PROJECT TITLE :

Layered-Division-Multiplexing: Theory and Practice

ABSTRACT:

As the subsequent generation digital TV (DTV) customary, the ATSC three.zero system is developed to produce significant improvements on the spectrum potency, the service reliability, the system flexibility, and system forward compatibility. One in all the high-priority necessities for the ATSC three.zero is the aptitude to deliver reliable mobile TV services to a massive 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 sturdy high-definition (HD) mobile TV and ultra-HDTV services in one six MHz channel, with a better 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.zero systems. First, the basic advantages of the LDM over the traditional TDM/FDM systems are analyzed from info theory point of read. The performance blessings of the LDM are then confirmed by in depth simulations of the ATSC 3.0 system. It is shown that, LDM will notice the potential gain offered by superposition coding over the TDM/FDM systems, by properly configuring the transmission power, channel coding, and modulation, and using completely different multiple antenna technologies within the multiple layers. Next, the efficient implementation of LDM within the ATSC 3.0 system is presented to indicate that the performance blessings of the LDM are obtained with little additional complexity. This is often achieved by carefully aligning the transmission signal structure and also the signal processing chains within the multiple layers. Finally, we tend to show that the LDM will be further integrated with completely different multiple antenna technologies to achieve additional transmission capacity.