring and control applications. Features of information and communication technology (ICT) can be harnessed to devise a more flexible infrastructure than the conventional unicast-based hierarchical architecture. multicast has been suggested as a potential solution for scalability issues in the current WAMS architecture. This paper proposes a decentralized dynamic multicast routing management algorithm that manages network traffic efficiently, improves scalability, and makes the system resilient to component failures. The algorithm models creation of alternate links as a stochastic process using random-graph theory and manages connections between end hosts at the session layer. This protocol can be implemented using existing ICT protocols with minimal cost. Numerical simulations show that the proposed algorithm improves the topological efficiency and resilience of the network.

关键词： Protocols multicast algorithms Heuristic algorithms Scalability Power system dynamics Stochastic processes Computer architecture

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Cache Placement with Virtual Matching in Large-Scale Cache-Enabled multicasting Wireless Networks

Cache Placement with Virtual Matching in Large-Scale Cache-E...

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International Conference on Communication Technology (ICCT)

作者： Wanning Liu Ducheng Wu Yitao Xu Na He Tianyao Zhong College of Communications Engineering Army Engineering University of PLA Nanjing China

To solve the multi-dimensional resource allocation problem in the large-scale cache-enabled multicasting wireless networks, this paper proposes a multi-stage virtual matching game method. Specifically, the proposed method performs virtual grouping of mobile users (MUs) according to location distribution of MUs, the file request probabilities of MUs, and the coverage area of cache-enabled access points (CAPs). Moreover, by virtual grouping, the huge decision-making space has been significantly reduced. Then, we propose the multi-stage virtual matching game method, which is superior to the better response (BR) algorithm in computation of single iteration, convergence speed, and system utility function.

关键词： multicast algorithms Wireless networks Simulation Decision making Games Quality of service multicast communication

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Opportunistic Multi-cast Routing for Improved Multimedia Delivery in Emerging Wireless Networks

Opportunistic Multi-cast Routing for Improved Multimedia Del...

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Information Technology (ACIT)

作者： Haythem Bany Salameh Mustafa Ali Department of Network & Communications Engineering Al Ain University UAE Department of Telecommunications Engineering Yarmouk University Jordan Electrical Eng. Department Mustansiriyah University Iraq

ISBN: (数字)9798350320244

ISBN: (纸本)9798350320251

multicast routing and cognitive radio (CR) technology are essential in enabling efficient large-scale video sharing and data dissemination in emerging multi-hop wireless networks (e.g., 5G and B5G). multicast routing can be effectively performed if the spectrum is always accessible to the network. However, the time-variant dynamic primary users (PUs) activities, spectrum heterogeneity across the multi-hop CR network (CRN), and the PU's access priority complicate the task of designing efficient CR-based multicast routing algorithms. This paper presents a hierarchical multicast routing algorithm for multi-hop CRNs that utilizes the shortest path tree (SPT) concept. The proposed mechanism employs the packet success probability metric to perform the channel assignment over each defined layer in the SPT. The most reliable channel over each layer is utilized to deliver the multicast transmission. The effectiveness of the proposed algorithm is investigated through simulations. Compared to baseline algorithms, the proposed algorithm reveals significant performance improvement in throughput and packet delivery rate (PDR) under different operating scenarios.

关键词： Measurement multicast algorithms Heuristic algorithms Wireless networks Spread spectrum communication Channel allocation Routing

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