19,695 research outputs found

    Reliable Download Delivery in a Terrestrial DAB Network

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    Reliable file transfer is important in broadcast networks. In this paper, we have investigated if it is useful to extend the DAB standard with Fountain codes. To evaluate this, results from measurements in a live Single Frequency Network (SFN) were used. Our results show that the existing error correction algorithms provide already reliable file delivery, so there is no need to extend the DAB standard

    Public Media and Political Independence: Lessons for the Future of Journalism From Around the World

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    Profiles how fourteen nations fund and protect the autonomy of public media via multiyear funding, public-linked funding structures, charters, laws, and agencies or boards designed to limit political influence and ensure spending in the public interest

    DYNAMICS OF INDIGENOUS LANGUAGE IN ENVIRONMENTAL COMMUNICATION

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    The seriousness of environmental issue has been brought to the fore, not only because of its significance to human sustainability but also due to its degeneration to communal conflicts, as well as emergence of miscreants and hoodlums who find expression of their destructive tendencies in environmental problems. This paper calls for a reappraisal of method of communicating environmental messages in particular reference to the language of communication. It begins with identification of environmental problems, the goal that environmental communication is meant to achieve and the inappropriateness of the English language packaged messages to achieving the goals. It stresses the significance of indigenous language use in communicating environmental massages and rounds off with examples of indigenous language communication

    Near-Instantaneously Adaptive HSDPA-Style OFDM Versus MC-CDMA Transceivers for WIFI, WIMAX, and Next-Generation Cellular Systems

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    Burts-by-burst (BbB) adaptive high-speed downlink packet access (HSDPA) style multicarrier systems are reviewed, identifying their most critical design aspects. These systems exhibit numerous attractive features, rendering them eminently eligible for employment in next-generation wireless systems. It is argued that BbB-adaptive or symbol-by-symbol adaptive orthogonal frequency division multiplex (OFDM) modems counteract the near instantaneous channel quality variations and hence attain an increased throughput or robustness in comparison to their fixed-mode counterparts. Although they act quite differently, various diversity techniques, such as Rake receivers and space-time block coding (STBC) are also capable of mitigating the channel quality variations in their effort to reduce the bit error ratio (BER), provided that the individual antenna elements experience independent fading. By contrast, in the presence of correlated fading imposed by shadowing or time-variant multiuser interference, the benefits of space-time coding erode and it is unrealistic to expect that a fixed-mode space-time coded system remains capable of maintaining a near-constant BER

    Random Linear Network Coding for 5G Mobile Video Delivery

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    An exponential increase in mobile video delivery will continue with the demand for higher resolution, multi-view and large-scale multicast video services. Novel fifth generation (5G) 3GPP New Radio (NR) standard will bring a number of new opportunities for optimizing video delivery across both 5G core and radio access networks. One of the promising approaches for video quality adaptation, throughput enhancement and erasure protection is the use of packet-level random linear network coding (RLNC). In this review paper, we discuss the integration of RLNC into the 5G NR standard, building upon the ideas and opportunities identified in 4G LTE. We explicitly identify and discuss in detail novel 5G NR features that provide support for RLNC-based video delivery in 5G, thus pointing out to the promising avenues for future research.Comment: Invited paper for Special Issue "Network and Rateless Coding for Video Streaming" - MDPI Informatio

    A survey of digital television broadcast transmission techniques

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    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

    The Role of Public Service Broadcasters in the Era of Convergence A Case Study of Televisió de Catalunya

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    The development of the convergence process has several implications in the reconfiguration of the media landscape. Public services broadcasters have new opportunities to fulfil their public service duties in a new competitive environment, which involves developing new applications on new platforms. Televisió de Catalunya, the public service broadcaster (PSB) of Catalonia, has developed a clear strategy in this new convergent environment, applying its traditional know-how to new interactive and digital media according to its public mission and getting positive feedback.convergence; public service broadcasting; interactive TV; bandwidth; 3G services; multimedia and digital divide

    Internet Radio: A New Engine for Content Diversity?

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    While traditional radio stations are subject to extensive government regulations, Internet radio stations remain largely unregulated. As Internet radio usage has increased certain stakeholders have begun to argue that these Internet radio broadcasters are providing significant and diverse programming to American audiences and that government regulation of spectrum-using radio station ownership may be further relaxed. One of the primary justifications for regulation of ownership has been to protect diversity in broadcasting. This study hypothesizes that Internet radio broadcasting does add diversity to the radio broadcasting industry and that it should be considered as relevant by regulators. This study evaluates the role of Internet radio broadcasters according to five criteria intended to gauge the level of diversity being delivered to listeners online. By measuring the levels of format, channel, ownership, location and language diversity among Internet radio stations, it is possible to draw benchmark lessons about the new medium's ability to provide Americans with diverse broadcasting options. The study finds that Internet radio broadcasters are in fact adding measurable diversity to the radio broadcasting industry. Internet broadcasters are providing audiences with access to an increasing number of stations, owners, formats, and language choices, and it is likely that technologies aiding in the mobility of access as well as broadband evolution will reinforce these findings.Comment: 29th TPRC Conference, 200

    Laboratory measurement campaign of DVB-T signal with transmit delay diversity

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    The requirements for future DVB-T/H networks demand that broadcasters design and deploy networks that provide ubiquitous reception in challenging indoors and other obstructed situations. It is essential that such networks are designed cost-effectively and with minimized environmental impact. The EC funded project PLUTO has since its start in 2006 explored the use of diversity to improve coverage in these difficult situations. The purpose of this paper is to investigate the performance of Transmit Delay Diversity (DD) with two antennas to improve the reception of DVB-T/H systems operating in different realistic propagation conditions through a series of tests using a SPIRENT SR5500 dual channel emulator. The relationship between correlation coefficient between channels, receiver velocity and diversity gain is nvestigated. It is shown that transmit delay diversity significantly improves the quality of reception particularly in simulated fast fading mobile broadcasting applications. This paper documents research conducted by Brunel University and Broadreach Systems
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