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Mostrando ítems 1-9 de 9

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 ...
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 ...
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 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 ...
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 ...

Mostrando ítems 1-9 de 9

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