• Title/Summary/Keyword: Advanced television systems committee

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A Novel Data Transmission Scheme for ATSC Terrestrial DTV Systems

  • Park, Sung-Ik;Kim, Heung-Mook;Oh, Wang-Rok;Kim, Jeong-Chang
    • ETRI Journal
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    • v.34 no.2
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    • pp.168-174
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    • 2012
  • In Advanced Television Systems Committee (ATSC) terrestrial digital television (DTV) systems, additional very low-rate data can be transmitted by modulating the amplitude and polarity of the transmitter identification (TxID) signal. Although the additional data transmission scheme offers reliable transmission and has a very large coverage area, it has a limitation on the data rate. In this paper, we propose a novel additional data transmission scheme based on the TxID sequences of the ATSC DTV system and Walsh modulation. The proposed scheme not only increases the data rate significantly, but also offers a virtually identical coverage area compared to a conventional scheme.

Additional Data Transmission Scheme Using TxID Signal for ATSC System (ATSC 지상파 DTV 시스템에서 TxID를 이용한 부가데이터 전송 기법)

  • Kang, Dong-Hoon;Park, Sung-Ik;Kim, Heung-Mook;Oh, Wang-Rok
    • Journal of Broadcast Engineering
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    • v.16 no.1
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    • pp.64-72
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    • 2011
  • In a Single Frequency Network (SFN) for Advanced Television Systems Committee (ATSC) terrestrial digital television (DTV) system, the interferences induced by the multiple transmitters and/or repeaters using same frequency are unavoidable. To ease the interference handing in the SFN for ATSC DTV system, transmitter identification (TxID) signal is recommended in the ATSC terrestrial DTV system. The TxID signal is embedded in the ATSC DTV signal and transmitted from each transmitter and repeater within the SFN and in ATSC recommended practice (RP) A/111, Kasami sequence is recommended as the TxID signal. In this paper, we propose an additional data transmission scheme using the TxID signal. In the proposed scheme, the Kasami sequence not only acts as the conventional TxID of the SFN for ATSC terrestrial DTV system but also carriers the additional data bits on its polarity and the code phase.

A Study of RF Watermark Backward Compatibility under Various Channel Environments (다양한 채널환경 하에서의 RF 워터마크 역호환성 연구)

  • Kim, Jeong-Chang;Park, Sung-Ik;Choi, Dae-Won;Lim, Hyoung-Soo;Kim, Heung-Mook
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.47 no.8
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    • pp.99-107
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    • 2010
  • In a single frequency network (SFN) for Advanced Television Systems Committee (ATSC) terrestrial digital television (DTV) system, the interferences induced by the multiple transmitters and/or repeaters using the same frequency are inevitable. Since the presence of interferences results in performance degradation of the SFN, it is crucial to manipulate the interferences by adjusting the transmit power and timing of each transmitter and repeater. In the ATSC terrestrial DTV system, in order to facilitate the interference manipulation process, a transmitter identification (TxID) signal which is uniquely embedded in the signal to be transmitted from each transmitter and repeater is recommended. Even though the injection level of the TxID signal is much lower than the DTV signal, the TxID signal injection infects the DTV signal. Hence, the effect of the TxID signal on the DTV signal must be investigated before deployment. In this paper, the effect of the TxID signal on the performance of legacy DTV receivers under additive white Gaussian noise and multipath channel environments is investigated not only with computer simulation but also with laboratory and field tests. The test results show that the average threshold of visibility degradation of the legacy DTV receivers due to the TxID signal injection is less than 0.2 dB at the TxID injection level of -30 dB.

Design of an Emergency Wake-up Alert System Utilizing Digital Television Guard Band

  • Ryu, Kwanwoong;Lee, You-Seok;Seo, Jae-Hyun;Kim, Heung Mook
    • ETRI Journal
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    • v.38 no.5
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    • pp.799-806
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    • 2016
  • In this paper, we propose an emergency wake-up alert system (EWAS) for providing accurate and rapid emergency information. The proposed system can provide an emergency wake-up alert service without an additional frequency allotment by utilizing the guard band of the Advanced Television Systems Committee (ATSC) Terrestrial Digital Television (DTV) system. The design target of the proposed system is to match the indoor reception coverage of EWAS with the outdoor reception coverage of the ATSC DTV system. To achieve this, the proposed system should be about 35.65 dB more robust than the ATSC DTV system. The simulation results show that the proposed system offers an emergency wake-up alert service supporting a data rate of up to 23 bps.

Study on the technology of ATSC terrestrial DTV broadcasting service using single frequency networks (단일 주파수 망을 이용한 ATSC 지상파 디지털 TV 방송서비스 기술 연구)

  • 박성익;이용태;김승원;이수인
    • Journal of Broadcast Engineering
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    • v.8 no.2
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    • pp.109-115
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    • 2003
  • In this paper we propose an efficient method to broadcast digital television signals using Single Frequency Networks (SFNs) in the Advanced Television Systems Committee (ATSC) transmission systems. Since the proposed schemes to synchronize multiple transmitters minimize the changes from the conventional ATSC system, the hardware complexity for the changes is very low. Our simulation results show that the proposed scheme makes less than 0.1 dB degradation at the threshold of visibility (TOV: BER= 3$\times$$10^{-6}$) in the additive white Gaussian noise (AWGN) channel. It is possible to reduce the performance degradation by increasing an initialization period of the proposed scheme.

Design parameter analysis for ATSC 1.0 single frequency networks based on receiver multipath handling performance

  • Hernandez-Flores, Mario A.;Galeano-Torres, Rodrigo;Garcia-Castillo, Miguel A.;Landeros-Ayala, Salvador;Matias-Maruri, Jose M.
    • ETRI Journal
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    • v.43 no.4
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    • pp.702-716
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    • 2021
  • This work proposes suitable network configurations for single frequency networks (SFNs) with ATSC 1.0 based on network coverage calculations and the laboratory multipath handling performance of commercial receivers. SFNs are widely used for delivering terrestrial digital television services because of their efficient use of the spectrum. In Mexico the analogue television transmissions switch-off occurred on 31 December 2016. Thus it is expected the adopted ATSC 1.0 system will be in force for the next several years despite the recent standardization of the ATSC 3.0 system. As ATSC 1.0 uses 8-VSB modulation the multipath handling capability of receivers is critical for the design of SFNs. The presented network planning results help develop technical normativity for implementing SFNs in Mexico and other countries that use ATSC 1.0. SFNs with transmitter separation up to 130 km are fully covered for outdoor reception mainly due to the directivity of the receiving antenna. Moreover for indoor reception at least 70% of an SFN coverage area can be achieved with a transmitter separation of up to 60 km depending on the radiated power and the transmitter antenna height.

Sparse Adaptive Equalizer for ATSC DTV in Fast Fading Channels (고속페이딩 채널 극복을 위한 ATSC DTV용 스파스 적응 등화기)

  • Heo No-Ik;Oh Hae-Sock;Han Dong Seog
    • Journal of Broadcast Engineering
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    • v.10 no.1 s.26
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    • pp.4-13
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    • 2005
  • An equalization algorithm is proposed to guarantee a stable performance in fast fading channels for digital television (DTV) systems from the advanced television system committee (ATSC) standard. In channels with high Doppler shifts, the conventional equalization algorithm shows severe performance degradation. Although the conventional equalizer compensates poor channel conditions to some degree, long filter taps required to overcome long delay profiles are not suitable for fast fading channels. The Proposed sparse equalization algorithm is robust to the multipaths with long delay Profiles as well as fast fading by utilizing channel estimation and equalizer initialization. It can compensate fast fading channels with high Doppler shifts using a filter tap selection technique as well as variable step-sizes. Under the ATSC test channels, the proposed algorithm is analyzed and compared with the conventional equalizer. Although the proposed algorithm uses small number of filter taps compared to the conventional equalizer, it is stable and has the advantages of fast convergence and channel tracking.

A Carrier Frequency Synchronization Scheme for modified ATSC Systems (수정된 ATSC 전송 시스템을 위한 반송파 주파수 동기부 설계에 관한 연구)

  • Jeon, Young-Gon;Kim, Joon-Tae
    • Journal of Broadcast Engineering
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    • v.16 no.1
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    • pp.96-107
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    • 2011
  • Recently, studies of 3D HDTV broadcasting technology have been processed actively. Korea is making efforts to modify Advanced Television Systems Committee (ATSC) 8-Vestigial Side Band (8-VSB) systems for terrestrial 3D HDTV broadcasting services. We intend to adopt a new frame structure to use PN (Pseudo-Noise) sequence as frame header, and VSB modulation. PN sequence is used to recover carrier freqeuncy offset, carrier phase error. In this paper, we will describe this system as the modified ATSC systems. The receiver of the modified ATSC system should be able to estimate and recover carrier frequency offset exactly. A existing ATSC systems inserts pilot to recover carrier frequency offset, on the other hand the modified ATSC systems use PN sequence to recovery carrier frequency offset without the use of pilot. In this paper, we introduce carrier frequency recovery (CFR) scheme for the modified ATSC systems. The proposed CFR scheme is composed of coarse CFR scheme using Fitz algorithm and fine CFR scheme using a simple PN sequence correlation algorithm. And, the symbol information of QAM modulated signal is contained in both In-phase (I)channel and Quadrature-phase (Q)channel. However the symbol information of VSB modulated signal is contained in I channel, and Q channel is just Hilbert transform of I channel. For the reason, VSB modulated symbols can not have fixed phase like QAM modulated symbols, and VSB modulated symbols is more sensitive to carrier frequency offset. Therefore we perform phase correction of received PN sequence to improve performance.

A study of STB software development for streaming synchronized data processing (스트리밍 동기화 데이터 처리를 위한 단말 소프트웨어 개발에 관한 연구)

  • 신중목;유지상
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.29 no.6A
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    • pp.690-696
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    • 2004
  • Advanced Television Systems Committee (ATSC) -A/90, which is a standard for terrestrial data transmission in Korea, defines synchronized data that has a strong timing association with a separate Program Element. It is classified as synchronized streaming data that is carried in packetized elementary stream (PES) packets or a synchronized non-streaming data that shall be carried in digital storage media command and control (DSM-CC) section. In this paper, we study the design and verification of synchronized streaming data processing algorithm based on ATSC -A/90. We designed a parser and a player for the algorithm development. The received PES packet including synchronized streaming data is parsed in the parser. The parsed synchronized streaming data is synchronized and displayed by player. Finally, we ascertained that STB was working properly with MPEG-2 transport stream (TS) containing synchronized streaming data, as the proposed algorithm is implemented on a set-top box.

Broadband Content Insertion Technology based on Terrestrial UHD Broadcasting MMT/ROUTE (지상파 UHD 방송 MMT/ROUTE기반 브로드밴드 콘텐츠 삽입 기술)

  • Kim, Doohwan;Lee, Dongkwan;Kim, Kyuheon
    • Journal of Broadcast Engineering
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    • v.24 no.2
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    • pp.329-340
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    • 2019
  • Recently, broadcasting technologies have evolved as high-quality AV services such as domestic terrestrial UHD(Ultra-High Definition) broadcasting have been increasing, and broadcasting standards have been newly defined. Also, as network technology develops, contents are consumed not only in the country but also the world. Accordingly, content insertion technology, which is a method of providing suitable contents in accordance with the national and local environments, will be needed. This paper proposes a content insertion service system model and synchronization scheme using ATSC(Advanced Television Systems Committee) 3.0 Event Signaling standard under heterogeneous network environment of broadcasting network and internet network based on transmission standard DASH(Dynamic Adaptive Streaming over HTTP)/ROUTE(Real time Object delivery Over Unidirectional Transport) and MMT(MPEG Media Transport) of terrestrial UHD broadcasting. It also verifies that the service operates in an environment that meets the broadcast standard.