Thesis (Ph. D.)--University of Wisconsin--Madison, 1969. / Typescript. Vita. Description based on print version record. Includes bibliographical references (leaves 789-809 (v. 3)).

Thesis (M.S.)--University of Wisconsin--Madison, 1969. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

No description available.

Thesis (M.S.)--Boise State University, 2010. / Includes abstract. Includes bibliographical references (leaves 73-75).

Thesis (M.S.)--Boise State University, 2010. / Title from t.p. of PDF file (viewed July 20, 2010). Includes abstract. Includes bibliographical references (leaves 73-75).

M.Ing. / The transmission of digital data at higher data rates and greater reliabilities is becoming increasingly more important in the society of today. The usage of, especially wireless digital data, is increasing at an alarming rate, and the need arises for more bandwidth to be made available for this purpose. Hence, the need arises to optimise and expand the usage of bandwidth currently under use. Existing wireless channels, such as the commercial FM service, need to be re-evaluated and unused bandwidth needs to be developed and used as close to capacity as possible. In this dissertation, a study was launched to develop the FM SST (Supplementary Signal Transmission) commercial analog service as a simplex digital channel that can commercially be used to transmit a myriad of digital data. With the help of a commercial FM radio channel, digital data was transmitted using a number of different modulation schemes to obtain channel measurements for the FM SST channel. The modulation scheme that performed the best, given certain criteria, was GMSK. This raw information was then used to extract first and higher order statistical information from the channel, in order to parameterise discrete channel models, based on a Markov process. The channel models that were used were the Gilbert, GilbertElliott and Fritchman channel models. These channel models were then tested according to their iirst and higher order statistical data to evaluate their effectiveness in modelling the error process on the FM SST channel. It was found that the channel model best approximating the real channels was the Gilbert channel. Once satisfactory results were obtained, these discrete channel models were then used to evaluate various error correction schemes for their ability to correct burst errors on the FM SST channel. From the various schemes evaluated, a (63,39) BCH with an interleaver of index 4 was found to perform the best. The purpose of which is to transmit digital data at the highest data rate possible and at the same time having a bit error rate less than lxl0-6.

No description available.

No description available.

Thesis (MScEng)--University of Stellenbosch, 2002. / ENGLISH ABSTRACT: The high performance of present digital phase-locked loops makes it the preferred choice for the generation of stable, low noise, tunable local oscillators in wireless communications applications. Most transmitters use superheterodyn techniques for up-conversion of the modulated signal to the required transmission frequency. Another technique is to inject the modulation signal into a phase-locked loop and consequently generate a frequency modulated signal directly at the transmission frequency. The aim of this study is to obtain a synthesizer configuration for the effective generation of wideband FM, considering both passive and active loop filters. The selection is based on synthesizer output signal quality, settling time and loop response to the modulation signal. / AFRIKAANSE OPSOMMING: Die hoe werksverrigting van fase-sluit lusse maak dit die verkiesde keuse vir die generasie van stabiele, lae ruis, verstelbare ossillators vir draadlose kommunikasie toepassings. Meeste senders gebruik "superheterodyn" tegnieke vir die op-menging van die gemoduleerde sein na die verlangde uitsaai frekwensie. 'n Ander tegniek is om die modulasie sein in 'n fase-sluit Ius te voer en so doende 'n gemoduleerde sein direk by die transmissie frekwensie te genereer. Die doel van hierdie studie is om 'n sintetiseerder konfigurasie te verkry vir die effektiewe opwekking van 'n wyeband FM sein, deur beide passiewe en aktiewe Ius filters in konsiderasie te neem. Die seleksie geskiet gebaseer op sintetiseerder uittree sein kwaliteit, sluit tyd en Ius gedrag as gevolg van die modulasie sein.

Orientador: Adriana Maria Bernardes da Silva / Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Geociencias / Made available in DSpace on 2018-08-12T06:40:25Z (GMT). No. of bitstreams: 1 Alves_CristianoNunes_M.pdf: 4787468 bytes, checksum: 0a45b75d1274f8bc2035a479fc63a8a9 (MD5) Previous issue date: 2008 / Resumo: Esta pesquisa busca analisar as dinâmicas sócio-territoriais na cidade atual. Para tanto, pretendemos contribuir para o entendimento da conformação e da espessura dos circuitos de rádio FM e produção fonográfica em Campinas. O circuito FM em Campinas se insere no campo da indústria cultural desde a década de 1970, tendo se expandido no contexto de urbanização e metropolização crescentes no Brasil. Hoje este circuito integra um sistema maior, atrelado à estratégias verticais de uso do território. Observamos que em contrapartida ao circuito FM, certo componente musical residual nos lugares envolve, entre outros, a produção alternativa e as rádios livres. Envolvidos por uma divisão técnica e territorial do trabalho dinamizada por círculos ascendentes de informação, esses circuitos mais territorializados sobrevivem à cisão e fragmentação urbanas. Trata-se, pois, de um estudo de Campinas enquanto um lugar que abriga densidades técnica, informacional e comunicacional. Problematizamos as condições geográficas contemporâneas de vida nesta cidade, indagando sobre o componente comunicacional no uso do território. / Abstract: This research examines the dynamic socio-territorial in the city today. For this reason, we are looking forward to contribute to the understanding of the formation and the thickness of the circuits of radio FM and the music production in Campinas. The circuit FM in Campinas falls in the field of cultural industry since de decade of 1970, and has been expanding in the context of urbanization and metropolis growing in Brazil. Today this circuit incorporates a bigger system, coupled with the strategies of vertical use of the territory. We noticed that in contrast to the circuit FM, some residual musical component in places involves, among others, the alternative production and free radios. These circuits involved by a technically and territorial division of labor spurred by circuits upside of information, survive to the urban division and fragmentation. It is, therefore, a study of Campinas as a place that houses technical, informational and communicational densities. We analyzed geographical conditions of contemporary life in this city, inquiring about the communication component in the use of the territory. / Mestrado / Análise Ambiental e Dinâmica Territorial / Mestre em Geografia