• Electronics and Telecommunications Trends
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• v.24 no.5
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• pp.143-151
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• 2009

3DTV 방송은 사실감과 현장감을 내포한 콘텐츠를 획득, 압축 및 전송을 통하여 시청자가 실감 인터페이스를 이용해 상호작용을 하면서 3차원 입체 콘텐츠를 자연스럽게 몰입하여 즐기도록 하는 차세대 방송기술로서 선진 각국에서는 이미 활발한 투자와 연구를 진행하고 있으며[1] 미국, 일본 등에서는 3D 영화, 3DTV 등 관련 서비스가 상용화되기 시작하였다. 본 고에서는 3DTV의 본격적인 서비스 도입을 위하여 필수적으로 요구되는 3DTV 방송기술 표준화 및 각국 방송서비스 현황을 살펴본다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2009.11a
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• pp.29-32
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• 2009

무선 방송 통신 시스템에서는 높은 전력신호를 송신하기 위하여 고전력 증폭기(HPA)를 사용한다. 그러나 고전력 증폭기는 비선형 왜곡 특성을 가지고 있으며 이는 송신 신호의 품질을 저하하는 요소로 작용한다. 비선형 왜곡특성을 극복하기 위하여 여러 가지 방법이 제안되었으며 이중 LUT를 사용하는 전치 왜곡기법과 다항식을 이용한 전치 왜곡기법이 많이 사용된다. 본 논문에서는 다항식을 이용한 전치 왜곡기에서 기존보다 작은 오차와 안정화된 역함수를 제안하고 모의실험을 통하여 기존 보다 개선된 성능을 얻을 수 있음을 보인다.

• Journal of The Institute of Information and Telecommunication Facilities Engineering
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• v.11 no.1
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• pp.10-15
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• 2012

Ultra wideband (UWB) technologies have been developed to exploit a new spectrum resource in substances and to realize ultra-high-speed communication, high precision geo-location, and other applications. The energy of UWB signal is extremely spread from near DC (Direct Current) to a few GHz. This means that the interference between conventional narrowband systems and UWB systems is inevitable. However, the interference effects had not previously been studied from UWB wireless systems to conventional wireless systems sharing the frequency bands such as broadcasting system. This paper experimentally evaluates the interference from two kinds of UWB sources, namely an orthogonal frequency division multiplex UWB source and an impulse radio UWB source, to a broadcasting transmission system. The S/N ratio degradation of broadcasting system is presented. From these experimental results, we show that in all practical cases UWB system can be coexisted 35m distance in-band broadcasting network.

• Journal of the Korean Society of Industry Convergence
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• v.14 no.4
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• pp.135-142
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• 2011

Convergence between telecom and broadcasting is today a worldwide phenomenon. Diverse services like VoD, mobile broadcasting, IPTV and interactive services have already made their market debut or are currently being commercialized. Regulatory systems are also being revised to appropriately regulate this new breed of services. We propose the new model of educational broadcasting system using the internet network, it is not different conventional coaxial cable methods. Especially, we design the multicast method of the network using the limited channel and resource, propose the method of intercommunication in the school between the broadcasting system and database system.

• Journal of electromagnetic engineering and science
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• v.6 no.1
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• pp.76-81
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• 2006

Ultra wideband(UWB) technologies have been developed to exploit a new spectrum resource in substances and to realize ultra-high-speed communication, high precision geo-location, and other applications. The energy of UWB signal is extremely spread from near DC to a few GHz. This means that the interference between conventional narrowband systems and UWB systems is inevitable. However, the interference effects had not previously been studied from UWB wireless systems to conventional wireless systems sharing the frequency bands such as Broadcasting system. This paper experimentally evaluates the interference from two kinds of UWB sources, namely a orthogonal frequency division Multiplex UWB source and an impulse radio UWB source, to a Broadcasting transmission system. The receive power degradations of broadcasting system are presented. From these experimental results, we show that in all practical cases UWB system can coexist 35 m distance in-band broadcasting network.

• The Journal of the Korea Contents Association
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• v.9 no.4
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• pp.172-180
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• 2009

This study considers some changes in the program production by the local broadcasting stations through the analysis of their programs. Currently, one of the biggest changes in the local broadcasting systems is that they focus on the self-produced contents about the community and expand the joint-production. In the case of KBS Daejeon, they try to activate various joint-produced programs together with the local broadcasting stations in Yeongnam province. MBC Daejeon has also strengthened the joint-production systems since 2002 by classifying MBC's 19 subsidiary stations around the country into 5 groups in order to strengthen the competitiveness. As for TJB, they work in the cooperation with other commercial broadcasting stations in other cities, including Busan, Kwangju, Jeonju, Ulsan, Daegu by sharing the programs which they produced. In conclusion, the local broadcasting systems should depart from the function as a mediating center of the central broadcasting network and strengthen the ability of producing programs in order to be able to function as a source of producing programs. Thus, local broadcasting stations should expand the joint production of the programs about the communities and the ratio of the organization of the self-produced programs.

• Electronics and Telecommunications Trends
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• v.25 no.1
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• pp.156-167
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• 2010

3D 영상 기술은 사용자에게 현실감과 몰입감을 극대화 해줄 수 있는 차세대 멀티미디어 시장의 핵심 기술로서 최근 3D 실험 방송 및 3D 영화 제작과 같은 상용화를 위한 시도가 진행되고 있다. 이러한 흐름과 맞물려 유럽에서는 차세대 멀티미디어 시장을 선점하기 위해 3D 영상의 획득, 처리, 전송, 디스플레이 등 여러 분야에 걸쳐 다양한 3D 관련 프로젝트를 진행하고 있으며 이를 통해 새로운 3D 기술 개발 및 표준화를 진행하고 있다. 본 고에서는 유럽의 3D 관련 프로젝트 현황과 최신 기술을 살펴본다.

• Journal of Broadcast Engineering
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• v.11 no.4 s.33
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• pp.458-470
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• 2006

This paper describes issues and consideration on authoring of interactive multi-view visual content based on MPEG-4. The issues include types of multi-view visual content; scene composition for rendering; functionalities for user-interaction; and multi-view visual content file format. The MPEG-4 standard, which aims to provide an object based audiovisual coding tool, has been developed to address the emerging needs from communications, interactive broadcasting as well as from mixed service models resulting from technological convergence. Due to the feature of object based coding, the use of MPEG-4 can resolve the format diversity problem of multi-view visual contents while providing high interactivity to users. Throughout this paper, we will present which issues need to be determined and how they can be realized by means of MPEG-4 Systems.

• ETRI Journal
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• v.33 no.2
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• pp.279-282
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• 2011

Coexistence analysis is extremely important in examining the possibility for spectrum sharing between orthogonal frequency-division multiplexing (OFDM)-based international mobile telecommunications (IMT)-Advanced and other wireless services. In this letter, a new closed form method is derived based on power spectral density analysis in order to analyze the coexistence of OFDM-based IMT-Advanced systems and broadcasting frequency modulation (FM) systems. The proposed method evaluates more exact interference power of IMT-Advanced systems in FM broadcasting systems than the advanced minimum coupling loss (A-MCL) method. Numerical results show that the interference power is 1.3 dB and 3 dB less than that obtained using the A-MCL method at cochannel and adjacent channel, respectively. This reduces the minimum separation distance between the two systems, which eventually saves spectrum resources.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.8 no.2
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• pp.601-617
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• 2014

In digital radio broadcasting systems, long delays are incurred in service start time when tuning to a particular frequency because several synchronization steps, such as symbol timing synchronization, frame synchronization, and carrier frequency offset and sampling frequency offset compensation are necessary. Therefore, the operation of the synchronization blocks causes delays ranging from several hundred milliseconds to a few seconds until the start of the radio service after frequency tuning. Furthermore, if spectrum inversed signals are transmitted in digital radio broadcasting systems, the receivers are unable to decode them, even though most receivers can demodulate the spectral inversed signals in analog radio broadcasting systems. Accordingly, fast synchronization techniques and a method for spectral inversion detection are required in digital radio broadcasting systems that are to replace the analog radio systems. This paper presents a joint detection method of frame, integer carrier frequency offset, and spectrum inversion for DRM Plus digital broadcasting systems. The proposed scheme can detect the frame and determine whether the signal is normal or spectral inversed without any carrier frequency offset and sampling frequency offset compensation, enabling fast frame synchronization. The proposed method shows outstanding performance in environments where symbol timing offsets and sampling frequency offsets exist.