Browsing by Author "Meza, Cesar A. Azurdia"
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- NB-IoT path loss experimental measurements in urban outdoor environmentsPublication . Moreno, Martín; Oxman, Daniela; Sandoval, Jorge; Meza, Cesar A. Azurdia; Gutiérrez Gaitán, Miguel; Játiva, Pablo Palacios; Firoozabad, Ali DehghanThis paper presents a performance analysis of the Narrowband Internet of Things (NB-IoT) network coverage in urban outdoor environments, focusing on experimental measurements toward path loss modeling. Conducted in a major Latin American city, the study explores the deployment of NB-IoT in LTE guardband 28 (700 MHz), offering valuable information on the network characteristics and coverage performance within this narrow spectrum. Four path loss models are considered, including comparisons between alpha-beta-gamma (ABG) and close-in (CI) empirical models. The end goal is to provide practical tools to optimize the deployment of the NB-IoT network in various urban environments. The results obtained offer a fresh perspective on the importance of experimental validation to accurately predict NB-IoT network coverage and signal quality in a real-world setting. Notably, the work has been carried out in collaboration with a Chilean telecom operator.
- On the path loss performance of underwater visible light communication schemes evaluated in several water environmentsPublication . Almonacid, Lucas; Játiva, Pablo Palacios; Meza, Cesar A. Azurdia; Dujovne, Diego; Soto, Ismael; Firoozabadi, Ali Dehghan; Gutiérrez Gaitán, MiguelThis paper presents an in-depth study into the necessity of efficient communication systems in underwater environments, with a primary focus on Underwater Visible Light Communication (UVLC). A novel path loss model that adapts to different water types is proposed to improve existing UVLC channel models. Validation against various scenarios, including different water types and receiver aperture diameters, is carried out using Monte Carlo simulations. The results demonstrate the efficiency and accuracy of the model by carefully fitting the actual performance of the UVLC systems. The results show a considerable improvement over previous models that only considered Lambert’s path loss and geometric path loss. Despite some variations observed at larger distances between the transmitter and receiver, the proposed model exhibits significant promise in the understanding and application of UVLC in different underwater environments. This study serves as a preliminary step toward developing more sophisticated and efficient models for UVLC systems.