从ATSC1.0到ATSC3.0/3.1过渡的简洁快捷途径——基于LDM(层分复用)+OFDM(或OFDM/SCS)

Fast easy way to transit from ATSC 1.0 to ATSC3.0/3.1: based on LDM + UL- OFDM/LL- SCS( or OFDM/SCS)

介绍ATSC3.0草案标准3方面技术亮点:1)广播业者优先向用户提供无线宽带互联网的移动接收服务;2)其视频节目源频谱利用率与1.0相比,有约5.1倍关系;3)采纳层分复用(LDM)创新技术后,不更换发射机的条件下,可在6 MHz频道内、同时提供传统屋顶天线固定接收的4 K-UHDTV(用户"在家时")和其720 p-HDTV版移动接收(用户"出门时")共两大类崭新服务。重点向ATSC主席建议,依据新资料的详细说明:增添LDM+UL-OFDM/LL-SCS新内容;对于美国超过90%的中小广播业者,提出一条简洁快捷途径、实现ATSC1.0向3.0/3.1过渡,即用极少量投资、抢先发展单向的服务,从数字红利中积累资金,以缓慢步伐逐步升级,也能达到建成用户以双向无线宽带互联网移动接收为主的同样目标,而技术上则采纳LDM+OFDM或LDM+OFDM/SCS。此外,还讨论ATSC3.0组建大中小功率发射的合理地面数字电视网络部署,再次建议ATSC3.0采纳中国地面国标已应用的"宽带多频道DTV发射机组建M-SFN"技术。

The progress of ATSC 3.0 draft standards is briefly reviewed first in this paper, and three technical highlights of 3.0 are introduced： 1 ） wireless broadband Internet services for users＇mobile reception by broadcasters in the first place. 2） the vid- eo sources bandwidth efficiency of 3.0 in comparison to 1.0 with-5.1 times improvement. 3 ） new LDM （ Layered Division Multiplexing） technique adopted, to deliver 4K-UHDTV services in traditional roof-top antenna fixed reception for users ＂In- The-Home＂ , together with its 720p-HDTV version for the users＇ new mobile reception ＂On-The-Go＂ , within the same 6 MHz channel,without change of emitter. The main content of this paper is the Chinese version of the author＇ s proposal to the Presi- dent of ATSC, with detailed discussions based on new publications, as well as important addition of LDM ＋ UL-OFDM/LL- SCS. For 〉 90 % of US broadcasters, there is a fast easy way to transit from ATSC 1.0 to 3.0/3.1 ： with little investments at the start, delivering one-way signals only, winning new incomes from digital dividend, planning＇ several steps in moderate paces （ not a large quick pace） ＇, and reaching the same final goal to upgrade their systems into Two-Way wireless broadband Internet services for the mobile users. The reasonable DT＇FB networks deployment of ATSC 3.0 is discussed, using large, middle and small power emissions together, while wide-band multi-channel DTV emitters using M-SFN （ Multi-channels Single Frequency Network） technique, widely used in DTMB of China, is once again recommended.