A survey of digital television broadcast transmission techniques

This paper is a survey of the transmission techniques used in digital television (TV) standards worldwide. With the increase in the demand for High-Definition (HD) TV, video-on-demand and mobile TV services, there was a real need for more bandwidth-efficient, flawless and crisp video quality, which motivated the migration from analogue to digital broadcasting. In this paper we present a brief history of the development of TV and then we survey the transmission technology used in different digital terrestrial, satellite, cable and mobile TV standards in different parts of the world. First, we present the Digital Video Broadcasting standards developed in Europe for terrestrial (DVB-T/T2), for satellite (DVB-S/S2), for cable (DVB-C) and for hand-held transmission (DVB-H). We then describe the Advanced Television System Committee standards developed in the USA both for terrestrial (ATSC) and for hand-held transmission (ATSC-M/H). We continue by describing the Integrated Services Digital Broadcasting standards developed in Japan for Terrestrial (ISDB-T) and Satellite (ISDB-S) transmission and then present the International System for Digital Television (ISDTV), which was developed in Brazil by adopteding the ISDB-T physical layer architecture. Following the ISDTV, we describe the Digital Terrestrial television Multimedia Broadcast (DTMB) standard developed in China. Finally, as a design example, we highlight the physical layer implementation of the DVB-T2 standar

Mobile Communication Networks and Digital Television Broadcasting Systems in the Same Frequency Bands – Advanced Co-Existence Scenarios

The increasing demand for wireless multimedia services provided by modern communication systems with stable services is a key feature of advanced markets. On the other hand, these systems can many times operate in a neighboring or in the same frequency bands. Therefore, numerous unwanted co-existence scenarios can occur. The aim of this paper is to summarize our results which were achieved during exploration and measurement of the co-existences between still used and upcoming mobile networks (from GSM to LTE) and digital terrestrial television broadcasting (DVB) systems. For all of these measurements and their evaluation universal measurement testbed has been proposed and used. Results presented in this paper are a significant part of our activities in work package WP5 in the ENIAC JU project “Agile RF Transceivers and Front-Ends for Future Smart Multi-Standard Communications Applications (ARTEMOS)”

Analysis and Performance Comparison of DVB-T and DTMB Systems for Terrestrial Digital TV

Orthogonal frequency-division multiplexing (OFDM) is the most popular transmission technology in digital terrestrial broadcasting (DTTB), adopted by many DTTB standards. In this paper, the bit error rate (BER) performance of two DTTB systems, namely cyclic prefix OFDM (CP-OFDM) based DVB-T and time domain synchronous OFDM (TDS-OFDM) based DTMB, is evaluated in different channel conditions. Spectrum utilization and power efficiency are also discussed to demonstrate the transmission overhead of both systems. Simulation results show that the performances of the two systems are much close. Given the same ratio of guard interval (GI), the DVB-T outperforms DTMB in terms of signal to noise ratio (SNR) in Gaussian and Ricean channels, while DTMB behaves better performance in Rayleigh channel in higher code rates and higher orders of constellation thanks to its efficient channel coding and interleaving scheme

Delivery of broadband services to SubSaharan Africa via Nigerian communications satellite

Africa is the least wired continent in the world in terms of robust telecommunications infrastructure and systems to cater for its more than one billion people. African nations are mostly still in the early stages of Information Communications Technology (ICT) development as verified by the relatively low ICT Development Index (IDI) values of all countries in the African region. In developing nations, mobile broadband subscriptions and penetration between 2000-2009 was increasingly more popular than fixed broadband subscriptions. To achieve the goal of universal access, with rapid implementation of ICT infrastructure to complement the sparsely distributed terrestrial networks in the hinterlands and leveraging the adequate submarine cables along the African coastline, African nations and their stakeholders are promoting and implementing Communication Satellite systems, particularly in Nigeria, to help bridge the digital hiatus. This paper examines the effectiveness of communication satellites in delivering broadband-based services

Indo-U.S. FTA - Prospects for Audiovisual Services

Many WTO (World Trade Organization) member countries, including India, are defensive about opening up of the audiovisual sector in the Doha Round due to reasons of cultural sensitivity. On the other hand, the United States is pushing for liberalizing trade in this sector both in the WTO and in its bilateral FTAs (Free Trade Agreements). With the slow progress of the Doha Round, India and the United States are exploring the possibilities of entering into FTAs with like-minded trading partners. In this context, the present paper discusses the prospects of liberalizing audiovisual services under a possible Indo-U.S. FTA. The study found that India and the United States have significant trade complementarities in this sector which can be further enhanced under an FTA. It identifies areas such as co-production of films, digital content creation and broadband infrastructure in which companies from India and the United States can enter into mutually beneficial collaborations. It argues that India should enter into a media cooperation agreement with the U.S. to facilitate the inflow of technical know, finance and best management practices. It discusses regulatory and other reforms which would not only improve the productivity and global competitiveness of the Indian audiovisual sector but also enable it to gain from the FTA.Indo-U.S. FTA, GATS, bilateral agreements, audiovisual, Services

Preamble design using embedded signalling for OFDM broadcast systems based on reduced-complexity distance detection

The second generation digital terrestrial television broadcasting standard (DVB-T2) adopts the so-called P1 symbol as the preamble for initial synchronization. The P1 symbol also carries a number of basic transmission parameters, including the fast Fourier transform size and the single-input/single-output as well as multiple-input/single-output mode, in order to appropriately configure the receiver for carrying out the subsequent processing. In this contribution, an improved preamble design is proposed, where a pair of training sequences is inserted in the frequency domain and their distance is used for transmission parameter signalling. At the receiver, only a low-complexity correlator is required for the detection of the signalling. Both the coarse carrier frequency offset and the signalling can be simultaneously estimated by detecting the above-mentioned correlation. Compared to the standardised P1 symbol, the proposed preamble design significantly reduces the complexity of the receiver while retaining high robustness in frequency-selective fading channels. Furthermore, we demonstrate that the proposed preamble design achieves a better signalling performance than the standardised P1 symbol, despite reducing the numbers of multiplications and additions by about 40% and 20%, respectively

Indo-U.S. FTA: Prospects for Audiovisual Services

Many WTO (World Trade Organization) member countries, including India, are defensive about opening up of the audiovisual sector in the Doha Round due to reasons of cultural sensitivity. On the other hand, the United States is pushing for liberalizing trade in this sector - both in the WTO and in its bilateral FTAs (Free Trade Agreements). With the slow progress of the Doha Round, India and the United States are exploring the possibilities of entering into FTAs with like-minded trading partners. In this context, the present paper discusses the prospects of liberalizing audiovisual services under a possible Indo-U.S. FTA. The study found that India and the United States have significant trade complementarities in this sector which can be further enhanced under an FTA. It identifies areas such as co-production of films, digital content creation and broadband infrastructure in which companies from India and the United States can enter into mutually beneficial collaborations. It argues that India should enter into a media cooperation agreement with the U.S. to facilitate the inflow of technical know, finance and best management practices. It discusses regulatory and other reforms which would not only improve the productivity and global competitiveness of the Indian audiovisual sector but also enable it to gain from the FTA.Indo-U.S. FTA, GATS, bilateral agreements, audiovisual, services