About DoKS      NL  |  EN Search:
  Starts with (bv. psycholog*)    Exact wordgroup (bv. "Visual Basic")
 
Home
Administration
Authors
Departments
Help
Years
 


1.063 theses on-line.
Most popular theses:
1
2
3
4
5
6
7
8
9
10
   
 More... 



Open Archives Initiative
Home
XIOS
Title : Study of small bandwidth digital modulation
Author :
VILLANUEVA, Marina
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.
Publisher : Xios
Publication date : 2006
Full text :
File Size Type Checksum
Eindwerk.pdf 2 MB Adobe PDF MD5
Appendices :
File Size Type Checksum
Type : Electronic Thesis or Dissertation
Language :
  • English
Rights : All rights reserved
Degree name : Elektronica
Degree level : Master
Discipline : ICT
Grantor of degree : Xios
Department : IWT
Awards :
Status : PUBLISHED
Promotor : Boutsen Jan
External Promotor : Rainer Petersen, PhD IMEC
Notes :
Embargo : false
Created : 14/11/2006 15:54
Last modified : 14/11/2006 15:54
Appears in :
2006
Views : 3340
Downloads : 29




©2004-2005 - XIOS Hogeschool Limburg - webmaster - Contact