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Listar por autor "Vallejo Castro, Luis"

Mostrando ítems 1-19 de 19

64-QAM LTE signal transmission at 25 GHz over hybrid SSMF and non-uniform turbulent FSO channel

Vallejo-Castro, Luis; Ortega Tamarit, Beatriz; Nguyen, Dong-Nhat; Bohata, Jan; Zvanovec, Stanislav (IEEE, 2020-11-25)

[EN] This contribution describes the impact of non uniform thermal-induced turbulence on 64-QAM LTE signal transmission at 25 GHz millimeter wave (mmW) signal along hybrid RoF/RoFSO links. Microwave photonic signal generation ...
Antenna Phased Array Beamforming at 26 GHz Using Optical True Time-Delay

Bohata, Jan; Lonský, Tomás; Spácil, Jan; Hazdra, Pavel; Hradecký, Zdenek; Komanec, Matej; Zvanovec, Stanislav; Vallejo-Castro, Luis; Ortega Tamarit, Beatriz (IEEE, 2020-07-22)

[EN] Multi-element antenna beam steering in free-licence higher frequency bands is one of the crucial features of 5G networks enabling better tracking of the users. In this paper, we present an experimental microwave ...
Comparison of carrier suppressed and quadrature bias point external modulation for 40 GHz millimeter-wave photonic generation using a 16-QAM signal with directly modulated laser

Vallejo-Castro, Luis; Ortega Tamarit, Beatriz; Nguyen, Dong-Nhat; Bohata, Jan; Zvanovec, Stanislav; Almenar Terre, Vicenç (IEEE, 2020-07-22)

[EN] A directly modulated laser usage is proposed for 16-QAM signal transmission over hybrid optical links using two optical frequency multiplication schemes based on external modulation for 40 GHz millimeter-wave (mmW) ...
Demonstration of M-QAM OFDM bidirectional 60/25 GHz transmission over 10 km Fiber, 100 m FSO and 2 m radio seamless heterogeneous fronthaul link

Vallejo, Luis; Ortega Tamarit, Beatriz; Mora Almerich, José; Nguyen, D.-N.; Guerra, C.; Bohata, J.; Spacil, J.; Zvanovec, S. (Elsevier, 2023-05)

[EN] In this paper, we demonstrate the experimental transmission of 16-and 64-quadrature amplitude modulation (QAM) Long Term Evolution -Orthogonal Frequency Division Multiplexing (LTE-OFDM) signals by using mil-limetre ...
Diseño de redes de acceso ópticas para comunicaciones 5G basadas en la generación fotónica de las señales de onda milimétrica

Gonzálvez Raga, Borja (Universitat Politècnica de València, 2021-10-11)

[ES] El proyecto consiste en comprender la arquitectura y tecnologías empleadas en las redes ópticas de acceso radio centralizadas (C-RAN) para comunicaciones 5G. Se utilizará la técnica fotónica basada en modulación ...
Experimental comparison of DSB and CS-DSB mmW formats over a hybrid fiber and FSO fronthaul network for 5G

Bohata, J.; Nguyen, D.N.; Spacil, J.; Komanec, M.; Ortega Tamarit, Beatriz; Vallejo-Castro, Luis; Ghassemlooy, Z.; Zvanovec, S. (The Optical Society, 2021-08-16)

[EN] The telecommunication world is experiencing the 5th generation (5G) networks deployment including the use of millimeter wave (mmW) frequency bands to satisfy capacity demands. This leads to the extensive use of optical ...
Full-duplex transmission of multi-Gb/s subcarrier multiplexing and 5G NR signals in 39 GHz band over fiber and space

Nguyen, Dong-Nhat; Vallejo-Castro, Luis; Almenar Terre, Vicenç; Ortega Tamarit, Beatriz; Dat, Pham Tien; Le, Son Thai; Bohata, Jan; Zvanovec, Stanislav (The Optical Society, 2022-02-10)

[EN] We propose a stable full-duplex transmission of millimeter-wave signals over a hybrid single-mode fiber (SMF) and free-space optics (FSO) link for the fifth-generation (5G) radio access networks to accelerate the ...
Harmonic and Intermodulation Distortion Analysis in Directly Modulated Lasers Over Local and Remote Photonically Generated Millimeter-Wave Signals

Vallejo-Castro, Luis; Mora Almerich, José; Ortega Tamarit, Beatriz (Institute of Electrical and Electronics Engineers, 2022-08-01)

[EN] This paper presents a comprehensive analytical derivation and experimental evaluation of the impact of harmonic and intermodulation distortion on data transmission over local and remote photonically generated millimeter ...
Impact of Thermal-Induced Turbulent Distribution Along FSO Link on Transmission of Photonically Generated mmW Signals in the Frequency Range 26¿40 GHz

Vallejo-Castro, Luis; Komanec, Matej; Ortega Tamarit, Beatriz; Bohata, Jan; Nguyen, Dong-Nhat; Zvanovec, Stanislav; Almenar Terre, Vicenç (Institute of Electrical and Electronics Engineers, 2020-02)

[EN] Microwave photonics is a promising solution to transmit millimeter wave (mmW) signals for the 5th generation (5G) mobile communications as part of a centralized radio access network (C-RAN). In this paper, we ...
M-QAM signal transmission at the photonically generated K-band over thermal-induced turbulent FSO links with different turbulence distributions

Vallejo-Castro, Luis; Nguyen, Dong-Nhat; Bohata, Jan; Ortega Tamarit, Beatriz; Zvanovec, Stanislav (The Optical Society, 2020-06-01)

[EN] We present a theoretical and experimental study on the impact of different thermal-induced free-space turbulence distributions on the M-quadrature amplitude modulation (M-QAM) signal transmission in radio frequency ...
On N-PAM and M-QAM implementation within the hybrid RoF-FSO-PON system

Nguyen, Dong-Nhat; Zvanovec, Stanislav; Bohata, Jan; Ortega Tamarit, Beatriz; Vallejo-Castro, Luis; Ghassemlooy, Zabih (IEEE, 2020-11-25)

[EN] This paper investigates an optical transmission architecture of a passive optical network (PON), which is compatible with the millimeter-wave radio-over-fiber and free-space optics systems (RoF-FSO) under weak-to-strong ...
On the 40 GHz Remote Versus Local Photonic Generation for DML-Based C-RAN Optical Fronthaul

Vallejo-Castro, Luis; Mora Almerich, José; Nguyen, Dong-Nhat; Bohata, Jan; Almenar Terre, Vicenç; Zvanovec, Stanislav; Ortega Tamarit, Beatriz (Institute of Electrical and Electronics Engineers, 2021-11-01)

[EN] Local and remote photonic millimeter wave (mmW) signal generation schemes are theoretically and experimentally evaluated in order to compare both approaches for practical deployment in a cloud radio access network ...
Optical CS-DSB Schemes for 5G mmW Fronthaul Seamless Transmission

Bohata, Jan; Vallejo-Castro, Luis; Ortega Tamarit, Beatriz; Zvanovec, Stanislav (Institute of Electrical and Electronics Engineers, 2022-04)

[EN] This paper describes the experimental demonstration of the hybrid optical/millimeter wave signal generation and transmission over combined optical fiber and free space optics fronthaul network with a seamless antenna ...
Photonic Millimeter Wave Signal Generation and Transmission Over Hybrid Links in 5G Communication Networks

Vallejo Castro, Luis (Universitat Politècnica de València, 2022-11-28)

[ES] El estándar de quinta generación (5G) es la clave potencial para satisfacer el aumento exponencial en la demanda de nuevas aplicaciones, servicios y usuarios. La tecnología 5G ofrecerá una latencia extremadamente baja ...
Photonic multiple millimeter wave signal generation and distribution overreconfigurable hybrid SSMF/FSO links

Vallejo-Castro, Luis; Ortega Tamarit, Beatriz; Bohata, Jan; Zvanovec, Stanislav; Almenar Terre, Vicenç (Elsevier, 2020-01)

[EN] Microwave photonics provides attractive solutions for millimeter wave (mmW) signal generation. In this paper, we demonstrate photonically generated multiple mmW signals transmission over a wavelength division multiplexed ...
THz-band based wireless communications systems in trains

López Brischoux, Elsa (Universitat Politècnica de València, 2023-07-26)

[ES] Las redes 6G requieren el uso del espectro extendido hacia frecuencias más altas, como son las ondas milimétricas, la banda de los THz e incluso las comunicaciones en el espectro visible. Este trabajo se centra en ...
Transmission of 2 bits/symbol over RoF and RoFSO links with different architectures for ubiquitous coverage

Nguyen, Dong-Nhat; Zvanovec, Stanislav; Vallejo-Castro, Luis; Ortega Tamarit, Beatriz; Bohata, Jan; Ghassemlooy, Zabih (IEEE, 2020-07-22)

[EN] This paper investigates integrated radio-over-fiber and radio-over-free-space optic links in a passive optical network architecture for ubiquitous wireless coverage. Two optical millimeter-wave generation techniques, ...
Usability of a 5G fronthaul based on a DML and external modulation for M-QAM transmission over photonically generated 40 GHz

Vallejo-Castro, Luis; Ortega Tamarit, Beatriz; Nguyen, Dong-Nhat; Bohata, Jan; Almenar Terre, Vicenç; Zvanovec, Stanislav (Institute of Electrical and Electronics Engineers, 2020)

[EN] In this paper, we numerically and experimentally present the bandwidth constraints of a cost-effective 5G mobile fronthaul based on a directly-modulated laser for data modulation and a Mach-Zehnder modulator-based ...
Wideband QAM-over-SMF/turbulent FSO downlinks in a PON architecture for ubiquitous connectivity

Nguyen, Dong-Nhat; Vallejo-Castro, Luis; Bohata, Jan; Ortega Tamarit, Beatriz; Ghassemlooy, Zabih; Zvanovec, Stanislav (Elsevier, 2020-11-15)

[EN] We propose and investigate for the first time a seamless millimeter-wave (mmW) radio-over-fiber (RoF) and radio-over-free-space optics (FSO)-based downlink for use in a passive optical network architecture using 4-, ...