Physical Layer
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2021 ◽  
Vol 109 (10) ◽  
pp. 1666-1705
Author(s):  
Shiwen He ◽  
Yan Zhang ◽  
Jiaheng Wang ◽  
Jian Zhang ◽  
Ju Ren ◽  
...  

2021 ◽  
Vol 15 ◽  
Author(s):  
Mahendra Ram ◽  
Sushil Kumar ◽  
Arvind Kumar ◽  
Rupak Kharel

Background: Enabling industrial environment with automation is growing trend due to the recent developments as industry 4.0 centric production. The industrial wireless sensor network environments have a number of constraints, including densely deployed nodes, delay constraint for mechanical operation, and access constraints due to node position within instruments. The related literature have applied existing models of wireless sensor network in industrial environment without appropriate updating in the different layers of communication, which results in performance degradation in realistic industrial scenario. Method: This paper presents a framework for Energy Oriented Cross Layer Data Dissemination Path (E-CLD2 P) towards enabling green computing in industrial wireless sensor network environments. It is a cross-layer design approach considering deployment of sensors at the physical layer up to data dissemination at the network layer and smart services at application layer. In particular, an energy centric virtual circular deployment visualization model is presented focusing on physical layer signal transmission characteristics in industrial WSNs scenario. A delay centric angular striping is designed for cluster based angular transmission to support deadline constrained industrial operation in the WSNs environments. Algorithms for energy centric delivery path formulation and node’s role transfer are developed to support green computing in restricted access industrial WSNs scenario. Results: The green computing framework is implemented to evaluate the performance in a realistic industrial WSNs environment. Conclusion: The performance evaluation attests the benefits in terms of number of metrics in realistic industrial constrained environments.


Author(s):  
Jie Sun ◽  
Feng Liu ◽  
Yong Li ◽  
Lianlian Zhang ◽  
Dingyuan Shi

In recent years, various types of heterogeneous networks develop rapidly. The integration of multi-type networks have great values in the fields of military and civil applications. The challenges of integrating multiple networks covers the heterogeneity of multiple aspects, e.g., the architectures, protocols, and switching mechanisms. The existing interconnection technologies of heterogeneous networks mainly include traditional static protocol gateways, traditional software-defined network (SDN) gateways, and improved SDN gateways. However, traditional static protocol gateways need to be customed in advance according to specific scenarios, which leads to the lack of flexibility. Traditional SDN gateways are often used for connecting homogeneous networks. The existing improved SDN gateways often neglect the efficiency and cost of integrating heterogeneous networks. In our work, we propose a software-defined architecture for integrating heterogeneous space and ground networks (SD-SGN). First, we propose an integrated architecture that utilizes SDN gateways and southbound interfaces to shield subnets’ heterogeneity ranging from the physical layer to the network layer. Second, we use the multi-class multi-level flow tables to provide a flexible data plane. Third, we offer an efficient control plane based on the subnet abstraction and global collaborative optimization. Fourth, we give a further discussion on customizing a complete network service based on the proposed SDN architecture. Last, extensive simulations demonstrate that this SDN architecture is effective and performs well in terms of costs, efficiency, and performance.


2021 ◽  
Author(s):  
Waqar Anwar ◽  
Atul Kumar ◽  
Norman Franchi ◽  
Gerhard Fettweis

This paper propose physical layer abstraction for multicarrier modulation techniques which could be used to speed up system-level simulations.


2021 ◽  
Author(s):  
Waqar Anwar ◽  
Atul Kumar ◽  
Norman Franchi ◽  
Gerhard Fettweis

This paper propose physical layer abstraction for multicarrier modulation techniques which could be used to speed up system-level simulations.


2021 ◽  
Author(s):  
Mostafa Abdollahi ◽  
Kousar Malekinasab ◽  
Wanqing Tu ◽  
Mozafar Bag-Mohammadi

2021 ◽  
Vol 11 (17) ◽  
pp. 8200
Author(s):  
Camila M. G. Gussen ◽  
Christophe Laot ◽  
François-Xavier Socheleau ◽  
Benoît Zerr ◽  
Thomas Le Mézo ◽  
...  

Underwater acoustic communication is a key point for performance improvement in an autonomous underwater vehicle (AUV) swarm. The communication process is essential for improving the AUVs localization accuracy for navigation and is a convenient way for sharing information among the AUVs in a network. The objective of this work, which was developed in the COMET and NEMOSENS projects, is to address the communication process required in a mobile underwater wireless network, with a focus on the proposal of an adaptive physical layer methodology. We discuss about the employed channel access method, the frame structure, and we propose the usage of an adaptive guard interval in order to ameliorate the network usage rate. We explain the physical layer aspect of the communication: the data processing at the transmitter and receiver side. In addition to that, we propose the usage of smart communications among AUVs. We design a method for adapting some physical layer parameters. The proposed approach relies only on the knowledge of the transmission geometry, and it optimizes the number of subcarriers and the cyclic-prefix length of the Orthogonal Frequency-Division Multiplexing (OFDM) system. The obtained results show a performance improvement in terms of bit-error rate when compared with the case of random parameters selection. These results corroborate the benefits of our adaptive parameters approach.


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