Jose Amador wrote: > Taking adventage of SCS experience, they chose PSK > (cannot tell by heart if differential or not, a peek > to the manual is needed) as a modem, and depending on > the retry rate (closely related to BER) it tries more > complex constellations and more carriers. One of the > "secrets" is the switchover criteria...when retries > rise, then jump to the next "lower speed", whatever it > means.
I think that FEC could be used wisely... For instance: Initially, use ARQ, with the modulation "A", working at "A" bauds. When retries rise, enable FEC dinamically. If it fails again, jump to the lower speed, or even to another stronger modulation (versus noise, I mean). When the retries diminish, it may try with more carriers, or more complex constellations, or more speed. The key is to do it automatically, or adaptatively. The switchover criteria is the most complex problem... but it could be reached even with the trial and error mode. 73 de Nestor, CM3NA __________________________________________ XIII Convención Científica de Ingeniería y Arquitectura 28/noviembre al 1/diciembre de 2006 Cujae, Ciudad de la Habana, Cuba http://www.cujae.edu.cu/eventos/convencion Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/digitalradio/join (Yahoo! ID required) <*> To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
