Sung Ik Park

A Study on Performance Analysis for Terrestrial Cloud Transmission Systems

In this paper, we model the interference plus noise signal for terrestrial cloud transmission systems and present bit error rate (BER) performances. Since terrestrial cloud transmission systems experience co-channel interference from one or more transmitters, they have to operate under a negative signal-to-interference plus noise ratio (SINR) region. The interference plus noise signal can be modeled as Gaussian random variable under the required SINR region and we observe the BER performance of the cloud transmission system using the derived model. Also, we propose an improved channel estimation scheme by averaging the channel estimates based on least square based interpolation scheme. Simulation results show that the cloud transmission system can operate under negative SINR region using the proposed channel estimation scheme.

Study on Synchronization Using Bootstrap Signals for ATSC 3.0 Systems

In ATSC 3.0 systems, a bootstrap signal is located at the start of each frame. In this paper, we propose an initial synchronization scheme for ATSC 3.0 systems using the bootstrap signal. The bootstrap signal of ATSC 3.0 has several repetition patterns in the time domain. By utilizing the repetition patterns within the bootstrap, the proposed scheme can obtain an initial synchronization at the receiver. Also, simulation results show that the proposed scheme can obtain an initial synchronization at very low signal-to-noise ratios. Keyword : Advanced Television Systems Committee (ATSC) 3.0, bootstrap, orthogonal frequency division multiplexing (OFDM), synchronization a) 한국해양대학교 전자전기정보공학부(Division of Electronics and Electrical Information Engineering, Korea Maritime and Ocean University) b) 한국전자통신연구원 방송시스템연구부(Broadcasting Systems Research Department, Electronics and Telecommunications Research Institute (ETRI)) ‡Corresponding Author : 김정창(Jeongchang Kim) E-mail: jchkim@kmou.ac.kr Tel: +82-51-410-4315 ORCID: http://orcid.org/0000-0002-8612-9360 ※본 연구는 미래창조과학부 및 정보통신기술진흥센터의 정보통신·방송 연구개발 사업의 일환으로 수행하였음. [R0101-16-294 (융합형 실감방송 서비스 및 전송 기술 개발)] ※본 논문은 “2016년 한국방송 미디어공학회 하계학술대회”에서 부분적으로 발표되었음. ・Manuscript received September 12, 2016; Revised November 7, 2016; Accepted November 16, 2016. Copyright C 2016 Korean Institute of Broadcast and Media Engineers. All rights reserved. “This is an Open-Access article distributed under the terms of the Creative Commons BY-NC-ND (http://creativecommons.org/licenses/by-nc-nd/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited and not altered.” 특집논문 (Special Paper) 방송공학회논문지 제21권 제6호, 2016년 11월 (JBE Vol. 21, No. 6, November 2016) http://dx.doi.org/10.5909/JBE.2016.21.6.899 ISSN 2287-9137 (Online) ISSN 1226-7953 (Print) 900 방송공학회논문지 제21권 제6호, 2016년 11월 (JBE Vol. 21, No. 6, November 2016)

Analysis on Co-channel Interference Coverage of ATSC DTV

Recently, the digital television transition from analog television to digital television has been progressing in terrestrial broadcasting. As a result of the DTV transition, additional reassignments and deployments of TV White spaces (TVWS) caused by co-channel interference (CCI) were needed. In this paper, we investigate the TVWS caused by CCI using Longley-Rice and ITU-R P.1546 propagation model, which are the most widely-used propagation model. In addition, we analyze the service coverage radius and CCI radius according to the height of transmitter antenna and transmitting power. The results show that the ratios of CCI radius to service coverage radius in Longley-Rice and ITU-R P.1546 propagation model are about 2.54 and 2.07, respectively.

Distributed Translator Part 2: Laboratory Test Results

This paper presents and analyzes laboratory test results of distributed translator (DTxR) for distributed frequency network (DFN) in the ATSC (Advanced Television Systems Committee) terrestrial digital TV broadcasting system. The DTxR laboratory test is classified to receiving part test and transmitting part test. The receiving part test includes dynamic range, random noise, single echo, and adjacent channel interference. The transmitting part test includes quality of output signal (out-of channel emission, quality of transmitting signal, and phase noise), frequency synchronization among output signals, and TxID (Transmitter Identification) signals affect to the legacy receiver. By the laboratory test results, the receiving part of DTxR eliminates average -2.5 dB of single echo and has average 17.5 dB at TOV (Threshold of Visibility) under random noise environment. In addition, the transmitting part of DTxR satisfies the specification of US FCC (Federal Communications Commission), and frequency difference among DTxR output signals is less than 0.001 Hz.

Distributed Translator Part 1: Distributed Translator Technology

This paper considers technological requirements to broadcast digital television signals using distributed frequency network (DFN) in the advanced television systems committee (ATSC) transmission system and proposes distributed translator (DTxR) to meet such requirements. In the DFN, DTxR uses different frequency from main transmitter, but same among DTxRs. In addition, this paper introduces digital signal processing (DSP) techniques, which consist of demodulation, equalization, transmitter identification (TxID) generation and insertion, and modulation, to implement DTxR.