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In the work there are researches of the ways to increase the noise immunity of DVB-T2 standard using the standardized characteristics of the systems, there is a comparative analysis of these parameters in DVB-T and DVB-T2 systems and the ways to increase the noise immunity of terrestrial digital television system. The dependencies of the bit error ratio (BER) on the signal/noise ratio were investigated and analyzed. The comparative analysis of data, parameters in DVB-T and DVB-T2 systems was carried out. There was made a comparison of "signal/noise" relations at the same transmission speeds and there were given technical data for transmission modes, allowing providing the maximum system capacity, which is achieved at the maximum FFT dimension, the highest modulation order and the minimum protective interval. Research results are given as: Bit error ratio dependence on signal/noise ratio, modulation parameters, TV signal transmission speed and normalized parameters of DVB-T and DVB-T2 systems. To study the parameters and characteristics of QPSK modulated signals the "Program for calculation of QPSK modulated signals time diagrams" in the Borland Delphi programming environment was developed.

 

  • Internet ҳавола
  • DOI
  • UzSCI тизимида яратилган сана 04-08-2020
  • Ўқишлар сони 502
  • Нашр санаси 20-05-2020
  • Мақола тилиIngliz
  • Саҳифалар сони14-20
Ўзбек

Ushbu ishda standartlashtirilgan tavsiflarni qo‘llagan holda DVB–T2 tizimining halaqitbardoshligini oshirish usullari tadqiq etilgan, DVB–T va DVB–T2 tizim parametrlarining ma’lumotlarini qiyosiy tahlillari va DVB–T2 tizimining halaqitbardoshligini oshirish usuli keltirilgan. Bitlar xatoligi koeffitsiyentini (BER) «signal/shovqin»  nisbatiga bog‘liqligi tadqiq etildi. DVB–T va DVB–T2 tizimidagi parametrlarning ma’lumotlarini qiyosiy tahlili olib borildi. FFT ning maksimal o‘lchov qiymatida, yuqori modulyatsiya tartibida va minimal himoya intervalini e’tiborga olgan holda  tizimning maksimal o‘tkazish qobiliyatini amalga oshirish uchun uzatish tezligi bir xil bo‘lganda, «signal/shovqin»  nisbatining qiyosiy tahlili amalga oshirildi va uzatish rejimi uchun texnik ma’lumotlar taqdim etildi. Ishda tadqiqotning quyidagi natijalari keltirilgan: bitlar xatoligi koeffitsiyentini  «signal/shovqin»  nisbatiga bog‘liqligi, modulyatsiya parametrlari, televizion signallarning uzatilish tezliklari va DVB–T i DVB–T2  tizimlarning me’yoriy paramerlari. QPSK modulyatsiyalangan signallar parametrlarini va tavsiflarini tadqiq etish uchun Borland Delphi dasturida «Modulyatsiyalangan QPSK signallar vaqt diagrammasini hisoblash uchun dastur» ishlab chiqilgan.

 

Калит сўзлар
English

In the work there are researches of the ways to increase the noise immunity of DVB-T2 standard using the standardized characteristics of the systems, there is a comparative analysis of these parameters in DVB-T and DVB-T2 systems and the ways to increase the noise immunity of terrestrial digital television system. The dependencies of the bit error ratio (BER) on the signal/noise ratio were investigated and analyzed. The comparative analysis of data, parameters in DVB-T and DVB-T2 systems was carried out. There was made a comparison of "signal/noise" relations at the same transmission speeds and there were given technical data for transmission modes, allowing providing the maximum system capacity, which is achieved at the maximum FFT dimension, the highest modulation order and the minimum protective interval. Research results are given as: Bit error ratio dependence on signal/noise ratio, modulation parameters, TV signal transmission speed and normalized parameters of DVB-T and DVB-T2 systems. To study the parameters and characteristics of QPSK modulated signals the "Program for calculation of QPSK modulated signals time diagrams" in the Borland Delphi programming environment was developed.

 

Русский

В cтатье рассматриваются результаты исследования способов повышения помехоустойчивости стандарта DVB–T2 с использованием стандартизированных характеристик систем. Приведены сравнительный анализ данных параметров в системах DVB–T и DVB–T2 и рассматрены способы повышения помехоустойчивости системы эфирного цифрового телевидения. Представлены результаты анализа зависимости  коэффициента битовых ошибок (BER) от отношения «сигнал/шум». Показано сравнительный анализ параметров в системах DVB–T и DVB–T2. Сравнение отношений «сигнал/шум» при одинаковых скоростях передачи и представлены технические данные для режимов передачи, позволяющие обеспечить максимальную пропускную способность системы, которая достигается при максимальной размерности FFT, при наивысшем порядке модуляции и минимальном защитном интервале. Приведены такие результаты исследования, как: зависимости коэффициента битовых ошибок от отношения «сигнал/шум», модуляционные параметры, скорости передачи телевизионных сигналов и нормированные параметры систем DVB–T и DVB–T2. Для исследования параметров и характеристик QPSK модулированных сигналов. Разработана «Программа для расчета временных диаграмм QPSK модулированных сигналов» в  среде программирования Borland Delphi.

Калит сўзлар
№ Муаллифнинг исми Лавозими Ташкилот номи
1 Jabborov A.B. Assistant TDTU
№ Ҳавола номи
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