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Heterogeneous integration of optical wireless communications within next generation networks


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Abstract

Unprecedented traffic growth is expected in future wireless networks and newtechnologies will be needed to satisfy demand. Optical wireless OW communication offers vast unused spectrum and high area spectral efficiency. In this work, opticalcells are envisioned as supplementary access points within heterogeneous RF-OW networks. These networks opportunistically offload traffic to optical cells while utilizingthe RF cell for highly mobile devices and devices that lack a reliable OW connection.Visible light communication VLC is considered as a potential OW technology dueto the increasing adoption of solid state lighting for indoor illumination.Results of this work focus on a full system view of RF-OW HetNets with three primary areas of analysis. First, the need for network densication beyond current RFsmall cell implementations is evaluated. A media independent model is developedand results are presented that provide motivation for the adoption of hyper densesmall cells as complementary components within multi-tier networks. Next, the relationships between RF and OW constraints and link characterization parameters areevaluated in order to define methods for fair comparison when user-centric channelselection criteria are used. RF and OW noise and interference characterization techniques are compared and common OW characterization models are demonstratedto show errors in excess of 100x when dominant interferers are present. Finally,dynamic characteristics of hyper dense OW networks are investigated in order to optimize traffic distribution from a network-centric perspective. A Kalman Filter modelis presented to predict device motion for improved channel selection and a novel OWrange expansion technique is presented that dynamically alters coverage regions ofOW cells by 50%.In addition to analytical results, the dissertation describes two tools that havebeen created for evaluation of RF-OW HetNets. A communication and lightingsimulation toolkit has been developed for modeling and evaluation of environmentswith VLC-enabled luminaires. The toolkit enhances an iterative site based impulseresponse simulator model to utilize GPU acceleration and achieves 10x speedup overthe previous model. A software defined testbed for OW has also been proposedand applied. The testbed implements a VLC link and a heterogeneous RF-VLCconnection that demonstrates the RF-OW HetNet concept as proof of concept.

Boston University Theses and Dissertations -



Author: Rahaim, Michael - -

Source: https://open.bu.edu/







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