The notion of platform based design is considered as a viable solution to boost the design productivity by favouring reuse design methodology. With the scaling down of device feature size and scaling up of design complexity, throughput limitations, signal integrity and signal latency are becoming a bottleneck in future communication centric System-on-Chip (SoC) design. This has given birth to communication centric platform based designs. Development of heterogeneous multi-core architectures has caused the on-chip communication medium tailored for a specific application domain to deal with multidomain traffic patterns. This makes the current application specific communication centric platforms unsuitable for future SoC architectures. The work presented in this thesis, endeavours to explore the current communication media to establish the expectations from future on-chip interconnects. A novel communication centric platform based design flow is proposed, which consists of four communication centric platforms that are based on shared global bus, hierarchical bus, crossbars and a novel hybrid communication medium. Developed with a smart platform controller, the platforms support Open Core Protocol (OCP) socket standard, allowing cores to integrate in a plug and play fashion without the need to reprogram the pre-verified platforms. This drastically reduces the design time of SoC architectures. Each communication centric platform has different throughput, area and power characteristics, thus, depending on the design constraints, processing cores can be integrated to the most appropriate communication platform to realise the desired SoC architecture. A novel hybrid communication medium is also developed in this thesis, which combines the advantages of two different types of communication media in a single SoC architecture. The hybrid communication medium consists of crossbar matrix and shared bus medium . Simulation results and implementation of WiMAX receiver as a real-life example shows a 65% increase in data throughput than shared bus based communication medium, 13% decrease in area and 11% decrease in power than crossbar based communication medium. In order to automate the generation of SoC architectures with optimised communication architectures, a tool called SOCCAD (SoC Communication architecture development) is developed. Components needed for the realisation of the given application can be selected from the tool’s in-built library. Offering an optimised communication centric placement, the tool generates the complete SystemC code for the system with different interconnect architectures, along with its power and area characteristics. The generated SystemC code can be used for quick simulation and coupled with efficient test benches can be used for quick verification. Network-on-Chip (NoC) is considered as a solution to the communication bottleneck in future SoC architectures with data throughput requirements of over 10GB/s. It aims to provide low power, efficient link utilisation, reduced data contention and reduced area on silicon. Current on-chip networks, developed with fixed architectural parameters, do not utilise the available resources efficiently. To increase this efficiency, a novel dynamically reconfigurable NoC (drNoC) is developed in this thesis. The proposed drNoC reconfigures itself in terms of switching, routing and packet size with the changing communication requirements of the system at run time, thus utilising the maximum available channel bandwidth. In order to increase the applicability of drNoC, the network interface is designed to support OCP socket standard. This makes drNoC a highly reuseable communication framework, qualifying it as a communication centric platform for high data intensive SoC architectures. Simulation results show a 32% increase in data throughput and 22-35% decrease in network delay when compared with a traditional NoC with fixed parameters.

In this dissertation, the transformer management system has been developed to monitor transformer over loading and generate warning message in conduit mapping management system (CMMS) of Taipower company. The transformer over loading prediction is performed by both offline and online modes. Performs the transformer loading estimation by using the customer monthly energy consumption in customer information system (CIS) and the connectivity attributes of transformer and customers served in CMMS system of Taipower company. The daily load curve of distribution transformer is derived considering the typical daily load patterns which have been developed in load survey study. The warning message will be generated when the peak loading estimated is lager then the transformer rated capacity. To enhance the accuracy of transformer attributes in CMMS system, the transformer phasing measurement system (TPMS) and the connectivity identification system to identify all of the customers served by each transformer are developed. It is difficult to receive the 1 pulse per second signal form global positioning system for timing synchronization of TPMS measuring units for phasing measurement of transformers located in basement, the temperature compensated crystal oscillation with Fuzzy calibration algorithm is used to maintain the timing synchronization within 10o deviation for measurement period of 2 hours. To solve the incorrect problem of transformer and customer connectivity in CMMS, the power line carrier technology is applied in the design of connectivity measurement system for the identification of customers served by the transformer. The peak loading of transformer is estimated by including the temperature effect and the overloading flag of transformer is displayed on the CMMS automatic mapping system. For the online TLM system, the embedded transformer terminal unit is developed for the real time measurement of transformer loading and insulation oil temperature. For the transformer with abnormal operation condition, the alarm signals will be generated and transmitted to the TLM master station via hybrid communication system for the activation of demand response function to execute the load shedding control of customer loads.

Submitted by Geandra Rodrigues (geandrar@gmail.com) on 2018-04-18T18:59:28Z No. of bitstreams: 1 Leonardodemellobrandaoabdodib.pdf: 1435361 bytes, checksum: 5e9afeb4cc3aff2697cb2afe973ab9ca (MD5) / Rejected by Adriana Oliveira (adriana.oliveira@ufjf.edu.br), reason: on 2018-04-19T13:20:42Z (GMT) / Submitted by Geandra Rodrigues (geandrar@gmail.com) on 2018-04-19T13:31:11Z No. of bitstreams: 1 leonardodemellobrandaoabdodib.pdf: 1435361 bytes, checksum: 5e9afeb4cc3aff2697cb2afe973ab9ca (MD5) / Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2018-04-19T13:32:56Z (GMT) No. of bitstreams: 1 leonardodemellobrandaoabdodib.pdf: 1435361 bytes, checksum: 5e9afeb4cc3aff2697cb2afe973ab9ca (MD5) / Made available in DSpace on 2018-04-19T13:32:56Z (GMT). No. of bitstreams: 1 leonardodemellobrandaoabdodib.pdf: 1435361 bytes, checksum: 5e9afeb4cc3aff2697cb2afe973ab9ca (MD5) Previous issue date: 2018-02-28 / Este trabalho descreve características importantes de um sistema híbrido power line communication (PLC)/comunicação sem fio para aplicações smart grid (SG) e Internet das coisas (IoT). Além disso, discute as vantagens dos sistemas híbridos em comparação com os sistemas não híbridos. Estas vantagens são demonstradas não somente do ponto de vista técnico, mas também pela perspectiva de infraestrutura. Além disso, esta dissertação destaca uma conexão entre a capilaridade do IoT e a infraestrutura de comunicação fornecida pelo SG, bem como os aspectos de segurança que relacionam o contexto SG e IoT. Além disso, este trabalho aborda a influência do meio ambiente nas comunicações de rede elétrica e sem fio. Por outro lado, existe um enorme esforço de pesquisa em relação às tecnologias avançadas de comunicação de dados, considerando tanto as aplicações IoT de baixa taxa de bits quanto as aplicações SG, de modo a cumprir os requisitos de projeto para sistemas de telecomunicações. Com o objetivo de maximizar o uso da largura de banda disponível para aplicações PLC, esta dissertação faz uso do esquema orthogonal chirp division multiplexing (OCDM) que usa a transformada discreta de Fresnel de forma análoga à transformada discreta de Fourier. Trabalhos anteriores mostraram resultados de desempenho interessantes para esse esquema em aplicações de banda passante (por exemplo, comunicação sem fio, fibra óptica e mídia acústica subaquática). Este trabalho aborda a construção de versões do esquema OCDM que permitem a comunicação de dados usando sinais banda base, possibilitando a aplicação do esquema OCDM em sistemas PLC. Além disso, ele introduz um esquema baseado em vários usuários denominado multichirp code division multiple access (MCp-CDMA), que é uma combinação de CDMA e OCDM com o objetivo de acomodar um grande número de nós e endpoints para PLC de banda estreita e que também seja adequado para aplicações SG e IoT. Finalmente, os resultados numéricos apontam que, para um ambiente difícil e ruidoso, o esquema OCDM é capaz de suavizar o efeito do ruído impulsivo. Além disso, o esquema OCDM demonstrou resultados excepcionais quando o comprimento do canal é desconhecido comparativamente aos esquemas Hermitian symmetric orthogonal frequency division multiplexing e monoportadora com prefixo cíclico. As simulações usando o esquema MCp-CDMA demonstraram grande estabilidade e consistência de desempenho entre os diferentes cenários analisados. / This work outlines important characteristics of hybrid power line communication (PLC)/wireless data communication system for smart grid (SG) and Internet of Things (IoT) applications. Moreover, it discusses the hybrid systems advantages in comparison to non-hybrid ones. These advantages are demonstrated not only in the technical point of view but also in the infrastructural perspective. Also, this thesis highlights a connec-tion between the capillarity of IoT and the communication infrastructure provided by SG as well as the security aspects that relate SG and IoT context. Furthermore, this work addresses the environmental influence on wireless and power line communications. In another hand, there is a huge research effort regarding advanced data communication technologies considering both low bit rate IoT and SG applications in order to comply with the requirements to design telecommunications systems. Aiming to maximize the use of the available bandwidth for PLC applications, this thesis makes use of the orthog-onal chirp division multiplexing (OCDM) scheme that uses discrete Fresnel transform in an analogous fashion as discrete Fourier transform. Previous works showed interesting performance results for such scheme in passband applications (e.g., wireless, optical fiber, and underwater acoustic media). This work addresses the design of versions of the OCDM scheme that can allow the data communication using baseband signals, making possible the application of the OCDM scheme in PLC systems. Furthermore, it introduces a mul-tiuser based scheme termed multichirp code division multiple access (MCp-CDMA), which is a combination of CDMA and OCDM, in order to accommodate a large number of nodes and end-points aiming narrowband PLC that is also suitable for SG and IoT applications. Finally, numerical results point out that for a hard and noisy environment, OCDM scheme is able to soften the impulsive noise effect. Also, OCDM scheme demonstrated outstand-ing results when the channel length is unknown comparatively to Hermitian symmetric orthogonal frequency division multiplexing and single carrier-cyclic prefix schemes. The simulations using the MCp-CDMA scheme demonstrated great stability and performance consistency among the different scenarios analyzed.

Submitted by Geandra Rodrigues (geandrar@gmail.com) on 2018-04-18T18:31:55Z No. of bitstreams: 1 mateusdelimafilomeno.pdf: 952346 bytes, checksum: 0eb883e1ceabb6c297f58be445761d84 (MD5) / Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2018-04-19T13:28:21Z (GMT) No. of bitstreams: 1 mateusdelimafilomeno.pdf: 952346 bytes, checksum: 0eb883e1ceabb6c297f58be445761d84 (MD5) / Made available in DSpace on 2018-04-19T13:28:21Z (GMT). No. of bitstreams: 1 mateusdelimafilomeno.pdf: 952346 bytes, checksum: 0eb883e1ceabb6c297f58be445761d84 (MD5) Previous issue date: 2018 / Esta dissertação tem como objetivo discutir as comunicações cooperativas híbrida e não híbrida aplicadas a sistemas de comunicação de dados em banda larga e em ambientes residenciais. Nesse sentido, o modelo de canal com retransmissor único em dois estágios é investigado para sistemas de comunicação em banda larga através da rede de energia elétrica. Este modelo de canal cooperativo é formado pela concatenação de dois canais com retransmissor único, cobrindo enlaces de comunicação de dados com até dois saltos. Além disso, um modelo de canal híbrido com retransmissor único, utilizando rede elétrica e ar, é analisado para sistemas de comunicação de dados em banda larga em que enlaces de até um salto são considerados. Expressões de taxas de dados alcançáveis ergódicas são derivadas para os modelos de canais cooperativos híbridos e não híbridos, a fim de compará-los. Devido às características de canais e ruído das redes de energia elétrica, os resultados numéricos são baseados em um conjunto de dados constituído por estimativas de canais e medições de ruído cobrindo a faixa de frequência de 1, 7 a 100 MHz e diferentes posições do nó retransmissor. Para os canais sem fio, o modelo HIPERLAN/2 com a mesma largura de banda é utilizado, considerando uma freqüência central de 5 GHz, enquanto o ruído aditivo é considerado branco gaussiano. Com relação aos sistemas de comunicação através da rede energia elétrica, mostra-se que o modelo de canal com retransmissor único em dois estágios é a melhor opção quando o enlace da fonte ao destino encontra-se severamente degradado (por exemplo, alta atenuação de sinal devido à longa distância entre nós fonte e destino e/ou presença de ruído de alta potência). Quando a degradação do canal não é acentuada, o modelo de canal de dois saltos é mais apropriado. Acerca dos sistemas híbridos, constata-se que, quando o retransmissor está no meio do caminho entre fonte e destino, o modelo de canal híbrido com retransmissor único apresenta o melhor desempenho em termos de taxa de dados alcançável ergódica, enquanto o modelo de canal híbrido de um salto oferece os melhores resultados para outros casos. / This dissertation aims to discuss hybrid and non-hybrid cooperative communications applied to in-home broadband data communication systems. In this sense, the two-stage single-relay channel model is investigated for in-home broadband power line communication systems. This cooperative channel model consists of the concatenation of two single-relay channels, covering data communication links with up to two hops. Moreover, a hybrid power line/wireless single-relay channel model is analyzed for broadband data communication systems, considering one-hop links. Ergodic achievable data rate expressions are derived for both hybrid and non-hybrid cooperative channel models in order to compare them. Due to channel and noise characteristics of electric power grids, numerical results are based on a data set constituted by power line channel estimates and additive noise measurements covering the frequency band from 1.7 up to 100 MHz and different relay positions. For wireless channels, the HIPERLAN/2 model with the same bandwidth is used, but at a central frequency of 5 GHz, while the additive noise is considered to be Gaussian white. Regarding only power line communication systems, it is shown that the two-stage single-relay channel model is the best option when the source-to-destination link is severely degraded (e.g., high signal attenuation due to the long distance between source and destination nodes and/or high-power noise presence). When the channel degradation is not severe, the two-hop channel model is more appropriate. Concerning hybrid systems, it is observed that, when the relay is halfway between source and destination nodes, the hybrid single-relay channel model presents the best performance in terms of ergodic achievable data rate, while the hybrid one-hop channel model yields the best results for other cases.

Made available in DSpace on 2016-04-04T18:31:25Z (GMT). No. of bitstreams: 1 Diego Cesar Valente e Silva.pdf: 2949032 bytes, checksum: 9f8f72c0ab49b16ab87dbd229e5acc93 (MD5) Previous issue date: 2009-02-09 / This work presents an experimental investigation on the implementation of wireless sensor networks (IEEE 802.15.4) over fiber optics. Such investigation was performed with the utilization of IEEE 802.15.4 transceivers, an optical fiber infrastructure inside a field-trial network, called KyaTera Network, and directly modulated lasers and photodiodes designed for usual lab applications. The analysis comprised optical and electrical signal-to-noise ratio meausermentes and packet error rate evaluation under different conditions of transmission (e.g., payload length and time between consecutive frames). Results indicate that the RF signals of the sensor network may be properly propagated through unamplified optical links of up to 100 km or for longer distances with the use of optical amplifiers. / Esse trabalho apresenta uma investiga??o experimental da implementa??o de redes de sensores (IEEE 802.15.4) sobre fibras ?pticas. Tal investiga??o foi realizada com a utiliza??o de transceptores IEEE 802.15.4, de uma infra-estrutura de fibras ?pticas localizada dentro uma rede experimental, chamada Rede KyaTera, e de lasers com modula??o direta e foto-diodos projetados para opera??es usuais em laborat?rios. A an?lise compreendeu medidas a raz?o sinal-ru?do ?ptica e el?trica e a avalia??o da taxa de erro de quadros sob diferentes condi??es de transmiss?o (p. ex., tamanho de payload e intervalo de tempo entre quadros sucessivos). Os resultados indicam que os sinais de RF da rede de sensores podem ser propagados adequadamente, sem amplifica??o ?pticapor, em enlaces de at? 100 km ou por dist?ncias ainda maiores, com a utiliza??o de amplificadores ?pticos.