Cristina Regueiro

LDM Core Services Performance in ATSC 3.0

Advanced Television Systems Committee (ATSC) 3.0, the new generation digital terrestrial television standard, has been designed for facing the new challenges of the future broadcasting systems. ATSC 3.0 has been built using the most recent cutting-edge technologies. Layered division multiplexing (LDM) is one of the major components of the new system baseline. LDM provides a tool to make flexible use of the spectrum for delivering simultaneous services to stationary and mobile services. This paper presents the performance evaluation of ATSC 3.0 core services in mobile scenarios using LDM. Simulation results are presented to analyze the influence of different LDM ensemble configuration modes for mobile reception. The simulation results have been also confirmed by laboratory tests under different channel models. The signal to noise ratio threshold values confirm the excellent behavior of ATSC 3.0 and LDM in mobile and portable scenarios.

Performance Study of Layered Division Multiplexing Based on SDR Platform

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 paper 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.

Error propagation in the cancellation stage for a multi-layer signal reception

Cloud-Txn is a new broadcasting approach, which proposes the usage of the layer-division-multiplexing (LDM) to meet the requirements of the new generation digital TV services. Cloud Txn has been proposed as one of the candidate technologies for the Next Generation DTV systems. This technology is considered as an attractive alternative to the commonly used Time Division (TDM) and Frequency Division (FDM) multiplexing. Its main advantage lies in being more efficient as the RF channel is continuously used both in time and frequency, while the flexibility for each layer configuration is maintained. Nevertheless, the performance of this technique is closely related to the accuracy of the cancelation process required to decouple the multi-layered signals. The main objective of this paper is to analyze the possible error propagation due to the cancellation stage and the corresponding impact on the layers performance.

SHVC and LDM techniques for HD/UHD TV indoor reception

This paper presents a study that combines LDM (Layer Division Multiplexing) and SHVC (Scalable High Efficiency Video Coding) techniques to offer HD/UHD TV services in indoor scenarios. First, a theoretical study of the optimal configuration parameters for the LDM signal (such as constellation, code-rate and injection level) for indoor reception will be presented. Next, the results of some laboratory measurements for testing the performance in indoor scenarios will be included. For this purpose, TU6, PI, IOA and IOB channel models will be considered, being the main objective to determine the minimum receiving signal to noise ratios (SNR). These results will be useful for broadcasters for planning purposes.

Field Trials-Based Planning Parameters for DVB-T2 Indoor Reception

This paper presents the field trials carried out in Bilbao (Spain) for testing and analyzing the performance of the DVB-T2 indoor (fixed and pedestrian) reception. Test services with different DVB-T2 and T2-Lite configuration modes have been broadcasted and indoor measurements have been carried out. As a result, signal to noise ratio threshold values for DVB-T2 indoor reception have been obtained. These values update those provided by previous studies and are also valid for planning tools to be used by broadcasters in the development of DVB-T2 networks.

DVB-T2 field trials results for portable indoor reception using T2-Lite and multiple PLP

This paper presents the field trials carried out inside the Barcelona Exhibition Centre (Spain) for testing the DVB-T2 portable reception in indoor environments. A key point of these trials is the ability to measure different configurations of DVB-T2 at once, due to the new T2-Lite profile standardized in April 2012. This allows the simultaneous transmission of two completely different T2 profiles in a mixed mode using the Future Extension Frame (FEF) capability. For this paper, two mixed modes have been measured and the results will show their performance in a portable indoor scenario, providing reference values that can be used for network planning purposes.

Platform for advanced DVB-T2 system performance measurement

This paper presents a platform for carrying out advanced DVB-T2 system performance measurements in a flexible way. The platform is based on a software receiver with a boosted performance achieved by using both cluster computing and GPU processing. IQ samples of the received signals can be recorded in the lab or during field trials for offline analysis using this platform. This methodology has been tested both in the lab and in three different DVB-T2 measurement campaigns and the results obtained are analyzed in the last section of the paper.

ATSC 3.0 interleavers influence in reception performance

This paper presents the performance study of the interleavers defined in the ATSC 3.0 physical layer. It must be noted that for single PLP configurations convolutional time interleaving and frequency interleaving can be used. Nevertheless, when multiple PLP configurations are used, cell interleaving, block time interleaving, frequency interleaving and subslicing can also be included. The ATSC 3.0 interleavers influence on the reception performance will be tested in stationary, pedestrian and mobile scenarios. The main objective of this paper is to measure the required signal to noise ratio (SNR) threshold for an error-free reception with and without interleavers. In addition, each interleavers parameter configuration impact on the performance is also discussed. Consequently, each interleaver performance gain will be noted for each type of scenario. The obtained results will be useful for planning purposes.

Low complexity and high order two-dimensional non-uniform constellations for high capacity broadcasting systems

Non uniform constellations have been recently included in the new terrestrial broadcasting system ATSC 3.0, providing better performance than the uniform ones. However, for high order constellations, the complexity in the demapper grows as the number of constellation points do, being necessary to reduce the number of degrees of freedom in the constellation design process. The goal of this paper is to present a set of optimal high order non uniform constellations which provide higher gain than the ones proposed for the ATSC 3.0 system with low demapping complexity.

Cloud Transmission system performance in portable indoor environments

This paper presents some field trials carried out in Bilbao (Spain) for testing the feasibility of Cloud Transmission (Cloud-Txn) reception in fixed and pedestrian indoor scenarios. Therefore, the main objective of this study is to analyze the Cloud-Txn system coverage features so as to determine the optimum transmission power level to ensure a good coverage in indoor scenarios. The results will be useful for planning purposes in this kind of scenarios.