• Title, Summary, Keyword: Broadcasting Reception

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Equalization Digital On-Channel Repeater Part 2 : Field Test Results (등화형 디지털 동일 채널 중계기 Part 2 : 필드 테스트 결과)

  • Park Sung Ik;Lee Yong-Tae;Eum Homin;Seo Jae Hyun;Kim Heung Mook;Kim Seung Won;Lee Soo-In
    • Journal of Broadcast Engineering
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    • v.10 no.2
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    • pp.221-237
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    • 2005
  • This paper presents and analyzes field test results of Equalization Digital On-Channel Repeater (EDOCR) using ATSC(Advanced Television Systems Committee) terrestrial digital TV broadcasting system. In the field test, according to EDOCR On/Off, types of antennas and receivers we measured reception possibility, C/N(Carrier to Noise Ratio), reception power, noise and input margin at each test point. By the field test results, the reception rate of the receiver manufactured in 2004 was $33\%$ when EDOCR is off and directional antenna is used. However, the reception rate was $100\%$ when EDOCR is on. In addition, the noise margin, which determines reception quality was increased at least 6 dB, so that it is capable of constructing SFN(Single Frequency Network) using the EDOCR.

Distributed Translator Part 3: Field Test Results (분산 중계기 Part 3: 필드 테스트 결과)

  • Park, Sung-Ik;Seo, Jae-Hyun;Eum, Ho-Min;Lee, Yong-Hoon;Kim, Heung-Mook
    • Journal of Broadcast Engineering
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    • v.15 no.1
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    • pp.40-51
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    • 2010
  • This paper presents and analyzes field test results of distributed translator (DTxR) for distributed frequency network (DFN) in the ATSC (Advanced Television Systems Committee) terrestrial digital TV broadcasting system. In the field test, according to types of antennas and receivers in areas where are overlapped by two DTxRs' coverage, we measured reception power, noise margin reception possibility, and ease of reception at each test point. By the field test results, when two DTxRs are on, reception power and noise margin are increased than when one DTxR is on. However, reception rate and ease of reception are similar or increased according to types of receivers.

A Study on the Policy Issue of the Terrestrial UHD TV for Viewers -Concentrating on the Problem of the Direct Reception of Terrestrial Broadcasting- (시청자를 위한 지상파 UHD TV의 정책적 쟁점 연구 -지상파 직접수신 문제를 중심으로-)

  • Kim, Hee-Kyung
    • The Journal of the Korea Contents Association
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    • v.17 no.1
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    • pp.496-506
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    • 2017
  • This study tried to examine the validity of the technical and institutional method to perform the purpose of public interest in terrestrial broadcasting. For this purpose, this study concentrated to the rate of direct reception of the terrestrial broadcasting that government and broadcasting company have offered since the digital transition. Results of analysis, it appeared that have not possibility of realization to set the direct receiving antenna and built-in Antenna for enhanced reception of the signal of the terrestrial broadcasting. Second, the MMS, if not enhanced the direct reception, was expected that repeated the retransmission through the pay broadcasting as the time of digital transition. Finally, the disaster broadcast was revealed that reduce the effectiveness of the UHD TV policy because of the mutual interference between frequencies and the incomplete solution of shadow area. According to these results, it is expected to be difficult for a while to perform the purpose of public interest in UHD TV.

Efficient Estimation Method of Reception Rate for Terrestrial Digital TV Broadcasting Service (효율적인 지상파 디지털 TV방송 수신율 산정방안)

  • Kwon, Won-Hyun;Kim, Kwang-Ui
    • Journal of IKEEE
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    • v.16 no.1
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    • pp.7-14
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    • 2012
  • In this paper, a reception rate of terrestrial digital TV broadcasting service is analyzed and a novel method which can estimate the broadcasting coverage rate more objectively and reliably than the existing method is proposed. Previous method measures the reception rate by means of electric field intensity measurement or subjective video quality assessment. Because of limited measuring points, it inherently has measurement error and cannot consider the viewer's receiving conditions in real-time. In order to consider the viewer's population and receiving environment, morphology which characterizes the viewer's receiving environment is extracted using household census data of National Statistical Office and the land cover map of Ministry of Environment. Using the extracted geographical morphology, the reception rate of terrestrial digital TV broadcasting service is calculated with Spectrum Management Intelligence System (SMIs). Proposed method can calculate the reception rate more objectively and reliably than the existing methods because it fully considers the viewer's receiving environments in real-time.

A study on the microstrip array antenna for KOREASAT DBS reception (KOREASAT 위성방송 수신용 마이크로스트립 어레이 안테나에 관한 연구)

  • 전주성;이성열;이윤현
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.21 no.9
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    • pp.2514-2525
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    • 1996
  • This paper presents the possibility of the satellite broadcasting reception as a means of microstrip antenna of the planar structure. The paper discusses the design of the optimal KOREASAT DBS(Direct Broadcasting Satellite) reception microstrip antenna. Experimental results for ta 16*16 array antenna of size 35*35cm are also described. Itsgain is over 28dB in the frequency range of 11.7~12.0GHz DBS band. The measured NHK broadcasting C/N ratio of 16816 array antenna is over 10dB in Pusan. It is expected that good picture quality of C/N .GEQ. 12dB can be obtained for domestic use if this microstrip antenna is used in KOREASAT broadcasting receiving system.

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A Study on Performance Improvement of CMMB Receiver to Reduce an Adjacent Channel Interference (인접 채널 간섭 제거를 통한 CMMB 수신기의 성능 향상에 관한 연구)

  • Yu, Yeong-Cheol
    • Journal of Korea Multimedia Society
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    • v.15 no.3
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    • pp.364-371
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    • 2012
  • Currently, CMMB(China Mobile Multimedia Broadcasting) and the conventional analog TV broadcasting have transmitted by using UHF(Ultra High Frequency : 474MHz~754MHz) band. Normally, the transmission power of the digital TV broadcasting is lower than the conventional analog TV broadcasting to protect the reception quality of the conventional analog TV broadcasting. The reception sensitivity of CMMB receiver has severely deteriorated due to adjacent the conventional analog TV broadcasting signals which called ACI (Adjacent Channel Interference). To improve the reception sensitivity of a CMMB receiver on ACI environment, this paper proposed a simple method which is tuning a cut off frequency of LPF (Low Pass Filter). From the experiment, the reception sensitivity of CMMB receiver was improved as 11.3dB.

Effective BER Measurement System for Terrestrial DMB (지상파 DMB를 위한 효율적인 비트오류율 측정시스템)

  • 김상훈;임중곤;김만식;이종화
    • Journal of Broadcast Engineering
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    • v.8 no.3
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    • pp.250-258
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    • 2003
  • Recently, the transition from conventional analog broadcasting to digital broadcasting has been proceeding as a result of the advance in digital multimedia broadcasting technique. In radio broadcasting, Eureka-147 DAB(Digital Audio Broadcasting) was decided as the standard system of digital radio broadcasting in Korea. In addition to CD quality audio, a variety of data services and excellent performance in mobile reception can be served by DAB, and DAB was evolved into DMB(Digital Multimedia Broadcasting) in Korea for the purpose of emphasizing moving picture multimedia service by DAB. In case of digital broadcasting, it is absolutely essential to measure the BER(Bit Error Rate) in the received signal in order to evaluate the coverage obtained by a transmitter and the quality of the received signal. In this paper, we propose efficient subchannel data structure and BER measurement algorithm. and then verify it by laboratory experiments. With a proposed method, the synchronization for BER measurement is easily obtained and especially the exact results can be obtained by classifying the lost bits which are included in the reception-failed CIFs(Common Interleaved Frame) into errors. This makes the proposed BER measurement system especially appropriate to DMB in which the frequent changes in channel status caused by mobile reception environment exist.

Enhanced-xVSB Development for Next Generation Terrestrial DTV Transmission System (차세대 지상파 DTV 전송방식 시스템을 위한 Enhanced-xVSB 개발)

  • Kim Sung-Hoon;Ji Kum-Ran;Lee Jae-Youn;Kim Seung-Won;Lee Soo-In;Kim Chang-Joong;Lee Ho-Kyoung
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • pp.281-284
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    • 2004
  • This paper described an Enhanced-xVSB system for improving mobile/pedestrian reception performance to the ATSC DTV 8-VSB transmission standard. E-xVSB system can transmit a mixture of normal (8-VSB) stream and enhanced (robust) stream. The robust stream has a higher threshold of visibility (TOV) compared to the standard stream, and legacy receivers ignore the robust packets. Thus, Enhanced-xVSB system is fully backward compatible with a current ATSC standard. for mobile and portable reception support, E-xVSB system adopts a reduced constellation method as well as enhanced trellis-coded modulation scheme. E-xVSB system supports a variety of enhanced modulation schemes: Pseudo-2VSB, Enhanced-4VSB, modified Enhanced-8VSB and Hybrid-VSB. Proposed E-xVSB system performs well under serious dynamic multipath reception environment.

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A Study on 700MHz Spectrum Utilization for the Improvement of Terrestrial Signal Reception and Next Generation Broadcasting (지상파방송 직접수신 환경 개선과 차세대방송을 위한 700MHz대역 주파수 활용 연구)

  • Park, Sung-Kyu;Lee, Chang-Hyung;Park, Goo-Man
    • Journal of Broadcast Engineering
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    • v.17 no.2
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    • pp.237-251
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    • 2012
  • Recently, the direct terrestrial broadcasting reception has been reduced rapidly and not been improved even in digital broadcast environment. The distribution plan of 700MHz frequency band(Ch.52~69) will make the problem worse because the spectrum might be allocated to mobile communication use. In this paper, we investigated the efficient frequency usage for DTV signal reception improvement and next generation broadcasting. The frequency amount required for reception improvement and for next generation broadcasting service is presented. We estimated the beneficial effect when the spectrum(108MHz Frequency Width) is used for SFN transmission technology, UHDTV and Full-HD 3DTV.

A Study on Users' Perception on the Reallocation of 700MHz Spectrum After Digital Transition of Terrestrial Broadcasting (지상파 방송의 디지털 전환 완료 이후 700MHz대역 주파수 재배치에 대한 이용자 인식 연구)

  • Lee, Yeong-Ju;Park, Sung-Kyu;Choi, Seong-Jin
    • Journal of Broadcast Engineering
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    • v.17 no.6
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    • pp.1080-1090
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    • 2012
  • This study investigates the users' preference of frequency reallocation and frequency auction after digital transition of terrestrial broadcasting and it focuses on the relationships between media using pattern, reception environment of broadcasting telecommunication, and expectation for the universal service and requirement for the public interest. The results show that the longer DMB viewing hours, people prefer to frequency allocation for the telecommunication side. The technical aspects such as perception on the reception environment of broadcasting don't make effect on the users' preference of frequency allocation. In addition, the more people think the universal service of terrestrial broadcasting important, the more people think it unnecessary to adopt auction system to the broadcasting frequency. These results give implication that it is the most basic condition to improve the reception environment in order to accomplish universal service duty of terrestrial broadcasting.