19 research outputs found

    Reception performance studies for the evaluation and improvement of the new generation terrestrial television systems

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    270 p.La industria de la TV ha experimentado grandes cambios en las 煤ltimas d茅cadas. Las expectativas cada vez mayores de los espectadores y la reducci贸n del espectro disponible para los servicios de TV han provocado la necesidad de sistemas m谩s robustos de Televisi贸n Digital Terrestre (TDT).El primer intento de cumplir estos requisitos es el est谩ndar europeo DVB-T2 (2009). La publicaci贸n de un nuevo est谩ndar significa el inicio de un proceso de evaluaci贸n del rendimiento del mismo mediante, por ejemplo, estudios de cobertura u obtenci贸n de valores de umbral de relaci贸n se帽al / ruido (SNR). Al inicio de esta tesis, este proceso estaba casi terminado para recepci贸n fija y m贸vil. Sin embargo, la recepci贸n en interiores no se hab铆a estudiado en detalle. Por esta raz贸n, esta tesis completa la evaluaci贸n de DVB-T2 en interiores y define una nueva metodolog铆a de evaluaci贸n optimizada para este escenario.A pesar de que DVB-T2 emplea tecnolog铆as muy avanzadas, el sistema se defini贸 hace casi diez a帽os y desde entonces han aparecido nuevas t茅cnicas avanzadas, como por ejemplo nuevos c贸digos de correcci贸n de errores o la nueva t茅cnica de multiplexaci贸n por divisi贸n en capas (LDM). Estas nuevas t茅cnicas tampoco han sido evaluadas en entornos de interior, por lo que esta tesis incluye el an谩lisis de las mismas evaluando su idoneidad para mejorar el rendimiento de DVB-T2. Adem谩s, se ha comprobado que los algoritmos tradicionales de los receptores TDT no est谩n optimizados para los nuevos escenarios en los que se consideran las se帽ales multicapa y recepci贸n m贸vil. Por esta raz贸n, se han propuesto nuevos algoritmos para mejorar la recepci贸n en este tipo de situaciones.El 煤ltimo intento de hacer frente a los altos requisitos actuales de TDT es el est谩ndar americano ATSC 3.0 (2016). Al igual que con DVB-T2, se necesita proceso completo de evaluaci贸n del sistema. Por ello, en esta tesis se han realizado simulaciones y pruebas de laboratorio para completar el estudio de rendimiento de ATSC 3.0 en diferentes escenarios

    An Overview of the ATSC 3.0 Physical Layer Specification

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    "(c) 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.")This paper provides an overview of the physical layer specification of Advanced Television Systems Committee (ATSC) 3.0, the next-generation digital terrestrial broadcasting standard. ATSC 3.0 does not have any backwards-compatibility constraint with existing ATSC standards, and it uses orthogonal frequency division multiplexing-based waveforms along with powerful low-density parity check (LDPC) forward error correction codes similar to existing state-of-the-art. However, it introduces many new technological features such as 2-D non-uniform constellations, improved and ultra-robust LDPC codes, power-based layered division multiplexing to efficiently provide mobile and fixed services in the same radio frequency (RF) channel, as well as a novel frequency pre-distortion multiple-input single-output antenna scheme. ATSC 3.0 also allows bonding of two RF channels to increase the service peak data rate and to exploit inter-RF channel frequency diversity, and to employ dual-polarized multiple-input multiple-output antenna system. Furthermore, ATSC 3.0 provides great flexibility in terms of configuration parameters (e.g., 12 coding rates, 6 modulation orders, 16 pilot patterns, 12 guard intervals, and 2 time interleavers), and also a very flexible data multiplexing scheme using time, frequency, and power dimensions. As a consequence, ATSC 3.0 not only improves the spectral efficiency and robustness well beyond the first generation ATSC broadcast television standard, but also it is positioned to become the reference terrestrial broadcasting technology worldwide due to its unprecedented performance and flexibility. Another key aspect of ATSC 3.0 is its extensible signaling, which will allow including new technologies in the future without disrupting ATSC 3.0 services. This paper provides an overview of the physical layer technologies of ATSC 3.0, covering the ATSC A/321 standard that describes the so-called bootstrap, which is the universal entry point to an ATSC 3.0 signal, and the ATSC A/322 standard that describes the physical layer downlink signals after the bootstrap. A summary comparison between ATSC 3.0 and DVB-T2 is also provided.Fay, L.; Michael, L.; G贸mez Barquero, D.; Ammar, N.; Caldwell, MW. (2016). An Overview of the ATSC 3.0 Physical Layer Specification. IEEE Transactions on Broadcasting. 62(1):159-171. doi:10.1109/TBC.2015.2505417S15917162

    Layered Division Multiplexing With Multi-Radio-Frequency Channel Technologies

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    "(c) 2015 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.")The advanced television system committee (ATSC) is to release the next-generation U.S. digital terrestrial television standard, known as ATSC 3.0. Layered division multiplexing (LDM) is one of the new physical layer technologies included in the standard, which enables the efficient provision of mobile and fixed services by superposing two independent signals with different power levels. ATSC 3.0 has also adopted a novel transmission technique known as channel bonding (CB), which splits the data of a service into two sub-streams that are modulated and transmitted over two radio-frequency (RF) channels. This paper investigates the potential use cases, implementation aspects, and performance advantages, for combining LDM with CB and also with the multi-RF channel technology time frequency slicing (TFS) introduced in digital video broadcasting - terrestrial second generation (DVB-T2) (as an informative annex) and digital video broadcasting - next generation handheld (DVB-NGH) which allows distributing the data of a service across two or more RF channels by means of time slicing and frequency hopping.Parts of this paper have been published in the Proceedings of the IEEE International Symposium on Broadband Multimedia Systems and Broadcasting, Ghent, Belgium, in 2015. This work was supported by the ICT Research and Development Program of MSIP/IITP. [R0101-15-294, Development of Service and Transmission Technology for Convergent Realistic Broadcast.]Garro Crevill茅n, E.; Gimenez Gandia, JJ.; Park, SI.; G贸mez Barquero, D. (2016). Layered Division Multiplexing With Multi-Radio-Frequency Channel Technologies. IEEE Transactions on Broadcasting. 62(2):365-374. doi:10.1109/TBC.2015.2492474S36537462

    Reception performance studies for the evaluation and improvement of the new generation terrestrial television systems

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    270 p.La industria de la TV ha experimentado grandes cambios en las 煤ltimas d茅cadas. Las expectativas cada vez mayores de los espectadores y la reducci贸n del espectro disponible para los servicios de TV han provocado la necesidad de sistemas m谩s robustos de Televisi贸n Digital Terrestre (TDT).El primer intento de cumplir estos requisitos es el est谩ndar europeo DVB-T2 (2009). La publicaci贸n de un nuevo est谩ndar significa el inicio de un proceso de evaluaci贸n del rendimiento del mismo mediante, por ejemplo, estudios de cobertura u obtenci贸n de valores de umbral de relaci贸n se帽al / ruido (SNR). Al inicio de esta tesis, este proceso estaba casi terminado para recepci贸n fija y m贸vil. Sin embargo, la recepci贸n en interiores no se hab铆a estudiado en detalle. Por esta raz贸n, esta tesis completa la evaluaci贸n de DVB-T2 en interiores y define una nueva metodolog铆a de evaluaci贸n optimizada para este escenario.A pesar de que DVB-T2 emplea tecnolog铆as muy avanzadas, el sistema se defini贸 hace casi diez a帽os y desde entonces han aparecido nuevas t茅cnicas avanzadas, como por ejemplo nuevos c贸digos de correcci贸n de errores o la nueva t茅cnica de multiplexaci贸n por divisi贸n en capas (LDM). Estas nuevas t茅cnicas tampoco han sido evaluadas en entornos de interior, por lo que esta tesis incluye el an谩lisis de las mismas evaluando su idoneidad para mejorar el rendimiento de DVB-T2. Adem谩s, se ha comprobado que los algoritmos tradicionales de los receptores TDT no est谩n optimizados para los nuevos escenarios en los que se consideran las se帽ales multicapa y recepci贸n m贸vil. Por esta raz贸n, se han propuesto nuevos algoritmos para mejorar la recepci贸n en este tipo de situaciones.El 煤ltimo intento de hacer frente a los altos requisitos actuales de TDT es el est谩ndar americano ATSC 3.0 (2016). Al igual que con DVB-T2, se necesita proceso completo de evaluaci贸n del sistema. Por ello, en esta tesis se han realizado simulaciones y pruebas de laboratorio para completar el estudio de rendimiento de ATSC 3.0 en diferentes escenarios

    Single-Frequency Network Terrestrial Broadcasting with 5GNR Numerology

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    L'abstract 猫 presente nell'allegato / the abstract is in the attachmen

    Potentzia domeinuko NOMA 5G sareetarako eta haratago

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    Tesis ingl茅s 268 p. -- Tesis euskera 274 p.During the last decade, the amount of data carried over wireless networks has grown exponentially. Several reasons have led to this situation, but the most influential ones are the massive deployment of devices connected to the network and the constant evolution in the services offered. In this context, 5G targets the correct implementation of every application integrated into the use cases. Nevertheless, the biggest challenge to make ITU-R defined cases (eMBB, URLLC and mMTC) a reality is the improvement in spectral efficiency. Therefore, in this thesis, a combination of two mechanisms is proposed to improve spectral efficiency: Non-Orthogonal Multiple Access (NOMA) techniques and Radio Resource Management (RRM) schemes. Specifically, NOMA transmits simultaneously several layered data flows so that the whole bandwidth is used throughout the entire time to deliver more than one service simultaneously. Then, RRM schemes provide efficient management and distribution of radio resources among network users. Although NOMA techniques and RRM schemes can be very advantageous in all use cases, this thesis focuses on making contributions in eMBB and URLLC environments and proposing solutions to communications that are expected to be relevant in 6G

    Advanced constellation and demapper schemes for next generation digital terrestrial television broadcasting systems

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    206 p.Esta tesis presenta un nuevo tipo de constelaciones llamadas no uniformes. Estos esquemas presentan una eficacia de hasta 1,8 dB superior a las utilizadas en los 煤ltimos sistemas de comunicaciones de televisi贸n digital terrestre y son extrapolables a cualquier otro sistema de comunicaciones (sat茅lite, m贸vil, cable驴). Adem谩s, este trabajo contribuye al dise帽o de constelaciones con una nueva metodolog铆a que reduce el tiempo de optimizaci贸n de d铆as/horas (metodolog铆as actuales) a horas/minutos con la misma eficiencia. Todas las constelaciones dise帽adas se testean bajo una plataforma creada en esta tesis que simula el est谩ndar de radiodifusi贸n terrestre m谩s avanzado hasta la fecha (ATSC 3.0) bajo condiciones reales de funcionamiento.Por otro lado, para disminuir la latencia de decodificaci贸n de estas constelaciones esta tesis propone dos t茅cnicas de detecci贸n/demapeo. Una es para constelaciones no uniformes de dos dimensiones la cual disminuye hasta en un 99,7% la complejidad del demapeo sin empeorar el funcionamiento del sistema. La segunda t茅cnica de detecci贸n se centra en las constelaciones no uniformes de una dimensi贸n y presenta hasta un 87,5% de reducci贸n de la complejidad del receptor sin p茅rdidas en el rendimiento.Por 煤ltimo, este trabajo expone un completo estado del arte sobre tipos de constelaciones, modelos de sistema, y dise帽o/demapeo de constelaciones. Este estudio es el primero realizado en este campo

    Transmit and Receive Signal Processing for MIMO Terrestrial Broadcast Systems

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    [EN] Multiple-Input Multiple-Output (MIMO) technology in Digital Terrestrial Television (DTT) networks has the potential to increase the spectral efficiency and improve network coverage to cope with the competition of limited spectrum use (e.g., assignment of digital dividend and spectrum demands of mobile broadband), the appearance of new high data rate services (e.g., ultra-high definition TV - UHDTV), and the ubiquity of the content (e.g., fixed, portable, and mobile). It is widely recognised that MIMO can provide multiple benefits such as additional receive power due to array gain, higher resilience against signal outages due to spatial diversity, and higher data rates due to the spatial multiplexing gain of the MIMO channel. These benefits can be achieved without additional transmit power nor additional bandwidth, but normally come at the expense of a higher system complexity at the transmitter and receiver ends. The final system performance gains due to the use of MIMO directly depend on physical characteristics of the propagation environment such as spatial correlation, antenna orientation, and/or power imbalances experienced at the transmit aerials. Additionally, due to complexity constraints and finite-precision arithmetic at the receivers, it is crucial for the overall system performance to carefully design specific signal processing algorithms. This dissertation focuses on transmit and received signal processing for DTT systems using MIMO-BICM (Bit-Interleaved Coded Modulation) without feedback channel to the transmitter from the receiver terminals. At the transmitter side, this thesis presents investigations on MIMO precoding in DTT systems to overcome system degradations due to different channel conditions. At the receiver side, the focus is given on design and evaluation of practical MIMO-BICM receivers based on quantized information and its impact in both the in-chip memory size and system performance. These investigations are carried within the standardization process of DVB-NGH (Digital Video Broadcasting - Next Generation Handheld) the handheld evolution of DVB-T2 (Terrestrial - Second Generation), and ATSC 3.0 (Advanced Television Systems Committee - Third Generation), which incorporate MIMO-BICM as key technology to overcome the Shannon limit of single antenna communications. Nonetheless, this dissertation employs a generic approach in the design, analysis and evaluations, hence, the results and ideas can be applied to other wireless broadcast communication systems using MIMO-BICM.[ES] La tecnolog铆a de m煤ltiples entradas y m煤ltiples salidas (MIMO) en redes de Televisi贸n Digital Terrestre (TDT) tiene el potencial de incrementar la eficiencia espectral y mejorar la cobertura de red para afrontar las demandas de uso del escaso espectro electromagn茅tico (e.g., designaci贸n del dividendo digital y la demanda de espectro por parte de las redes de comunicaciones m贸viles), la aparici贸n de nuevos contenidos de alta tasa de datos (e.g., ultra-high definition TV - UHDTV) y la ubicuidad del contenido (e.g., fijo, portable y m贸vil). Es ampliamente reconocido que MIMO puede proporcionar m煤ltiples beneficios como: potencia recibida adicional gracias a las ganancias de array, mayor robustez contra desvanecimientos de la se帽al gracias a la diversidad espacial y mayores tasas de transmisi贸n gracias a la ganancia por multiplexado del canal MIMO. Estos beneficios se pueden conseguir sin incrementar la potencia transmitida ni el ancho de banda, pero normalmente se obtienen a expensas de una mayor complejidad del sistema tanto en el transmisor como en el receptor. Las ganancias de rendimiento finales debido al uso de MIMO dependen directamente de las caracter铆sticas f铆sicas del entorno de propagaci贸n como: la correlaci贸n entre los canales espaciales, la orientaci贸n de las antenas y/o los desbalances de potencia sufridos en las antenas transmisoras. Adicionalmente, debido a restricciones en la complejidad y aritm茅tica de precisi贸n finita en los receptores, es fundamental para el rendimiento global del sistema un dise帽o cuidadoso de algoritmos espec铆ficos de procesado de se帽al. Esta tesis doctoral se centra en el procesado de se帽al, tanto en el transmisor como en el receptor, para sistemas TDT que implementan MIMO-BICM (Bit-Interleaved Coded Modulation) sin canal de retorno hacia el transmisor desde los receptores. En el transmisor esta tesis presenta investigaciones en precoding MIMO en sistemas TDT para superar las degradaciones del sistema debidas a diferentes condiciones del canal. En el receptor se presta especial atenci贸n al dise帽o y evaluaci贸n de receptores pr谩cticos MIMO-BICM basados en informaci贸n cuantificada y a su impacto tanto en la memoria del chip como en el rendimiento del sistema. Estas investigaciones se llevan a cabo en el contexto de estandarizaci贸n de DVB-NGH (Digital Video Broadcasting - Next Generation Handheld), la evoluci贸n port谩til de DVB-T2 (Second Generation Terrestrial), y ATSC 3.0 (Advanced Television Systems Commitee - Third Generation) que incorporan MIMO-BICM como clave tecnol贸gica para superar el l铆mite de Shannon para comunicaciones con una 煤nica antena. No obstante, esta tesis doctoral emplea un m茅todo gen茅rico tanto para el dise帽o, an谩lisis y evaluaci贸n, por lo que los resultados e ideas pueden ser aplicados a otros sistemas de comunicaci贸n inal谩mbricos que empleen MIMO-BICM.[CA] La tecnologia de m煤ltiples entrades i m煤ltiples eixides (MIMO) en xarxes de Televisi贸 Digital Terrestre (TDT) t茅 el potencial d'incrementar l'efici猫ncia espectral i millorar la cobertura de xarxa per a afrontar les demandes d'煤s de l'esc脿s espectre electromagn猫tic (e.g., designaci贸 del dividend digital i la demanda d'espectre per part de les xarxes de comunicacions m貌bils), l'aparici贸 de nous continguts d'alta taxa de dades (e.g., ultra-high deffinition TV - UHDTV) i la ubiq眉itat del contingut (e.g., fix, port脿til i m貌bil). 脡s 脿mpliament reconegut que MIMO pot proporcionar m煤ltiples beneficis com: pot猫ncia rebuda addicional gr脿cies als guanys de array, major robustesa contra esva茂ments del senyal gr脿cies a la diversitat espacial i majors taxes de transmissi贸 gr脿cies al guany per multiplexat del canal MIMO. Aquests beneficis es poden aconseguir sense incrementar la pot猫ncia transmesa ni l'ample de banda, per貌 normalment s'obtenen a costa d'una major complexitat del sistema tant en el transmissor com en el receptor. Els guanys de rendiment finals a causa de l'煤s de MIMO depenen directament de les caracter铆stiques f铆siques de l'entorn de propagaci贸 com: la correlaci贸 entre els canals espacials, l'orientaci贸 de les antenes, i/o els desequilibris de pot猫ncia patits en les antenes transmissores. Addicionalment, a causa de restriccions en la complexitat i aritm猫tica de precisi贸 finita en els receptors, 茅s fonamental per al rendiment global del sistema un disseny acurat d'algorismes espec铆fics de processament de senyal. Aquesta tesi doctoral se centra en el processament de senyal tant en el transmissor com en el receptor per a sistemes TDT que implementen MIMO-BICM (Bit-Interleaved Coded Modulation) sense canal de tornada cap al transmissor des dels receptors. En el transmissor aquesta tesi presenta recerques en precoding MIMO en sistemes TDT per a superar les degradacions del sistema degudes a diferents condicions del canal. En el receptor es presta especial atenci贸 al disseny i avaluaci贸 de receptors pr脿ctics MIMO-BICM basats en informaci贸 quantificada i al seu impacte tant en la mem貌ria del xip com en el rendiment del sistema. Aquestes recerques es duen a terme en el context d'estandarditzaci贸 de DVB-NGH (Digital Video Broadcasting - Next Generation Handheld), l'evoluci贸 port脿til de DVB-T2 (Second Generation Terrestrial), i ATSC 3.0 (Advanced Television Systems Commitee - Third Generation) que incorporen MIMO-BICM com a clau tecnol貌gica per a superar el l铆mit de Shannon per a comunicacions amb una 煤nica antena. No obstant a莽貌, aquesta tesi doctoral empra un m猫tode gen猫ric tant per al disseny, an脿lisi i avaluaci贸, per la qual cosa els resultats i idees poden ser aplicats a altres sistemes de comunicaci贸 sense fils que empren MIMO-BICM.Vargas Paredero, DE. (2016). Transmit and Receive Signal Processing for MIMO Terrestrial Broadcast Systems [Tesis doctoral no publicada]. Universitat Polit猫cnica de Val猫ncia. https://doi.org/10.4995/Thesis/10251/66081TESISPremiad

    NOMA-based 802.11g/n: PHY analysis and MAC implementation

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    Industry 4.0 can be considered as the industrial revolution of the current century. Among others, one of its main objectives is the replacement of wired communications by wireless connectivity. The idea is to overcome the main drawbacks of the current wired ecosystem: the lack of mobility, the deployment costs, cable damage and the difficulties with scalability. However, for this purpose, the nature and requirements of the industrial applications must be taken into account, in particular, the proposed communications protocols must support very low loss rates and a strong robustness against failures. This is a very challenging condition due to the nature of the industrial environments (interference with other communication systems, reflections with metallic objects ...). In addition, another characteristic of the industrial applications is the strict requirement related to the latency. On the other hand, industrial applications are not only based on high challenging services, but also exist more flexible requirement applications, such as, web browser, email, video content or complementary information. Those services are considered Best Effort (BE) services. Eventually, in some wireless applications both critical and BE services have to be offered. For those cases, Non-Orthogonal Multiplexing Access (NOMA) technology together with the IEEE 802.11g/n standard is proposed in this document as the physical layer solution. The IEEE 802.11g/n standard has been modified in order to accommodate NOMA schemes, and then, comprehensive simulations are conducted to check and analyze the behavior of the proposed system. It has been determined that through NOMA technology it is possible to obtain better results in certain cases than those achieved in a transmission cases that implements the IEEE 802.11g/n standard in TDM/FDM basis

    5G New Radio for Terrestrial Broadcast: A Forward-Looking Approach for NR-MBMS

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    "漏 2019 IEEE. Personal use of this material is permitted. Permiss铆on from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertis铆ng 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."[EN] 3GPP LTE eMBMS release (Rel-) 14, also referred to as further evolved multimedia broadcast multicast service (FeMBMS) or enhanced TV (EnTV), is the first mobile broadband technology standard to incorporate a transmission mode designed to deliver terrestrial broadcast services from conventional high power high tower (HPHT) broadcast infrastructure. With respect to the physical layer, the main improvements in FeMBMS are the support of larger inter-site distance for single frequency networks (SFNs) and the ability to allocate 100% of a carrier's resources to the broadcast payload, with self-contained signaling in the downlink. From the system architecture perspective, a receive-only mode enables free-to-air (FTA) reception with no need for an uplink or SIM card, thus receiving content without user equipment registration with a network. These functionalities are only available in the LTE advanced pro specifications as 5G new radio (NR), standardized in 3GPP from Rel-15, has so far focused entirely on unicast. This paper outlines a physical layer design for NR-MBMS, a system derived, with minor modifications, from the 5G-NR specifications, and suitable for the transmission of linear TV and radio services in either single-cell or SFN operation. This paper evaluates the NR-MBMS proposition and compares it to LTE-based FeMBMS in terms of flexibility, performance, capacity, and coverage.This work was supported in part by the European Commission through the 5G-PPP Project 5G-Xcast (H2020-ICT-2016-2 call) under Grant 761498.Gimenez, JJ.; Carcel, JL.; Fuentes, M.; Garro, E.; Elliott, S.; Vargas, D.; Menzel, C.... (2019). 5G New Radio for Terrestrial Broadcast: A Forward-Looking Approach for NR-MBMS. IEEE Transactions on Broadcasting. 65(2):356-368. https://doi.org/10.1109/TBC.2019.291211735636865
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