This article discusses methods for modeling and analyzing satellite communication channel characteristics. Simulations were conducted using MATLAB/Simulink, NS-3, and STK tools based on AWGN, Rayleigh, Rician, and hybrid models for GEO and LEO scenarios. The average SNR was 19.7 dB in the GEO–Tashkent channel, and a decrease of up to 11.3 dB in the rain zone. The BER values for QPSK and 16-QAM modulations were 2.3×10⁻³ (10 dB) and 4.1×10⁻³ (15 dB), respectively. In the LEO (1,200 km) scenario, the maximum Doppler shift reached ±190 kHz. The availability decreased to 87% at 25 mm/h and 74% at 50 mm/h.
| Mualliflar | Xudoyberdiyev, Rahmatillo |
|---|---|
| Jurnal | Al-Farg'oniy avlodlari |
| Nashr sanasi | 2025-10-08 |
| Son | 3 |
| Betlar | 182-187 |
| Til | Rus |
спутниковые системы связи, моделирование канала, замирание сигнала, MATLAB, NS-3, AWGN, Райс, SNR., sun’iy yo‘ldosh aloqa tizimlari, kanal modellashtirish, fading, MATLAB, NS-3, AWGN, Rician, SNR., satellite communication systems, channel modeling, fading, MATLAB, NS-3, AWGN, Rician, SNR
Activation functions play a vital role in the training dynamics and generalization performance of deep learning models. This study presents a comparative analysis of ten widely used activation functions—ReLU, Sigmoid…
This paper addresses the problem of managing multi-parameter data flows in monitoring and treatment of livestock wastewater based on sensor measurements. A sensor network was deployed to collect key water quality…
This study investigates the causes of atmospheric pollution from motor vehicles and explores methods for reducing the concentration of harmful substances in the air. Based on the analysis of data from various sources…
The increase in the creation of fake web pages by attackers is leading to a sharp increase in cyberattacks. Attackers use these fake web sites to advertise products to Internet users, distribute malicious programs, or…
This article addresses the problem of constructing numerical solutions of hydrodynamic equations in the form of nonlinear partial differential equations describing the three-dimensional velocity of atmospheric air…
Abstract: Heating, Ventilation, and Air Conditioning (HVAC) systems account for about 40% of building energy use. Their performance is strongly affected by uncertain external factors such as weather and stochastic…
In this study, digital image processing and a convolutional neural network (CNN) were integrated to automatically detect mitral stenosis based on 32 echocardiogram videos. By applying data augmentation, the training…
The solutions of two-parameter singularly perturbed boundary value problems usually include two boundary layers. Because of the presence of these layers, conventional numerical methods are considered inefficient for…
This study analyzes geometry and short-time hydration of two wheat varieties from Uzbekistan, “Asr” and “Alekseevich.” Grain dimensions were measured by digital caliper, microstructure examined microscopically, and…
This paper investigates the application of neural networks in cryptanalysis processes using the Vigenere cipher as a case study. Although the Vigenere cipher, one of the classical polyalphabetic substitution algorithms…