Layered-Division-Multiplexing: Theory and Practice
Layered-Division-Multiplexing: Theory and Practice
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DOI：
10.1109/tbc.2015.2505408
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发表时间：
2016-01
影响因子：
4.5
通讯作者：
Liang Zhang;Wei Li-;Yiyan Wu;Xianbin Wang;S. Park;H. Kim;Jae-young Lee;P. Angueira;J. Montalbán-J.-Montal
中科院分区：
文献类型：
--
作者：
Liang Zhang;Wei Li-;Yiyan Wu;Xianbin Wang;S. Park;H. Kim;Jae-young Lee;P. Angueira;J. Montalbán-J.-Montal
ATSC 3.0系统作为下一代数字电视（DTV）标准，在频谱效率、业务可靠性、系统灵活性和系统前向兼容性等方面有了显著提高。ATSC 3.0的首要要求之一是能够向各种各样的移动和室内设备提供可靠的移动电视服务。分层多路复用（LDM）是一种物理层非正交多路复用技术，用于在一个电视频道中有效地提供不同鲁棒性和吞吐量的多种业务。ATSC 3.0接受两层LDM结构作为基准物理层技术。该LDM系统能够在一个6mhz信道中提供可靠的高清（HD）移动电视和超高清电视服务，比传统的基于时/频分复用（T/FDM）的数字电视系统具有更高的频谱效率。本文详细介绍了LDM技术及其在atsc3.0系统中的应用。首先，从信息论的角度分析了LDM相对于传统TDM/FDM系统的基本优势。然后通过对ATSC 3.0系统的大量仿真验证了LDM的性能优势。研究表明，通过合理配置发射功率、信道编码和调制，以及在多层中使用不同的多天线技术，LDM可以实现叠加编码在TDM/FDM系统上提供的潜在增益。其次，给出了LDM在ATSC 3.0系统中的高效实现，表明LDM在获得性能优势的同时，增加了较小的复杂度。这是通过仔细对准传输信号结构和多层信号处理链来实现的。最后，我们证明了LDM可以与不同的多天线技术进一步集成，以实现进一步的传输容量。
As the next generation digital TV (DTV) standard, the ATSC 3.0 system is developed to provide significant improvements on the spectrum efficiency, the service reliability, the system flexibility, and system forward compatibility. One of the top-priority requirements for the ATSC 3.0 is the capability to deliver reliable mobile TV services to a large variety of mobile and indoor devices. Layered-division-multiplexing (LDM) is a physical-layer non-orthogonal-multiplexing technology to efficiently deliver multiple services with different robustness and throughputs in one TV channel. A two-layer LDM structure is accepted by ATSC 3.0 as a baseline physical-layer technology. This LDM system is capable of delivering robust high-definition (HD) mobile TV and ultra-HDTV services in one 6 MHz channel, with a higher spectrum efficiency than the traditional time/frequency-division-multiplexing (T/FDM)-based DTV systems. This paper presents a detailed overview on the LDM technology, and its application in the ATSC 3.0 systems. First, the fundamental advantages of the LDM over the traditional TDM/FDM systems are analyzed from information theory point of view. The performance advantages of the LDM are then confirmed by extensive simulations of the ATSC 3.0 system. It is shown that, LDM can realize the potential gain offered by superposition coding over the TDM/FDM systems, by properly configuring the transmission power, channel coding, and modulation, and using different multiple antenna technologies in the multiple layers. Next, the efficient implementation of LDM in the ATSC 3.0 system is presented to show that the performance advantages of the LDM are obtained with small additional complexity. This is achieved by carefully aligning the transmission signal structure and the signal processing chains in the multiple layers. Finally, we show that the LDM can be further integrated with different multiple antenna technologies to achieve further transmission capacity.