• Title/Summary/Keyword: TxID

Search Result 29, Processing Time 0.037 seconds

Transmitter Identification Signal Analyzer (송신기 식별 신호분석기)

  • Park, Sung-Ik;Lee, Jae-Young;Kim, Heung-Mook;Oh, Wang-Rok
    • Journal of Broadcast Engineering
    • /
    • v.13 no.3
    • /
    • pp.350-364
    • /
    • 2008
  • Single frequency network (SFN) design based on the Advanced Television Systems Committee (ATSC) specification, a terrestrial digital television (DTV) system, normally causes a interference problem, among signals from multiple transmitters or repeaters. To solve this, the ATSC recommended practice (RP) introduces a transmitter identification (TxID) signal embedded in a signal from each transmitter or repeater. A TxID signal analyzer is then used to detect the TxID signal, and following the analysis results, a SFN design can be adjusted. This paper discusses the generation and usages of Kasami sequence, is used the TxID signal. The configuration of the TxID signal analyzer to efficiently detect TxID signal is proposed and the results of theoretical performance analysis are provided. Moreover, computer simulation and laboratory test results are provided to evaluate the performance of TxID signal analyzer and the theoretical performance analysis.

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
    • /
    • v.16 no.1
    • /
    • pp.64-72
    • /
    • 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.

The Analysis of TxID Signal's Effect to Legacy Receivers in ATSC DTV System (ATSC DTV 시스템에서 TxID 신호가 기존 수신기에 미치는 영향 분석)

  • Mok, Ha-Kyun;Park, Sung-Ik;Lee, Jae-Kwon;Ryu, Ho-Jin;Kim, Heung-Mook
    • Journal of Broadcast Engineering
    • /
    • v.15 no.3
    • /
    • pp.414-425
    • /
    • 2010
  • When we implement the single frequency network (SFN) in ATSC terrestrial DTV system, there is an interference problem to DTV receivers due to the use of same frequency channel among transmitters and repeaters. To resolve this problem, it is recommended to adopt the transmitter identification signals in transmitting equipments. In this paper, we analyzed the influence suffered by legacy DTV receivers when the TxID signal is added to the DTV transmitting signals and the results were further verified by computer simulation, laboratory test and field test. The above tests show that if the TxID signal is added to the level of -30dB compared to the original DTV signal, the TOV(Threshold Of Visibility) increment in legacy receivers is about 0.17 dB. It means that we can insert and transmit the TxID signal in ATSC terrestrial DTV system without making the negative effect to the legacy DTV receivers.

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
    • /
    • v.47 no.8
    • /
    • pp.99-107
    • /
    • 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.

A Study of Spreading code for Watermarking of TxID of ATSC-DTV (ATSC-DTV의 송신기 식별을 위한 워터마킹용 확산코드에 관한 연구)

  • Cha Jae-Sang;Choi Seong-Jin;Lee Seon-Hee;Lee Kwang-Jik;Lee Yong-Tae;Park Goo-Man
    • Journal of Broadcast Engineering
    • /
    • v.11 no.1 s.30
    • /
    • pp.100-106
    • /
    • 2006
  • In this paper, we proposed a TxID(Transmitter Identification) system using ZCD (Zero Correlation Duration) code as interference-cancelled spread codes for single frequency network of ATSC terrestrial DTV broadcasting. ZCD codes are simply implemented and have ZCD characteristics. Then, Proposal system can fundamentally solve interference problems caused by ICI(Inter Code Interference) and MPI(Multi-Path Interference) which happens in TxID system using spread coding method. Also, those can cancel truncated error which happens at watermarking for TxID since those can remove its period. In this paper, we identified the availability of TxID system applying interference-cancelled ZCD codes by analyzing DER (Detection Error Rate) which is simulated in various interference environments such as AWGN, ICI, and MPI.

Efficient Digital Signal Processing of DTV TxID Based On Decimation Algorithm (Decimation 알고리즘을 이용한 DTV TxID수신 신호의 효율적인 신호처리 기법에 관한 연구)

  • Son, Ju-Hee;Lee, Yong-Tae;Park, Sung-Ik;Kim, Heung-Mook;Seo, Jae-Hyun;Lee, Jae-Young;Cha, Jae-Sang
    • Journal of Broadcast Engineering
    • /
    • v.12 no.3
    • /
    • pp.266-277
    • /
    • 2007
  • Recently, Transmitter Identification(TxID) technology has been issued as a technology of ATSC DTV. ATSC DTV networks are comprised of a plurality of transmitters, broadcasting the same signal sing one frequency network(SFN) connected to EDOCR. In this single frequency network, TxID technology has been recognized as a technology in the ATSC DTV system since it enables the broadcast authorities and classify multiple transmitters. However, conventional TxID uses extremely long spreading sequence to identifying transmitters, so it increases H/W complexity and registers. Thus, to solve those hardware problems, we propose an efficient signal processing technology using decimation algorithm. Furthermore, we certified the availability of the proposed algorithm via various simulations.

Transmitter Identification for ATSC 3.0 Single Frequency Network (ATSC 3.0 단일주파수망을 위한 송신기 식별 기술)

  • Ahn, Sungjun;Park, Sung-Ik;Kwon, Sunhyoung;Lee, Jae-Young;Kim, Heung Mook
    • Proceedings of the Korean Society of Broadcast Engineers Conference
    • /
    • 2017.06a
    • /
    • pp.131-132
    • /
    • 2017
  • 본 논문에서는 차세대 ATSC 3.0 표준 기반 단일주파수망 (Single frequency network, SFN) 지상파 방송시스템에서의 송신기 식별 (Transmitter identification, TxID) 기술을 살펴보고 그 성능을 분석한다. SFN 기반 지상파 방송은 복수의 송신기를 동일한 주파수 대역에서 운용하는 것에서 발생하는 간섭으로 인한 영향을 최소화하기 위해 적절한 망 설계를 필요로 한다. 용이한 망 설계를 위해, ATSC 3.0 물리계층 표준은 TxID 기술을 통해 개별 송신기에서 전송된 신호를 판별할 수 있도록 지원한다. 이에 본 논문에서는 ATSC 3.0 표준에서 지원하는 TxID 신호 생성 및 검출 기술을 소개한다. 더불어, 전산 실험을 통해 해당 TxID 기술의 식별 성능이 TxID 신호의 삽입 준위가 매우 낮은 환경에서도 보장됨을 확인한다.

  • PDF

Efficient Digital Signal Processing of DTV TxID Based On Decimated Correlation Scheme (Decimated Correlation 기법을 이용한 DTV TxID수신 신호의 효율적인 신호처리 기법에 관한 연구)

  • Son, Ju-Hee;Lee, Yong-Tae;Park, Seong-Ik;Kim, Heung-Muk;Kim, Seung-Won;Lee, Jae-Young;Cha, Jae-Sang
    • Proceedings of the Korean Society of Broadcast Engineers Conference
    • /
    • 2006.11a
    • /
    • pp.219-222
    • /
    • 2006
  • 최근 들어 ATSC-DTV의 미래형 핵심기술로 손꼽히고 있는 송신기 식별기술(TxID ; Transmitter Identification)이 새로운 신기술로 대두되고 있으며, 이에 대한 구현성 검증은 현재 활발하게 논의 중인 재생중계기(EDOCR)와 연계된 단일주파수망(SFN; Single Frequency Network)기술의 실용화를 위한 핵심적 역할을 한다고 볼 수 있다. 하지만 종래의 TxID기술은 긴 주기의 워터마킹용 확산코드를 사용하므로 수신기 입장에서 하드웨어 부피가 크게 증가되는 문제점을 갖고 있다. 따라서 본 논문에서는 TxID 수신기 하드웨어 부피를 크게 경감시킬 수 있는 새로운 Decimated Correlation 기법을 이용한 DTV TxID 수신 신호의 효율적인 신호처리 기법을 제시하였으며, 모의실험을 통한 성능평가를 통해 제안한 알고리즘의 유용성을 입증하였다.

  • PDF

Field Test on the Backward Compatibility of ATSC DTV TxID Signal (ATSC DTV TxID 신호의 역호환성에 관한 필드 테스트)

  • Seo, Jae-Hyun;Park, Sung-Ik;Choi, Dae-Won;Kim, Heung-Mook;Lee, Soo-In
    • Proceedings of the Korean Society of Broadcast Engineers Conference
    • /
    • 2010.07a
    • /
    • pp.18-19
    • /
    • 2010
  • ATSC 방식의 지상파 디지털 TV 방송에서는 단일 주파수 망 구성 시 송신기들과 중계기들이 단일 주파수를 사용함에 따라 수신기에서 간섭 문제가 발생한다. 이를 해결하기 위하여 ATSC 권고에서는 각 송신기 및 중계기에 RF Watermark 방식의 식별 (TxID: Transmitter Identification) 신호를 할당하여 송신 및 중계 신호에 부가하여 전송하도록 권고하고 있다. 본 논문에서는 기존 DTV 신호에 부가되어 전송되는 RF Watermark 방식의 TxID 신호가 상용 DTV 수신기에 미치는 영향을 분산주파수망을 이용하여 실제 필드 테스트를 통해 살펴본다.

  • PDF

Improved TxID Signal Detection Method for ATSC DTV System (ATSC DTV 시스템을 위한 TxID 신호검출 성능향상 기법)

  • Lee, You-Seok;Seo, Jae Hyun;Kim, Heung-Mook
    • Proceedings of the Korean Society of Broadcast Engineers Conference
    • /
    • 2012.07a
    • /
    • pp.183-184
    • /
    • 2012
  • 동일 주파수를 이용하여 방송신호를 송출하는 동일채널중계기의 신호 송출 타이밍과 파워를 조절함으로써 신호 중첩지역에 위치한 수신기의 성능 열화를 최소화 할 수 있다. 이를 위해 방송망을 구성하는 각각의 동일채널중계기에 고유의 TxID를 부여하여 DTV 신호에 낮은 파워로 삽입하여 송출한다. 본 논문에서는 동일채널중계기에 삽입된 TxID 신호의 검출 성능을 향상시키기 위한 방법을 제안하고 모의실험을 통해 제안된 방법의 효과를 검증한다.

  • PDF