Browsing by Author "Cotton, Simon L."

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    Indoor Millimeter-Wave Systems: Design and Performance Evaluation
    Kibilda, Jacek; MacKenzie, Allen B.; Abdel-Rahman, Mohammad J.; Yoo, Seong Ki; Giordano, Lorenzo Galati; Cotton, Simon L.; Marchetti, Nicola; Saad, Walid; Scanlon, William G.; Garcia-Rodriguez, Adrian; Lopez-Perez, David; Claussen, Holger; DaSilva, Luiz A. (IEEE, 2020-06-01)
    Indoor areas, such as offices and shopping malls, are a natural environment for initial millimeter-wave (mmWave) deployments. Although we already have the technology that enables us to realize indoor mmWave deployments, there are many remaining challenges associated with system-level design and planning for such. The objective of this article is to bring together multiple strands of research to provide a comprehensive and integrated framework for the design and performance evaluation of indoor mmWave systems. This article introduces the framework with a status update on mmWave technology, including ongoing fifth generation (5G) wireless standardization efforts and then moves on to experimentally validated channel models that inform performance evaluation and deployment planning. Together these yield insights on indoor mmWave deployment strategies and system configurations, from feasible deployment densities to beam management strategies and necessary capacity extensions.
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    A Stochastic Geometric Analysis of Device-to-Device Communications Operating Over Generalized Fading Channels
    Chun, Young Jin; Cotton, Simon L.; Dhillon, Harpreet Singh; Ghrayeb, Ali; Hasna, Mazen O. (2017-07)
    Device-to-device (D2D) communications are now considered an integral part of future 5G networks, which will enable direct communication between user equipments and achieve higher throughputs than conventional cellular networks, but with the increased potential for co-channel interference. The physical channels, which constitute D2D communications, can be expected to be complex in nature, experiencing both line-of-sight (LOS) and non-LOS conditions across closely located D2D pairs. In addition to this, given the diverse range of operating environments, they may also be subject to clustering of the scattered multipath contribution i.e., propagation characteristics which are quite dissimilar to conventional Rayleigh fading environments. To address these challenges, we consider two recently proposed generalized fading models, namely kappa-mu and eta-mu, to characterize the fading behavior in D2D communications. Together, these models encompass many of the most widely utilized fading models in the literature such as Rayleigh, Rice (Nakagami-n), Nakagami-m, Hoyt (Nakagami-q), and One-sided Gaussian. Using stochastic geometry, we evaluate the spectral efficiency and outage probability of D2D networks under generalized fading conditions and present new insights into the tradeoffs between the reliability, rate, and mode selection. Through numerical evaluations, we also investigate the performance gains of D2D networks and demonstrate their superiority over traditional cellular networks.