Relevant bibliographies by topics / Spectrum efficiency

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Academic literature on the topic 'Spectrum efficiency'

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Published: 4 June 2021

Last updated: 25 May 2024

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Journal articles on the topic "Spectrum efficiency"

Haddad, M., A. Hayar, and M. Debbah. "Spectral efficiency of spectrum-pooling systems." IET Communications 2, no. 6 (2008): 733. http://dx.doi.org/10.1049/iet-com:20070469.

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Mück, Markus, and Christophe GAIE. "The Future of Spectrum Management - Conciliating Spectrum Allocation, Spectral Efficiency and Spectrum Monetization." International Journal of Computational Systems Engineering 7, no. 1 (2022): 1. http://dx.doi.org/10.1504/ijcsyse.2022.10054832.

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Gaie, Christophe, and Markus Mueck. "The future of spectrum management - conciliating spectrum allocation, spectral efficiency and spectrum monetisation." International Journal of Computational Systems Engineering 7, no. 1 (2022): 1. http://dx.doi.org/10.1504/ijcsyse.2022.131031.

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Saha, Rony Kumer. "Realization of Licensed/Unlicensed Spectrum Sharing Using eICIC in Indoor Small Cells for High Spectral and Energy Efficiencies of 5G Networks." Energies 12, no. 14 (July 22, 2019): 2828. http://dx.doi.org/10.3390/en12142828.

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In this paper, we show how to realize numerous spectrum licensing policies by means of time-domain enhanced inter-cell interference coordination (eICIC) technique to share both the licensed and unlicensed spectrums with small cells in order to address the increasing demand of capacity, spectral efficiency, and energy efficiency of future mobile networks. Small cells are deployed only in 3-dimensional (3D) buildings within a macrocell coverage of a mobile network operator (MNO). We exploit the external wall penetration loss of each building to realize traditional dedicated access, co-primary shared access (CoPSA), and licensed shared access (LSA) techniques for the licensed spectrum access, whereas, for the unlicensed spectrum access, the licensed assisted access (LAA) technique operating in the 60 GHz unlicensed band is realized. We consider that small cells are facilitated with dual-band, and derive the average capacity, spectral efficiency, and energy efficiency metrics for each technique. We perform extensive evaluation of various performance metrics and show that LAA outperforms considerably all other techniques concerning particularly spectral and energy efficiencies. Finally, we define an optimal density of small cells satisfying both the spectral efficiency and energy efficiency requirements for the fifth-generation (5G) mobile networks.

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Saha, Rony Kumer. "Countrywide Mobile Spectrum Sharing with Small Indoor Cells for Massive Spectral and Energy Efficiencies in 5G and Beyond Mobile Networks." Energies 12, no. 20 (October 10, 2019): 3825. http://dx.doi.org/10.3390/en12203825.

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In this paper, we propose a technique to share the licensed spectrums of all mobile network operators (MNOs) of a country with in-building small cells per MNO by exploiting the external wall penetration loss of a building and introducing the time-domain eICIC technique. The proposed technique considers allocating the dedicated spectrum Bop per MNO only its to outdoor macro UEs, whereas the total spectrum of all MNOs of the country Bco to its small cells indoor per building such that technically any small indoor cell of an MNO can have access to Bco instead of merely Bop assigned only to the MNO itself. We develop an interference management strategy as well as an algorithm for the proposed technique. System-level capacity, spectral efficiency, and energy efficiency performance metrics are derived, and a generic model for energy efficiency is presented. An optimal amount of small indoor cell density in terms of the number of buildings L carrying these small cells per MNO to trade-off the spectral efficiency and the energy efficiency is derived. With the system-level numerical and simulation results, we define an optimal value of L for a dense deployment of small indoor cells of an MNO and show that the proposed spectrum sharing technique can achieve massive indoor capacity, spectral efficiency, and energy efficiency for the MNO. Finally, we demonstrate that the proposed spectrum sharing technique could meet both the spectral efficiency and the energy efficiency requirements for 5G mobile networks for numerous traffic arrival rates to small indoor cells per building of an MNO.

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Kim, Taehan, Hyun-Min Park, and Ki Won Sung. "Measurement of Spectrum Utilization Efficiency Considering Spectrum Sharing." Journal of the Korea Contents Association 14, no. 9 (September 28, 2014): 589–97. http://dx.doi.org/10.5392/jkca.2014.14.09.589.

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Vadim Nozdrin. "Economic efficiency of spectrum allocation." ITU Journal on Future and Evolving Technologies 2, no. 1 (March 15, 2021): 67–76. http://dx.doi.org/10.52953/mwlm5949.

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Spectrum demand is rapidly expanding, driven by the developments of incumbent radio systems, as well as with the requirements of new technologies and market players to get spectrum access. In this regard, one of the fundamental functions of the state spectrum regulator is to create an enabling administrative and legal environment to ensure efficient spectrum use and to mitigate scarcity of this valuable natural resource. This paper analyses the economic value of spectrum use and suggests an extension of the spectrum's traditional technical boundaries, in order to take into consideration energy, environmental, sanitary and bio-geotechnical limits. The study reviews the phenomena of increasing transaction costs and negative externalities of spectrum access requiring economic criteria and assessment to achieve optimum resource allocation with a spectrum's demand growth. Results develop an input-output matrix as an allocation instrument to achieve spectrum efficiency and optimum equilibrium based on analysis of the economic effects from different band utilization scenarios, supplemented by currently used technical criteria. Practical application of proposed economic methods should improve the existing spectrum management system.

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Lee, W. C. Y. "Spectrum efficiency in cellular (radio)." IEEE Transactions on Vehicular Technology 38, no. 2 (May 1989): 69–75. http://dx.doi.org/10.1109/25.61338.

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Freyens, Benoît Pierre, and Oleg Yerokhin. "Allocative vs. technical spectrum efficiency." Telecommunications Policy 35, no. 4 (May 2011): 291–300. http://dx.doi.org/10.1016/j.telpol.2011.02.002.

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Ayeni, A. A. "SPATIAL SPECTRUM UTILIZATION EFFICIENCY METRIC FOR SPECTRUM SHARING SYSTEM." International Journal of Digital Information and Wireless Communications 5, no. 1 (2015): 44–51. http://dx.doi.org/10.17781/p001560.

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Dissertations / Theses on the topic "Spectrum efficiency"

Bhattarai, Sudeep. "Spectrum Efficiency and Security in Dynamic Spectrum Sharing." Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/82872.

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We are in the midst of a major paradigm shift in how we manage the radio spectrum. This paradigm shift in spectrum management from exclusive access to shared access is necessitated by the growth of wireless services and the demand pressure imposed on limited spectrum resources under legacy management regimes. The primary constraint in any spectrum sharing regime is that the incumbent users (IUs) of the spectrum need to be protected from harmful interference caused due to transmissions from secondary users (SUs). Unfortunately, legacy techniques rely on inadequately flexible and overly conservative methods for prescribing interference protection that result in inefficient utilization of the shared spectrum. In this dissertation, we first propose an analytical approach for characterizing the aggregate interference experienced by the IU when it shares the spectrum with multiple SUs. Proper characterization of aggregate interference helps in defining incumbent protection boundaries, a.k.a. Exclusion Zones (EZs), that are neither overly aggressive to endanger the IU protection requirement, nor overly conservative to limit spectrum utilization efficiency. In particular, our proposed approach addresses the two main limitations of existing methods that use terrain based propagation models for estimating the aggregate interference. First, terrain-based propagation models are computationally intensive and data-hungry making them unsuitable for large real-time spectrum sharing applications such as the spectrum access system (SAS). Second, terrain based propagation models require accurate geo-locations of SUs which might not always be available, such as when SUs are mobile, or when their locations are obfuscated for location privacy concerns. Our second contribution in this dissertation is the novel concept of Multi-tiered Incumbent Protection Zones (MIPZ) that can be used to prescribe interference protection to the IUs. Based on the aforementioned analytical tool for characterizing the aggregate interference, we facilitate a framework that can be used to replace the legacy notion of static and overly conservative EZs with multi-tiered dynamic EZs. MIPZ is fundamentally different from legacy EZs in that it dynamically adjusts the IU's protection boundary based on the radio environment, network dynamics, and the IU interference protection requirement. Our extensive simulation results show that MIPZ can be used to improve the overall spectrum utilization while ensuring sufficient protection to the IUs. As our third contribution, we investigate the operational security (OPSEC) issue raised by the emergence of new spectrum access technologies and spectrum utilization paradigms. For instance, although the use of geolocation databases (GDB) is a practical approach for enabling efficient spectrum sharing, it raises a potentially serious OPSEC problem, especially when some of the IUs are federal government entities, including military users. We show that malicious queriers can readily infer the locations of the IUs even if the database's responses to the queries do not directly reveal such information. To address this issue, we propose a perturbation-based optimal obfuscation strategy that can be implemented by the GDB to preserve the location privacy of IUs. The proposed obfuscation strategy is optimal in the sense that it maximizes IUs' location privacy while ensuring that the expected degradation in the SUs' performance due to obfuscated responses does not exceed a threshold. In summary, this dissertation focuses on investigating techniques that improve the utilization efficiency of the shared spectrum while ensuring adequate protection to the IUs from SU induced interference as well as from potential OPSEC threats. We believe that this study facilitates the regulators and other stakeholders a better understanding of mechanisms that enable improved spectrum utilization efficiency and minimize the associated OPSEC threats, and hence, helps in wider adoption of dynamic spectrum sharing.
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Deepak, G. C. "Spectrum sharing systems for improving spectral efficiency in cognitive cellular network." Thesis, Lancaster University, 2017. http://eprints.lancs.ac.uk/85771/.

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Since spectrum is the invisible infrastructure that powers the wireless communication, the demand has been exceptionally increasing in recent years after the implementation of 4G and immense data requirements of 5G due to the applications, such as Internet-of-Things (IoT). Therefore, the effective optimization of the use of spectrum is immediately needed than ever before. The spectrum sensing is the prerequisite for optimal resource allocation in cognitive radio networks (CRN). Therefore, the spectrum sensing in wireless system with lower latency requirements is proposed first. In such systems with high spatial density of the base stations and users/objects, spectrum sharing enables spectrum reuse across very small regions. The proposed method in this Thesis is a multi-channel cooperative spectrum sensing technique, in which an independent network of sensors, namely, spectrum monitoring network, detects the spectrum availability. The locally aggregated decision in each zone associated with the zone aggregator (ZA) location is then passed to a decision fusion centre (DFC). The secondary base station (SBS) accordingly allocates the available channels to secondary users to maximize the spectral efficiency. The function of the DFC is formulated as an optimization problem with the objective of maximizing the spectral efficiency. The optimal detection threshold is obtained for different cases with various spatial densities of ZAs and SBSs. It is further shown that the proposed method reduces the spectrum sensing latency and results in a higher spectrum efficiency. Furthermore, a novel power allocation scheme for multicell CRN is proposed where the subchannel power allocation is performed by incorporating network-wide primary system communication activity. A collaborative subchannel monitoring scheme is proposed to evaluate the aggregated subchannel activity index (ASAI) to indicate the activity levels of primary users. Two utility functions are then defined to characterize the spectral efficiency (SE) and energy efficiency (EE) as a function of ASAI to formulate a utility maximization problem. The optimal transmit power allocation is then obtained with the objective of maximizing the total utility at the SBS, subject to maximum SBS transmit power and collision probability constraint at the primary receivers. Since optimal EE and SE are two contradicting objectives to obtain the transmit power allocation, the design approach to handle both EE and SE as a function of common network parameter, i.e., ASAI, is provided which ultimately proves the quantitative insights on efficient system design. Extensive simulation results confirm the analytical results and indicate a significant improvement in sensing latency and accuracy and a significant gain against the benchmark models on the rate performance, despite the proposed methods perform with lower signalling overhead.

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Zhao, Bo. "Spectrum efficiency improvement techniques for wireless communications." Thesis, University of Warwick, 2011. http://wrap.warwick.ac.uk/36885/.

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Ultra-wideband (UWB) and cognitive radio have been proposed as two important approaches to improve the spectrum efficiency of wireless communications. The aim of this thesis is to study these two techniques considering different practical conditions. The study of the UWB technique begins with the analysis of the statistical properties of the sum of path gains using maximum ratio combining technique based on the IEEE UWB channel models. This analysis helps to justify the equivalent tapped-delay-line discrete UWB channel models. Following the study of the UWB channel models, signal-to-interferenceplus- noise ratio is analyzed for direct sequence binary phase shift keying UWB Rake receivers. Closed-form expressions for the signal-to-interferenceplus- noise ratio are derived by taking inter-path interference, inter-chip interference and inter-symbol interference as well as multiple-access interference into account. The analysis framework is further used to optimize the integration interval for UWB transmitted reference receivers. In addition to the signal-to-interference-plus-noise ratio, channel capacity of UWB systems with timing errors is also analyzed in this work. Both additive white Gaussian noise and multipath fading channels are studied. All the necessary interferences are considered. Moreover, transmitted reference systems are also considered as an example of non-coherent UWB systems for the capacity analysis. Novel adaptive receivers are also proposed for multi-user UWB systems in this thesis, as conventional matched-filter detection is not optimal in multi-user environments due to the non-Gaussian multiple-access interference. The new receivers adopt modified correlation operations without designing new decision rules. Numerical results show that the new receivers outperform the conventional receivers in both additive white Gaussian noise and multipath fading channels. For cognitive radio, spectrum sensing based on energy detection is studied. In order to make the analysis closer to practical applications, traffic load of the multiple primary users is taken into account. Expressions for the probability of detection, probability of false alarm and error probability are derived for both standalone spectrum sensing and collaborative spectrum sensing. In addition, the effect of the primary user traffic on the signal-to-noise ratio wall of energy detection is evaluated when noise uncertainty is present. Collaborative user number selection is also investigated in this work. The number of collaborative users is selected to maximize the effective throughput considering both the sensing performance in the physical layer and the throughput performance in the upper layer. Different channel conditions and decision rules are considered. Expressions for the optimum number of collaborative users are derived and verified.

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Petrini, Valeria <1984&gt. "Cognitive radio applications for enhanced spectrum efficiency." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5493/1/Petrini_Valeria_tesi.pdf.

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The aim of this thesis is the study of techniques for efficient management and use of the spectrum based on cognitive radio technology. The ability of cognitive radio technologies to adapt to the real-time conditions of its operating environment, offers the potential for more flexible use of the available spectrum. In this context, the international interest is particularly focused on the “white spaces” in the UHF band of digital terrestrial television. Spectrum sensing and geo-location database have been considered in order to obtain information on the electromagnetic environment. Different methodologies have been considered in order to investigate spectral resources potentially available for the white space devices in the TV band. The adopted methodologies are based on the geo-location database approach used either in autonomous operation or in combination with sensing techniques. A novel and computationally efficient methodology for the calculation of the maximum permitted white space device EIRP is then proposed. The methodology is suitable for implementation in TV white space databases. Different Italian scenarios are analyzed in order to identify both the available spectrum and the white space device emission limits. Finally two different applications of cognitive radio technology are considered. The first considered application is the emergency management. The attention is focused on the consideration of both cognitive and autonomic networking approaches when deploying an emergency management system. The cognitive technology is then considered in applications related to satellite systems. In particular a hybrid cognitive satellite-terrestrial is introduced and an analysis of coexistence between terrestrial and satellite networks by considering a cognitive approach is performed.

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Petrini, Valeria <1984&gt. "Cognitive radio applications for enhanced spectrum efficiency." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5493/.

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Lu, Lu. "Spectral-efficient design in modern wireless communications networks." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53902.

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We investigate spectral-efficient design and develop novel schemes to improve spectral efficiency of the modern wireless communications networks. Nowadays, more and more spectrum resources are required to support various high-data-rate applications while spectrum resources are limited. Moreover, static allocation and exclusive access in current spectrum assignment policy caused a lot of licensed spectrum bands to be underutilized. To deal with the problem, cognitive radio (CR) has been developed, which allows unlicensed/secondary users to transmit with licensed/primary users as long as the former ones do not generate intolerable interference to the latter ones. The coexistence of users and networks requires careful and dynamic planning to mitigate interference. Otherwise, the network performance will be severely undermined. We study both spectrum sensing and spectrum access techniques and propose several transmit schemes for different types of cognitive ratio networks, including spectrum overlay and spectrum underlay systems. The proposed algorithms can improve spectral efficiency of the networks efficiently and have potentials to be used in future wireless communications networks.

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Pearce, David Andrew James. "Improving spectrum efficiency in fixed cellular communication systems." Thesis, University of York, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.341520.

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Xu, Yiran. "Quality of Experience Aware Spectrum Efficiency and Energy Efficiency Over Wireless Heterogeneous Networks." DigitalCommons@USU, 2016. https://digitalcommons.usu.edu/etd/4664.

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Propelled by the explosive increases in mobile data traffic volume, existing wireless technologies are stretched to their capacity limits. There is a tremendous need for an expansion in system capacity and an improvement on energy efficiency. In addition, wireless network will support more and more multimedia services and applications, in which user experience has been always an important factor in evaluating the overall network performance. In order to keep pace with this explosion of data traffic and to meet the emerging quality of experience needs, wireless heterogeneous networks have been introduced as a promising network architecture evolution of the traditional cellular network. In this dissertation, we explore video quality-aware spectrum efficiency and energy efficiency in wireless heterogeneous networks|the potentials and the associated technical challenges. In particular, aiming to significantly enhance spectrum efficiency, we need to tackle the interference issue, which is exacerbated in heterogeneous network due to ultra dense node deployment as well as heterogeneity nature of various nodes. Specifically, werst study an optimal intra-cell inter-tier cooperation to mitigate interference between high power nodes and low power nodes. Together with cooperation, optimal mobile association and resource allocation schemes are also intensively investigated in heterogeneous network to achieve system load balancing so that bandwidth at high power and low power nodes can be utilized in the optimal way. The proposed scheme can greatly alleviate inter-tier interference and significantly increase overall system spectrum efficiency in a heterogeneous network. We then further apply advanced algorithms such as precoding, and non-orthogonal multiple access into intra-cell inter-tier cooperation so that the overall system spectrum efficiency and user experience are even more improved. When supporting a video type application in such a heterogeneous network, considering only spectrum efficiency is far from enough as video application is bandwidth consuming, battery consuming, and quality demanding. We develop a video quality-aware spectrum and energy efficiency resource allocation scheme in a wireless heterogeneous network and propose novel performance metrics to establish fundamental relationships among spectrum efficiency, energy efficiency, and quality of experience. Extensive simulations are conducted to evaluate the trade-o performance among three performance metrics.

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Luo, Chunbo. "On the study of high spectrum efficiency relay networks." Thesis, University of Reading, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.553131.

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In the cooperative networks, in order to combat the 50% spectrum efficiency loss of the half-duplex limit imposed on most of the mobile terminals, this thesis studies the high efficiency two-path model and proposes the selective two-path model to recover the efficiency loss and explore the diversity. In the two-path succussive relay cooptative transmission, the 50% loss in data rate can be well avoided because the source can continuously transmit to two relays alternatively. Due to the concurrent transmission from source and relays, however, inter-relay interference may significantly damage the performance. Various practical interference cancellation algorithms are introduced in the thesis. Two practical relay protocols for the two-path model are studied: the amplify-forward protocol and decode-forward protocol. With the application of these two protocols, the interference emerges with different effects towards the final received signal. As demonstrated in the simulation parts, we show that the proposed algorithms can suppress the interference effectively, thus achieve satisfied performance without the sacrifice of other resources, e.g. time, frequency or space. " With the help of information theoretical tools, the analysis of the proposed selective two-path model proves that it can achieve diversity order of M if there are M potential relay candidates. Such diversity is obtained without the reduction of spectrum efficiency. The selective two-path model can combat the fading of wireless channels and improve the robustness of the system without the cost of power or bandwidth. With the recovered 50% spectrum efficiency, such model can be used in the cooperative networks which require high data rate and spectrum efficiency, for example, cellular networks or wireless sensor networks.

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JUNIOR, JOSE AFONSO COSMO. "METHODS FOR ASSESSMENT OF THE RADIO SPECTRUM USE EFFICIENCY." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2006. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=9205@1.

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CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
Nesta dissertação é proposto um novo método para a avaliação da eficiência de uso do espectro a ser aplicado para os sistemas de telecomunicações pontoárea, incluindo radiodifusão, e ponto-a-ponto. A definição proposta para o índice de eficiência é baseada nos aspectos técnicos, mas outros aspectos que podem influenciar na determinação da eficiência dos sistemas de telecomunicações, como os econômicos, sociais, políticos e estratégicos também são discutidos. O método é testado com dados reais de sistemas disponibilizados pela Anatel e no sítio dos prestadores de serviços de telecomunicações no Brasil. É muito importante avaliar a eficiência dos sistemas de telecomunicações, pois sendo o espectro de radiofreqüências um recurso limitado, pela tecnologia e capacidade de gerenciamento, a introdução de novos serviços de telecomunicações somente será possível com a substituição, pela realocação ou extinção, de determinadas aplicações menos eficientes. Apesar da regulamentação nacional e internacional constantemente referir-se à importância do uso eficiente das faixas de freqüências, não existe um método harmonizado de avaliação, o que impede a verificação deste aspecto pelos órgãos reguladores. As novas tecnologias e as oportunidades de desenvolvimento social que elas proporcionam demonstram a necessidade da boa gerência do espectro de radiofreqüências e de que cada uma de suas porções seja utilizada de forma eficiente e adequada a cada tipo de aplicação.
In this work a new method for the assessment of the spectrum use efficiency is proposed to be applied to point-area, including broadcasting, and point-to-point telecommunications systems. The proposed definition of the efficiency index is based in technical aspects, but other subjects that affect the determination of a telecommunications system efficiency, as economics, social, political and strategic issues are also discussed. The method is tested with data of real systems available from the Brazilian Regulatory Agency (Anatel) and at the telecommunications service providers web sites. It is very important to assess the telecommunications systems efficiency, because being the radio spectrum a scarce resource, limited by technology and management capacity, the introduction of new telecommunications services will only be possible by replacement, refarming or suppression of some less efficient applications. Despite national and international regulations usually refers to the importance of efficient use of the frequency bands, there is no harmonized assessment method to be applied and verified by the regulators. The new technologies and the opportunities for social development provided by them, bring to the light the need for a good radio spectrum management and how each part of it must be used efficiently and assigned properly for each type of application or telecommunications service.

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Books on the topic "Spectrum efficiency"

Antonio, Martí, Luque A, and Institute of Physics (Great Britain)., eds. Next generation photovoltaics: High efficiency through full spectrum utilization. Bristol: Institute of Physics, 2004.

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United States. General Accounting Office., United States. Congress. House. Committee on Government Reform., and United States. Congress. House. Committee on Government Reform. Subcommittee on Technology, Information Policy, Intergovernmental Relations, and the Census., eds. Spectrum management: Better knowledge needed to take advanage of technologies that may improve spectrum efficiency : report to Congressional Requesters. Washington, D.C: U.S. General Accounting Office, 2004.

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Creating opportunities through improved government spectrum efficiency: Hearing before the Subcommittee on Communications and Technology of the Committee on Energy and Commerce, House of Representatives, One Hundred Twelfth Congress, second session, September 13, 2012. Washington: U.S. Government Printing Office, 2014.

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Ren, Ju, Ning Zhang, and Xuemin Shen. Energy-Efficient Spectrum Management for Cognitive Radio Sensor Networks. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-60318-6.

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Rubak, Jan. Efficient spectral representation of measured signals. Ottawa: National Library of Canada, 2002.

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Zhou, Xiang, and Chongjin Xie, eds. Enabling Technologies for High Spectral-Efficiency Coherent Optical Communication Networks. Hoboken, NJ, USA: John Wiley & Sons, Inc, 2016. http://dx.doi.org/10.1002/9781119078289.

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United States. National Aeronautics and Space Administration., ed. Pulse shaped 8-PSK bandwidth efficiency and spectral spike elimination. Las Cruces, N.M: New Mexico State University, 1998.

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United States. National Aeronautics and Space Administration., ed. Pulse shaped 8-PSK bandwidth efficiency and spectral spike elimination. Las Cruces, N.M: New Mexico State University, 1998.

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United States. National Aeronautics and Space Administration., ed. Pulse shaped 8-PSK bandwidth efficiency and spectral spike elimination. Las Cruces, N.M: New Mexico State University, 1998.

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United States. National Aeronautics and Space Administration., ed. Pulse shaped 8-PSK bandwidth efficiency and spectral spike elimination. Las Cruces, N.M: New Mexico State University, 1998.

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Book chapters on the topic "Spectrum efficiency"

Charman, Tony, Susan Hepburn, Moira Lewis, Moira Lewis, Amanda Steiner, Sally J. Rogers, Annemarie Elburg, et al. "Efficiency (Behavioral Assessment)." In Encyclopedia of Autism Spectrum Disorders, 1065. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4419-1698-3_1031.

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Rohrer, Jessica. "Efficiency (Behavioral Assessment)." In Encyclopedia of Autism Spectrum Disorders, 1648–49. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-319-91280-6_1031.

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Chen, Junjie, Qilian Liang, Jie Wang, and Hyeong-Ah Choi. "Spectrum Efficiency of Nested Sparse Sampling." In Wireless Algorithms, Systems, and Applications, 574–83. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-31869-6_50.

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Joshi, Saumil, Sachit Grover, and Garret Moddel. "Efficiency Limits for Solar Spectrum Rectification." In Rectenna Solar Cells, 47–67. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-3716-1_3.

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Han, Ning, Sung Hwan Shon, Jong Ok Joo, and Jae Moung Kim. "Spectrum Sensing Method for Increasing the Spectrum Efficiency in Wireless Sensor Network." In Ubiquitous Computing Systems, 478–88. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/11890348_36.

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Xu, Lei, Qilian Liang, Jie Wang, and Hyeong-Ah Choi. "Design and Spectrum Efficiency of a New Waveform." In Wireless Algorithms, Systems, and Applications, 660–69. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-31869-6_57.

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Cui, Cuimei, Dezhi Yang, and Shi Jin. "Robust Spectrum-Energy Efficiency for Green Cognitive Communications." In 2nd International Conference on 5G for Ubiquitous Connectivity, 121–30. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-22316-8_10.

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Wang, Xu-hui, and Cheng-lin Zhao. "Research on Enhanced Spectrum Efficiency for BWA Networks." In Wireless Algorithms, Systems, and Applications, 322–29. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-14654-1_42.

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Berens, Friedbert, Peter Jung, and Jörg Plechinger. "Uplink spectral efficiency of multicarrier joint detection code division multiple access based cellular radio systems." In Multi-Carrier Spread-Spectrum, 211–18. Boston, MA: Springer US, 1997. http://dx.doi.org/10.1007/978-1-4615-6231-3_25.

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Singh, Rohit, and Douglas Sicker. "Improving Spectrum Efficiency in Heterogeneous Networks Using Granular Identification." In Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 189–99. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-05490-8_18.

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Conference papers on the topic "Spectrum efficiency"

Kim, Kwang-Yul, Seung-Woo Lee, and Yoan Shin. "Spectral Efficiency Improvement of Chirp Spread Spectrum Systems." In 2019 International Conference on Information and Communication Technology Convergence (ICTC). IEEE, 2019. http://dx.doi.org/10.1109/ictc46691.2019.8939967.

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Nguyen, Hung, and Tien Nguyen. "Power Spectral Analysis for Spectrum Packing Efficiency Evaluation." In 21st International Communications Satellite Systems Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2003. http://dx.doi.org/10.2514/6.2003-2238.

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Adachi, Koichi, Fumiyuki Adachi, and Masao Nakagawa. "On Cellular MIMO Spectrum Efficiency." In 2007 IEEE 66th Vehicular Technology Conference. IEEE, 2007. http://dx.doi.org/10.1109/vetecf.2007.99.

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Atwater, Harry A., Matthew D. Escarra, Carissa N. Eisler, Emily D. Kosten, Emily C. Warmann, Sunita Darbe, John Lloyd, and Cristofer Flowers. "Full spectrum ultrahigh efficiency photovoltaics." In 2013 IEEE 39th Photovoltaic Specialists Conference (PVSC). IEEE, 2013. http://dx.doi.org/10.1109/pvsc.2013.6744457.

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Burns, J. W. "Measuring spectrum efficiency - the art of spectrum utilisation metrics." In IEE Two Day Conference. Getting the Most Out of the Radio Spectrum. IEE, 2002. http://dx.doi.org/10.1049/ic:20020229.

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ARAUJO, Daniel C., Guillaume FERRE, Charles CASIMIRO CAVALCANTE, and Igor M. GUERREIRO. "A Spectral Efficiency Enhancement for Chirp Spread Spectrum Downlink Communications." In 2020 IEEE Latin-American Conference on Communications (LATINCOM). IEEE, 2020. http://dx.doi.org/10.1109/latincom50620.2020.9282266.

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Sinanovic, Sinan, Nikola Serafimovski, Harald Haas, and Gunther Auer. "Optimum Spectral Efficiency of Horizontally Spectrum Sharing 2-Link System." In 2008 IEEE Vehicular Technology Conference (VTC 2008-Spring). IEEE, 2008. http://dx.doi.org/10.1109/vetecs.2008.409.

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Qi, Lin, Lian Zhou, and Zheng Dou. "A modified dynamic spectrum access method to enhance spectrum efficiency." In 2016 IEEE International Conference on Electronic Information and Communication Technology (ICEICT). IEEE, 2016. http://dx.doi.org/10.1109/iceict.2016.7879668.

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Huiling Zhu. "Spectrum Efficiency in Distributed Antenna Systems." In 2011 IEEE Global Communications Conference (GLOBECOM 2011). IEEE, 2011. http://dx.doi.org/10.1109/glocom.2011.6134371.

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Yang, Menghui, Tonghong Li, Weikang Yang, Xin Su, and Jing Wang. "A High Spectrum Efficiency Transmission Scheme." In 2009 International Conference on Scalable Computing and Communications; Eighth International Conference on Embedded Computing. IEEE, 2009. http://dx.doi.org/10.1109/embeddedcom-scalcom.2009.38.

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Reports on the topic "Spectrum efficiency"

Bajari, Patrick, and Jeremy Fox. Measuring the Efficiency of an FCC Spectrum Auction. Cambridge, MA: National Bureau of Economic Research, October 2005. http://dx.doi.org/10.3386/w11671.

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Schubert, E. F. Ultraviolet-spectrum Light-emitting Diodes with Omnidirectional Reflectors for High Extraction Efficiency. Fort Belvoir, VA: Defense Technical Information Center, February 2003. http://dx.doi.org/10.21236/ada414747.

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She, Ruifeng, and Yanfeng Ouyang. Analysis of Drone-based Last-mile Delivery Systems under Aerial Congestion: A Continuum Approximation Approach. Illinois Center for Transportation, August 2023. http://dx.doi.org/10.36501/0197-9191/23-014.

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This paper presents a systematic analysis and design framework for a spectrum of last-mile delivery systems that leverage unmanned aerial vehicles (UAVs). Four distinct modes are considered: (1) direct drone deliveries from a fixed depot; (2) drone deliveries from parked trucks that carry bulk parcels to customer neighborhoods; (3) drone deliveries from nonstopping trucks that tour customer neighborhoods; and (4) as a benchmark, traditional truck-based home deliveries. We present a new continuum-approximation approach that is used for analysis of both truck routing and aerial-UAV traffic. We compared the operational cost and efficiency of different delivery schemes to reveal how a certain scheme is the most efficient under various scenarios. We demonstrate the applicability of our model on expansive real-world roadway networks and further conduct analysis on grid networks, yielding key analytical insights. The drone-based delivery is demonstrated to be superior to conventional truck-only delivery, suggesting a significant potential for socioeconomic benefit. It is observed that when servicing a relatively low demand over a small area, dispatching drones directly from the distribution facility is the most efficient method. As the demand grows or spans a wider area, collaborative strategies are preferred, as they better cope with certain aspects, such as the long line-haul cost or the ramping aerial congestion, by striking a balance between efficiency and flexibility.

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Lehnert, J., J. Shea, N. Shroff, W. Stark, and T. Wong. Utilizing Spectrum Efficiently (USE). Fort Belvoir, VA: Defense Technical Information Center, February 2011. http://dx.doi.org/10.21236/ada563687.

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Thorn, R. P. Jr, P. S. Monks, L. J. Stief, S. C. Kuo, Z. Zhang, and R. B. Klemm. A preliminary report on the photoionization efficiency spectrum, ionization energy and heat of formation of Br{sub 2}O; and the appearance energy of BrO{sup +} (Br{sub 2}O). Office of Scientific and Technical Information (OSTI), August 1995. http://dx.doi.org/10.2172/96851.

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Yunovich and Thompson. L51886 Performance of Magnesium Anodes. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), May 2003. http://dx.doi.org/10.55274/r0010391.

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Magnesium anodes are provided to the corrosion control industry by a number of domestic and international manufacturers and distributors. Due to the difficulty and time involved in performance testing, anode composition is commonly the only criterion used for quality control by the end users. However, experience has shown that compliance of the anode chemical composition with the ASTM B843 Standard Specification for Magnesium Alloy Anodes for Cathodic Protection can be misleading and does not always differentiate between the anodes of different quality. Thousands of magnesium anodes are produced annually and provided by a number of suppliers to the corrosion control industry. Though the composition of the anodes from the various sources is comparable, the performance of the magnesium anodes is often radically different. Many of these materials have been shown to meet the compositional and potential specifications, and yet have had measured efficiencies as low as 7%. The objectives of this project were: (1) to develop quality and performance standards determined by laboratory tests and field exposures. The project included testing a variety of anodes submitted by the manufacturers/distributors and the end users, representing all spectrum of the ASTM G97 Standard Test Method-based efficiency values; the anodes were characterized with respect to the Anode source, manufacturing process, macrostructure, chemical composition, anode type (standard/H-1 family /AZ63 family versus high-potential), and microstructure. Other investigations comprised assessment of the ASTM G97 Standard Test Method parameters that were most likely to make the most significant impact on the resulting anode efficiency values, e.g., testing environment (standard testing solution and saturated backfill), and current density (the low 1/10th of the standard'), the ASTM G97 standard, and the high (10X standard) values). Testing in saturated backfill was used for a comparison between the laboratory- and the field-based efficiencies.

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Choi, Junoh, Alvaro Cruz-Cabrera, and Anthony Tanbakuchi. Spectral diffraction efficiency characterization of broadband diffractive optical elements. Office of Scientific and Technical Information (OSTI), March 2013. http://dx.doi.org/10.2172/1095948.

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Goncharoff, V., E. VonColln, and R. Morris. Efficient Calculation of Spectral Tilt from Various LPC Parameters,. Fort Belvoir, VA: Defense Technical Information Center, May 1996. http://dx.doi.org/10.21236/ada308580.

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Osterwald, C. R., M. W. Wanlass, T. Moriarty, M. A. Steiner, and K. A. Emery. Effects of Spectral Error in Efficiency Measurements of GaInAs-Based Concentrator Solar Cells. Office of Scientific and Technical Information (OSTI), March 2014. http://dx.doi.org/10.2172/1126836.

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Tabor, Steven. Spectral and Spatial Quantum Efficiency of AlGaAs/GaAs and InGaAs/InP PIN Photodiodes. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.6644.

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