bsuirДоклады БГУИРDoklady BGUIR1729-76482708-0382БГУИР10.35596/1729-7648-2026-24-2-46-54bsuir-4341Research ArticleСтатьиАнализ адаптивных схем модуляции и кодирования в системах вещания DVB-T2 для повышения устойчивости сигнала, эффективности передачи и общего качества обслуживанияAnalysis of Adaptive Modulation and Coding Schemes in DVB-T2 Broadcasting Systems to Improve Signal Stability, Transmission Efficiency and Overall Quality of ServiceАйеорибеОлареважу ПитерAyeoribeOlarewaju Peter

PhD, Researcher at the Department of Electrical and Electronic Engineering

 

ayeoribe.olarewaju@gmail.comФедеральный университет Ойе-ЭкитиFederal University Oye-Ekiti2026080520262424654Copyright © Айеорибе О., 20262026Айеорибе О.Ayeoribe O.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://doklady.bsuir.by/jour/article/view/4341

Исследована производительность адаптивной модуляции и кодирования в системах цифрового вещания второго поколения (DVB-T2) с точки зрения надежности передаваемого сигнала, уровня сложности использования пропускной способности канала и качества поддерживаемой услуги. Проведена оценка производительности схем модуляции квадратурной фазовой манипуляции QPSK (16QAM, 64QAM, 256QAM) с помощью кодов с низкой плотностью проверок на четность (LDPC) со скоростями 1/2–9/10 в контексте применения этих схем для обеспечения высококачественного цифрового наземного телевизионного вещания на основе методов адаптивной модуляции и кодирования. В результате моделирования получены характеристики битовой ошибки различных схем модуляции с использованием кодов LDPC при разных скоростях в каналах аддитивного белого гауссовского шума и многолучевом замирании одновременно. Установлено, что более простые схемы модуляции, такие как QPSK со скоростью 1/2, могут обеспечить битовую ошибку менее 10–5 при отношении сигнал/шум 5 дБ, а наиболее сложные, такие как 256QAM со скоростью 9/10, требуют отношения сигнал/шум 25 дБ для обеспечения битовой ошибки менее 10–6. Отмечено улучшение пропускной способности канала с 1,0 бит/с/Гц для модуляции QPSK до 6,7 бит/с/Гц для 256QAM в условиях высокого отношения сигнал/шум.

The performance of adaptive modulation and coding in second-generation digital broadcasting systems (DVB-T2) is investigated in terms of the reliability of the transmitted signal, the efficiency of channel bandwidth utilization, and the quality of the supported service. The performance of quadrature phase-shift keying (QPSK) modulation schemes (16QAM, 64QAM, 256QAM) using low-density parity-check (LDPC) codes with rates of 1/2–9/10 is assessed in the context of their application to provide high-quality digital terrestrial television broadcasting based on adaptive modulation and coding methods. The simulation results yielded bit error char acteristics for various modulation schemes using LDPC codes at different rates in channels with additive white Gaussian noise and multipath fading simultaneously. It was found that simpler modulation schemes, such as 1/2 rate QPSK, can provide a bit error rate of less than 10–5 at a signal-to-noise ratio of 5 dB, while more complex ones, such as 9/10 rate 256QAM, require a signal-to-noise ratio of 25 dB to provide a bit error rate of less than 10–6. An improvement in channel throughput was noted from 1.0 bps/Hz for QPSK modulation to 6.7 bps/Hz for 256QAM under high signal-to-noise ratio conditions.

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The authors declare that there are no conflicts of interest present.