Current Issue : April - June Volume : 2017 Issue Number : 2 Articles : 5 Articles
With the rapid development of the radio and TV industry and the implementation of INT (the integration of\ntelecommunications networks, cable TV networks and the Internet), the contents of programs and advertisements is\nshowing massive, live and interactive trends. In order to meet the security of radio and television, the broadcast of\ninformation have to be controlled and administered. In order to master the latest information of public opinion trends\nthrough radio and television network, it is necessary research the specific industry applications of broadcast program\nmonitoring. In this paper, the importance of broadcast monitoring in public opinion analysis is firstly analysed. The\nmonitoring radio and television programs broadcast system architecture is proposed combining with the practice,\nfocusing on the technical requirements and implementation process of program broadcast, advertisement broadcast\nand TV station broadcast monitoring. The more efficient information is generated through statistical analysis, which\nprovides data analysis for radio and television public opinion analysis....
Globally, terrestrial television (TV) broadcasting\nis in the midst of a complete transition to digital\nsignals. The last analog terrestrial broadcast is expected\nto be switched off in the early 2020s. This transition\npresents huge energy savings opportunities that have\nthus far been ignored. Digital TV switchovers have\nlikely increased energy consumption as countries have\ncompleted transitions by providing digital TV converters\nto analog TV users, which increase energy consumption\nand extend the life of energy-inefficient analog\nTVs. We find that if analog TVs were retired at the\ntime of a digital switchover and replaced with superefficient\nflat-panel TVs, such as light-emitting diode\n(LED) backlit liquid crystal display (LCD) TVs, there\nis a combined electricity savings potential of 32 terawatt\nhours [TWh] per year in countries that have not yet\ncompleted their digital TV transition. In view of these\nfindings as well as the dramatic drops of super-efficient\nTV prices and the unique early-retirement opportunity\nresulting from cessation of terrestrial analog broadcasts,\nTV-exchange programs would easily and substantially\nadvance energy efficiency....
Digital Radio Mondiale (DRM) is the universally, openly standardized digital broadcasting system for all frequencies\nincluding LW, MW, and SW as well as VHF bands. Alongside providing high audio quality to listeners, DRM satisfies\ntechnological requirements posed by broadcasters, manufacturers and regulatory authorities and thus bears a great\npotential for the future of global radio. One of the key issues here concerns green broadcasting. Facing the need for\nhigh-power transmitters to cover wide areas, there is room for improvement concerning the power efficiency of\nDRM-transmitters. A major drawback of DRM is its high peak-to-average power ratio (PAPR) due to the applied\ntransmission technology based on Orthogonal Frequency Division Multiplexing (OFDM), which results in\nnon-linearities in the emitted signal, low power efficiency, and high costs of transmitters. To overcome this, numerous\nschemes have been investigated for reducing PAPR in OFDM systems. In this paper, we review and analyze various\ntechnologies to reduce PAPR providing that the technical feasibility and DRM-specific system architecture and edge\nconditions regarding the system performance in terms of modulation error rate, compliance with frequency mask,\nand synchronization efficiency are ensured. All evaluations are carried out with I/Q signals which are monitored in real\noperation to present the actual performance of proposed PAPR techniques. Subsequently, the capability of the best\napproach is evaluated via measurements on a DRM test platform, where achieved transmit power gain of 10 dB is\nshown. According to our evaluation results, PAPR reduction schemes based on active constellation extension\nfollowed by a filter prove to be promising towards practical realization of power-efficient transmitters....
Digital technology has transformed the information flow and support infrastructure for numerous application domains, such\nas cellular communications. Cinematography, traditionally, a film based medium, has embraced digital technology leading to\ninnovative transformations in its work flow. Digital cinema supports transmission of high resolution content enabled by the\nlatest advancements in optical communications and video compression. In this paper we provide a survey of the optical network\ntechnologies for supporting this bandwidth intensive traffic class.We also highlight the significance and benefits of the state of the\nart in optical technologies that support the digital cinema work flow....
Cooperative broadcasting is a promising technique for robust broadcast with low overhead and delay in mobile ad hoc networks.\nThe technique is attractive for mission-oriented mobile communication, where a majority of the traffic is of broadcast nature.\nIn cooperative broadcasting, all nodes simultaneously retransmit packets. The receiver utilizes cooperative diversity in the\nsimultaneously received signals. The retransmissions continue until all nodes are reached. After the packet has traveled a specific\nnumber of hops out from the source, denoted as reuse distance, the source node transmits a new broadcast packet in the time slot\nused for the previous broadcast packet. If the reuse distance is too small, interference causes packet loss in intermediate nodes. In\nthe literature, a reuse distance of three is common. With an analysis based on a realistic interference model and real terrain data,\nwe show that a reuse distance of at least four is necessary to avoid packet loss in sparsely connected networks, especially for high\nspectral efficiencies. For frequency hopping, widely used in military systems, we propose a novel method. This method almost\neliminates interference for a reuse distance of three, increasing the throughput by 33% compared to systems with a reuse distance of four....
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