Robust Emergency Communications Using TxID Watermark of ATSC DTV System

Abstract

<p class="MsoNormal" style="text-align: left; margin: 0cm 0cm 0pt; layout-grid-mode: char;" align="left"><span class="text"><span style="font-family: ";Verdana";,";sans-serif";; mso-bidi-font-family: Arial;"><span style="font-size: x-small;">In today’s world, having a reliable communication system during emergency situations is of paramount importance to lessen the impact of the disasters. This paper proposes an emergency communication technique which is enabled by ATSC DTV transmitter identification (TxID) watermark signal. Theoretical and simulation results show that ATSC TxID watermark signal can reach a larger coverage area than the 8-VSB DTV signal and hence can be used to enable emergency communication during national disastrous situations. The coverage for this emergency communication system is predicted using popular Hata-Davidson propagation model and coverage maps clearly showing the extended and overlapped coverage for DTV stations in Huron and Stratford area in the province of Ontario, Canada is presented. Comparison with other existing emergency communication systems is carried out and performance matrices such as alerting message error rate, required no. of stations, network reliability etc. are evaluated to assess the robustness of the proposed emergency communication system.</span></span></span><span style="mso-bidi-font-family: Arial;"></span></p&gt

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

“…Several different emergency alert systems (EASs) including terrestrial digital multimedia broadcasting and one segment systems have been researched for mobile broadcasting [1]- [3]. In addition, an EAS using a transmitter identification watermark signal for use in the Advanced Television Systems Committee (ATSC) Terrestrial Digital Television (DTV) system has been proposed [4].…”

An improved data transmission scheme using TxID and Walsh sequences in the ATSC terrestrial DTV systems

“…On the other hand, in [2] and [3], a very low-rate additional data transmission scheme was developed by modulating the amplitude and polarity of the TxID signal. However, the achievable data rate of the scheme in [2] is at most up to a few hundreds bps (bit per second), e.g., 210 bps with 4-PAM (pulse amplitude modulation).…”

Additional Data Transmission Scheme Using TxID Signal for ATSC System

“…TxID 신호는 TxID 신호 분석기를 이용하여 추출 및 분석이 가능하고, 이를 이 용하여 SFN에서 각 송신기 및 중계기에 의하여 발생되는 채널 환경을 추정할 수 있다 [6] . 기존에 TxID 신호를 이용하여 부가적인 신호를 전송하 는 방안이 제안되었다 [7,8] . 기존에 제안된 부가데이터 전송 [9] .…”

“…where [11] . [7] . 따라서 동기를 맞추기 위하여 요구되는 최소한의 CNR 값과 부가 데이터의 비트오율 성능을 나타낸 그림 7의 결과를 통하여  이 0인 경우와  이 8인 경우 모두 부가데이터를 전송하…”