Listar por autor "López-Martínez, Francisco Javier"
Mostrando ítems 1-20 de 37
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A closed‐form expression for the coverage of cellular systems under Hoyt (Nakagami-q) fading.
Martín-Vega, Francisco-Javier; Gómez-Paredes, Gerardo
; López-Martínez, Francisco Javier; Aguayo-Torres, María del Carmen (Wiley, 2017)
A simple closed-form expression is provided for the coverage probability of cellular systems under Hoyt (Nakagami-q) fading, which models fading scenarios more severe than Rayleigh. The accuracy of the proposed framework ... -
A MATLAB program for the computation of the confluent hypergeometric function Φ2
Martos-Naya, Eduardo; Romero-Jerez, Juan Manuel; López-Martínez, Francisco Javier; París-Ángel, José Francisco (2016-09-22)
We here present a sample MATLAB program for the numerical evaluation of the confluent hypergeometric function Φ2. This program is based on the calculation of the inverse Laplace transform using the algorithm suggested by ... -
A New Framework for the Performance Analysis of Wireless Communications under Hoyt (Nakagami-q) Fading
Romero-Jerez, Juan Manuel; López-Martínez, Francisco Javier (IEEE, 2017)
We present a novel relationship between the distribution of circular and non-circular complex Gaussian random variables. Specifically, we show that the distribution of the squared norm of a non-circular complex Gaussian ... -
A Tractable Product Channel Model for Line-of-Sight Scenarios.
Fernández-Plazaola, Unai; Moreno-Pozas, Laureano; López-Martínez, Francisco Javier; París-Ángel, José Francisco; Martos-Naya, Eduardo; Romero-Jerez, Juan Manuel[et al.] (IEEE, 2020-01-06)
We present a general and tractable fading model for line-of-sight (LOS) scenarios, which is based on the product of two independent and non-identically distributed κ-μ shadowed power envelopes. Simple closed-form expressions ... -
An educational tool for understanding MPEG‐2 video compression and coding techniques
The understanding of the video encoding/decoding processes is a key skill for students of computer science, engineering, or telecommunications, especially those specialized in multimedia. The special characteristics of the ... -
An Extension of the κ -μ Shadowed Fading Model: Statistical Characterization and Applications.
Ramírez Espinosa, Pablo; López-Martínez, Francisco Javier; París-Ángel, José Francisco; Yacoub, Michel Daoud; Martos-Naya, Eduardo (IEEE, 2017-12-25)
We here introduce an extension and natural generalization of both the κ-μ shadowed and the classical Beckmann fading models: the Fluctuating Beckmann (FB) fading model. This new model considers the clustering of multipath ... -
Analysis of energy detection of unknown signals under Beckmann fading channels
The Beckmann fading is a general multipath fading model which includes Rice, Hoyt and Rayleigh fading as particular cases. However, the generality of the Beckmann fading also implies a significant increased mathematical ... -
Arquitectura HW para decodificador Two-Step SOVA con recorridos hacia atrás sistólicos
Martín-Vega, Francisco-Javier; López-Martínez, Francisco Javier; Entrambasaguas-Muñoz, José Tomás (2012-09-12)
In this paper, a novel SOVA (Soft-Output Viterbi algorithm) decoder using systolic arrays to carry out the trace-back method is presented. Systolic arrays are associated with high data rates and small resource requirements, ... -
Asymptotically Exact Approximations for the Symmetric Difference of Generalized Marcum-Q Functions
López-Martínez, Francisco Javier; Romero-Jerez, Juan Manuel; López-Martínez, Francisco Javier (IEEE, 2015)
In this paper, we derive two simple and asymptotically exact approximations for the function defined as ΔQm(a, b) =Δ Qm(a, b) - Qm(b, a). The generalized Marcum Q-function Qm(a, b) appears in many scenarios in communications ... -
Backing off from rayleigh and rice: Achieving perfect secrecy in wireless fading channels
(Escuela Técnica Superior de Ingeniería de Telecomunicación de la UMA, 2020-09)We show that for a legitimate communication under multipath quasi-static fading with a reduced number of scatter- ers, it is possible to achieve perfect secrecy even in the presence of a passive eavesdropper for which no ... -
Capacity Limits of Spectrum-Sharing in Hoyt (Nakagami-q) Fading Channels
Romero-Jerez, Juan Manuel; López-Martínez, Francisco Javier (2016-10-06)
A channel capacity analysis is presented in this work for a spectrum-sharing cognitive radio link in which the fading experienced by the signal is modeled with the Hoyt (Nakagami-q) distribution. Based on a novel formulation ... -
Comments on “Human Body Shadowing in Cellular Device-to-Device Communications: Channel Modeling Using the Shadowed κ−μ Fading Model”
Moreno-Pozas, Laureano; López-Martínez, Francisco Javier; Cotton, Simon L.; París-Ángel, José Francisco; Martos-Naya, Eduardo (Institute of Electrical and Electronics Engineers, 2017-02)
We provide some comments and subsequent corrections to a paper recently published in this Journal (see ibid., vol. 33, no. 1, pp. 111-119, Jan. 2015). More precisely, we show that the pdf for the κ-μ shadowed fading model ... -
Composite Fading Models Based on Inverse Gamma Shadowing: Theory and Validation.
(IEEE, 2021-03-17)We introduce a general approach to characterize composite fading models based on inverse gamma (IG) shadowing. We first determine to what extent the IG distribution is an adequate choice for modeling shadow fading, by ... -
Generalized MGF of Beckmann Fading with Applications to Wireless Communications Performance Analysis
Peña-Martín, Juan Pedro; Romero-Jerez, Juan Manuel; López-Martínez, Francisco Javier (IEEE Transaction on Communications, 2017)
The Beckmann distribution is a general multipath fading model for the received radio signal in the presence of a large number of scatterers, which can thence be modeled as a complex Gaussian random variable where both the ... -
Inversión aproximada de matrices en sistemas Massive MIMO correlados en tiempo o frecuencia
Cobos Morales, Óscar; Soldado Guerrero, Rafael; Martos-Naya, Eduardo; López-Martínez, Francisco Javier; Entrambasaguas-Muñoz, José Tomás (2018-09-20)
Massive multiple-input multiple-output (MIMO) is expected to be one of the keys in 5G. In this technology, the base station is equipped with a big number of antennas serving multiple users simultaneously to improve spectral ... -
Joint Parameter Estimation for the Two-Wave with Diffuse Power Fading Model.
López-Fernández, Jesús Manuel; Moreno-Pozas, Laureano; López-Martínez, Francisco Javier; Martos-Naya, Eduardo (MDPI, 2016-06-30)
Wireless sensor networks deployed within metallic cavities are known to suffer from a very severe fading, even in strong line-of-sight propagation conditions. This behavior is well-captured by the Two-Wave with Diffuse ... -
Low-Complexity Distance-Based Scheduling for Multi-User XL-MIMO Systems.
(IEEE, 2021-08-02)We introduce Distance-Based Scheduling (DBS), a new technique for user selection in downlink multi-user communications with extra-large (XL) antenna arrays. DBS categorizes users according to their equivalent distance ... -
Novel Results for the κ–μ Extreme Fading Distribution: Generation of White Samples and Capacity Analysis
López-Martínez, Francisco Javier; Moreno-Pozas, Laureano; Martos-Naya, Eduardo (IEEE Communications Letters, 2015-09)
We provide new analytical results for the κ-μ extreme (κ-μ-E) fading distribution, which is useful to model propagation conditions more severe than Rayleigh fading. First, we calculate a closed-form expression for the ... -
On the Calculation of the Incomplete MGF with Applications to Wireless Communications
López-Martínez, Francisco Javier; Romero-Jerez, Juan Manuel; París-Ángel, José Francisco (IEEE, 2017)
The incomplete moment generating function (IMGF) has paramount relevance in communication theory, since it appears in a plethora of scenarios when analyzing the performance of communication systems. We here present a general ... -
On the connection between noncircularly-symmetric and noncentral fading models: univariate and multivariate analysis
Moreno-Pozas, Laureano (UMA Editorial, 2017-06-01)
This thesis provides new statistical connections between noncircularly-symmetric central and circularly-symmetric noncentral underlying complex Gaussian models. This is particularly interesting since it facilitates the ...