Co-channel interference and background noise in κ - μ fading channels

In this letter, we derive novel analytical and closed form expressions for the outage probability, when the signal-of- interest (SoI) and the interferer experience kappa-mu fading in the presence of Gaussian noise. Most importantly, these expressions hold true for independent and non-identically distributed kappa-mu variates, without parameter constraints. We also find the asymptotic behaviour when the average signal to noise ratio of the SoI is significantly larger than that of the interferer. It is worth highlighting that our new solutions are very general owing to the flexibility of the kappa-mu fading model21512151218CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ304248/2014-2This work was supported by the U.K. Engineering and Physical Sciences Research Council under Grant Reference EP/L026074/1 and by CNPq under Grant Reference 304248/2014-2

The complex α-μ fading channel with OFDM application

The aims of this paper are threefold: (i) to present a model for the complex - fading channel; (ii) to propose an efficient, simple, and general method to generate complex - samples; (iii) to make use of this channel in order to assess the bit error rate performance of an OFDM system. An analytical framework is then used, whose output is validated through Monte Carlo simulation. Several important conclusions concerning the system performance as a function of the channel parameters, namely, nonlinearity, clustering, and power imbalance of in-phase and quadrature components, are drawn2017Recent advances in RF propagation modeling for 5G systemsFINANCIADORA DE ESTUDOS E PROJETOS - FINEP01.14.0231.0

Fading Evaluation in the mm-Wave Band

[EN] A thorough millimeter-wave measurement campaign is carried out in an indoor environment with an aim at characterizing the short-term fading channel behavior. The measurements are conducted in a variety of scenarios, with frequencies ranging from 55 GHz to 65 GHz, in line-of-sight and non-line-of-sight conditions, and combinations of horizontal and vertical polarizations at both transmitter and receiver. A number of fading models are tested, namely Rayleigh, Rice, Nakagami-m, alpha-mu, kappa-mu, eta-mu, and alpha-eta-kappa-mu. The statistics under analysis are those characterizing the fading amplitude and the frequency selectivity. In particular, the probability density and cumulative distribution functions for the former and level crossing rate per bandwidth unit for the latter are the respective first-and second-order statistics used. To this end, from the experimental data, the parameters of the models are estimated and the corresponding theoretical curves are plotted and compared with the empirical ones. Whereas the required theoretical formulations of the first-order statistics of these models are already well known, those of the second-order statistics as well as these fitting process in such a band shown here are unprecedented in the literature.This work was supported in part by CNPq under Grant 304248/2014-2 and Grant 308365/2017-8 and in part by RNP, with resources from MCTIC, Grant No. No 01250.075413/2018-04, under the Radiocommunication Reference Center (Centro de Referencia em Radiocomunicacoes -CRR) project of the National Institute of Telecommunications (Instituto Nacional de Telecomunicacoes -Inatel), Brazil, and by the Ministerio de Economia, Industria y Competitividad of the Spanish Government under the national project TEC2017-86779-C2-2-R, through the Agencia Estatal de Investigacion (AEI) and the Fondo Europeo de Desarrollo Regional (FEDER). The associate editor coordinating the review of this article and approving it for publication was T. Kim.Rufino Marins, TR.; Dos Anjos, AA.; Rodrigo Peñarrocha, VM.; Rubio Arjona, L.; Reig, J.; Amaral De Souza, RA.; Yacoub, MD. (2019). Fading Evaluation in the mm-Wave Band. IEEE Transactions on Communications. 67(12):8725-8738. https://doi.org/10.1109/TCOMM.2019.2941493S87258738671

η-μ Distribution: A General Fading Distribution

This paper presents a general fading distribution - the ν-μ Distribution - that includes the One-Sided Gaussian, the Rayleigh, and, more generally, the Nakagami distributions as special cases. Rice and Lognormal distributions may also be well-approximated by the ν-μ Distribution. Preliminary results show that the ν-μ Distribution provides a very good fitting to experimental data.252 ND872877Braun, W.R., Dersch, U., A physical mobile radio channel model (1991) IEEE Trans. Veh. Technol., 40 (2), pp. 472-482. , MayTurin, G.L., Introduction to spread-spectrum antimultipath techniques and their application to urban digital radio (1980) Proc. IEEE, 68 (3), pp. 328-353. , MarchSuzuki, H., A statistical model for urban radio propagation (1977) IEEE Trans. Commun., COM-25 (7), pp. 673-679. , JulyParsons, J.D., (1992) The Mobile Radio Channel, , New York: Halsted PressStein, S., Fading channel issues in system engineering (1987) IEEE J. Selected Areas in Commun., 5 (2), pp. 68-69. , FebAbramowitz, M., Stegun, I.A., (1972) Hanbook of Mathematical Functions, , US Dept. of Commerce, National Bureau of Standards, Applied Mathematics SeriesNakagami, M., (1960) The M-distribution-A General Formula of Intensity Distribution of Rapid Fading, in Statistical Methods in Radio Wave Propagation, , W. C. Hoffman, Ed. Elmsford, NY: PergamonYacoub, M.D., Vargas B, J.E., De Guedes, L.G.R., On higher order statistics of the Nakagami-m distribution (1999) IEEE Trans. Veh. Technol., 48 (3), pp. 790-794. , Ma

The Alpha-eta-kappa-mu Fading Model

A fading model-the alpha-eta-kappa-mu model-is proposed that accounts for virtually all relevant short-term propagation phenomena described in the literature. These phenomena include nonlinearity of the medium, power of the scattered waves, power of the dominant components, and number of multipath clusters. They are mapped onto physical parameters, and apart from the first one, which is assumed to influence only the resulting signal envelope, the others affect independently its in-phase and quadrature components. Imbalance parameters are then introduced so as to better assess the impact of these phenomena on the entire process. The signal is described by means of its envelope and phase probability density functions (pdfs). To this end, complex-based and envelope-based models are proposed and explored. An exact joint envelope-phase pdf is found in the closed form. The marginal statistics in these cases remain in the integral forms. Interestingly, the envelope density function obtained through the envelope-based model is found to compute more efficiently than that obtained through the complex model. In addition, capitalizing on the results in the literature, exact series-expansion formulations are found for the envelope pdf as well as for the envelope cumulative distribution function. To the best of the author's knowledge, this is probably the most general and unifying, physically based, complex fading model proposed in the literature. Because of its comprehensiveness, a number of issues remain open and constitute a fertile field for investigation.64835973610National Council for Scientific and Technological Development [304248/2014-2

Matriz de comutação de uma CPA-temporal

Orientador: Hermano de M. F. TavaresDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia de CampinasResumo: O Centro de Pesquisa e Desenvolvimento - CPqD - da TELEBRAS através do seu Departamento de Comutação - DCO - vem, desde a sua criação, concentrando esforços com intuito de desenvolver os elementos de uma família de Central por Programa Armazenado - CPA - Temporal brasileira; o Sistema TRÓPICO. Neste trabalho apresenta-se o projeto da matriz de comutação de tal sistema levando-se em conta o "hardware" e "software" de controle envolvidos. O pequeno número de placas diferentes, englobando funções variadas no tratamento de um grande número de enlaces, e sua modularidade, dando uma flexibilidade de adaptação as mais varia- das demandas de trafego, são as principais características da matriz. Tais características propiciam um controle e uma manutenção bastante simples além do custo industrial competir com o dos equipamentos produzidos no exteriorAbstract: The Switching Department (DCO) of the Research and Development Center (CPqD) of TELEBRAS has, since its creation, concentrated its efforts on the development of a Brasilian family of Time Division Stored Program Control (TDSPC) telephone exchanges, the TROPICO System. The work presented here concerns the design of the switching matrix of this system, including both the hardware, and the control software aspects of the designs. The small number of different circuit boards, covering the various functions necessary for the handling of a large number of links, and the modularity of the structure permitting the flexibility for accomodating the widest variations in traffic patterns, are the principal characteristics of the switching matrix, These characteristics also allow for relatively simple control and maintenance, not to mention a production cost competitive with equipment produced abroadMestradoMestre em Engenharia Elétric