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Your search keyword '"Lopez-Lopez, L. (Lizeth)"' showing total 2 results
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2 results on '"Lopez-Lopez, L. (Lizeth)"'

1. Spectrum challenges for beyond 5G:the case of Mexico

Author

Lopez-Lopez, L. (Lizeth), Matinmikko-Blue, M. (Marja), Cardenas-Juarez, M. (Marco), Stevens-Navarro, E. (Enrique), Aguilar-Gonzalez, R. (Rafael), and Katz, M. (Marcos)

Subjects
spectrum regulation, spectrum measurements, spectrum challenges, beyond 5G
Abstract

In recent years, there has been an increasing interest in satisfying the spectrum demand for communications beyond 5G (B5G) at a global level. However, in such a large and diverse country as Mexico, the implementation of B5G wireless networks towards 6G will require new spectrum regulation policies that also take into account the particular aspects of the country, such as population density, geographic diversity, as well as social and economic issues. This paper discusses the asymmetries of the urban and rural scenarios of mobile communications and examines their relationship to the current status of the spectrum for 5G mobile communications in Mexico. Then, it explores the spectrum-related challenges that must be overcome to attain ambitious goals beyond 5G technologies. Thus showing the necessity of novel spectrum allocation mechanisms that consider the myriad of scenarios and their different demands in similar countries, in order to satisfy the requirements of B5G wireless communications and networks.

Published
2020

2. On the leverage of superimposed training for energy-efficient spectrum sensing in cognitive radio

Author

Lopez-Lopez, L. (Lizeth), Cardenas-Juarez, M. (Marco), Stevens-Navarro, E. (Enrique), Aldalahmeh, S. A. (Sami A.), Katz, M. (Marcos), Lopez-Lopez, L. (Lizeth), Cardenas-Juarez, M. (Marco), Stevens-Navarro, E. (Enrique), Aldalahmeh, S. A. (Sami A.), and Katz, M. (Marcos)

Abstract

The efficient utilization of the radio-electric spectrum (or simply spectrum) is essential to satisfy the ever- increasing amount of bandwidth required by future wireless communications networks. Cognitive radio (CR) networks aim to improve this efficiency by dynamically exploiting the underutilized spectrum (also called spectrum opportunities). To identify these transmission opportunities, cognitive users might draw on spectrum sensing, although this task increases the energy consumption. For battery-powered terminals, this increment might represent a challenge, also considering that spectrum sensing must be recurrently performed. For a scenario in which the CR user first senses the spectrum and then, if allowed, transmit data, the average energy consumption depends on the time used for spectrum sensing and for data transmission, which also impacts the spectrum-efficiency. Thus, improving the energy-efficiency might implicate a reduction on the spectrum-efficiency. This paper analyses the energy-efficiency in the context of spectrum sensing of superimposed training-based transmissions, showing the advantages of using an enhanced spectrum sensing method in terms of the relationship between the spectrum and energy- efficiency.

Published
2020

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