The Experts below are selected from a list of 31836 Experts worldwide ranked by ideXlab platform
Daniela Tuninetti - One of the best experts on this subject based on the ideXlab platform.
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The capacity of the Gaussian cooperative two-user multiple access channel to within a constant gap
2013 IEEE International Conference on Communications (ICC), 2013Co-Authors: Daniela TuninettiAbstract:The capacity region of the cooperative two-user Multiple Access Channel (MAC) in Gaussian noise is determined to within a constant gap for both the Full-Duplex (FD) and Half-Duplex (HD) case. The main contributions are: (a) for both FD and HD: unilateral cooperation suffices to achieve capacity to within a constant gap where only the user with the Strongest Link to the destination needs to engage in cooperation, (b) for both FD and HD: joint backward decoding is not necessary to achieve capacity to within a constant gap, and (c) for HD: time sharing between the case where the two users do not cooperate and the case where the user with the Strongest Link to the destination acts as pure relay for the other user suffices to achieve capacity to within a constant gap. These findings show that simple achievable strategies are approximately optimal for all channel parameters with interesting implications for practical cooperative schemes.
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ICC - The capacity of the Gaussian cooperative two-user multiple access channel to within a constant gap
2013 IEEE International Conference on Communications (ICC), 2013Co-Authors: Daniela TuninettiAbstract:The capacity region of the cooperative two-user Multiple Access Channel (MAC) in Gaussian noise is determined to within a constant gap for both the Full-Duplex (FD) and Half-Duplex (HD) case. The main contributions are: (a) for both FD and HD: unilateral cooperation suffices to achieve capacity to within a constant gap where only the user with the Strongest Link to the destination needs to engage in cooperation, (b) for both FD and HD: joint backward decoding is not necessary to achieve capacity to within a constant gap, and (c) for HD: time sharing between the case where the two users do not cooperate and the case where the user with the Strongest Link to the destination acts as pure relay for the other user suffices to achieve capacity to within a constant gap. These findings show that simple achievable strategies are approximately optimal for all channel parameters with interesting implications for practical cooperative schemes.
Mehmoon Anwar - One of the best experts on this subject based on the ideXlab platform.
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Simultaneous Wireless Information and Power Transfer for Buffer-Aided Cooperative Relaying Systems
2018 14th International Wireless Communications & Mobile Computing Conference (IWCMC), 2018Co-Authors: Hina Nasir, Nadeem Javaid, Muhammad Shoaib, Muhammad Imran, Mehmoon AnwarAbstract:This paper explored cooperative relaying in the presence of energy constrained relays with data storage facility. The relays depend only on the source signal to harvest energy and forward signal to the destination. The relay is selected according to the instantaneous strength of the wireless Link. The Strongest Link among all Links on both sides i.e., source-relay and relaydestination Links is selected for relay to receive or transmit data, respectively. Two protocols are used for energy harvesting and information transfer namely: ”power splitting based relaying” and ”time switching based relaying”. We evaluate the outage probability performance of the presented scheme using Monte Carlo simulations. The results show that TSR performs better than PSR protocol.
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IWCMC - Simultaneous Wireless Information and Power Transfer for Buffer-Aided Cooperative Relaying Systems
2018 14th International Wireless Communications & Mobile Computing Conference (IWCMC), 2018Co-Authors: Hina Nasir, Nadeem Javaid, Muhammad Shoaib, Muhammad Imran, Mehmoon AnwarAbstract:This paper explored cooperative relaying in the presence of energy constrained relays with data storage facility. The relays depend only on the source signal to harvest energy and forward signal to the destination. The relay is selected according to the instantaneous strength of the wireless Link. The Strongest Link among all Links on both sides i.e., source-relay and relaydestination Links is selected for relay to receive or transmit data, respectively. Two protocols are used for energy harvesting and information transfer namely: ”power splitting based relaying” and ”time switching based relaying”. We evaluate the outage probability performance of the presented scheme using Monte Carlo simulations. The results show that TSR performs better than PSR protocol.
Umesh Vaidya - One of the best experts on this subject based on the ideXlab platform.
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CDC-ECE - Robust synchronization in nonlinear network with Link failure uncertainty
IEEE Conference on Decision and Control and European Control Conference, 2011Co-Authors: Amit Diwadkar, Umesh VaidyaAbstract:The problem of synchronization of systems over a network, is a widely studied problem given the importance of synchronization phenomena, in various natural science and engineering applications. In this paper, we study one of the important aspect of this problem that is, robustness of synchronization to random Link failure uncertainty. The Link failure uncertainty is modeled as an on-off Bernoulli switch. The main results of this paper provide, for the first time, analytical conditions for the maximum tolerable Link failure uncertainty to maintain mean square synchronization among the network components. The analytical conditions are expressed in terms of individual component dynamics, network properties, and Link uncertainty. The main results of this paper can be used to determine, the weakest/Strongest Link in the network. Simulation results are provided to verify the main results of this paper.
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Robust synchronization in nonlinear network with Link failure uncertainty
2011 50th IEEE Conference on Decision and Control and European Control Conference, 2011Co-Authors: Amit Diwadkar, Umesh VaidyaAbstract:The problem of synchronization of systems over a network, is a widely studied problem given the importance of synchronization phenomena, in various natural science and engineering applications. In this paper, we study one of the important aspect of this problem that is, robustness of synchronization to random Link failure uncertainty. The Link failure uncertainty is modeled as an on-off Bernoulli switch. The main results of this paper provide, for the first time, analytical conditions for the maximum tolerable Link failure uncertainty to maintain mean square synchronization among the network components. The analytical conditions are expressed in terms of individual component dynamics, network properties, and Link uncertainty. The main results of this paper can be used to determine, the weakest/Strongest Link in the network. Simulation results are provided to verify the main results of this paper.
Iain B. Collings - One of the best experts on this subject based on the ideXlab platform.
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SER of Multiple Amplify-and-Forward Relays with Selection Diversity
IEEE Transactions on Communications, 2011Co-Authors: Phee Lep Yeoh, Maged Elkashlan, Zhuo Chen, Iain B. CollingsAbstract:In wireless mesh networks, it is desirable to utilize overlapping coverage of multiple parallel relays to assist the source-destination transmission. In this letter, we consider selection diversity (SD) to select the Strongest Link amongst the direct and N amplify-and-forward (AF) relay Links. We derive new closed-form expressions for the symbol error rate (SER) in independent but not necessarily identically distributed (i.n.d.) Rayleigh fading relay channels. Our results are given as both lower bound and asymptotic expressions based on an accurate upper bound on the signal-to-noise ratio (SNR) of the relay Links. Our asymptotic results provide key performance parameters such as the array gain and diversity order, which prove that a full N+1 diversity order is achieved. We show that SD can offer an array gain advantage over maximal-ratio combining which entails all the relays to transmit. Numerical results are shown to validate the analysis.
Ozdecan Bezirci - One of the best experts on this subject based on the ideXlab platform.
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establishment of interdisciplinary child protection teams in turkey 2002 2006 identifying the Strongest Link can make a difference
Child Abuse & Neglect, 2009Co-Authors: Canan A Agirtan, Taner Akar, Seher Akbas, Recep Akdur, Cahide Aydin, Gulsen Aytar, Suat H Ayyildiz, Sevgi Baskan, Tugba Belgemen, Ozdecan BezirciAbstract:Abstract Objectives The University of Iowa Child Protection Program collaborated with Turkish professionals to develop a training program on child abuse and neglect during 2002–2006 with the goals of increasing professional awareness and number of multidisciplinary teams (MDT), regional collaborations, and assessed cases. This paper summarizes the 5-year outcome. Methods A team of instructors evaluated needs and held training activities in Turkey annually, and provided consultation when needed. Descriptive analysis was done via Excel and SPSS software. Results Eighteen training activities were held with 3,570 attendees. Over the study period, the number of MDTs increased from 4 to 14. The MDTs got involved in organizing training activities in their institutions and communities. The number of medical curriculum lectures taught by MDTs to medical students/residents, conferences organized by the MDTs, and lectures to non-medical professional audiences increased significantly ( R 2 = 91.4%, 83.8%, and 69.2%, respectively). The number of abuse cases assessed by the MDTs increased by five times compared to pre-training period. Conclusions A culturally competent training program had a positive impact on professional attitudes and behaviors toward recognition and management of child abuse and neglect in Turkey. The need to partner with policy makers to revise current law in favor of a greater human services orientation became clear. Practice implications Pioneers in developing countries may benefit from collaborating with culturally competent instructors from countries with more developed child protection systems to develop training programs so that professional development can improve recognition and management of child abuse and neglect.
