Performance Study of Layered Division Multiplexing Based on SDR Platform

Abstract

Two of the main drawbacks of the current broadcasting services are, on the one hand, the lack of flexibility to adapt to the new generation systems requirements, and on the other hand, the incapability of taking a piece of the current mobile services market. In this paper, Layered Division Multiplexing (LDM), which grew out of the concept of Cloud Txn, is presented as a very promising technique for answering those challenges and enhancing the capacity of broadcasting systems. The major contribution of this work is to present the first comprehensive study of the LDM performance behavior. In particular, in this paper, the theoretical considerations of the LDM implementation are completed with the first computer based simulations and laboratory tests, covering a wide range of stationary channels and the mobile TU-6 channel. The results will support LDM as a strong candidate for multiplexing different services in the next generation broadcasting systems, increasing both flexibility and performance.

Layered Division Multiplexing With Multi-Radio-Frequency Channel Technologies

“…With this, a robust layer carries service to mobile receivers while a high capacity layer is intended to transmit services to fixed users. LDM can outperform traditional solutions for the delivery of fixed and mobile services based on Time Division Multiplexing (TDM) [5], [6], such as the use of physical layer pipes (PLPs) or future extension frames (FEFs) in the T2-Lite profile in DVB-T2 [7], or Frequency Division Multiplexing (FDM), as implemented in Integrated Services Digital Broadcasting -Terrestrial (ISDB-T) [8]. With LDM, each layer uses the full radio-frequency (RF) bandwidth and transmission time, leading to a higher spectral efficiency.…”

LDM Versus FDM/TDM for Unequal Error Protection in Terrestrial Broadcasting Systems: An Information-Theoretic View

“…LDM with two layers fits very well the use case of simultaneous transmission of fixed and mobile services in DTT networks [6]. The first (upper) layer is intended for the mobile users, and is encoded with a powerful low-rate forward error correction (FEC) code so that the mobile receivers can decode even at SNR thresholds below 0 dB [7].…”

Advanced Layered Divsion Multiplexing Technologies for Next-Gen Broadcast

“…All the previous simulation results were also corroborated by laboratory tests using an Software Dened Radio (SDR) platform [58], [59]. Furthermore, eld test results carried out in Jeju city, South Korea [60] [62] or in Cleveland, U.S. [63] veried that LDM enabled broadcasters to simultaneously provide a variety of services with dierent robustness within a single RF channel more eciently.…”