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dc.title : Study of small bandwidth digital modulation
dc.creator : VILLANUEVA, Marina
dc.subject :
dc.description.abstract : Most attention these days of digital communication encompasses wideband techniques. However new small band techniques are generating new and unique applications. Only a few watts of RF energy are needed to accomplish worldwide communications. Many of the small band modes allow to use signals buried in noise. Using these techniques, for example EME (Earth-Moon-Earth) communications can be performed much easier. Hardware and RF power are minimised. Digital modem techniques using DSP are maximally used. PSK31 allows real time chat modes but even pictures can be sent. Long distance communication and controlled systems with mobile equipment are now much easier and opens new possibilities for example in long distance, network independent and security applications. The aim of this work is to study these small band modes and look into the boundaries of feasible applications. A controlled digital link has been set up using mainly PSK31. Under these controlled conditions, phenomena such as noise, interference, Doppler effects, SNR, IMD and BER are studied and measured. The transceivers also can be used on antenna and work on 14MHz, a frequency where many users can be found. This facilitates real life experiments. One of the big problems when faced with slow modes is the lack of dedicated instrumentation. Much practical information on small band modes is available from radio amateurs, but there is little technical documentation. PSK31 is quickly becoming one of the favourite communication modes.
dc.publisher : Xios
dc.contributor :
dc.date : 2006
dc.type : Electronic Thesis or Dissertation
dc.format : application/pdf
dc.identifier : http://doksxios.pxl.be/doks/do/record/Get?dispatch=view&recordId=Sxhl8ae57e8c0ec7ed15010ee6f637500037
dc.language : eng
dc.rights : All rights reserved
etd.degree.name : Elektronica
etd.degree.level : Master
etd.degree.discipline : ICT
etd.degree.grantor : Xios
 
 

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