• Title/Summary/Keyword: broadcasting channel

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A Study on the Actualizing the Public Interest of the Agricultural Broadcasting Channel in the Multi-Channel Age (다채널시대 농업전문방송채널에서의 공익성 실현 탐색 연구)

  • Rho, Gwang-June;Kim, Sung-Soo
    • Journal of Agricultural Extension & Community Development
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    • v.10 no.2
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    • pp.229-237
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    • 2003
  • Since the 1960s in Korea, major broadcasting channels broadcasted farm television programs, however, airing of these programs were reduced in the 1990s. This was due to the declining number of farmers, and the low popularity rating of farm television programs. To cope with the situation, agriculture businessmen, farmers, and the officials concerned tried to acquire the independent farming television channel in cable television and satellite television, In 1998, one cable television channel started broadcasting, while another channel in satellite television began its broadcasting in 2001. One of the major concerns of the people in the broadcasting was actualization of the public interests in the new media multi-channel age. Recognizing this point, the study explored a few areas of concern such as conceptualizations of the public interest of the people in the digital age, examination of the surroundings of program production and marketing, and survey the media use behavior of target audience - rural residents; In the concept of the public interest, there are two points of view; market focused and democratic principle oriented. As the digitalization of broadcast advances and the logic of economics prevails, it is difficult to offer the public broadcasting service to farmers, however, democratic principles should be more emphasized. The rural resident prefer major terrestrial television channel to cable television and satellite television channel, and in media use behavior, the medium of major terrestrial television would be more useful for farm broadcasting.

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Novel Equalization On-Channel Repeater with Feedback Interference Canceller in Terrestrial Digital Multimedia Broadcasting System

  • Park, Sung-Ik;Eum, Ho-Min;Park, So-Ra;Kim, Geon;Lee, Yong-Tae;Kim, Heung-Mook;Oh, Wang-Rok
    • ETRI Journal
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    • v.31 no.4
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    • pp.357-364
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    • 2009
  • In this paper, we propose a novel equalization on-channel repeater (OCR) with a feedback interference canceller (FIC) to relay terrestrial digital multimedia broadcasting signals in single frequency networks. The proposed OCR not only has high output power by cancelling the feedback signals caused by insufficient antenna isolation through the FIC, but also shows better output signal quality than the conventional OCR by removing multipath signals existing between the main transmitter and the OCR through an equalizer. In addition, computer simulations and laboratory test results demonstrate that the proposed OCR successfully cancels feedback signals and compensates channel distortions and provides a higher quality transmitting signal with higher output power than conventional OCRs.

Development of Interactive Data Broadcasting System Compliant with ATSC Standards

  • Jeong, Jong-Myeon;Lee, Yong-Ju;Park, Min-Sik;Choi, Ji-Hoon;Choi, Jin-Soo;Kim, Jin-Woong
    • ETRI Journal
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    • v.26 no.2
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    • pp.149-160
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    • 2004
  • In this paper, we present an interactive data broadcasting system compliant with the Advanced Television Systems Committee (ATSC) standards. The proposed system provides users not only with various data broadcasting services but also remote interactive services. For various data broadcasting services, we have adopted a synchronized data injector that calculates the transmission time of synchronized data accurately and multiplexes synchronized data with the data of an MPEG-2 audio-visual program according to the calculated transmission time. To support remote interactive services, we designed and implemented a return channel server connected on a bi-directional interaction channel. Test results show that the proposed system provides both an asynchronous and synchronized data broadcasting service and remote interactive service appropriately.

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Channel Correlation Analysis using MIMO Channel Measurement Parameters at Domestic 700MHz band (국내 700 MHz 대역에서 MIMO 채널 측정 파라미터를 이용한 채널 상관도 분석)

  • Jung, Myoung-Won;Chong, Young-Jun;Pack, Jeong-Ki
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.13 no.4
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    • pp.1-7
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    • 2013
  • In the next generation of mobile communication systems, high data rates and high capacity will be possible if multiple antennas are used at new frequencies. This paper presents the correlations between channel parameter path loss (PL), delay spread (DS), angular spread (AS) and K-factor established based on channel measurements. To avoid interference from Korean DTV broadcasting, we measured the channel characteristics in urban/rural/suburban areas on Jeju Island using a channel sounder and $4{\times}4$ antennas. The correlations between channel parameter show that the wireless channel characteristics can be determined and effective communication system design can be produced for use in similar environments.

Transmission Performance Analysis on Digital Multimedia Broadcasting System (이동멀티미디어방송 시스템의 전송성능 분석)

  • Lee, Hyun;Park, So-Ra;Yang, Kyu-Tea;Hamn, Young-Kwon;Lee, Soo-In
    • Journal of Broadcast Engineering
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    • v.8 no.3
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    • pp.228-237
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    • 2003
  • Eureka-147 DAB(Digital Audio Broadcasting) system on which DMB(Digital Multimedia Broadcasting) system is based, was designed for the requirements of CD qualify audio with ${10}^{-4}$ bit error rate. Audio program may be primary service in DAB system, but multimedia program can be primary service in DMB system. Therefore, the bit error rate required must be below ${10}^{-7}$${10}^{-8}$ to transmit multimedia data via DMB channel. In order to meet the requirements and keep backward compatibility of DAB system we propose an outer channel coding scheme using Reed-Solomon coding and convolutional interleaving. This paper shows the simulation results for DMB channel performance based on mobile channel model. Also, it describes the needs and the effects of the outer channel coding.

Channel Estimation in E-OCR for T-DMB System (T-DMB 시스템을 위한 E-OCR에서의 채널추정)

  • Park, Sung-Ik;Lim, Hyoung-Soo;Kim, Heung-Mook;Oh, Wang-Rok
    • Journal of Broadcast Engineering
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    • v.13 no.5
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    • pp.565-573
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    • 2008
  • This paper proposes noise reduction methods to improve the channel estimation performance in Equalization On-Channel Repeater (E-OCR) for Terrestrial-Digital Multimedia Broadcasting (T-DMB) system. In the E-OCR for T-DMB system, the channel estimation is performed by the pilot signal extraction and the channel coefficient estimation. Since the performance of the channel estimation highly depends on the estimated channel coefficients whose accuracy is associated with the received signal-to-noise ratio (SNR), it is important to reduce noise existing at the estimated channel coefficients. To reduce such noise components, various noise reduction methods of the estimated channel coefficients based on the M -point weighted moving average are proposed. Computer simulations show that the proposed methods improve the estimation performance by more than 2 to 3 dB in terms of the symbol error rate after equalization.

Enhanced Analysis Method of MIMO Channel Characteristics with Antenna Correlation at 781MHz (781MHz 대역에서 안테나 상관도를 고려한 개선된 MIMO 채널 특성 분석 방법)

  • Jung, Myoung-Won;Chong, Young-Jun;Pack, Jeong-Ki
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.13 no.3
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    • pp.17-24
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    • 2013
  • In this paper, the measurement data is analyzed and channel characteristics are derived through MIMO Channel measurements at 781MHz considering antenna correlation. 781MHz frequency band currently operates the DTV system, however, it will be allocated new mobile communication frequency band. The channel characteristics at 781MHz seem to be similar existing mobile communication system at 900MHz but quite a different part of the existing research has demonstrated. In addition, the signal procedure of the channel characteristics, considering the correlation of the antenna, for a more accurate prediction research is needed. To avoid interference with Korean DTV broadcasting, we measured channel characteristics in urban areas of Jeju island by channel sounder and $4{\times}4$ antenna. Channel characteristics with antenna correlation were derived based on the measured data in the urban area.

Analysis on Protection Ratio of IBAC DAB System for Co-Channel FM Interferer (동일채널 FM 간섭원에 대한 IBAC DAB 시스템의 혼신 보호비 분석)

  • Jeong, Young-Ho;Park, So-Ra;Kim, Geon;Lee, Hyun;Lee, Soo-In
    • Journal of Broadcast Engineering
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    • v.5 no.2
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    • pp.199-210
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    • 2000
  • The IBAC (In-Band Adjacent-Channel) DAB (Digital Audio Broadcasting) system is to provide multichannel CD quality audio services and multimedia data services including text and picture in FM band (88~105 MHz). As the FM band is being used by the existing analog radio broadcasting, there must he an analysis of the interference effect between IBAC DAB and analog FM signal. Therefore, the protection ratio should be evaluated to verify the system compatibility and allocate the new IBAC DAB channel in FM band. In this paper, among the three types of interferences, FM-to-DAB, DAB-to-FM and DAB-to-DAB, that can be occurred, the Protection ratio of IBAC DAB system for co-channel FM interferer is analyzed by modeling the FM interferer and considering the multipath fading channel. The simulation results show that IBAC DAB system has far better sensitivity than Eureka 147 and needs a relatively high protection ratio for co-channel FM interferer, because of its narrow bandwidth, about one third of that of Eureka 147.

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Transmission Method and Simulator Development with Channel bonding for a Mass Broadcasting Service in HFC Networks (HFC 망에서 대용량 방송서비스를 위한 채널 결합 기반 전송 방식 및 시뮬레이터 개발)

  • Shin, Hyun-Chul;Lee, Dong-Yul;You, Woong-Shik;Choi, Dong-Joon;Lee, Chae-Woo
    • Journal of Broadcast Engineering
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    • v.16 no.5
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    • pp.834-845
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    • 2011
  • Massive broadcasting contents such as UHD(Ultra High Definition) TV which requires multi-channel capacity for transmission has been introduced in recent years. A transmission scheme with channel bonding has been considered for transmission of massive broadcasting contents. In HFC(Hybrid Fiber Coaxial) networks, DOCSIS 3.0(Data Over Cable Service Interface Specification 3.0) has already applied channel bonding schemes for up/downstream of data service. A method unlike DOCSIS 3.0 is required to introduce a channel bonding scheme in the broadcasting service having unidirectional transmission with a downstream. Since a massive broadcasting content requires several channels for transmission, VBR(Variable Bit Rate) transmission has been emerging for the bandwidth efficiency. In addition, research on channel allocation and resource scheduling is required to guarantee QoS(Quality of Service) for the broadcasting service based on VBR. In this paper, we propose a transmission method for mass broadcasting service in HFC network and show the UHD transmission simulator developed to evaluate the performance. In order to evaluate the performance, we define various scenarios. Using the simulator, we assess the possibility of channel bonding and VBR transmission for UHD broadcasting system to provide mass broadcasting service efficiently. The developed simulator is expected to contribute to the efficient transmission system development of mass broadcasting service.

Multi-channel Audio Service in a Terrestrial-DMB System Using VSLI-Based Spatial Audio Coding

  • Seo, Jeong-Il;Moon, Han-Gil;Beack, Seung-Kwon;Kang, Kyeong-Ok;Hong, Jae-Keun
    • ETRI Journal
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    • v.27 no.5
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    • pp.635-638
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    • 2005
  • Spatial audio coding (SAC) is an extremely high compact representation of encoded multi-channel audio material. This paper suggests a multi-channel audio service in the terrestrial digital multimedia broadcasting (T-DMB) system using a novel SAC tool, which is called a virtual source location information (VSLI)-based SAC tool. Intensive experiments are presented to evaluate the validity of the proposed VSLI-based SAC tool, and prototypical systems are also presented to demonstrate the reliability of the proposed multi-channel T-DMB system in real applications.

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