IJE TRANSACTIONS A: Basics Vol. 31, No. 4 (April 2018) 574-579    Article in Press

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K. Chandra-Kala and J. Jayakumari
( Received: August 08, 2017 – Accepted in Revised Form: January 04, 2018 )

Abstract    Due to the increase of users the efficient usage of spectrum plays an important role in digital terrestrial television networks. In digital video broadcasting, local and global content are transmitted by single frequency network and multifrequency network respectively. Multifrequency network support transmission of global content and it consumes large spectrum. Similarly local content are well supported by single frequency network. In order to provide better spectral efficiency both local and global contents are transmitted in single constellation using hierarchical modulation. Hierarchical modulated OFDM system provides good spectral efficiency and robustness to the fading environment. In this paper a hierarchical modulated OFDM system for local service insertion is analyzed and its performance under various channels is been discussed. Convolutional encoder is used in this paper.


Keywords    Digital Video Broadcasting; Local Content; Global Content; Single Frequency Network; Orthogonal Frequency Division Multiplexing; Hierarchical Modulation; Quatrature Amplitude Modulation; Quadrature Phase Shift Keying



بدلیل افزایش کاربران نقش استفاده از طیف در شبکه تلویزیونی دیجیتالی از اهمیت خاصی برخوردار است. در زمینه پخش ویدئو دیجیتالی محتوی شبکه با فرکانس چندگانه بصورت محلی یاجهانی پخش می شوند. شبکه با فرکانس چندگانه با پشتیبانی از محتوی جهانی در طیف وسیع پخش می گردد. بهمین منوال شبکه با محتوی محلی با فرکانس منفرد پخش می شود. برای بهبود راندمان شبکه محلی و جهانی با فرکانس مستقل از مدولاسیون سلسله مراتبی استفاده گردید. استفاده از چنین مدولاسیون با فرکانس ارتوگونال بخش مولتی پلکس راندمان مناسبی را فراهم می سازد که درمقابل محو شدن امواج در محیط استحکام مناسبی دارد. در این مقاله سیستم مدولاسیون OFDM برای خدمات محلی آنالیز شده و کارائی کانال های مختلف بحث شده است. در این مقاله از رمزگذار انقباضی استفاده گردید.


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