Made available in DSpace on 2015-10-19T11:49:43Z (GMT). No. of bitstreams: 1 pimentelsobrinho2013.pdf: 2616020 bytes, checksum: abbcfacc53dbab0dc8ddca2f8ac2b67b (MD5) Previous issue date: 2013-03-27 / Study about contributions of the concept of quantum bit (q-bit) and analyze the possibilities in quantum computers processing and increase the data storage capacity for devices memory. From the analysis of the q-bit is possible to notice changing in mental and social structures beyond their direct interference in the process of memory as a way of preserving information in different formats. Observations in the contributions from Quantum Mechanics, by measuring process, for Information Science and theoretical-epistemic confluence between the two sciences complemented by some opinions around the issues that still needing answer. Insertion of terms entanglement and superposition that were identified as fundamental to understanding the concept of q-bit is the basis to accept the updates in the concepts, formulations and descriptions established in Information Science / Estudo das contribuições do conceito do bit quântico (q-bit) e suas possibilidades de processamento nos computadores quânticos e de aumento da capacidade de armazenamento dos dados em dispositivos de memória. A partir da análise do q-bit, é possível a percepção das alterações de estruturas mentais e sociais, além de sua interferência direta no processo de memória como meio de preservação de informações sob diversos formatos. Observações das contribuições a Mecânica Quântica para a Ciência da Informação e a confluência teórico epistêmica entre as duas ciências, complementadas por algumas ponderações em torno das questões que ainda necessitam de respostas. Inserção dos termos emaranhamento e superposição de estados identificados como fundamentais para o entendimento do conceito de q-bit. Tais termos são a base para dimensionar as alterações em conceitos, formulações e descrições consagrados na Ciência da Informação. Palavras-chave: Bit quântico

[pt] Este trabalho descreve um processador de sinais em tempo real e o algoritmo de Bruun para o processamento da transformada rápida de Fourier. O hardware utiliza bancos de memória comutáveis entre si e processador do tipo bit-slide para atender ao requisito de tempo real. Embora projetado especificamente para executar o algoritmo de Bruun, permite qualquer tipo de processamento de sinais, sendo necessário apenas o desenvolvimento de software. / [en] This work describes a real time signal processor and Bruun s algorithm for the Fast Fourier Transform. Hardware employs switching banks of memories and a bit-slice processor to achieve real time processing. The sistem was designed specifically for the Bruun s algorithm, but it allows any type of signal processing, only software development being required.

This work describes the problems of data transmission via wireless networks. We discuss the theoretical background of computer networks, the base transmission protocols and their use. We also describe standards and mechanisms for wireless transmission and described in detail the procedure of data transfer via WiFi network. In practical part we describe prototype and the basic functions of the prototype its components.

Real-time multimedia streaming is an extensively researched topic. The possibility of streaming video over the internet in real time requires smart solutions on many levels at the player and streamer side, as well as along the intermediate network. There are many different methods used to achieve this, but not all of them are suitable for the low latency real-time streaming needed for remote operations of vehicles. This thesis focuses on the bit-rate control at the streamer side to achieve low latency, meaning how the video quality is changed to adapt to the changes in the network. A literature study was conducted, in order to find what algorithms are currently being used for real-time streaming. It investigated both what control methods are used, as well as what feedback metrics are feed to these controllers. These approaches where then evaluated from a theoretical standpoint for real-time low latency streaming on 4G networks together with the rest of the assumed system. Using these discovered methods, two new algorithms were created. They were tested against an already existing benchmark controller, both in simulation and on a real network. As the benchmark algorithm proved to already be using all suitable feedback metrics, only small control alterations where done to the existing benchmark algorithm. The goal for the new algorithms was to increase the total throughput of the video stream, without decreasing the robustness and causing a higher latency.  Simulation and real network tests proved that the new algorithms are unable to provide a higher throughput without increasing the latency. The conclusion is that the benchmark controller is well designed and explicitly configured to work for the goal of low latency video streaming. This being the case with many controllers in the industry, as they are well designed and extensively trimmed for their specific task.

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International Telemetering Conference Proceedings / October 20-23, 2003 / Riviera Hotel and Convention Center, Las Vegas, Nevada / In many spacecraft receiver applications, the Fast Fourier Transform (FFT) provides a powerful tool for measuring the amplitude and frequency of an unmodulated RF signal. By increasing the FFT acquisition time, tiny signals can be coaxed from the noise and their frequency measured by determining which frequency bin the signal energy appears. The greater the acquisition time, the narrower the bin bandwidth and the more accurate the frequency measurement. In modern satellite operations it is often desirable for the receiver to measure the frequency of a carrier which is modulated with BPSK data. The presence of the BPSK data limits the FFT acquisition time since the signal may switch polarities a number of times while the FFT samples are being acquired. This polarity switching spreads the signal energy into multiple frequency bins making frequency measurement difficult or impossible. The Bit Templating Technique, used for the first time in the CMC Electronics Cincinnati TDRSS / BPSK Spacecraft Receiver, collects the modulated waveform energy back into a signal bin so that accurate amplitude and frequency information can be calculated.

ITC/USA 2007 Conference Proceedings / The Forty-Third Annual International Telemetering Conference and Technical Exhibition / October 22-25, 2007 / Riviera Hotel & Convention Center, Las Vegas, Nevada / Modern telemetry systems require flexible bit rate telemetry encoders in order to optimize mission formats for varying data rate requirements and/or signal to noise conditions given a fixed transmitter power. Implementing a variable bit rate telemetry encoder requires consideration of several possible architectural topologies that place different system requirements on data acquisition modules within the encoder in order to maintain adequate signal fidelity of sensor information. This paper focuses on the requirements, design considerations and tradeoffs associated with differing architectural topologies for implementing a variable bit rate encoder and the resulting implications on the encoder systems data acquisition units.

International Telemetering Conference Proceedings / October 25-28, 1999 / Riviera Hotel and Convention Center, Las Vegas, Nevada / Systems & Processes Engineering Corporation (SPEC) compared compression and decompression algorithms and developed optimal forms of lossless and lossy compression for hyperspectral data. We examined the relationship between compression-induced distortion and additive noise, determined the effect of errors on the compressed data, and showed that the data could separate targets from clutter after more than 50:1 compression.

International Telemetering Conference Proceedings / October 25-28, 1999 / Riviera Hotel and Convention Center, Las Vegas, Nevada / Radio frequency power margins in well planned line-of-sight (LOS) air-to-ground digital data transmission systems usually produce signal to noise ratios (SNR) that can deliver error free service. Sometimes field performance falls short of design and customer expectations. Recent flight tests conducted by the tri-service Advanced Range Telemetry (ARTM) project confirm that the dominant source of bit errors and short term link failures are “clusters” of severe error burst activity produced by flat fading, dispersive fading and poor antenna patterns on airborne vehicles. This paper introduces the techniques used by ARTM to measure bit error performance of aeronautical telemetry links.

International Telemetering Conference Proceedings / October 25-28, 1993 / Riviera Hotel and Convention Center, Las Vegas, Nevada / This paper describes the recently developed Loral Instrumentation ground-based equipment used to select and process post-flight test data from the Boeing 777 airplane as it is played back from a digital tape recorder (e.g., the Ampex DCRSi II) at very high speeds. Gigabytes (GB) of data, stored on recorder cassettes in the Boeing 777 during flight testing, are played back on the ground at a 15-30 MB/sec rate into ten multiplexed Loral Instrumentation System 500 Model 550s for high-speed decoding, processing, time correlation, and subsequent storage or distribution. The ten Loral 550s are multiplexed for independent data path processing from ten separate tape sources simultaneously. This system features a parallel multiplexed configuration that allows Boeing to perform critical 777 flight test processing at unprecedented speeds. Boeing calls this system the Parallel Multiplexed Processing Data (PMPD) System. The key advantage of the ground station's design is that Boeing engineers can add their own application-specific control and setup software. The Loral 550 VMEbus allows Boeing to add VME modules when needed, ensuring system growth with the addition of other LI-developed products, Boeing-developed products or purchased VME modules. With hundreds of third-party VME modules available, system expansion is unlimited. The final system has the capability to input data at 15 MB/sec. The present aggregate throughput capability of all ten 24-bit Decoders is 150 MB/sec from ten separate tape sources. A 24-bit Decoder was designed to support the 30 MB/sec DCRSi III so that the system can eventually support a total aggregate throughput of 300 MB/sec. Clearly, such high data selection, rejection, and processing will significantly accelerate flight certification and production testing of today's state-of-the-art aircraft. This system was supplied with low level software interfaces such that the customer would develop their own applications specific code and displays. The Loral 550 lends itself to this kind of applications due to its VME chassis, VxWorks operating system and the modularity of the software.