Layered Division Multiplexing: Basics Concepts, Application Scenarios and Performance

This paper presents Layered Division Multiplexing (LDM), a technology that may be used to provide a flexible multi-layer system transmission by means of spectrum overlay. This technology can be used to simultaneously deliver multiple program streams with different characteristics and robustness for different services (mobile TV, HDTV and UHDTV) in one RF channel. — In Layer Division Multiplex (LDM) the signal to be transmitted consists of a number of different independent signals superimposed together at different injection levels to form a multi-layer signal. Each layer can have its own characteristics. The top layer is the most robust one, which has a negative Signal to Noise Ratio (SNR) system threshold value, and can be used for robust mobile service. The lower layer(s) can be used to provide fixed high data rate services, such as multiple High Definition Television (HDTV) and Ultra High Definition Television (UHDTV). For example, DVB-T2, or an alternative design of a high data rate transmission system can be used for the second layer. The upper layer signal can be a separate program, or be used for delivering supplementary bit rate to be combined with the lower layer signal to provide additional features or achieve higher quality of service (e.g., scalable video coding and placing audio on upper layer for extra robustness).

Published

2015-07

Content type

Original Research

Keywords

Digital Terrestrial Television, DVB-T2, ATSC 3.0, Layered Division Multiplexing, Cloud Transmission, UHDTV, SHEVC, Mobile TV

DOI

10.5594/M001607

ISBN

978-1-61482-955-3