• Journal of Broadcast Engineering
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• v.11 no.4 s.33
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• pp.521-532
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• 2006

Recently, many research initiatives have been underway to improve reception performance of ATSC based DTV signal in mobile channel by adopting multiple antennas. In this paper, we propose a new mobile channel model which can be applicable to any array geometry. And then we propose new channel estimation algorithm which uses PN5l1 sequence in field synch. The proposed algorithm is to estimate channel by correlating the input signal in If frequency band and finding maximum peak, which does not need complicated synchronization circuit. Finally, we propose new receiver structures which can be implemented at the front-end of the existing receiver with no modification. With computer simulation, we verify the performance of the proposed model and verify the performance of the receiver structure with computer simulation.

• ETRI Journal
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• v.36 no.2
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• pp.271-279
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• 2014

This paper proposes a new broadcasting system for the service-compatible 3DTV in which the 3D service can coexist with the conventional digital TV broadcast. In the proposed system, the commercial 3DTV service can be implemented via the existing DTV channel without utilizing the dedicated 3DTV system. This 2D/3D system interworks with the conventional system and can switch to 2D or 3D service according to the broadcast programming and schedule. The system also provides a mechanism that can prevent the synchronization mismatch between left and right video streams and between the stream and the associated signaling in the 2D/3D transition periods. The picture quality measurements are carried out based on the ITU-R recommended test to check the level of quality of service provided by the proposed scheme. The conformity tests are also performed with the conventional channel and the receiver for the DTV system to confirm the feasibility of the proposed one for the commercial service.

• Journal of the Korea Computer Industry Society
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• v.2 no.9
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• pp.1147-1154
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• 2001

In this paper, we make plans for facilities, the 8-VSB DTV transmission system, installed in the near future, based on presently NTSC TV operating it. First of all we estimate transmission power for analog NTSC, digital 8-VSB terrestrial broadcasting and the effective condition of optimal receiving power result from it. It's also to estimate optimal receiving condition by using Longley-Rice's Field Strength calculating method that is to guess a profile between transmitting station and many receiving points. The 8-VSB DTV Propagation aims to high-speed transmission rates of 19.39Mbps datum to enable HDTV(High Definition Television) at NTSC 6MHz bandwidth. First of all, an optimization of field strength between transmission station and receiver must deal with considerable. Because of these reasons, 8-VSB DTV transmission needs effective extension for NTSC TV service coverage. Finally we present the transmitting output that is expected in changing NTSC VHF to DTV UHF for maintaining the transmitting output of NTSC TV that is equal to 8-VSB DTV in service coverage.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.36 no.12A
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• pp.1024-1033
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• 2011

Stereoscopic video for 3DTV service is emerging as a main content of the Post-HD age in the multimedia industry, and also it starts a ripple effect to build infrastructure for 3DTV service throughout the related industries such as creating contents, consumer electronics and the broadcasting. Thus, "Technical Specification of Stereoscopic Video over MPEG-2 TS for 3DTV Service" for providing a standard for 3DTV broadcasting transmitter and receiver interface is under development by the 3DTV WG8061 in ITA, Korea. This paper provides verification of the functionalities, problems and future work of the above specification with designed test-bed. Through making a test bed, this paper try to verify not only the functionality of standard but also backward compatible for the present technology and abstract problems to would be reviewed and supplemented.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2010.11a
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• pp.36-39
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• 2010

본 논문에서는 DTV 방송 전환에 따른 주파수 이전 및 채널 재배치 시, 시스템 및 전파환경의 변화에 따라 수신 한계전계강도도출과 동등한 수준의 서비스 제공에 대한 기술적 분석 방법론을 제시한다. 전판환경 분석을 위한 전계강도 예측 모델은 ITU-R 권고 P.1546을 적용하였으며, 이를 기반으로 ATV 및 DTV의 수신한계전계강도 대한 수식을 정립하였다. 선정된 수신기의 특성에 대해 수치해석 및 결과를 고찰하였으며, 설정한 시스템에 대해 동등한 수준의 서비스 제공을 위한 시스템의 변수 보정도 방법도 제시하였다.

• Journal of Broadcast Engineering
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• v.13 no.5
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• pp.636-650
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• 2008

DTV has a great advantage as compared to Analog TV in picture quality under low reception field strength. Various high quality tuners have been developed to result in much smaller Noise Figure of the receivers and many trials for receiving DTV signal through indoor antenna. In this paper, results of intensive field tests on the indoor reception of DTV are presented. Tests were carried out around Seoul-Gyeonggi Metropolitan area. Commercial directional and omni-directional antennas and 5th generation receiver were used for reception availability tests. The effects of heights, locations, and types of the house as well as the distance to the transmitter on the reception performances are analyzed. Our test results will be applied to improve the indoor reception environment of DTV.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.17 no.4
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• pp.805-814
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• 2013

According to the shut-down of Analog TV service on 30th. December, 2012, UHF Digital Dividend Band (698~806MHz) could be used for Mobile service such as LTE(Long Term Evolution). In the condition that this band is allocated for LTE service, Interference evaluation between LTE and adjacent DTV service was carried out, using LTE-A system-level simulator which was developed for simulation of IMT-Advanced technology. If LTE service be commercialized in this band, this study proposes the coexistence condition through the interference evaluation such as the effects not only to DTV receiver from LTE terminal but also to LTE base station from DTV transmitter. It is expected that the coexistence condition by these studies will be applied to network algorism for IMT-Advanced system in this band.

• Journal of Broadcast Engineering
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• v.15 no.4
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• pp.555-562
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• 2010

After starting digital terrestrial broadcasting, there have been a number oftrials to provide new services like data broadcasting on a spare bandwidth of a DTV channel. Recently, the Push-VOD service, which provides A/V contents on that bandwidth, gets more attention and is being standardized as NRT(Non-Real-Time) by ATSC. However, it is highly probable that the contents transmitted in this way contain many errors due to the DTV receiving environment. Thus, in order to improve the reliability of transmission, the contents should be transmitted repeatedly several times, considering the unidirectional property of DTV terrestrial network. In this paper, we propose a method to calculate the optimal number of repetitions to transmit each contents in a way that minimizes the number of errors occured, when trying to transmit several contents to the receiver in a restricted time, using Markov-chain modeling and dynamic programming approach.

• Proceedings of the IEEK Conference
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• 2001.09a
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• pp.315-318
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• 2001

본 논문에서는 DTV 수상기에서 전송 받은 영상을 원하는 크기로 디스플레이 하기 위해 필요한 포맷 변환에 관한 알고리즘을 제시한다. 포맷 변환을 할 때에 영상을 보간하면 영상의 품질이 떨어지는 것을 볼 수 있는데 특히 에지 부분이 눈에 민감한 특성을 생각한다면 에지 부분에서의 무뎌짐은 상당한 문제점이 된다. 이를 해결하기 위해 고역 통과 필터링을 해주어 영상의 선명도를 올려줄 수 있는데 영상 전체에 고역 통과 필터링을 해주게 되면 영상의 에지뿐만 아니라 잡음 신호까지도 같이 증폭되는 문제점이 나타난다. 따라서 이를 해결하기 위해 에지 부분만을 적응적으로 고역 통과 필터에 통과시켜 잡음 성분은 줄이면서 에지 부분의 선명도는 올려주는 알고리즘을 제시하였다. 이를 검증하기 위해 다양한 영상에 대하여 컴퓨터 모의 실험을 하였고, 결과를 기존의 방법들과 비교하여 알고리즘의 우수성을 확인하였다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37C no.12
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• pp.1185-1194
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• 2012

This paper proposes a new terrestrial 3DTV broadcasting standard specification based on synchronization with non-real-time contents in order to overcome quality limitations of the current 3DTV services that are arisen from the limited bandwidth of the legacy broadcasting channel. In the services using the proposed specification, one view sequence of a stereoscopic video content is delivered as a non-real-time content in idle time, and the other view sequence is transmitted in real time broadcasting signal, thereafter two sequences are synchronized in a receiver for display. Thus, it is possible to provide higher-quality stereoscopic video content services than the current 3DTV services. In order to realize these services, a new mechanism is required which enables synchronization between the data that are from different transmission media and time. Therefore, this paper suggests a solution by multiplexing the synchronization signals of non-real-time contents into broadcasting signals with real-time streams together. This solution can provide a accurate synchronization mechanism by minimum updates of legacy broadcasting systems while maintaining compatibility with legacy services.