Green Communications and Networking

A special issue of Future Internet (ISSN 1999-5903).

Deadline for manuscript submissions: closed (30 November 2013) | Viewed by 15375

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Integrated Management Coastal Research Institute, Universitat Politecnica de Valencia, 46022 Valencia, Spain
Interests: network protocols; network algorithms; wireless sensor networks; ad hoc networks; multimedia streaming
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Department of Electronic Engineering, University of Rome Tor Vergata, Via del Politecnico 1, 00133 Rome, Italy
Interests: 5G networks; sustainable computing; energy-efficient networking
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Special Issue Information

Dear Colleagues,

Global warming and climate change have been a growing worldwide concern. Six sources, i.e., transportation, power, buildings, industry, agriculture and forestry, and land use, have been identified as major contributors to the rise of global carbon dioxide (CO2). The mobile industry is seen as a potential enabler to reduce greenhouse gases contributed by these six sources provided that appropriate measures are implemented. On the other hand, the mobile industry itself will also contribute to CO2 emission through network operations, mobile equipments, etc. To meet the requirement of low-carbon economy development, it is necessary to reduce the operation expenditure or energy consumption of mobile networks, while maintaining acceptable quality of service.

This special issue is focused on exploring and seeking new researches, which have not been previously published, on designing, building, and deploying Green Networks. Authors are invited to submit papers from diverse fields including green mobile networks, system architectures, networking & communication protocols, test-bed and prototype, traffic balance and energy-efficient cooperation transmission, system and application issues related to Green Networks.

Prof. Dr. Jaime Lloret
Prof. Dr. Joel Rodrigues
Dr. Luca Chiaraviglio
Guest Editors

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Keywords

  • green communications
  • green networking
  • green mobile networks
  • green protocols

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Published Papers (2 papers)

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Research

346 KiB  
Article
A Novel DOA Estimation Algorithm Using Array Rotation Technique
by Xiaoyu Lan, Liangtian Wan, Guangjie Han and Joel J. P. C. Rodrigues
Future Internet 2014, 6(1), 155-170; https://doi.org/10.3390/fi6010155 - 17 Mar 2014
Cited by 18 | Viewed by 8260
Abstract
The performance of traditional direction of arrival (DOA) estimation algorithm based on uniform circular array (UCA) is constrained by the array aperture. Furthermore, the array requires more antenna elements than targets, which will increase the size and weight of the device and cause [...] Read more.
The performance of traditional direction of arrival (DOA) estimation algorithm based on uniform circular array (UCA) is constrained by the array aperture. Furthermore, the array requires more antenna elements than targets, which will increase the size and weight of the device and cause higher energy loss. In order to solve these issues, a novel low energy algorithm utilizing array base-line rotation for multiple targets estimation is proposed. By rotating two elements and setting a fixed time delay, even the number of elements is selected to form a virtual UCA. Then, the received data of signals will be sampled at multiple positions, which improves the array elements utilization greatly. 2D-DOA estimation of the rotation array is accomplished via multiple signal classification (MUSIC) algorithms. Finally, the Cramer-Rao bound (CRB) is derived and simulation results verified the effectiveness of the proposed algorithm with high resolution and estimation accuracy performance. Besides, because of the significant reduction of array elements number, the array antennas system is much simpler and less complex than traditional array. Full article
(This article belongs to the Special Issue Green Communications and Networking)
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544 KiB  
Article
A Low Energy Consumption DOA Estimation Approach for Conformal Array in Ultra-Wideband
by Liangtian Wan, Lutao Liu, Guangjie Han and Joel J. P. C. Rodrigues
Future Internet 2013, 5(4), 611-630; https://doi.org/10.3390/fi5040611 - 16 Dec 2013
Cited by 6 | Viewed by 6143
Abstract
Most direction-of-arrival (DOA) estimation approaches for conformal array suffer from high computational complexity, which cause high energy loss for the direction finding system. Thus, a low energy consumption DOA estimation algorithm for conformal array antenna is proposed in this paper. The arbitrary baseline [...] Read more.
Most direction-of-arrival (DOA) estimation approaches for conformal array suffer from high computational complexity, which cause high energy loss for the direction finding system. Thus, a low energy consumption DOA estimation algorithm for conformal array antenna is proposed in this paper. The arbitrary baseline direction finding algorithm is extended to estimate DOA for a conformal array in ultra-wideband. The rotation comparison method is adopted to solve the ambiguity of direction finding. The virtual baseline approach is used to construct the virtual elements. Theoretically, the virtual elements can be extended in the space flexibility. Four elements (both actual and virtual elements) can be used to obtain a group of solutions. The space angle estimation can be obtained by using sub-array divided technique and matrix inversion method. The stability of the proposed algorithm can be guaranteed by averaging the angles obtained by different sub-arrays. Finally, the simulation results verify the effectiveness of the proposed method with high DOA estimation accuracy and relatively low computational complexity. Full article
(This article belongs to the Special Issue Green Communications and Networking)
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