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Asymptotic characterization of link arrays in advanced-generation wireless systems

Grant number: 18/25009-4
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): April 01, 2019
Effective date (End): March 31, 2023
Field of knowledge:Engineering - Electrical Engineering - Telecommunications
Principal researcher:José Cândido Silveira Santos Filho
Grantee:Francisco Raimundo Albuquerque Parente
Home Institution: Faculdade de Engenharia Elétrica e de Computação (FEEC). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil

Abstract

In wireless communications systems, the channel between transmitter and receiver is subject to random fluctuations of amplitude and phase. This phenomenon is known as fading. In order to model the fading channel, statistical distributions such as Rayleigh, Rice, Hoyt, Nakagami-m, and Weibull have been widely used in the literature. However, in order to meet the growing demand for data services, it is necessary to employ a more versatile and realistic description of the wireless channel. In this way, the use of generalized fading distributions, such as α-μ, η-μ, κ-μ, is more appropriate. It is well known that the fading phenomenon impairs the performance of wireless systems, degrading paramount metrics like bit error rate and outage probability. These metrics appear in terms of a variety of combinations - sums, products, maxima, minima, harmonic averages, among others - of the wireless links that compose the system. This depends upon how the links are arranged as well as upon the communication protocol employed on each link. Nevertheless, the statistical analysis of such arrays is typically complicated, if not unfeasible. And that difficulty increases in advanced-generation systems, for which complex arrays of cooperative wireless links are envisioned, being cognitively and dynamically adjusted, with multiple routes from multiple relays connecting source to destination. In this research project, we intend to develop a general analytical framework to characterize the asymptotic behavior of different types of wireless link arrays that compose advanced-generation communication systems. The asymptotic characterization allows to overcome the inherent difficulties of the exact statistical treatment, while guaranteeing an excellent approximation for operational regimes of practical interest, from medium to high signal-to-noise ratio. The proposal encompasses generalized fading models as well as mutually correlated arrays, which is quite plausible in emerging technologies with massive use of multiple transmissions and receptions. In addition, based on the developed analytical characterization, we intend to elaborate optimal resource-allocation criteria for all link arrays investigated herein. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
ALMEIDA GARCIA, FERNANDO DARIO; ALBUQUERQUE PARENTE, FRANCISCO RAIMUNDO; FRAIDENRAICH, GUSTAVO; SILVEIRA SANTOS FILHO, JOSE CANDIDO. ight Exact Expressions for the Sum of Weibull Random Variable. IEEE WIRELESS COMMUNICATIONS LETTERS, v. 10, n. 11, p. 2445-2449, . (18/25009-4)

Please report errors in scientific publications list by writing to: cdi@fapesp.br.