By the end of August 2016,ATSC3.0 PHY working group has continuously discussed about the technology details of the MAC Layer and PHY Layer,PHY Layer tech documentsare completed and document about Broadcast Gateway in MAC Layer is under modification and completion.This paper mainly focuses on operating principles,functions and requirements of the Broadcast Gateway,STL link and SFN transmitters in ATSC3.0 standard based on current working progress and relative researches.The paper is organized as follows,the location and role of the Scheduler is clear by firstly introducing the Broadcast Gateway,then we specify functions and requirements of the Scheduler,STL link between the Broadcast Gateway and the Transmitters is also analyzed,finally we expound the composition of the transmitter and different modules of the PHY Layer.%截至2016年8月底,ATSC3.0物理层工作小组对链路层和物理层技术细节进行持续讨论,完善了物理层的相关文档,链路层的广播网关技术文档也在进一步修改和完善当中.文章拟就目前的工作进展,结合这方面的研究成果,具体论述ATSC3.0标准中广播网关、STL链路和发射端的工作原理和功能要求.文章的行文安排如下,首先通过对广播网关的介绍明确调度器在系统中的位置和作用,然后对调度器的功能等进行细化说明,文章还分析了从广播网关到发射端的传输链路,最后阐述发射端的组成以及物理层的各功能模块.
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