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Wyszukujesz frazę "Kumar, Ritesh" wg kryterium: Autor


Wyświetlanie 1-4 z 4
Tytuł:
Delay analysis of ring resonator-based beam-forming network in z-domain
Autorzy:
Nadeem, Md. Danish
Raghuwanshi, Sanjeev Kumar
Kumar, Ritesh
Tematy:
antenna element
beam-forming network
optical ring resonator
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Data publikacji:
2024
Powiązania:
https://bibliotekanauki.pl/articles/59112949.pdf  Link otwiera się w nowym oknie
Źródło:
Opto-Electronics Review; 2024, 32, 2
1230-3402
Pojawia się w:
Opto-Electronics Review
Opis:
During the next generation of wireless cellular networks, the millimeter-wave (mm-wave) spectrum will bring new opportunities for exceptionally high data transfer speeds and extensive network connectivity. Millimeter waves, on the other hand, are subject to a significant loss of propagation, which is the most significant impediment. A beneficial solution to this difficulty, which can be overcome, is to use a beam-forming system that consists of many antennas. The purpose of this study is to provide a concept for an integrated photonic beam-forming system that utilises multiple ring resonators for a 1 × 4 phase array antenna operating in the Ka-Band frequency range. The waveguide technology is the foundation for a signal that operates at 28 GHz. It is through the use of the optical ring resonator that the actual time delay line may accomplish its goal. The suggested method can be implemented as a variable true time delay (TTD) line to change the radiation angle of phase array antennas (PAA). The main lobe radiated by the PAA can be directed squint-free between the angles from -28° to +28°. The mathematical analysis and design of the beam producing the structure are presented. Following that, delays of 650 ps, 350 ps, and 250 ps could be produced with coupling coefficients of κ=0.5, κ=0.7, and κ=0.9, respectively, and the associated phase shifts were 0.469π, 0.146π, and 0.387π.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A control topology for frequency regulation capability in a grid integrated PV system
Autorzy:
Kumar, Ritesh
Sahu, Balakrushna
Shiva, Chandan Kumar
Rajender, B.
Tematy:
frequency controller
maximum power point tracking (MPPT)
photovoltaic (PV)
power system
pseudo maximum power point tracking (PMPPT)
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Data publikacji:
2020
Powiązania:
https://bibliotekanauki.pl/articles/140902.pdf  Link otwiera się w nowym oknie
Źródło:
Archives of Electrical Engineering; 2020, 69, 2; 389-401
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Opis:
Photovoltaic (PV) cells are very costly because of the silicon element which is not cheaply available. Usually, PV cells are preferred to be used at maximum efficiency. Therefore, PV plants are emphasized to extract maximum power from PV cells. When inertia free PV plants are integrated into the grid in large numbers, the problem of maintaining system stability subjected to load perturbation is quite difficult. In response to this, a control topology is being an approach to make available the PV cells in maintaining system stability by utilizing the system frequency deviation as feedback to the controller. To implement this, the PVs are operated at Maximum Power Point Tracking (MPPT). This allows the PV to operate at Pseudo Maximum Power Point tracking (PMPPT) which makes it possible to run the PV with reserve power capacity without employing a battery for storage. The control strategy has been implemented over a two-stage power conversion model of the PV system. The simulation results showed that the proposed control PMPPT topology is effective in frequency regulation capability as compared to the MPPT technique.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Selective-Decode and Forward Relaying Protocol over κ-µ Fading Channel Distribution
Autorzy:
Shankar, Ravi
Bhardwaj, Lokesh
Mishra, Ritesh Kumar
Tematy:
channel fading
channel state information
relaying protocol
selective decode and forward
symbol error rate
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Data publikacji:
2020
Powiązania:
https://bibliotekanauki.pl/articles/309566.pdf  Link otwiera się w nowym oknie
Źródło:
Journal of Telecommunications and Information Technology; 2020, 1; 21-30
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Opis:
In this work, the performance of selective-decode and forward (S-DF) relay systems over κ-µ fading channel conditions is examined in terms of probability density function (PDF), system model and cumulative distribution function (CDF) of the κ-µ distributed envelope, signal-to-noise ratio and the techniques used to generate samples that rely on κ-µ distribution. Specifically, we consider a case where the sourceto-relay, relay-to-destination and source-to-destination link is subject to independent and identically distributed κ-µ fading. From the simulation results, the enhancement in the symbol error rate (SER) with a stronger line of sight (LOS) component is observed. This shows that S-DF relaying systems may perform well even in non-fading or LOS conditions. Monte Carlo simulations are conducted for various fading parameter values and the outcomes turn out to be a close match for theoretical results, which validates the derivations made.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of Vehicular S-LSTM NOMA Over Time Selective Nakagami-m Fading with Imperfect CSI
Autorzy:
Shankar, Ravi
Chaudhary, Bhanu Pratap
Mishra, Ritesh Kumar
Tematy:
inter-symbol interference
MIMO
NOMA
orthogonal frequency division multiplexing
OFDM
S-LSTM
zero-mean circularly symmetric complex Gaussian
ZM-CSCG
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Data publikacji:
2022
Powiązania:
https://bibliotekanauki.pl/articles/2174454.pdf  Link otwiera się w nowym oknie
Źródło:
Journal of Telecommunications and Information Technology; 2022, 4; 47--59
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Opis:
In this paper, the performance of a deep learningbased multiple-input multiple-output (MIMO) non-orthogonal multiple access (NOMA) system is investigated for 5G radio communication networks. We consider independent and identically distributed (i.i.d.) Nakagami-m fading links to prove that when using MIMO with the NOMA system, the outage probability (OP) and end-to-end symbol error rate (SER) improve, even in the presence of imperfect channel state information (CSI) and successive interference cancellation (SIC) errors. Furthermore, the stacked long short-term memory (S-LSTM) algorithm is employed to improve the system’s performance, even under time-selective channel conditions and in the presence of terminal’s mobility. For vehicular NOMA networks, OP, SER, and ergodic sum rate have been formulated. Simulations show that an S-LSTM-based DL-NOMA receiver outperforms least square (LS) and minimum mean square error (MMSE) receivers. Furthermore, it has been discovered that the performance of the end-to-end system degrades with the growing amount of node mobility, or if CSI knowledge remains poor. Simulated curves are in close agreement with the analytical results.
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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