Bibliografie tematiche / Cooperative diversity

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Letteratura scientifica selezionata sul tema "Cooperative diversity"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 20 febbraio 2023

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Articoli di riviste sul tema "Cooperative diversity"

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Sasongko, Adrian Tri, Yeti Lis Purnamadewi e Sri Mulatsih. "ANALISIS KEUNGGULAN KOMPARATIF DAN FAKTOR YANG MEMPENGARUHI KINERJA KOPERASI DI PULAU JAWA". JURNAL EKONOMI DAN KEBIJAKAN PEMBANGUNAN 6, n. 2 (31 luglio 2018): 90–106. http://dx.doi.org/10.29244/jekp.6.2.2017.90-106.

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Abstract (sommario):
Development of cooperatives is an important element that must be done in order to realize the national economic development because the cooperative able to accommodate the community in achieving the goal of improving the welfare of the people based on the principle of mutual cooperation. Differences in regional characteristics lead to diversity in the development and development of cooperatives. Java Island with rapid economic growth, able to build cooperatives in large numbers but the performance of cooperatives and growth is still fluctuating. Therefore, this study aims to determine the comparative advantage in cooperative development and analyze the factors that affect the performance of cooperatives in Java. This research uses secondary data with Method of Econometrika Data Panel and Method of Economic Performance Index of Regional Cooperation (PEKR Index). The results showed that the provinces of Central Java and Yogyakarta have a comparative advantage in the economic development of cooperatives in 2011-2015. Factors affecting the performance of the cooperative is the number of active cooperatives, the number of cooperative employees, own capital cooperatives and PDRB. Keywords: Comparative advantage, Cooperative, Performance, Panel data
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Sasongko, Adrian Tri, Yeti Lis Purnamadewi e Sri Mulatsih. "ANALISIS KEUNGGULAN KOMPARATIF DAN FAKTOR YANG MEMPENGARUHI KINERJA KOPERASI DI PULAU JAWA". JURNAL EKONOMI DAN KEBIJAKAN PEMBANGUNAN 6, n. 2 (31 luglio 2018): 90–106. http://dx.doi.org/10.29244/jekp.6.2.90-106.

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Abstract (sommario):
Development of cooperatives is an important element that must be done in order to realize the national economic development because the cooperative able to accommodate the community in achieving the goal of improving the welfare of the people based on the principle of mutual cooperation. Differences in regional characteristics lead to diversity in the development and development of cooperatives. Java Island with rapid economic growth, able to build cooperatives in large numbers but the performance of cooperatives and growth is still fluctuating. Therefore, this study aims to determine the comparative advantage in cooperative development and analyze the factors that affect the performance of cooperatives in Java. This research uses secondary data with Method of Econometrika Data Panel and Method of Economic Performance Index of Regional Cooperation (PEKR Index). The results showed that the provinces of Central Java and Yogyakarta have a comparative advantage in the economic development of cooperatives in 2011-2015. Factors affecting the performance of the cooperative is the number of active cooperatives, the number of cooperative employees, own capital cooperatives and PDRB. Keywords: Comparative advantage, Cooperative, Performance, Panel data
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Shuangqing Wei, D. L. Goeckel e M. C. Valenti. "Asynchronous cooperative diversity". IEEE Transactions on Wireless Communications 5, n. 6 (giugno 2006): 1547–57. http://dx.doi.org/10.1109/twc.2006.1638675.

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Ju, MinChul, Il-Min Kim e Dong In Kim. "Opportunistic Source/Destination Cooperation in Cooperative Diversity Networks". IEEE Transactions on Wireless Communications 9, n. 12 (dicembre 2010): 3822–37. http://dx.doi.org/10.1109/twc.2010.100110.100307.

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Sun, Xiao Jin, e Zhi Wen Hu. "Research on Wireless Communication Technology Based on Cooperative Diversity". Applied Mechanics and Materials 416-417 (settembre 2013): 1561–64. http://dx.doi.org/10.4028/www.scientific.net/amm.416-417.1561.

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Abstract (sommario):
Cooperative diversity technique refers to that in the context of multi-users, several single antenna terminals create a virtual multi-antenna system to realize the dispatch and diversity of the periodic line by means of share each others antenna. The remarkable strong point of the cooperative diversity technique is that it can reduce the transmission power of the system, improve its handing capacity and effectively decrease its error rate. This paper is going to analyze the application of the cooperative diversity technique on the wireless communication technology and present the main problems of the cooperative diversify technique by introducing the related conceptions of the cooperative diversity technique.
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Shea, John M., Tan F. Wong e Wing-Hin Wong. "Cooperative-diversity slotted ALOHA". Wireless Networks 13, n. 3 (3 luglio 2006): 361–69. http://dx.doi.org/10.1007/s11276-006-7531-0.

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Ji, Wei, e Bao-yu Zheng. "Enhanced cooperative packet retransmission employing joint cooperative diversity and symbol mapping diversity". Journal of Zhejiang University-SCIENCE A 9, n. 8 (agosto 2008): 1090–98. http://dx.doi.org/10.1631/jzus.a0720076.

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Calle, Félix, Ángela González-Moreno, Inmaculada Carrasco e Manuel Vargas-Vargas. "Social Economy, Environmental Proactivity, Eco-Innovation and Performance in the Spanish Wine Sector". Sustainability 12, n. 15 (22 luglio 2020): 5908. http://dx.doi.org/10.3390/su12155908.

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Abstract (sommario):
Concerned about climate change, cooperatives in the wine sector are beginning to adapt their strategies, guided by cooperative principles that encompass high social responsibility and the pursuit of community values. In this context and focused on the analysis of the decisions that drive firms to be more environmentally sustainable, our goal is twofold. On the one hand, we wish to examine whether there exist differences between cooperative and non-cooperative firms as regards their environmental proactivity. On the other hand, we hope to demonstrate the diversity of behaviors within the category of cooperative firms, identifying the possible patterns of environmental proactivity in Spanish cooperatives in the wine sector. We first conducted a difference of means t-test for independent samples (n = 251; sampled in 2017)—cooperatives (51) vs. non cooperative firms (200)- and then a two-stage cluster analysis and a subsequent variance analysis, using SPSS 24. Our results show no significant differences between cooperative and non-cooperative firms concerning their environmental behavior and underlines the diversity within the cooperatives in the wine sector as regards their environmental proactivity, revealing the existence of proactive, preventive and activist patterns of behavior. These patterns also show differences in the motivations for their environmental behaviors and their assessment of financial performance.
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Mahmood, A. "Cooperative Diversity in Wireless Networks". Journal of Engineering Science and Technology Review 3, n. 1 (giugno 2010): 184–87. http://dx.doi.org/10.25103/jestr.031.30.

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Host-Madsen, A. "Capacity bounds for Cooperative diversity". IEEE Transactions on Information Theory 52, n. 4 (aprile 2006): 1522–44. http://dx.doi.org/10.1109/tit.2006.871576.

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Tesi sul tema "Cooperative diversity"

1

Guerrero, Laura Yadira. "Cooperative diversity for distributed multicarrier relaying systems". Thesis, King's College London (University of London), 2017. https://kclpure.kcl.ac.uk/portal/en/theses/cooperative-diversity-for-distributed-multicarrier-relaying-systems(773aaeec-11e4-43b7-a1ff-cd3a86644a52).html.

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Abstract (sommario):
We introduce a Cooperative Distributed Multistage Spatial Diversity (CDMSD) scheme. By means of prior derived relaying topologies our algorithm relies on a robust and low complexity transceiver entity. CDMSD is implemented such as to improve throughput enhancement, coverage extension and spectral efficiency improvement. The benefits are provided by achieving full diversity and frequency selectivity. Simulation results are presented and compare to traditional non-distributed networks to support the analytical framework. Additionally fractional frame duration and transmitted power control are implemented to achieve higher data transmission rates. Providing a performance near optimum, our protocol has gained significantly in research momentum, mainly due to its ability to boost capacity and its inherent attribute of scalability to ad hoc and wireless sensor networks. CDMSD makes full use of MC-CDMA frequency domain spreading properties by introducing immerse collaboration and distributed frequency diversity in a multi-hop network architecture which has drawn much attention in industry and academia in terms of reliable performance.
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Moço, Andreia Vieira. "Cooperative diversity schemes for wireless communication systems". Master's thesis, Universidade de Aveiro, 2008. http://hdl.handle.net/10773/2055.

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Abstract (sommario):
Mestrado em Engenharia Electrónica e Telecomunicações
A presente dissertação insere-se na área das comunicações sem fios, ou mais especificamente na temática da diversidade cooperativa. Neste trabalho é feito o estudo, implementação e avaliação do desempenho de esquemas de diversidade cooperativa de baixa complexidade para sistemas de comunicação móvel. Estes esquemas são mapeados em modelos de simulação baseados em OFDMA e são completamente simulados em CoCentric System Studio. Os resultados obtidos com os modelos desenvolvidos mostram que os esquemas de diversidade cooperativa atenuam os efeitos do desvanecimento induzido pela propagação multipercurso, aumentando desta forma a capacidade e cobertura dos sistemas wireless. Os ganhos são particularmente altos quando as perdas de percurso são consideráveis, como é o caso das zonas urbanas densas. ABSTRACT: This dissertation is inserted into the wireless communication, or more specifically, into the cooperative diversity field. within this thesis, the performance of low-complexity cooperative diversity schemes projected for mobile communication systems are studied, implemented and evaluated. These schemes are mapped into simulation models based on OFDMA and are fully simulated in the CoCentric System Studio environment. The obtained results show that the proposed cooperative schemes for the uplink communication mitigate fading induced by multipath propagation, thereby increasing the capacity and coverage of wireless systems. Cooperation gains are particularly high when multipath losses are considerable, as is the case for dense urban regions.
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Teodoro, Sara Helena Marques. "Distributed coding for systems with cooperative diversity". Doctoral thesis, Universidade de Aveiro, 2011. http://hdl.handle.net/10773/6045.

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Abstract (sommario):
Doutoramento em Engenharia Electrotécnica
O presente trabalho propõe-se a divulgar as mais significativas técnicas de esquemas cooperativos, de forma a ultrapassar alguns dos problemas dos sistemas móveis sem fios da próxima geração, estendendo a área de cobertura destes sistemas, assim como a sua capacidade e fiabilidade. O estudo de diversos esquemas cooperativos é efetuado em termos de capacidade e de taxa de erros, fazendo variar o número de relays e de antenas em cada elemento do sistema. Diversos algoritmos com aplicação em sistemas cooperativos são desenvolvidos e propostos ao longo desta tese, como códigos espaço-frequência aplicados de forma distribuída nos relays, para sistemas baseados na tecnologia OFDM e sob diversos cenários próximos da realidade. Os sistemas cooperativos são particularmente úteis em situações em que o caminho direto entre dois terminais não está acessível ou tem uma fraca qualidade de transmissão. Tendo este aspeto em consideração, e pretendendo ter a máxima eficiência espetral e máxima diversidade, um algoritmo com precodificação é também proposto para múltiplos relays, cada um equipado com uma ou duas antenas. A formulação matemática associada aos algoritmos propostos é apresentada, assim como a derivação da probabilidade de erro teórica. O desempenho dos sistemas assistidos por relays usando os algoritmos propostos é comparado em relação a outros esquemas cooperativos equivalentes e a esquemas não-cooperativos, considerando cenários com diferentes qualidades de canal, daí advindo importantes conclusões em relação a estes sistemas.
Cooperative schemes are promising solutions for cellular wireless networks aiming to improve system fairness, extend coverage and increase capacity. Measurements of these system performances are made in terms of BER and capacity for different configurations, by varying the number of relays and of antennas equipping each node. In this work we propose and evaluate distributed space-frequency codes applied to cooperative systems in a distributed way, with application in OFDM systems and considering realistic scenarios. Moreover, the use of relays is of significant interest to allow radio access in situations where a direct path is not available or has poor quality. Thus, a data precoded relay-assisted scheme is also proposed for a system cooperating with multiple relays, each equipped with either a single antenna or two-antenna array. Mathematical formulation of the proposed algorithms is derived as well as the pairwise error probability. We further present the performances of the proposed algorithms apllied in relay-assisted schemes, and compare them with equivalent cooperative and non-cooperative schemes, for several channel quality scenarios, through which important conclusions are achieved.
FCT/FSE
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Laneman, J. Nicholas. "Cooperative diversity in wireless networks : algorithms and architectures". Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/29272.

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Abstract (sommario):
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.
Includes bibliographical references (p. 179-187).
To effectively combat multipath fading across multiple protocol layers in wireless networks, this dissertation develops energy-efficient algorithms that employ certain kinds of cooperation among terminals, and illustrates how one might incorporate these algorithms into various network architectures. In these techniques, sets of terminals relay signals for each other to create a virtual antenna array, trading off the costs-in power, bandwidth, and complexity-for the greater benefits gained by exploiting spatial diversity in the channel. By contrast, classical network architectures only employ point-to-point transmission and thus forego these benefits. After summarizing a model for the wireless channel, we present various practical cooperative diversity algorithms based upon different types of relay processing and re-encoding, both with and without limited feedback from the ultimate receivers. Using information theoretic tools, we show that all these algorithms can achieve full spatial diversity, as if each terminal had as many transmit antennas as the entire set of cooperating terminals. Such diversity gains translate into greatly improved robustness to fading for the same transmit power, or substantially reduced transmit power for the same level of performance. For example, with two cooperating terminals, power savings as much as 12 dB (a factor of sixteen) are possible for outage probabilities around one in a thousand. Finally, we discuss how the required level of complexity in the terminals makes different algorithms suitable for particular network architectures that arise in, for example, current cellular and ad-hoc networks.
by J. Nicholas Laneman.
Ph.D.
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Bletsas, Aggelos Anastasiou 1975. "Intelligent antenna sharing in cooperative diversity wireless networks". Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/33876.

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Abstract (sommario):
Thesis (Ph. D.)--Massachusetts Institute of Technology, School of Architecture and Planning, Program in Media Arts and Sciences, 2005.
Includes bibliographical references (p. 143-152).
Cooperative diversity has been recently proposed as a way to form virtual antenna arrays that provide dramatic gains in slow fading wireless environments. However, most of the proposed solutions require simultaneous relay transmissions at the same frequency bands, using distributed space-time coding algorithms. Careful design of distributed space-time coding for the relay channel is usually based on global knowledge of some network parameters or is usually left for future investigation, if there is more than one cooperative relay. We propose a novel scheme that eliminates the need for space-time coding and provides diversity gains on the order of the number of relays in the network. Our scheme first selects the best relay from a set of M available relays and then uses this "best" relay for cooperation between the source and the destination. Information theoretic analysis of outage probability shows that our scheme achieves the same diversity-multiplexing gain tradeoff as achieved by more complex protocols, where coordination and distributed space-time coding for M relay nodes is required. Additionally, the proposed scheme increases the outage and ergodic capacity, compared to non-cooperative communication with increasing number of participating relays, at the low SNR regime and under a total transmission power constraint.
(cont.) Coordination among the participating relays is based on a novel timing protocol that exploits local measurements of the instantaneous channel conditions. The method is distributed and allows for fast selection of the best relay as compared to the channel coherence time. In addition, a methodology to evaluate relay selection performance for any kind of wireless channel statistics is provided. Other methods of network coordination, inspired by natural phenomena of decentralized time synchronization, are analyzed in theory and implemented in practice. It was possible to implement the proposed, virtual antenna formation technique in a custom network of single antenna, half-duplex radios.
by Aggelos Anastasiou Bletsas.
Ph.D.
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Jardine, Allan. "Cooperative diversity in wireless networks : frameworks and analysis". Thesis, University of Edinburgh, 2007. http://hdl.handle.net/1842/12284.

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Abstract (sommario):
In spatial diversity, independently fading signals can be received by antenna elements separated by a small distance. Combining of the received signals can lead to an increase in the capacity and reliability of communications over the wireless channel. Spatial diversity can be achieved in a cellular network by sharing information between Mobile Terminals (MTs) where one MT acts as a relay supporting the data transmitted from the source in the first instance by forwarding information to the destination in the second instance. Due to the cooperation between MTs this is termed cooperative diversity. Initially this thesis considers the effect of cooperative diversity in an environment where MTs are equipped with two antenna elements, effectively combining the fast-fading combating techniques of cooperative diversity and multiple-antennas. Cooperative diversity transmission can be performed by a number of different protocols, which are termed Protocols I-V. Imposing system constraints on the network in order to make a fair comparison between the protocols, in-particular the traditional single-hop channel, allows the benefits of cooperative diversity to fully be established. An information theory approach is developed using multiple antenna techniques to provide a framework for cooperative diversity. It is shown that cooperative diversity can offer significant improvements in terms of probability of outage and capacity. In-particular, an adaptive cooperative diversity protocol is developed to select the optimal protocol dependent on channel conditions which shows a 4.25dB increase in capacity, at the 5% outage level, for a single user.
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Vien, Quoc-Tuan. "Cooperative diversity techniques for high-throughput wireless relay networks". Thesis, Glasgow Caledonian University, 2013. http://eprints.mdx.ac.uk/11685/.

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Relay communications has attracted a growing interest in wireless communications with application to various enhanced technologies. This thesis considers a number of issues related to data throughput in various wireless relay network models. Particularly, new implementations of network coding (NC) and space-time coding (STC) techniques are investigated to offer various means of achieving high-throughput relay communications. Firstly, this thesis investigates different practical automatic repeat request (ARQ) retransmission protocols based on NC for two-way wireless relay networks to improve throughput efficiency. Two improved NC-based ARQ schemes are designed based on go-back-N and selective-repeat (SR) protocols. Addressing ARQ issues in multisource multidestination relay networks, a new NC-based ARQ protocol is proposed and two packet-combination algorithms are developed for retransmissions at relay and sources to significantly improve the throughput. In relation to the concept of channel quality indicator (CQI) reporting in two-way relay networks, two new efficient CQI reporting schemes are designed based on NC to improve the system throughput by allowing two terminals to simultaneously estimate the CQI of the distant terminal-relay link without incurring additional overhead. The transmission time for CQI feedback at the relays is reduced by half while the increase in complexity and the loss of performance are shown to be negligible. Furthermore, a low-complexity relay selection scheme is suggested to reduce the relay searching complexity. For the acknowledgment (ACK) process, this thesis proposes a new block ACK scheme based on NC to significantly reduce the ACK overheads and therefore produce an enhanced throughput. The proposed scheme is also shown to improve the reliability of block ACK transmission and reduce the number of data retransmissions for a higher system throughput. Additionally, this thesis presents a new cooperative retransmission scheme based on relay cooperation and NC to considerably reduce the number of retransmission packets and im- prove the reliability of retransmissions for a more power efficient and higher throughput system with non-overlapped retransmissions. Moreover, two relay selection schemes are recommended to determine the optimised number of relays for the retransmission. Finally, with respect to cognitive wireless relay networks (CWRNs), this thesis proposes a new cooperative spectrum sensing (CSS) scheme to improve the spectrum sensing performance and design a new CSS scheme based on NC for three-hop CWRNs to improve system throughput. Furthermore, a new distributed space-time-frequency block code (DSTFBC) is designed for a two- hop nonregenerative CWRN over frequency-selective fading channels. The proposed DSTFBC design achieves higher data rate, spatial diversity gain, and decoupling detection of data blocks at all destination nodes with a low-complexity receiver structure.
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Neves, Darlene Maciel. "Channel estimation and parameters acquisition systems employing cooperative diversity". Doctoral thesis, Universidade de Aveiro, 2013. http://hdl.handle.net/10773/11963.

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Abstract (sommario):
Doutoramento em Engenharia Eletrotécnica e Telecomunicações
This work investigates new channel estimation schemes for the forthcoming and future generation of cellular systems for which cooperative techniques are regarded. The studied cooperative systems are designed to re-transmit the received information to the user terminal via the relay nodes, in order to make use of benefits such as high throughput, fairness in access and extra coverage. The cooperative scenarios rely on OFDM-based systems employing classical and pilot-based channel estimators, which were originally designed to pointto-point links. The analytical studies consider two relaying protocols, namely, the Amplifyand-Forward and the Equalise-and-Forward, both for the downlink case. The relaying channels statistics show that such channels entail specific characteristics that comply to a proper filter and equalisation designs. Therefore, adjustments in the estimation process are needed in order to obtain the relay channel estimates, refine these initial estimates via iterative processing and obtain others system parameters that are required in the equalisation. The system performance is evaluated considering standardised specifications and the International Telecommunication Union multipath channel models.
Este trabalho tem por objetivo o estudo de novos esquemas de estimação de canal para sistemas de comunicação móvel das próximas gerações, para os quais técnicas cooperativa são consideradas. Os sistemas cooperativos investigados neste trabalho estão projetados para fazerem uso de terminais adicionais a fim de retransmitir a informação recebida para o utilizador final. Desta forma, pode-se usurfruir de benefícios relacionados às comunicações cooperativas tais como o aumento do rendimento do sistema, fiabilidade e extra cobertura. Os cenários são basedos em sistemas OFDM que empregam estimadores de canal que fazem uso de sinais piloto e que originalmente foram projetados para ligações ponto a ponto. Os estudos analíticos consideram dois protocolos de encaminhamento, nomeadamente, Amplify-and-Forward e Equalise-and-Forward, ambos para o caso downlink. As estatísticas dos canais em estudo mostram que tais canais ocasionam características específicas para as quais o filtro do estimador e a equalisação devem ser apropridamente projetados. Estas características requerem ajustes que são necessários no processo de estimação a fim de estimar os canais, refinar as estimativas iniciais através de processos iterativos e ainda obter outros parâmetros do sistema que são necessários na equalização. O desempenho dos esquemas propostos são avaliados tendo em consideração especificações padronizadas e modelos de canal descritos na International Telecommunication Union.
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Perera, Ovitigalage Prasad Nalaka. "Cooperative diversity for performance enhancement of vehicular ad hoc networks". Thesis, Queensland University of Technology, 2015. https://eprints.qut.edu.au/87980/1/Ovitigalage%20Prasad%20Nalaka_Perera_Thesis.pdf.

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Abstract (sommario):
This project was a step forward in introducing suitable cooperative diversity transmission techniques for vehicle to vehicle communications. The contributions are intended to aid in the successful implementation of future vehicular safety and autonomous controlling systems. Several protocols were introduced for vehicles to communicate effectively without losing connectivity. This study investigated novel protocols in terms of diversity-multiplexing trade-off and outage for a range of potential vehicular safety and infotainment applications.
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Ni, Min. "Cooperative Distributed Transmission and Reception". Digital WPI, 2013. https://digitalcommons.wpi.edu/etd-dissertations/325.

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Abstract (sommario):
" In telecommunications, a cooperative scheme refers to a method where two or more users share or combine their information in order to increase diversity gain or power gain. In contrast to conventional point-to-point communications, cooperative communications allow different users in a wireless network to share resources so that instead of maximizing the performance of its own link, each user collaborates with its neighbours to achieve an overall improvement in performance. In this dissertation, we consider different models for transmission and reception and explore cooperative techniques that increase the reliability and capacity gains in wireless networks, with consideration to practical issues such as channel estimation errors and backhaul constraints. This dissertation considers the design and performance of cooperative communication techniques. Particularly, the first part of this dissertation focuses on the performance comparison between interference alignment and opportunistic transmission for a 3-user single-input single- output (SISO) interference channel in terms of average sum rate in the presence of channel estimation errors. In the case of interference alignment, channel estimation errors cause interference leakage which consequently results in a loss of achievable rate. In the case of opportunistic transmission, channel estimation errors result in a non-zero probability of incorrectly choosing the node with the best channel. The effect of these impairments is quantified in terms of the achievable average sum rate of these transmission techniques. Analysis and numerical examples show that SISO interference alignment can achieve better average sum rate with good channel estimates and at high SNR whereas opportunistic transmission provides better performance at low SNR and/or when the channel estimates are poor. We next considers the problem of jointly decoding binary phase shift keyed (BPSK) messages from a single distant transmitter to a cooperative receive cluster connected by a local area network (LAN). An approximate distributed receive beamforming algorithm is proposed based on the exchange of coarsely- quantized observations among some or all of the nodes in the receive cluster. By taking into account the differences in channel quality across the receive cluster, the quantized information from other nodes in the receive cluster can be appropriately combined with locally unquantized information to form an approximation of the ideal receive beamformer decision statistic. The LAN throughput requirements of this technique are derived as a function of the number of participating nodes in the receive cluster, the forward link code rate, and the quantization parameters. Using information-theoretic analysis and simulations of an LDPC coded system in fading channels, numerical results show that the performance penalty (in terms of outage probability and block error rate) due to coarse quantization is small in the low SNR regimes enabled by cooperative distributed reception. An upper/lower bound approximation is derived based on a circle approximation in the channel magnitude domain which provides a pretty fast way to compute the outage probability performance for a system with arbitrary number of receivers at a given SNR. In the final part of this dissertation, we discuss the distributed reception technique with higher- order modulation schemes in the forward link. The extension from BPSK to QPSK is straightforward and is studied in the second part of this dissertation. The extension to 8PSK, 4PAM and 16QAM forward links, however, is not trivial. For 8PSK, two techniques are proposed: pseudobeamforming and 3-bit belief combining where the first one is intuitive and turns out to be suboptimal,the latter is optimal in terms of outage probability performance. The idea of belief combining can be applied to the 4PAM and 16QAM and it is shown that better/finer quantizer design can further improve the block error rate performance. Information-theoretic analysis and numerical results are provided to show that significant reliability and SNR gains can be achieved by using the proposed schemes. "
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Più fonti

Libri sul tema "Cooperative diversity"

1

W, Putnam JoAnne, a cura di. Cooperative learning and strategies for inclusion: Celebrating diversity in the classroom. Baltimore: Paul H. Brookes Pub. Co., 1993.

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2

Bento, Maria Aparecida Silva, e Marilda Castelar. Inclusão no trabalho: Desafios e perspectivas. São Paulo, SP, Brasil: CEERT, 2001.

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3

Stefanelli, Renzo. Il capitale ben temperato: Diversità coop e vitalità del mercato. Roma: Liocorno, 1994.

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4

Schülke, Alexander. Biodiversity in German development cooperation. 7a ed. Heidelberg: Kasparek, 2008.

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5

Schülke, Alexander. Biodiversity in German development cooperation. 7a ed. Heidelberg: Kasparek, 2008.

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6

Co.Ind: Un successo costruito sulla diversità. Bologna: Il Mulino, 2001.

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7

Schermers, Henry G. International institutional law: Unity within diversity. 5a ed. Boston: Martinus Nijhoff Publishers, 2011.

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8

J, Soeters, e Manigart Philippe, a cura di. Military cooperation in multinational peace operations: Managing cultural diversity and crisis response. London: Routledge, 2008.

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Chaturvedi, Sachin. A framework of cooperation in conservation of biodiversity in South Asia: Profile of issues and challenges. New Delhi: Research and Information System for the Non-aligned and Other Developing Countries, 2001.

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Schermers, Henry G. International institutional law: Unity within diversity. 3a ed. The Hague: M. Nijhoff, 1995.

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Capitoli di libri sul tema "Cooperative diversity"

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Atapattu, Saman, Chintha Tellambura e Hai Jiang. "Diversity Techniques and Cooperative Networks". In Energy Detection for Spectrum Sensing in Cognitive Radio, 63–83. New York, NY: Springer New York, 2014. http://dx.doi.org/10.1007/978-1-4939-0494-5_5.

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Pescarmona, Isabella. "Giving Voice to Diversity". In Contemporary Global Perspectives on Cooperative Learning, 71–81. New York: Routledge, 2023. http://dx.doi.org/10.4324/9781003268192-8.

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Feldman, Robert. "Contributing to a cooperative workplace/diversity". In Professionalism and Values in Law Practice, 89–92. Milton Park, Abingdon, Oxon; New York, NY:: Routledge, 2020. http://dx.doi.org/10.4324/9780429244704-19.

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Ayadi, Rym. "Banks’ Business Models in Europe: Are Cooperative Banks Different?" In Institutional Diversity in Banking, 51–72. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-42073-8_3.

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Pintea, C. M., C. Chira e D. Dumitrescu. "Sensitive Ants: Inducing Diversity in the Colony". In Nature Inspired Cooperative Strategies for Optimization (NICSO 2008), 15–24. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-03211-0_2.

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Ismail, Adiel, e Andries P. Engelbrecht. "Measuring Diversity in the Cooperative Particle Swarm Optimizer". In Lecture Notes in Computer Science, 97–108. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-32650-9_9.

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Rahmati, Alireza, e Alagan Anpalagan. "Maximum Multipath Diversity in Coded Cooperative Relay Networks". In 30th Biennial Symposium on Communications 2021, 263–72. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-06947-5_20.

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Akinsoyinu, Clements A. "Cooperative Banks: Is Demutualization an Answer? The Experience of Building Societies in the UK". In Institutional Diversity in Banking, 73–100. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-42073-8_4.

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Kil, Krzysztof, e Ewa Miklaszewska. "The Competitive Threats and Strategic Challenges to Polish Cooperative Banks: A Post Crisis Perspective". In Institutional Diversity in Banking, 121–46. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-42073-8_6.

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Joshi, Aparna, e Susan E. Jackson. "Managing Workforce Diversity to Enhance Cooperation in Organizations". In International Handbook of Organizational Teamwork and Cooperative Working, 277–96. Chichester, UK: John Wiley & Sons Ltd, 2008. http://dx.doi.org/10.1002/9780470696712.ch14.

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Atti di convegni sul tema "Cooperative diversity"

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Deng, Weihua, e Xiqi Gao. "Cooperative Diversity with Partially Cooperative Relays". In 2009 5th International Conference on Wireless Communications, Networking and Mobile Computing (WiCOM). IEEE, 2009. http://dx.doi.org/10.1109/wicom.2009.5303125.

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Ji, Wei, Bao-yu Zheng e Cui Jing-wu. "Joint cooperation diversity and symbol mapping diversity in cooperative communication systems". In 2007 5th International Conference on Communications, Circuits and Systems. IEEE, 2007. http://dx.doi.org/10.1109/icccas.2007.6247575.

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Kandasamy, Durga M., Kristal Curtis, Armando Fox e David Patterson. "Diversity within the crowd". In CSCW '12: Computer Supported Cooperative Work. New York, NY, USA: ACM, 2012. http://dx.doi.org/10.1145/2141512.2141556.

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Hamilton, B. R., e X. Ma. "Noncooperative Routing with Cooperative Diversity". In 2007 IEEE International Conference on Communications. IEEE, 2007. http://dx.doi.org/10.1109/icc.2007.699.

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Bletsas, A., Hyundong Shin, M. Z. Win e A. Lippman. "Cooperative diversity with opportunistic relaying". In IEEE Wireless Communications and Networking Conference, 2006. WCNC 2006. IEEE, 2006. http://dx.doi.org/10.1109/wcnc.2006.1683612.

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Oruc, Ozgur, e Umit Aygolu. "Cooperative Diversity with Coordinate Interleaving". In 2007 IEEE 15th Signal Processing and Communications Applications. IEEE, 2007. http://dx.doi.org/10.1109/siu.2007.4298839.

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Dehnie, Sintayehu, e Nasir Memon. "Cooperative diversity with selfish users". In 2008 42nd Annual Conference on Information Sciences and Systems (CISS). IEEE, 2008. http://dx.doi.org/10.1109/ciss.2008.4558698.

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Meier, A. "Cooperative diversity in wireless networks". In 6th IEE International Conference on 3G and Beyond (05/11182). IEE, 2005. http://dx.doi.org/10.1049/cp:20050189.

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Karumur, Raghav Pavan, Tien T. Nguyen e Joseph A. Konstan. "Early Activity Diversity". In CSCW '16: Computer Supported Cooperative Work and Social Computing. New York, NY, USA: ACM, 2016. http://dx.doi.org/10.1145/2818048.2820009.

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Dong, Wei, Kate Ehrlich, Michael M. Macy e Michael Muller. "Embracing Cultural Diversity". In CSCW '16: Computer Supported Cooperative Work and Social Computing. New York, NY, USA: ACM, 2016. http://dx.doi.org/10.1145/2818048.2835198.

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Rapporti di organizzazioni sul tema "Cooperative diversity"

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Shakya, B., E. Sharma, J. Gurung e N. Chettri. The Landscape Approach in Biodiversity Conservation; A Regional Cooperation Framework for Implementation of the Convention on Biological Diversity in the Kangchenjunga Landscape. Kathmandu, Nepal: International Centre for Integrated Mountain Development (ICIMOD), 2007. http://dx.doi.org/10.53055/icimod.479.

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Shakya, B., E. Sharma, J. Gurung e N. Chettri. The Landscape Approach in Biodiversity Conservation; A Regional Cooperation Framework for Implementation of the Convention on Biological Diversity in the Kangchenjunga Landscape. Kathmandu, Nepal: International Centre for Integrated Mountain Development (ICIMOD), 2007. http://dx.doi.org/10.53055/icimod.479.

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Keinan, Ehud. The 18th Asian Chemical Congress and the 20th General Assembly of the FACS. AsiaChem Magazine, novembre 2020. http://dx.doi.org/10.51167/acm00015.

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Most global challenges, including global warming, food for everybody, the race for sustainable energy, water quality, dwindling raw materials, and health problems, are chemical problems by nature. Therefore, Humankind cannot meet these challenges without the chemical sciences and will not solve any of these problems without global cooperation. Chemists have always been doing much better than politicians in meeting these challenges, working together across borders through unique collaboration and friendship. Despite fundamentally different political systems and cultural diversity, chemists go beyond borders, find each other, share their findings, and solve problems together.
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Maletta, Giovanna, e Mike Lewis. Post-shipment On-site Inspections and Stockpile Management Assistance: Bridging Gaps. Stockholm International Peace Research Institute, agosto 2022. http://dx.doi.org/10.55163/ulfp1679.

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Post-shipment on-site inspections and international assistance in physical security and stockpile management (PSSM) have different scopes and objectives. On-site inspections allow exporting states to check exported military materiel to ensure that the importer is complying with its commitments, while PSSM assistance aims to improve states’ weapons and ammunition management systems. However, both instruments allow foreign specialists to visit a state’s weapons and ammunition storage facilities and enable information gathering to assess their integrity and identify possible diversion risks. This policy brief highlights that building informal linkages between these instruments, especially with regard to states and actors that conduct inspections and are involved in funding or implementing PSSM assistance, could contribute towards establishing more comprehensive forms of post-shipment cooperation. In addition, applying lessons learned from PSSM assistance in terms of gaining access to states’ facilities, cooperating with the beneficiary importing states, and identifying limitations and opportunities associated with the use of tracking technologies could help to address some of the challenges encountered when conducting on-site inspections. PSSM assistance programmes could also include modules to raise awareness about on-site inspections and be a source of expertise that could assist states when implementing these controls.
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Terrón-Caro, María Teresa, Rocio Cárdenas-Rodríguez, Fabiola Ortega-de-Mora, Kassia Aleksic, Sofia Bergano, Patience Biligha, Tiziana Chiappelli et al. Policy Recommendations ebook. Migrations, Gender and Inclusion from an International Perspective. Voices of Immigrant Women, luglio 2022. http://dx.doi.org/10.46661/rio.20220727_1.

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Abstract (sommario):
This publication is the third product of the Erasmus + Project entitled Voices of Immigrant Women (Project Number: 2020-1-ES01-KA203-082364). This product is based on a set of policy recommendations that provides practical guidance on intervention proposals to those with political responsibilities in governance on migration management and policies for integration and social inclusion, as well as to policy makers in the governance of training in Higher Education (University) at all levels. This is intended to promote the development of practical strategies that allow overcoming the obstacles encountered by migrant women during the integration process, favoring the construction of institutions, administrations and, ultimately, more inclusive societies. The content presented in this book proposes recommendations and intervention proposals oriented to practice to: - Improve Higher Education study plans by promoting the training of students as future active protagonists who are aware of social interventions. This will promote equity, diversity and the integration of migrant women. - Strengthen cooperation and creation of networks between academic organizations, the third sector and public administrations that are responsible for promoting the integration and inclusion of migrant women. - Promote dialogue and the exchange of knowledge to, firstly, raise awareness of human mobility and gender in Europe and, secondly, promote the participation and social, labor and civic integration of the migrant population. All this is developed through 4 areas in which this book is articulated. The first area entitled "Migrant women needs and successful integration interventions"; the second area entitled "Promoting University students awareness and civic and social responsibility towards migrant women integration"; the third area entitled "Cooperation between Higher Education institutions and third sector"; the fourth and last area, entitled "Inclusive Higher Education".
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Jones, Natalie, Miquel Muñoz Cabré, Georgia Piggot e Michael Lazarus. Tapping the potential of NDCs and LT-LEDS to address fossil fuel production. Stockholm Environment Institute, giugno 2021. http://dx.doi.org/10.51414/sei2021.010.

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The need for a managed transition away from fossil fuel production raises the question of whether and how countries are addressing this need in their national communications to the UN Framework Convention on Climate Change (UNFCCC). A previous 2019 analysis of the first round of nationally determined contributions (NDCs) and long-term, low-emissions development strategies (LT-LEDS) found that few countries discussed how they would address fossil fuel production as part of their climate mitigation activities. Here, we examine new and updated NDCs and LT-LEDS, finding a growing number of NDCs and LT-LEDS that address fossil fuel production as part of mitigation. For the first time, several countries incorporate policies and/ or pathways for a managed decline of fossil fuel production. In contrast, many others foresee continued or expanded fossil fuel production, with no mention of efforts to prepare for a transition. Opportunities remain for countries to make better use of NDCs and LT-LEDS to align fossil fuel production with the Paris Agreement, including by more comprehensively reflecting on the equity implications of their plans, as well as addressing how countries plan to diversify their economies, ensure a just transition for workers, and cooperate internationally on a managed wind-down of fossil fuel supply. As COP26 approaches, this window of opportunity is still open, but it is rapidly closing.
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Kibler, Amanda, René Pyatt, Jason Greenberg Motamedi e Ozen Guven. Key Competencies in Linguistically and Culturally Sustaining Mentoring and Instruction for Clinically-based Grow-Your-Own Teacher Education Programs. Oregon State University, maggio 2021. http://dx.doi.org/10.5399/osu/1147.

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Grow-Your-Own (GYO) Teacher Education programs that aim to diversify and strengthen the teacher workforce must provide high-quality learning experiences that support the success and retention of Black, Indigenous, and people of color (BIPOC) teacher candidates and bilingual teacher candidates. Such work requires a holistic and systematic approach to conceptualizing instruction and mentoring that is both linguistically and culturally sustaining. To guide this work in the Master of Arts in Teaching in Clinically Based Elementary program at Oregon State University’s College of Education, we conducted a review of relevant literature and frameworks related to linguistically responsive and/or sustaining teaching or mentoring practices. We developed a set of ten mentoring competencies for school-based cooperating/clinical teachers and university supervisors. They are grouped into the domains of: Facilitating Linguistically and Culturally Sustaining Instruction, Engaging with Mentees, Recognizing and Interrupting Inequitable Practices and Policies, and Advocating for Equity. We also developed a set of twelve instructional competencies for teacher candidates as well as the university instructors who teach them. The instructional competencies are grouped into the domains of: Engaging in Self-reflection and Taking Action, Learning About Students and Re-visioning Instruction, Creating Community, and Facilitating Language and Literacy Development in Context. We are currently operationalizing these competencies to develop and conduct surveys and focus groups with various GYO stakeholders for the purposes of ongoing program evaluation and improvement, as well as further refinement of these competencies.
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Lunsgaarde, Erik, Kevin Adams, Kendra Dupuy, Adis Dzebo, Mikkel Funder, Adam Fejerskov, Zoha Shawoo e Jakob Skovgaard. The politics of climate finance coordination. Stockholm Environment Institute, ottobre 2021. http://dx.doi.org/10.51414/sei2021.022.

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As COP26 approaches, governments are facing calls to increase the ambition of their climate commitments under the Paris Agreement. The mobilization of climate finance will be key to meeting these goals, prompting the need for renewed attention on how to enhance the coordination of existing funds and thus increase their effectiveness, efficiency and equity. The climate finance landscape is fragmented due to the variety of actors involved at different levels. Coordination difficulties emerge in multiple arenas and reflect the diversity of funding sources, implementation channels, and sectors relevant for climate action (Lundsgaarde, Dupuy and Persson, 2018). The Organisation for Economic Cooperation and Development has identified over 90 climate-specific funds. Most of them are multilateral. While bilateral climate finance remains significant, growth in multilateral funding has been the main driver of recent funding increases and remains a focus of international negotiations. Practitioners often highlight organizational resource constraints – such as staffing levels, the continuity of personnel, or the availability of adequate information management systems – as factors limiting coordination. In this brief, we argue that improving climate finance coordination requires considering coordination challenges in a political context where both fund secretariats and external stakeholders play an important role in shaping collaboration prospects. To illustrate this point, we highlight the political nature of global-level coordination challenges between the multilateral Climate Investment Funds (CIF) and Green Climate Fund (GCF), as well as national-level challenges in Kenya and Zambia. Key challenges influencing coordination relate to the governance of climate funds, domestic bureaucratic politics in recipient countries, and the existence of multiple coordination frameworks at the country level.
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Melanie, Haupt, e Hellweg Stefanie. Synthesis of the NRP 70 joint project “Waste management to support the energy turnaround (wastEturn)”. Swiss National Science Foundation (SNSF), gennaio 2020. http://dx.doi.org/10.46446/publication_nrp70_nrp71.2020.2.en.

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A great deal of energy can be sourced both directly and indirectly from waste. For example, municipal waste with an energy content of around 60 petajoules is incinerated in Switzerland every year. The energy recovered directly from this waste covers around 4 % of the Swiss energy demand. However, the greatest potential offered by waste management lies in the recovery of secondary raw materials during the recycling process, thus indirectly avoiding the energy-intensive production of primary raw materials. In order to optimise the contribution to the energy turnaround made by waste management, as a first step, improvements need to be made with respect to the transparent documentation of material and cash flows, in particular. On the basis of this, prioritisation according to the energy efficiency of various recycling and disposal channels is required. Paper and cardboard as well as plastic have been identified as the waste fractions with the greatest potential for improvement. In the case of paper and cardboard, the large quantities involved result in considerable impact. With the exception of PET drinks bottles, plastic waste is often not separately collected and therefore offers substantial improvement potential. Significant optimisation potential has also been identified with regard to the energy efficiency of incineration plants. To allow municipal solid waste incineration (MSWI) plants to use the heat they generate more effectively, however, consumers of the recovered steam and heat need to be located close by. A decisive success factor when transitioning towards an energy-efficient waste management system will be the cooperation between the many stakeholders of the federally organised sector. On the one hand, the sector needs to be increasingly organised along the value chains. On the other hand, however, there is also a need to utilise the freedom that comes with federal diversity in order to test different solutions.
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Accelerating Digital Payments in Latin America and the Caribbean. Inter-American Development Bank, maggio 2022. http://dx.doi.org/10.18235/0004256.

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Between the first and second quarters of 2020, e-commerce website traffic from five of the regions major markets increased by over 150%. The COVID-19 pandemic has pushed and pulled tens of thousands of businesses in the region to go digital. The impact and advantages of such digitalization are quite telling for small and medium-sized enterprises (SMEs) in particular. SMEs in LAC can diversify their customer base and reach 20 foreign markets when operating online, while those that operate offline can only reach from two to five. As todays digital economy becomes the norm, universal basic services such as education and medical care are also taking place online. Digital payments are critical to enabling this transformation at both domestic and cross-border levels. But many challenges still exist that preclude the broadening of digital payment use throughout the region from a lack of access, regulatory harmonization and affordable payment solutions, to a need for further public and private sector cooperation, consumer protections and an open, inclusive and interoperable payment ecosystem. In 2021, the World Economic Forum and the innovation laboratory of the Inter-American Development Bank, IDB Lab, jointly launched the Payments to Advance Growth for All (PAGA) initiative to address these challenges. This initiative has convened a diverse community of over 100 public and private sector representatives to explore, through dialogue, how to best unlock the true benefits of digital payments in LAC. As digital payments continue to thrive and drive financial inclusion and economic growth, we hope this paper will provide a timely snapshot of the most pressing issues and highlight the importance of public-private and private-private cooperation to advance digital payments for all in an open, inclusive and safe manner. * The opinions expressed in this work are those of the authors and do not necessarily reflect the views of the IDB, its Board of Directors or the countries they represent, nor of the MIF (IDB Lab) Donors Committee or the countries it represents.
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