20 research outputs found

    The Implementation of a 2/4/8 Antennas Configurable Diversity OFDM Receiver for Mobile HDTV Application

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    Two pre-FFT adaptive array (AA) antenna combiners and a post-FFT carrier diversity (CD) combiner are integrated with a Japan Terrestrial digital TV (ISDB-T) OFDM receiver using 90鈥塶m 7M1P CMOS process. A 2/4/8-antenna diversity receiver can be configured and a low-cost 4 antenna diversity reception system can be realized in one LSI by making use of the AA-CD two-stage diversity combining method. Mobile reception performance is increased by 1.63 times using a denoise filter circuit and SPLINE interpolator under urban 6-path Rayleigh fading (TU6) model with 2-antenna post-FFT carrier diversity (2CD) combing mode. The die area is 49鈥塵m2 and the power consumption is 310鈥塵W

    Picture-Based Multiple-AntennaTechnique for the DVB-T2 Receiver

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    Deep-fading can decline the quality of the received signal to below threshold, and interrupts the reception-success (generating an outage or time-out). In DVB-T2 (Digital Video Broadcasting Terrestrial Second Generation) receiver, such interruption can be identified from the displayed-picture. Multiple-antenna is one of techniques to mitigate such problem. This paper presents a multiple-antenna method for receiving the DVB-T2 signal. At any time, one of antennas is selected where the selection action is controlled by the recovered-picture. In case of using two antennas, field-measurement was conducted to collect the real data, later used in the simulation of the proposed algorithm. The result showed its capability to increase the portion of cumulative reception-success duration up to approximately 1.53 times with respect to its equivalent single-antenna

    Architecture and algorithms for the implementation of digital wireless receivers in FPGA and ASIC: ISDB-T and DVB-S2 cases

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    [EN] The first generation of Terrestrial Digital Television(DTV) has been in service for over a decade. In 2013, several countries have already completed the transition from Analog to Digital TV Broadcasting, most of which in Europe. In South America, after several studies and trials, Brazil adopted the Japanese standard with some innovations. Japan and Brazil started Digital Terrestrial Television Broadcasting (DTTB) services in December 2003 and December 2007 respectively, using Integrated Services Digital Broadcasting - Terrestrial (ISDB-T), also known as ARIB STD-B31. In June 2005 the Committee for the Information Technology Area (CATI) of Brazilian Ministry of Science and Technology and Innovation MCTI approved the incorporation of the IC-Brazil Program, in the National Program for Microelectronics (PNM) . The main goals of IC-Brazil are the formal qualification of IC designers, support to the creation of semiconductors companies focused on projects of ICs within Brazil, and the attraction of semiconductors companies focused on the design and development of ICs in Brazil. The work presented in this thesis originated from the unique momentum created by the combination of the birth of Digital Television in Brazil and the creation of the IC-Brazil Program by the Brazilian government. Without this combination it would not have been possible to make these kind of projects in Brazil. These projects have been a long and costly journey, albeit scientifically and technologically worthy, towards a Brazilian DTV state-of-the-art low complexity Integrated Circuit, with good economy scale perspectives, due to the fact that at the beginning of this project ISDB-T standard was not adopted by several countries like DVB-T. During the development of the ISDB-T receiver proposed in this thesis, it was realized that due to the continental dimensions of Brazil, the DTTB would not be enough to cover the entire country with open DTV signal, specially for the case of remote localizations far from the high urban density regions. Then, Eldorado Research Institute and Idea! Electronic Systems, foresaw that, in a near future, there would be an open distribution system for high definition DTV over satellite, in Brazil. Based on that, it was decided by Eldorado Research Institute, that would be necessary to create a new ASIC for broadcast satellite reception. At that time DVB-S2 standard was the strongest candidate for that, and this assumption still stands nowadays. Therefore, it was decided to apply to a new round of resources funding from the MCTI - that was granted - in order to start the new project. This thesis discusses in details the Architecture and Algorithms proposed for the implementation of a low complexity Intermediate Frequency(IF) ISDB-T Receiver on Application Specific Integrated Circuit (ASIC) CMOS. The Architecture proposed here is highly based on the COordinate Rotation Digital Computer (CORDIC) Algorithm, that is a simple and efficient algorithm suitable for VLSI implementations. The receiver copes with the impairments inherent to wireless channels transmission and the receiver crystals. The thesis also discusses the Methodology adopted and presents the implementation results. The receiver performance is presented and compared to those obtained by means of simulations. Furthermore, the thesis also presents the Architecture and Algorithms for a DVB-S2 receiver targeting its ASIC implementation. However, unlike the ISDB-T receiver, only preliminary ASIC implementation results are introduced. This was mainly done in order to have an early estimation of die area to prove that the project in ASIC is economically viable, as well as to verify possible bugs in early stage. As in the case of ISDB-T receiver, this receiver is highly based on CORDIC algorithm and it was prototyped in FPGA. The Methodology used for the second receiver is derived from that used for the ISDB-T receiver, with minor additions given the project characteristics.[ES] La primera generaci贸n de Televisi贸n Digital Terrestre(DTV) ha estado en servicio por m谩s de una d茅cada. En 2013, varios pa铆ses completaron la transici贸n de transmisi贸n anal贸gica a televisi贸n digital, la mayor铆a de ellas en Europa. En Am茅rica del Sur, despu茅s de varios estudios y ensayos, Brasil adopt贸 el est谩ndar japon茅s con algunas innovaciones. Jap贸n y Brasil comenzaron a prestar el servicio de Difusi贸n de Televisi贸n Digital Terrestre (DTTB) en diciembre de 2003 y diciembre de 2007 respectivamente, utilizando Radiodifusi贸n Digital de Servicios Integrados Terrestres (ISDB-T), tambi茅n conocida como ARIB STD-B31. En junio de 2005, el Comit茅 del 脕rea de Tecnolog铆a de la Informaci贸n (CATI) del Ministerio de Ciencia, Tecnolog铆a e Innovaci贸n de Brasil - MCTI aprob贸 la incorporaci贸n del Programa CI-Brasil, en el Programa Nacional de Microelectr贸nica (PNM). Los principales objetivos de la CI-Brasil son la formaci贸n de dise帽adores de CIs, apoyar la creaci贸n de empresas de semiconductores enfocadas en proyectos de circuitos integrados dentro de Brasil, y la atracci贸n de empresas de semiconductores interesadas en el dise帽o y desarrollo de circuitos integrados. El trabajo presentado en esta tesis se origin贸 en el impulso 煤nico creado por la combinaci贸n del nacimiento de la televisi贸n digital en Brasil y la creaci贸n del Programa de CI-Brasil por el gobierno brasile帽o. Sin esta combinaci贸n no hubiera sido posible realizar este tipo de proyectos en Brasil. Estos proyectos han sido un trayecto largo y costoso, aunque meritorio desde el punto de vista cient铆fico y tecnol贸gico, hacia un Circuito Integrado brasile帽o de punta y de baja complejidad para DTV, con buenas perspectivas de econom铆a de escala debido al hecho que al inicio de este proyecto, el est谩ndar ISDB-T no fue adoptado por varios pa铆ses como DVB-T. Durante el desarrollo del receptor ISDB-T propuesto en esta tesis, se observ贸 que debido a las dimensiones continentales de Brasil, la DTTB no ser铆a suficiente para cubrir todo el pa铆s con la se帽al de televisi贸n digital abierta, especialmente para el caso de localizaciones remotas, apartadas de las regiones de alta densidad urbana. En ese momento, el Instituto de Investigaci贸n Eldorado e Idea! Sistemas Electr贸nicos, previeron que en un futuro cercano habr铆a un sistema de distribuci贸n abierto para DTV de alta definici贸n por sat茅lite en Brasil. Con base en eso, el Instituto de Investigaci贸n Eldorado decidi贸 que ser铆a necesario crear un nuevo ASIC para la recepci贸n de radiodifusi贸n por sat茅lite, basada el est谩ndar DVB-S2. En esta tesis se analiza en detalle la Arquitectura y algoritmos propuestos para la implementaci贸n de un receptor ISDB-T de baja complejidad y frecuencia intermedia (IF) en un Circuito Integrado de Aplicaci贸n Espec铆fica (ASIC) CMOS. La arquitectura aqu铆 propuesta se basa fuertemente en el algoritmo Computadora Digital para Rotaci贸n de Coordenadas (CORDIC), el cual es un algoritmo simple, eficiente y adecuado para implementaciones VLSI. El receptor hace frente a las deficiencias inherentes a las transmisiones por canales inal谩mbricos y los cristales del receptor. La tesis tambi茅n analiza la metodolog铆a adoptada y presenta los resultados de la implementaci贸n. Por otro lado, la tesis tambi茅n presenta la arquitectura y los algoritmos para un receptor DVB-S2 dirigido a la implementaci贸n en ASIC. Sin embargo, a diferencia del receptor ISDB-T, se introducen s贸lo los resultados preliminares de implementaci贸n en ASIC. Esto se hizo principalmente con el fin de tener una estimaci贸n temprana del 谩rea del die para demostrar que el proyecto en ASIC es econ贸micamente viable, as铆 como para verificar posibles errores en etapa temprana. Como en el caso de receptor ISDB-T, este receptor se basa fuertemente en el algoritmo CORDIC y fue un prototipado en FPGA. La metodolog铆a utilizada para el segundo receptor se deriva de la utilizada para el re[CA] La primera generaci贸 de Televisi贸 Digital Terrestre (TDT) ha estat en servici durant m茅s d'una d猫cada. En 2013, diversos pa茂sos ja van completar la transici贸 de la radiodifusi贸 de televisi贸 anal貌gica a la digital, i la majoria van ser a Europa. A Am猫rica del Sud, despr茅s de diversos estudis i assajos, Brasil va adoptar l'est脿ndard japon茅s amb algunes innovacions. Jap贸 i Brasil van comen莽ar els servicis de Radiodifusi贸 de Televisi贸 Terrestre Digital (DTTB) al desembre de 2003 i al desembre de 2007, respectivament, utilitzant la Radiodifusi贸 Digital amb Servicis Integrats de (ISDB-T), coneguda com a ARIB STD-B31. Al juny de 2005, el Comit茅 de l'脌rea de Tecnologia de la Informaci贸 (CATI) del Ministeri de Ci猫ncia i Tecnologia i Innovaci贸 del Brasil (MCTI) va aprovar la incorporaci贸 del programa CI Brasil al Programa Nacional de Microelectr貌nica (PNM). Els principals objectius de CI Brasil s贸n la qualificaci贸 formal dels dissenyadors de circuits integrats, el suport a la creaci贸 d'empreses de semiconductors centrades en projectes de circuits integrats dins del Brasil i l'atracci贸 d'empreses de semiconductors centrades en el disseny i desenvolupament de circuits integrats. El treball presentat en esta tesi es va originar en l'impuls 煤nic creat per la combinaci贸 del naixement de la televisi贸 digital al Brasil i la creaci贸 del programa Brasil CI pel govern brasiler. Sense esta combinaci贸 no hauria estat possible realitzar este tipus de projectes a Brasil. Estos projectes han suposat un viatge llarg i cost贸s, tot i que digne cient铆ficament i tecnol貌gica, cap a un circuit integrat punter de baixa complexitat per a la TDT brasilera, amb bones perspectives d'economia d'escala perqu猫 a l'inici d'este projecte l'est脿ndard ISDB-T no va ser adoptat per diversos pa茂sos, com el DVB-T. Durant el desenvolupament del receptor de ISDB-T proposat en esta tesi, va resultar que, a causa de les dimensions continentals de Brasil, la DTTB no seria suficient per cobrir tot el pa铆s amb el senyal de TDT oberta, especialment pel que fa a les localitzacions remotes allunyades de les regions d'alta densitat urbana.. En este moment, l'Institut de Recerca Eldorado i Idea! Sistemes Electr貌nics van preveure que, en un futur pr貌xim, no hi hauria a Brasil un sistema de distribuci贸 oberta de TDT d'alta definici贸 a trav茅s de sat猫l驴lit. D'acord amb aix貌, l'Institut de Recerca Eldorado va decidir que seria necessari crear un nou ASIC per a la recepci贸 de radiodifusi贸 per sat猫l驴lit. basat en l'est脿ndard DVB-S2. En esta tesi s'analitza en detall l'arquitectura i els algorismes proposats per l'execuci贸 d'un receptor ISDB-T de Freq眉猫ncia Interm猫dia (FI) de baixa complexitat sobre CMOS de Circuit Integrat d'Aplicacions Espec铆fiques (ASIC). L'arquitectura ac铆 proposada es basa molt en l'algorisme de l'Ordinador Digital de Rotaci贸 de Coordenades (CORDIC), que 茅s un algorisme simple i eficient adequat per implementacions VLSI. El receptor fa front a les defici猫ncies inherents a la transmissi贸 de canals sense fil i els cristalls del receptor. Esta tesi tamb茅 analitza la metodologia adoptada i presenta els resultats de l'execuci贸. Es presenta el rendiment del receptor i es compara amb els obtinguts per mitj脿 de simulacions. D'altra banda, esta tesi tamb茅 presenta l'arquitectura i els algorismes d'un receptor de DVB-S2 de cara a la seua implementaci贸 en ASIC. No obstant aix貌, a difer猫ncia del receptor ISDB-T, nom茅s s'introdueixen resultats preliminars d'implementaci贸 en ASIC. Aix貌 es va fer principalment amb la finalitat de tenir una estimaci贸 primerenca de la zona de dau per demostrar que el projecte en ASIC 茅s econ貌micament viable, aix铆 com per verificar possibles errors en l'etapa primerenca. Com en el cas del receptor ISDB-T, este receptor es basa molt en l'algorisme CORDIC i va ser un prototip de FPGA. La metodologia utilitzada per al segon receptor es deriva de la utilitzada per al receptor IRodrigues De Lima, E. (2016). Architecture and algorithms for the implementation of digital wireless receivers in FPGA and ASIC: ISDB-T and DVB-S2 cases [Tesis doctoral no publicada]. Universitat Polit猫cnica de Val猫ncia. https://doi.org/10.4995/Thesis/10251/61967TESI

    Combined Time, Frecuency and Space Diversity in Multimedia Mobile Broadcasting Systems

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    El uso combinado de diversidad en el dominio temporal, frecuencial y espacial constituye una valiosa herramienta para mejorar la recepci贸n de servicios de difusi贸n m贸viles. Gracias a la mejora conseguida por las t茅cnicas de diversidad es posible extender la cobertura de los servicios m贸viles adem谩s de reducir la infraestructura de red. La presente tesis investiga el uso de t茅cnicas de diversidad para la provisi贸n de servicios m贸viles en la familia europea de sistemas de difusi贸n terrestres estandarizada por el prpoyecto DVB (Digital Video Broadcasting). Esto incluye la primera y segunda generaci贸n de sistemas DVB-T (Terrestrial), DVB-NGH (Handheld), y DVB-T2 (Terrestrial 2nd generation), as铆 como el sistema de siguiente generaci贸n DVB-NGH. No obstante, el estudio llevado a cabo en la tesis es gen茅rico y puede aplicarse a futuras evoluciones de est谩ndares como el japon茅s ISDB-T o el americano ATSC. Las investigaciones realizadas dentro del contexto de DVB-T, DVB-H y DVBT2 tienen como objetivo la transmisi贸n simult谩nea de servicios fijos y m贸viles en redes terrestres. Esta Convergencia puede facilitar la introducci贸n de servicios m贸viles de TB debido a la reutilizaci贸n de espectro, contenido e infraestructura. De acuerdo a los resultados, la incorporaci贸n de entrelazado temporal en la capa f铆sica para diversidad temporal, y de single-input multiple-output (SIMO) para diversidad espacial, son esenciales para el rendimiento de sistemas m贸viles de difusi贸n. A pesar de que las t茅cnicas upper later FEC (UL-FEC) pueden propocionar diversidad temporal en sistemas de primera generaci贸n como DVB-T y DVB-H, requieren la transmisi贸n de paridad adicional y no son 煤tiles para la recepci贸n est谩tica. El an谩lisis en t锟矫眅rminos de link budjget revela que las t茅cnicas de diversidad noson suficientes para facilitar la provision de servicios m贸viles en redes DVB-T y DVB-T2 planificadas para recepci贸n fija. Sin embargo, el uso de diversidad en redes planificadas para recepci贸n portableGoz谩lvez Serrano, D. (2012). Combined Time, Frecuency and Space Diversity in Multimedia Mobile Broadcasting Systems [Tesis doctoral no publicada]. Universitat Polit猫cnica de Val猫ncia. https://doi.org/10.4995/Thesis/10251/16273Palanci

    Experimental Results of Network-Assisted Interference Suppression Scheme Using Adaptive Beam-Tilt Switching

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    This paper introduces a network-assisted interference suppression scheme using beam-tilt switching per frame for wireless local area network systems and its effectiveness in an actual indoor environment. In the proposed scheme, two access points simultaneously transmit to their own desired station by adjusting angle of beam-tilt including transmit power assisted from network server for the improvement of system throughput. In the conventional researches, it is widely known that beam-tilt is effective for ICI suppression in the outdoor scenario. However, the indoor effectiveness of beam-tilt for ICI suppression has not yet been indicated from the experimental evaluation. Thus, this paper indicates the effectiveness of the proposed scheme by analyzing multiple-input multiple-output channel matrices from experimental measurements in an office environment. The experimental results clearly show that the proposed scheme offers higher system throughput than the conventional scheme using just transmit power control

    Optical Communication

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    Optical communication is very much useful in telecommunication systems, data processing and networking. It consists of a transmitter that encodes a message into an optical signal, a channel that carries the signal to its desired destination, and a receiver that reproduces the message from the received optical signal. It presents up to date results on communication systems, along with the explanations of their relevance, from leading researchers in this field. The chapters cover general concepts of optical communication, components, systems, networks, signal processing and MIMO systems. In recent years, optical components and other enhanced signal processing functions are also considered in depth for optical communications systems. The researcher has also concentrated on optical devices, networking, signal processing, and MIMO systems and other enhanced functions for optical communication. This book is targeted at research, development and design engineers from the teams in manufacturing industry, academia and telecommunication industries

    Multiuser Parallel Transmission with 1-tap Time Domain Beamforming by Millimeter Wave Massive Antenna Arrays

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    This paper investigates the feasibility of multiuser parallel transmission by sub-array beamforming using millimeter wave bands in which the Line-of-Sight (LoS) dominant channel environment is expected. Focusing on high beamforming gain provided by the massive antenna array, each sub-array conducts first eigenmode transmission and thus one stream is allocated per user without null steering. This paper also proposes 1-tap time domain beamforming (TDBF) as the same weight is applied to all frequency components. It reduces computation complexity as well as suppressing the effect of additive noise on weight derivation. Computer simulation results show that increasing the subarray spacing stably improves signal-to-interference power ratio (SIR) performance and that the proposed 1-tap TDBF can match the performance of the frequency domain first eigenmode transmission as a rigorous solution

    A scalable real-time processing chain for radar exploiting illuminators of opportunity

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    Includes bibliographical references.This thesis details the design of a processing chain and system software for a commensal radar system, that is, a radar that makes use of illuminators of opportunity to provide the transmitted waveform. The stages of data acquisition from receiver back-end, direct path interference and clutter suppression, range/Doppler processing and target detection are described and targeted to general purpose commercial off-the-shelf computing hardware. A detailed low level design of such a processing chain for commensal radar which includes both processing stages and processing stage interactions has, to date, not been presented in the Literature. Furthermore, a novel deployment configuration for a networked multi-site FM broadcast band commensal radar system is presented in which the reference and surveillance channels are record at separate locations

    On Transmission System Design for Wireless Broadcasting

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    This thesis considers aspects related to the design and standardisation of transmission systems for wireless broadcasting, comprising terrestrial and mobile reception. The purpose is to identify which factors influence the technical decisions and what issues could be better considered in the design process in order to assess different use cases, service scenarios and end-user quality. Further, the necessity of cross-layer optimisation for efficient data transmission is emphasised and means to take this into consideration are suggested. The work is mainly related terrestrial and mobile digital video broadcasting systems but many of the findings can be generalised also to other transmission systems and design processes. The work has led to three main conclusions. First, it is discovered that there are no sufficiently accurate error criteria for measuring the subjective perceived audiovisual quality that could be utilised in transmission system design. Means for designing new error criteria for mobile TV (television) services are suggested and similar work related to other services is recommended. Second, it is suggested that in addition to commercial requirements there should be technical requirements setting the frame work for the design process of a new transmission system. The technical requirements should include the assessed reception conditions, technical quality of service and service functionalities. Reception conditions comprise radio channel models, receiver types and antenna types. Technical quality of service consists of bandwidth, timeliness and reliability. Of these, the thesis focuses on radio channel models and errorcriteria (reliability) as two of the most important design challenges and provides means to optimise transmission parameters based on these. Third, the thesis argues that the most favourable development for wireless broadcasting would be a single system suitable for all scenarios of wireless broadcasting. It is claimed that there are no major technical obstacles to achieve this and that the recently published second generation digital terrestrial television broadcasting system provides a good basis. The challenges and opportunities of a universal wireless broadcasting system are discussed mainly from technical but briefly also from commercial and regulatory aspectSiirretty Doriast

    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
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