• 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.

• Journal of Broadcast Engineering
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• v.18 no.3
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• pp.435-444
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• 2013

ATSC terrestrial DTV system can support high data rates for HDTV(High Definition Television) service, but it suffers from significant performance degradation caused by multipath fading. Thus, it is necessary to analyze multipath fading effects in order to enhance the DTV reception performance. Generally, DTV channel profile can be obtained by auto-correlation between reference pseudo random signal and received DTV signal. However, in the ATSC terrestrial DTV system, the estimation performance of DTV channel profile may be decreased due to the VSB modulation features. In this paper, improved DTV channel profile measurement technique is analyzed and proposed.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.38A no.11
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• pp.955-966
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• 2013

We propose two feedback interference cancellers(FICs) to improve the performance of the equalization digital on-channel repeater(EDOCR) with the FIC for the ATSC DTV broadcasting system. The FIC estimates the feedback channel between Tx. and Rx. antennas of the repeater by cross-correlating the reference signal and the feedback signal. Since there is a DC pilot which ruins the white property of the ATSC DTV signals, the FIC cannot estimate the feedback channel accurately. To solve the problem, the structural method which uses an additional DC pilot free reference for feedback channel estimation and the algorithmic method based on the digital signal processing which whitens the ATSC DTV signals and performs the feedback cancellation in the whitened signal domain. Simulation results show that the proposed two FICs show better feedback cancellation performance than the conventional FIC.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2004.11a
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• pp.259-262
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• 2004

본 논문은 열악한 채널 환경에서 ATSC 방식의 DTV 수신기의 성능 개선을 위해 빔 선택형 DTV 수신기 구조와 최적의 빔 선택을 위한 알고리즘을 제시하고자 한다. 빔 선택형 DTV 수신기의 채널 개선으로 인한 수신기의 성능 개선 효과와 이에 따른 최적 빔 선택을 위한 조건들을 살펴된다. 그리고 필드 테스트를 통해 측정된 ATSC DTV 수신 채널 모델링을 이용하여 등차기만을 사용하는 기존의 DTV수긴기와 빔 선택형 DTV수신기의 성능을 모의 실험을 통해 확인하였다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2012.07a
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• pp.350-351
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• 2012

본 논문에서는 ATSC 지상파 DTV시스템에서 계층변조를 사용하여 재난 방송용 부가 데이터를 전송하는 기법을 제안한다. ATSC 지상파 DTV시스템에서 계층변조를 사용하는 방식으로는 ADT(Augmented Data Transmission) 방식과 대역확산방식이 있다. ADT방식은 상대적으로 높은 데이터 전송율을 가지지만 신호가 도달할 수 있는 커버리지가 좁은 반면 대역확산방식은 낮은 데이터 전송률을 가지지만 신호가 도달할 수 있는 커버리지가 넓은 장점이 있다. 따라서, 재난 발생시 넓은 커버리지에 신속하게 긴급경보 방송을 송신하기 위해서는 대역확산기반의 계층변조 방식이 유리하다. 본 논문에서는 ATSC 지상파 DTV시스템에서 긴급경보 방송을 위해 대역확산기반의 계층변조 방식을 사용한 경우 전송용량 및 전계강도와 도달할 수 있는 전송 거리를 분석한다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2015.11a
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• pp.23-25
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• 2015

최근 디지털 방송의 새로운 서비스에 대한 소비자의 기대와 무선 통신 및 영상 압축 기술의 발전으로 인해 차세대 방송 기술에 대한 관심이 고조되고 있다. 미국 방송 표준화 기구인 ATSC에서는 차세대 국제 방송 표준을 위해 ATSC 3.0을 시작하였고, 고정 방송 및 이동 방송의 동시 서비스 제공을 목표로 하고 있다. TDM을 사용하여 두 방송 서비스를 제공하는 경우 ATSC 3.0 융합형 3DTV 서비스를 제공할 수 있으며, 모바일 방송의 파일럿 심볼을 이용한 채널 추정이 가능하므로 고정 방송만을 제공하는 경우보다 채널 등화 성능 측면에서 더 유리하다. 이에 본 논문에서는 ATSC 3.0 융합형 3DTV를 위한 채널 등화 시뮬레이터를 설계 및 구현하여 고정 방송 환경과 성능을 비교한다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.10 no.3
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• pp.167-172
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• 2010

In this paper, we analyze and simulate the performance of a pilot signal detection algorithm based on fast Fourier transform (FFT) for several system parameters in order to detect advanced television system committee digital television (ATSC DTV) signals. Requirements for detecting DTV signals are analyzed. And the detection performance is compared according to sensing frequency and time. Form the simulation results, it is confirmed that the signal detection performance increases as the sensing frequency rises. The results of this paper can be applied for implementing cognitive radio (CR) systems in the frequency band of DTV signals.

• Journal of the Korea Society of Computer and Information
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• v.15 no.8
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• pp.41-49
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• 2010

Digital broadcasting system has various affecting factors unlike analog broadcasting system, and has possibility of no signal reception in case of errors due to characteristics of digital system. And, digital broadcasting system has monitoring system for error occurrences handling various factors. ATSC mobile DTV system uses legacy frequency and provides mobile broadcasting services, and also requires monitoring systems for monitoring online broadcasting services and reporting to administrator about interference or influence with legacy systems, and error situations. In this paper, we propose efficient monitoring system which monitors online broadcasting status of ATSC mobile DTV, reports on poor signal reception, video streaming failures to administrator, and maintains reliable digital broad ca sting system.

• Journal of Broadcast Engineering
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• v.12 no.6
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• pp.641-648
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• 2007

The decoding structure of up-to-date ATSC DTV receivers is well optimized, and it seems that 14.6 dB is the unbreakable minimum SNR in the AWGN channel. But the SNR satisfying the Shannon capacity of DTV receivers is 11.76 dB, So, the SNR gab between the 14.6 dB and the 11.76 dB is about 2.8 dB. In order to approach the Shannon capacity we propose a recursive trellis decoder which uses reliable feedback data obtained by an RS decoder. The performance enhancement of about 0.8 dB can be achieved in case of the AWGN channel.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.30 no.9A
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• pp.858-866
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• 2005

This paper proposes the method of frequency synchronization using the spectrum correlation in ATSC terrestrial DTV system. If the spectrum around pilot is severely distorted by multipath or mobile reception environment, the conventional algorithm using the pilot signal makes the estimation error of the frequency offset. Because the proposed algorithm acquires frequency synchronization using the correlation between the received specalm and the standard spectrum without the use of pilot, the proposed method can acquire frequency synchronization faster and more accurate than conventional algorithm. And this paper proposes new method for ATSC frequency synchronization without the use of pilot.