Examinando por Autor "Escribano, Francisco J."

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A Spatial Time-Frequency Hopping Index Modulated Scheme in Turbulence-free Optical Wireless Communication Channels
(Institute of Electrical and Electronics Engineers, 2020-07-01) Escribano, Francisco J.; Wagemakers, Alexandre; Kaddoum, Georges; Evangelista, Joao V. C.
Chaos-Based Multicarrier VLC Modulator With Compensation of LED Nonlinearity
(2019-01-10) Escribano, Francisco J.; Sáez-Landete, José; Wagemakers, Alexandre
Chaos-Based Turbo Systems in Fading Channels
(IEEE, 2014-02-01) Escribano, Francisco J.; Wagemakers, Alexandre; Sanjuán, Miguel A. F.
Design ad Performance Analysis of an Index Time-Frequency Modulation Scheme for Optical Communications
(IEEE, 2019-10-01) Escribano, Francisco J.; Wagemakers, Alexandre; Kaddoum, Georges; Evangelista, Joao V. C.
In this article, we propose an index modulation system suitable for optical communications, based on jointly driving the time and frequency of the signal: an index-time frequency hopping (I-TFH) system. We analyze its performance from the point of view of its efficiency in power and spectrum, and its behavior in terms of error probability for the non- turbulent free-space optical (FSO) channel. We compare I-TFH with already proposed index modulated systems of the same nature, but where the amplitude or the number of transmitters are driven instead of the signal frequency.We derive and compare approximations for the average symbol and bit error probabilities of all these systems. The simulation results show that said approximations are tight enough for a wide range of signal-to- noise ratios and system parameters. Moreover, I-TFH shows to be better performing in BER and/or power efficiency than the comparative alternatives, and may offer interesting properties in a variety of contexts.
Design of a New Differential Chaos-Shift-Keying System for Continuous Mobility
(IEEE, 2016-05-02) Escribano, Francisco J.; Kaddoum, Georges; Wagemakers, Alexandre; Giard, Pascal
Optimisation of chaos‐based coded modulations for compensation of amplifier non‐linearities
(Electronic Letters, 2016-10-27) Escribano, Francisco J.; Sáez‐Landete, José; Wagemakers, Alexandre
The possibilities of a known class of chaos-based coded modulation (CCM) systems are expanded to address the problem of high-power amplifier (HPA) non-linearity. The hypothesis is that the CCM non-linear nature can be exploited to counteract its effects on the system perfomance, avoiding the need of a predistorter. An optimisation method for the design of the CCM to prove this hypothesis is proposed. The results show that, for a given back-off level, a non-linear mapping function for the chaos-based encoder and decoder can be designed to compensate the HPA effect on the error rate.
Performance Analysis of QAM-MPPM in Turbulence-Free FSO Channels: Accurate Derivations and Practical Approximations
(IEEE, 2021-06-01) Escribano, Francisco J.; Wagemakers, Alexandre