An implementation on GNURadio of a new model to ISDB-Tb using FBMC

The modulation technique Filter Bank Multi Carrier (FBMC) is an alternative widely studied in order to replace Orthogonal Frequency Division Multiplexing (OFDM) in wireless telecommunications systems. The fact that FBMC does not use Cyclic Prefix and uses Polyphase Filters allows improvements in bit rate, bandwidth efficiency and robustness against multipath channel impairments. This implementation can bring advantages to Digital TV case in comparison to the traditional OFDM based systems because of the need to transmit higher resolution videos such as 4K and 8K. This article presents a study on the use of FBMC in Integrated System Digital Broadcasting Transmission B (ISDB-Tb), developing an application on GNURadio environment, analysing Bit Error Rate (BER) and power spectrum curves in a multipath channel

IEEE Transactions on Broadcasting Special Issue on: 5G for Broadband Multimedia Systems and Broadcasting

[EN] The upcoming fifth-generation ( 5G ) of wireless communications technologies is expected to revolutionize society digital transformation thanks to its unprecedented wireless performance capabilities, providing speeds of several Gbps, very low latencies well below 5 ms, ultra-reliable transmissions with up to 99.999% success probability, while being able to handle a huge number of devices simultaneously connected to the network. The first version of the 3GPP specification (i.e., Release 15) has been recently completed and many 5G trials are under plan or carrying out worldwide, with the first commercial deployments happening in 2019."© 2019 IEEE. Personal use of this material is permitted. Permissíon from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertisíng or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works."Gomez-Barquero, D.; Li, W.; Fuentes, M.; Xiong, J.; Araniti, G.; Akamine, C.; Wang, J. (2019). IEEE Transactions on Broadcasting Special Issue on: 5G for Broadband Multimedia Systems and Broadcasting. IEEE Transactions on Broadcasting. 65(2):351-355. https://doi.org/10.1109/TBC.2019.2914866S35135565

Analise de desempenho do sistema de TV digital DVB-T com entrelaçador temporal em canais com ruido impulsivo

Orientador : Yuzo IanoDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de ComputaçãoResumo: O objetivo deste trabalho é estudar o desempenho do sistema europeu de televisão digital terrestre DVB-T, quando implementado com um entrelaçador temporal semelhante ao utilizado no sistema japonês de televisão digital terrestre ISDB-T. Contribui-se com o desenvolvimento de um simulador denominado de DVB-T Modificado (DVBM-T). Para avaliar o desempenho do sistema DVBM-T, duas propostas de estimadores de canal (2D combinado com Cubic-Spline e 1D com Piecewice) foram testados. As simulações ocorreram em canais com ruído impulsivo, multipercurso, doppler, ruído gaussiano Branco e outros canais típicos de radiodifusão utilizados no Brasil para testes de sistemas de TV Digital Terrestre. Neste trabalho, ainda foram realizadas comparações entre resultados obtidos em receptores domésticos dos sistemas DVB-T e ISDB-T com a versão modificada do sistema DVB-T. Os resultados obtidos são apresentados e discutidosAbstract: The aim of this work is to study the performance of the European Terrestrial Digital TV system DVB-T, when improved with Time Interleaver similar to Japanese Terrestrial Digital TV System. We contribute with the development of a simulator named (DVBM-T) DVB Modified -T. To test the DVBM-T, two proposals of Channel Estimators (2D jointed with Cubic-Spline and 1D with Piecewice) were tested. The simulation tests were made in Channels with Impulsive Noise, Multipath, Doppler, White Gaussian Noise and otherstypical broadcast channels for Digital TV tests in Brazil. In this work, comparation between domestic receivers DVB-T and ISDB-T with the Modified DVB-T is also showed. The results achieved are presented and discussed.MestradoTelecomunicações e TelemáticaMestre em Engenharia Elétric

Contributions for distribution, modulation and demodulation of ISDB-TB digital TV system

Orientador : Yuzo IanoTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de ComputaçãoResumo: Este trabalho apresenta contribuições para o sistema brasileiro de TV digital. Considera-se a incompatibilidade do BTS (Broadcast Transport Stream) com os sistemas de distribuição de TV digital existentes e a dificuldade de implementação do modulador e demodulador ISDB-TB. Em primeiro lugar um algoritmo inovador capaz de realizar a compressão e adaptação do BTS tomando-o compatível com a maioria dos equipamentos comerciais do sistema DVB, é proposto. Em seguida, um detalhamento do funcionamento do modulador e demodulador é realizado utilizando-se expressões matemáticas e resultados obtidos em simulações computacionais. A partir do BTS, foi desenvolvido um simulador do modulador capaz de monitorar a entrada e saída de todos os blocos de processamento. No último estágio, vetores de RF são criados e podem ser utilizados em simulações computacionais e geradores de forma de onda arbitrária. Utilizando vetores de RF de emissoras de TV, foi desenvolvido um simulador do demodulador ISDB-TB. Esse simulador realiza as operações de sincronismo, estimação de canal, demodulação e decodificação de canal. Além disso, monitores da relação sinal ruído, constelação, resposta em frequência, perfil de atraso e taxa de erro de bits são utilizados para monitorar a reconstrução do BTSAbstract: This paper presents contributions to the Brazilian digital TV system. It considers the incompatibility of (BTS) Broadcast Transport Stream with the existing digital TV distribution systems. The difficulty of implementation of the ISDB-TB modulator and demodulator are also taken into account. Firstly, an innovative algorithm able to compress and adapt the BTS in order to make it compatible with most DVB commercial equipment is implemented. Then, the detailed operation of the modulator and emodulator are obtained sing mathematical expressions and results from computer simulations. Using the BTS, it has been developed a simulator capable of monitoring the modulation input and output of all processing blocks. In the last stage, the RF vectors are created and can be used on computer simulations and arbitrary waveform generators. Using RF vectors of TV stations, an ISDB-Ts demodulator simulator was developed. This simulator performs the operations of synchronization, channel estimation, demodulation and channel decoding. In addition, monitors of signal to noise ratio, constellation, frequency response, delay profile and bit error rate are used to monitor the reconstruction of the BTSDoutoradoTelecomunicações e TelemáticaDoutor em Engenharia Elétric

Neural network channel estimator for time‐variant frequency‐selective fading channels

Abstract The next generations of wireless communications systems are pushing the limits of the channel estimation methods utilized in the orthogonal frequency division multiplexing receptors. This letter proposes a novel channel estimation method using a densely connected neural network considering the time‐variant frequency‐selective fading channel model. A fully connected deep neural network for the AWGN channel case is also proposed. The comparative complexity of the estimation for different channel models is also discussed. The simulation results demonstrate that the densely connected neural network method surpasses the minimum mean‐square error method performance for a signal‐to‐noise ratio ranging from 0 to 25 dB in the frequency‐selective channel

Deterministic Chaotic Propagation Model

Coverage prediction is an essential method of planning broadcast and long-range wireless communication systems, minimizing the need for field measurements to adjust the coverage area and consequently reducing the time and cost of implementation. Coverage prediction methods use statistical simplifications in conjunction to uncertainty quantification algorithms to assist in modeling multipath effects and impulsive noise, notably hard to be statistically considered. This paper presents a new approach to represent electromagnetic wave propagation uncertainties based on chaotic dynamical systems to model the behavior of multipath effect and impulsive noise. A novel Deterministic Chaotic Propagation Model (DCPM) is presented and used to predict coverage area in a DVB-T2 broadcast system in diverse transmission environments. The results indicate that the predicted area of bad reception is smaller in comparison to the one obtained using traditional methods. Therefore, fewer signal repeaters can be used to provide good TV reception in this area, causing a significant cost reduction in the set-up of a broadcast system. Another parameter used to evaluate the quality of reception is the carrier to noise power ratio (C/N) threshold for a bit error rate (BER) of 10-7. The DCPM indicate a C/N threshold equal to 13.7 dB in dense urban environment and 13.4 dB in rural environment using a moderately less robust modulation configuration. Employing a more robust configuration, the C/N threshold is equal to 0.9 dB in all environments. These numbers match the obtained by the traditional propagation models

Handheld Digital TV Performance Evaluation Method

This paper presents a simplified method for signal level clearance evaluation in each place of signal reception up to threshold for a given portable TV receiver device. It describes briefly the structure of transmission system considering the “1Seg” structure of ISDB-T. The preliminary laboratory test was made before the field tests to verify the main features of handheld receiver

MÉtodo De RemultiplexaÇÃo De Sinais Isdb-t Para DistribuiÇÃo De Sinais De TelevisÃo Usando PadrÃo Dvb

MÉTODO DE REMULTIPLEXAÇÃO DE SINAIS ISDB-T PARA DISTRIBUIÇÃO DE SINAIS DE TELEVISÃO USANDO PADRÃO DVB. O presente invento se trata de um método que realiza de forma simples a conversão entre pacotes de transporte ISDB-T de 204 bytes e pacotes de transporte DVB de 188 bytes (tanto do primeiro para o segundo quanto vice-versa) sem perda de informação, através de um processo de remultiplexação. Esta conversão é realizada através-da-inclusão de um módulo de remultiplexação para o ISDB-T tanto no transmissor quanto no multiplexador, tornando possível a distribuição do BTS (Broadcasting Transport Stream), economizando banda e permitindo a construção de SFN (Single Frequency network) mais amplas e com menor taxa de bits do que o BIS original, o que se traduz em redução de custos de transmissão como, por exemplo, no aluguel do canal de satélite por parte dos radiodifusores, tais como, por exemplo, Redes Públicas, Rede Globo, Record, Bandeirantes, etc. Dentre as aplicações beneficiadas em MFN (Multi Frequency network) e SFN estão a distribuição de TV via satélite, cabo (-C), fibra-ótica, radiodifusão direta terrestre (-T), sistemas de telecomunicações, enlace de microondas, satélite(-S), entre outros.BRPI1001786 (A2)H04H20/02H04H20/26BR2010PI01786H04H20/02H04H20/2