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학술지 Using LDM to Achieve Seamless Local Service Insertion and Local Program Coverage in SFN Environment
Cited 27 time in scopus Download 4 time Share share facebook twitter linkedin kakaostory
Wei Li, Yiyan Wu, Liang Zhang, Khalil Salehian, Sebastien Lafleche, Dazhi He, Yao Wang, Yunfeng Guan, Wenjun Zhang, Jon Montalban, Pablo Angueira, Manuel Velez, 박성익, 이재영, 김흥묵
IEEE Transactions on Broadcasting, v.63 no.1, pp.250-259
16MR2400, (통합)융합형 실감방송 서비스 및 전송 기술 개발, 허남호
Layered division multiplexing (LDM) is a spectrum efficient non-orthogonal multiplexing technology that has been adopted in the Advanced Television Systems Committee (ATSC) 3.0 Physical Layer Standard as a baseline technology. This paper studies a two-layer LDM with one layer used for providing a global service through a single frequency network (SFN), and the other for providing local coverage/services, such as location targeted advertising or local content insertion. The pilot boosting effect on SNR and co-channel interference is also analyzed. The LDM upper layer can be used to deliver time-division multiplexed mobile-HD and 4k-UHD services. The LDM lower layer with a negative SNR threshold can reliably provide seamless local coverage/service from each SFN transmitter without coverage gaps among adjacent SFN transmitter service areas. No directional receiving antenna is required for the local service reception and receivers simply tune into the stronger signal. In such LDM systems, while the upper layer is operating in a traditional SFN mode, the lower layer operates in a special form of distributed MIMO or gap-filler mode to provide targeted local coverage. For implementing the two-layer system introduced in this paper, only ATSC 3.0 baseline technologies are used, i.e., there is no need to modify the ATSC 3.0 standard. Given the upper and lower layers' data rate requirements and the SNR thresholds, the lower layer power, with respect to the upper layer (injection level), can be optimized to maximize upper and lower layer performance and coverage. Since the advertisement time of the local service is typically less than 20% of the program time, nonreal time could be used to play-back the local content at five times the transmission bit rate for better (audio/video) service quality.
KSP 제안 키워드
ATSC 3.0, Advanced television systems committee(ATSC), Bit Rate, Boosting effect, Gap-Filler, Injection level, Local Service Insertion, Multiplexing technology, Non-orthogonal multiplexing, Physical Layer, Program coverage