TY - JOUR ID - 73154 TI - An Efficient Hierarchical Modulation based Orthogonal Frequency Division Multiplexing Transmission Scheme for Digital Video Broadcasting JO - International Journal of Engineering JA - IJE LA - en SN - 1025-2495 AU - Chandra Kala, K AU - Jayakumari, J AD - Department of Electronics and Communication Engineering, NoorulIslam centre for Higher Education, Thuckalay, India AD - Mar Baselios College of Engineering and Technology, Trivandrum, Kerala, India Y1 - 2018 PY - 2018 VL - 31 IS - 4 SP - 574 EP - 579 KW - Digital Video Broadcasting KW - Local Content KW - Global Content KW - Single Frequency Network KW - Orthogonal Frequency Division Multiplexing KW - Hierarchical Modulation KW - Quatrature Amplitude Modulation KW - Quadrature Phase Shift Keying DO - N2 - 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. UR - https://www.ije.ir/article_73154.html L1 - https://www.ije.ir/article_73154_065d2bf4b6813b1890b0475030a40d8f.pdf ER -