• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2014년도 추계학술대회
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• pp.159-160
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• 2014

본 논문에서는 지상파 디지털 TV(DTV) 방송 수신용 광대역 평면 안테나 설계방법에 대해 연구하였다. 제안된 구조는 직사각형 도체 패치 내부에 t자형 비대칭 슬릿을 삽입하여 평면 다이폴을 구성한 것이고 안테나 형상은 FR4 기판의 한 면에 인쇄된다. 여러 가지 파라미터 값들이 안테나의 특성에 미치는 영향을 관찰하고 DTV 대역(470-806 MHz)에서의 동작에 적합하도록 조정하였다. FR4 기판에 $260mm{\times}30mm$ 크기로 제작된 안테나의 특성을 실험하여 연구결과의 타당성을 검증하였다.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2009년도 춘계학술대회
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• pp.525-528
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• 2009

본 논문은 신규 방송통신서비스인 IPTV(Internet Protocol Television)가 기존의 TV서비스와 차별화를 두고 향후 통신산업의 성장 동력으로서 성공적으로 성장할 수 있는지를 살펴보고자 한다. 먼저, 기존에 국내에서 상용화된 신규 방송통신서비스 - WiBro 및 위성 지상파 DMB - 주요 현황을 살펴보고, 신규 방송통신서비스 위치지도(Position Map of Emerging Telecommunications Services) 분석을 포함한 신규 방송통신서비스의 성장가능성을 분석하기 위한 개념 틀을 제시한다. 이를 바탕으로 기존 신규 방송통신서비스의 성공 장애 요인을 도출하고, IPTV 서비스의 향후 성장가능성을 분석한다. 마지막으로 향후 IPTV 서비스 시장의 성공적인 성장을 위한 정책적 시사점을 제시한다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 제13회 신호처리 합동 학술대회 논문집
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• pp.229-232
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• 2000

Orthogonal frequency division multiplexing(OFDM) has meanwhile become part of several telecommunicati ons standards, such as satellite and terrestrial digital audio broadcasting(DAB), digital terrestrial TV broad casting(DVB), asymmetric digital subscriber line(ADSL) for high-bit-rate digital subscriber services on twisted-pair channels, and broadband indoor wireless systems. In his paper, we show that OFDM signals contain sufficient structure to accomplish blind channel estimation using second order statistics only. This method doesn't require redundancy as cp in transmitter. And the result is compared with PSAM channel estimation as least square, linear minimum mean square, singular value decomposition.

• 한국멀티미디어학회논문지
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• 제19권5호
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• pp.856-864
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• 2016

Recently, HD transmission was commonplace in the case of the terrestrial broadcasting, furthermore, 4k UHD broadcasts are also being pilot and such as HD contents are common even in smart-phones. Like this, through both the content and audience are in the situation to take advantage of the HD mobile TV, only QVGA video contents are being transmitted in the terrestrial DMB broadcasting. In this paper, introduction plan of HD DMB service for activation of DMB industry will be described in terms of technical, institutional, and policy to overcome the limitations of such as DMB broadcasting. Due to the introduction of HD DMB, high quality contents will be provided to audience and the advertising revenue DMB broadcasters increased so that the market share of DMB in mobile broadcasting be recovered.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 학술대회 논문집 정보 및 제어부문
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• pp.258-260
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• 2005

With the start of terrestrial digital broadcast, we can view HD digital contents in TV. Also we can record, play, redistribute digital contents over the various way. Therefore the protection of Digital Contents Right became the important issue. In this paper, we implement a manager that prevents indiscriminate digital contents redistribution of the terrestrial digital broadcast contents. For protection of Digital contents Right, we use BF(Broadcast Flag) that we can control viewing or copy digital contents with.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2008년도 하계종합학술대회
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• pp.9-11
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• 2008

In this paper, we describe a 1/4 rate robust modulation algorithm for Enhanced-xVSB system which is fully backward compatible with ATSC 8-VSB standard. Laboratory test results of proposed Enhanced-xVSB 1/4 rate mode is shown a significantly improved reception performance under multipath as well as AWGN channel. We suggest an Enhanced-xVSB terrestrial broadcasting system for in-band Pedestrian/Portable TV broadcasting service.

• 기술혁신학회지
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• 제8권3호
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• pp.911-931
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• 2005

This paper analyzes the demand characteristics of DMB services using survey data. According to a Logit analysis, the willingness to adopt the services is higher if the would-be user is male, is better informed with the service, is watching TV longer, and is spending more for the telecommunications services. And the survey results tell us that for the stimulation of the service, efforts should be made to increase the level of public awareness of the services. The survey response from the would-be DMB users shows that the respondents who value the nationwide coverage and the numbers of channel are more inclined to use the satellite DMB service. On the other hand, the service charge and the availability of the terrestrial broadcasting channel for the time being does not seem to influence the intention of using the terrestrial DMB service. It could be interpreted that the potential user are deciding whether to use the service more by the quality and contents of the service rather than by the cost of the service.

• ETRI Journal
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• 제28권5호
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• pp.664-667
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• 2006

We propose an efficient audio transcoding algorithm that can convert audio streams from terrestrial digital television broadcasting service stations to those for terrestrial digital multimedia broadcasting hand-held receivers. The proposed algorithm avoids the complicated psychoacoustic analysis by calculating the scalefactors of the bit-sliced arithmetic coding encoder directly from the signal-to-noise ratio parameters of the AC-3 decoder. The bit-allocation process is also simplified by cascading the nested distortion control loop. Through subjective evaluation, it is shown that the proposed algorithm provides comparable audio quality to tandem coding but it requires much smaller complexity.

• 한국통신학회논문지
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• 제21권7호
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• pp.1777-1786
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• 1996

This paper describes theories and implementation techniques of a digital high-definition television(HDTV) modem based on 32-QAM for terrestrial broadcasting. We proposed a digital demodulation scheme and a symbol timing recovery structure based on the band edge component maximization(BECM) method. The adaptive equalizer has 256 complex taps to remove the multipath of delays ranging from -2.mu.s~+24.mu.s with a new T/2-spaced blind equalization algorithm. computer simulation results reveal that the proposed algorithm outperforms other conventional blind equalization algorithm a digital HDTV modem with 4.91MHz symobol rate is implemented by utilizing the proposed algorithms. All processings for modem operations such as demodulation, estimation of symbol timing phase error, adaptive equalization, and carrier recovery except IF signal processing and sampling phase control part of the AD converter are done in digital domain. Especially, the carrier recovery loop can track a carrier offset of upto .+-.350KHz.

• 전자통신동향분석
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• 제35권1호
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• pp.1-11
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• 2020

The Korean domestic media environment is seeing a rapid and dynamic change. Consumer media behavior is shifting from TV to smartphones, and from traditional media, such as terrestrial TV and cable, to intelligent Internet-based media, such as OTT channels and social media. This affects the profit structure of each media company and the competition among them, furthermore, the competitiveness of media services. In this regard, we propose a domestic UHD activation plan after evaluating the competitiveness of each media based on the analysis of the changes in the domestic media environment and the status of UHD services.