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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 havola
  • DOI
  • UzSCI tizimida yaratilgan sana 04-08-2020
  • O'qishlar soni 494
  • Nashr sanasi 20-05-2020
  • Asosiy tilIngliz
  • Sahifalar14-20
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.

 

Kalit so'z
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.

Kalit so'z
№ Muallifning F.I.Sh. Lavozimi Tashkilot nomi
1 Jabborov A.B. Assistant TDTU
№ Havola nomi
1 Ananich. A.V. DVB-T2 standard: a new stage in the development of terrestrial digital broadcasting. [Electronic resource].-Access mode http://giprosvjaz.by/infresource/?q=node/254486.
2 Nazarov A.M, Yarmuhamedov A.A, Khudoyberganov Sh.K, Yusupov Y.T, Zhabborov A.B. Certificate on official registration of the program for electronic computers No. DGU06561 (dated June 04, 2019) “Program for calculating the QPSK time diagrams of modulated signals”.04.06.2019 y.
3 ETSI EN 302 755 V1.1.1 (2009–09) European Standard (Telecommunications series) Digital Video Broadcasting (DVB); Frame structure channel coding and modulation for a second generation digital terrestrial television broadcasting system (DVB – T2).
4 Digital Video Broadcasting (DVB); Framing structure, channel coding and modulation for digital terrestrial television: ETSI EN 300 744. V1.6.1. ETSI, 2009. – 66 p.
5 Krasnoselsky I.N. Investigation of the noise immunity of a DVBT system on a channel model with multipath propagation / I.N. Krasnoselsky, S. A. Kanev // Telecommunication, 2010. No. 7. S. 28-30.
6 Krasnoselsky I.N., Kanev S.A. Investigation of the noise immunity of the DVB-T digital broadcasting system on a channel model with impulse noise // Transactions of NIIR, 2009. No3. S. 66 - 71.
7 Digital broadcasting of DVB – T and DVB – T2 in Europe and in the World. [Electronic resource]. - Access mode: http://tvnews.by/tb/2200-dvb-t-i-dvb-t2-v-evrope-i-vmire.html.
8 Sklyar B. Digital communication. Theoretical foundations and practical application. Ed. 2nd, rev .: Transl. From English. - M.: Williams Publishing House, 2004.– 1104 p.
9 Karyakin V. L. Digital television: a textbook for high schools, 2nd ed., Revised and supplemented / V.L. Karjakin // - M .: Solon-Press, 2013. 10 – 12 p.
10 ETSI TR 101 290 V1.3.1 (2014-07). Digital Video Broadcasting (DVB); Measurement guidelines for DVB systems // Digital Television Broadcasting (DVB); Measurement recommendations for DVB systems.
11 ETSI TS 102 773 V1.3.1, (2012-01): Digital Video Broadcasting (DVB); Modulator Interface (T2-MI) for a second generation digital terrestrial television broadcasting system (DVB-T2) // Digital television broadcasting (DVB); Interface (T2-MI) of the modulator for second generation digital terrestrial television broadcasting (DVB-T2) systems.
12 Korzhikhin E.O. Features of the construction of single-frequency networks in the new digital broadcasting standard DVB-T2 . 5-6 p.
13 GOST R 54458-2011. Digital broadcast television. Transportation of audio and video services with MPEG-4 (H.264 / AVC) compression algorithm over digital transmission systems. General technical requirements.
14 Kruglov S. We keep pace (we configure SFN) –M.: "Broadcasting. Television and radio broadcasting" No. 6,. 2014. P. 6, 7.
15 Mamaev N.S. Systems of digital television and radio broadcasting / N.S. Mamaev, Yu.N. Mamaev, B.G. Teryaev / ed. N.S. Mamaev. - M.: Hot line - Telecom, 2006 .-- 254 p. 4. Serov A.V. Broadcast digital television DVB – T / H. - SPb .: BVH –Petersburg, 2010 .-- 464 p.
16 Digital broadcasting of DVB – T and DVB – T2 in Europe and in the World. [Electronic resource]. - Access mode: http://tvnews.by/tb/2200-dvb-t-i-dvb-t2-v-evrope-i-vmire.html, free (accessed September 1, 2014).
17 Serov A. DVB – T2 - second generation digital television // Journal 625, 7/2009, Р. 70–73. Broadcasting (DVB); Measurement guidelines for DVB systems. - RTR / JTC – DVB – 77.
18 GOST RUz., 2126/:, 2013. Reliable reception areas of terrestrial digital television broadcasting. Measurement Techniques.
19 Television / Ed. V.E. Dzhakonii. – M .: Radio and communication, 2004. – 616 s.
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