IJE TRANSACTIONS A: Basics Vol. 31, No. 4 (April 2018) 308-315    Article in Press

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C. K. K and J. J
( Received: August 08, 2017 – Accepted: 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 frequency 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,QPSK.


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