Comparative Analysis of Real-Time Implemented DVB Systems Using Hierarchical Modulation

Abstract

This paper is related to the studies of the implementation of the block diagrams of various digital video broadcasting techniques like DVBT, DVBS, and DVBC. Digital televisions, in contrast to analog televisions, compress data into "packets." Encoding and decoding are performed on the data, ensuring high-quality multimedia without the lag of analog television broadcasting. The relevant specifications for the multipoint distribution of data, a limited number of return channels, and the interactivity solutions of DVB networks are the foundation of these networks. The choice of MPEG-2, one of several MPEG standards for compressing audio and video signals, was a major decision made by the DVB Project. By reducing a single signal's bandwidth from 166 Mbps to 5 Mbps, MPEG-2 makes it possible for broadcasters to transmit digital signals over the cable, satellite, and terrestrial networks they already have in place.

There are many concepts and stages which are part of the process of implementing the communication processes mentioned above, which mostly includes methods of various error correcting codes like convolution code, reed solemn code, and LDPC codes, modulation methods like QPSK and QAM with various rate, OFDM, the concept of MIMO, hierarchical modulation scheme, etc., This paper shows the comparative analysis of real-time implemented DVB systems, especially using hierarchical modulation for the implementation work.