Special Issue "Green Communications and Networking"

Guest Editor
Dr. Jaime Lloret Mauri
Integrated Management Coastal Research Institute, Polytechnic University of Valencia, Camino de Vera 46022, Valencia, Spain
Website: http://personales.gan.upv.es/jlloret/
E-Mail: jlloret@dcom.upv.es
Phone: +34 609549043
Fax: +34 96 2849313
Interests: P2P networks; wireless local area networks; sensor networks; routing protocols

Guest Editor
Prof. Dr. Joel J. P. C Rodrigues
Instituto de Telecomunicações, Universidade da Beira Interior, ‘Rua Marquês d'Ávila e Bolama, 6201-001 Covilhã, Portugal
Website: http://www.di.ubi.pt/~joel/
E-Mail: joeljr@ieee.org
Phone: +351 275 319 794 ext. 3265
Interests: wireless sensor networks; body sensor networks; delay tolerant networks; vehicular networks; optical burst switching networks; e-learning; mobile learning; mobile computing; ubiquitous computing; e-health; mobile healt

Co-Guest Editor
Dr. Luca Chiaraviglio
DIET Department, University of Rome Sapienza, Via Eudossiana 18, 00184 Rome, Italy
Website: http://151.100.37.12/homepages/chiaraviglio.html
E-Mail: luca.chiaraviglio@diet.uniroma1.it
Interests: sustainable computing; energy-efficient networking

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.

Submission

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. Papers will be published continuously (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are refereed through a peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Future Internet is an international peer-reviewed Open Access quarterly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 500 CHF (Swiss Francs). English correction and/or formatting fees of 250 CHF (Swiss Francs) will be charged in certain cases for those articles accepted for publication that require extensive additional formatting and/or English corrections.

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

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	p. 155-170 Open Access 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; doi:10.3390/fi6010155 Received: 2 December 2013 / Revised: 10 February 2014 / Accepted: 26 February 2014 / Published: 17 March 2014 Show/Hide Abstract | PDF Full-text (346 KB) | HTML Full-text | XML Full-text 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 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. (This article belongs to the Special Issue Green Communications and Networking)
	p. 611-630 Open Access 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; doi:10.3390/fi5040611 Received: 1 November 2013 / Revised: 6 December 2013 / Accepted: 10 December 2013 / Published: 16 December 2013 Show/Hide Abstract | PDF Full-text (544 KB) 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 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. (This article belongs to the Special Issue Green Communications and Networking)
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Last update: 29 October 2013