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[hfsig] What can you do with an OFDM signal in a 3.5 KHz band pass?

tattje tattje at planet.nl
Sat Aug 20 20:14:22 UTC 2005


RE: [hfsig] What can you do with an OFDM signal in a 3.5 KHz bandpass?The
POTS will give you 56 kbit/sec in the same bandwidth.
Using OFDM some channels will not be available, fec is not enough, so one
has to spread the info over all the channels.
Reread the fs-1052, why do you think are so many different throughput speeds
defined?
10 kbits in 3 kHz? Forget it, may be sometimes, but not always.
HF is a naughty channel,
Regards
Henk
  -----Oorspronkelijk bericht-----
  Van: hfsig-bounces at lists.tapr.org
[mailto:hfsig-bounces at lists.tapr.org]Namens DuBose Walt Civ AETC CONS/LGCA
  Verzonden: vrijdag 19 augustus 2005 22:25
  Aan: 'TAPR HF Modes SIG Mailing List'
  Onderwerp: RE: [hfsig] What can you do with an OFDM signal in a 3.5 KHz
band pass?


  When talking to EOC, disaster relief and military contingency personnel
about HF data modes, they no longer ask how many words per minute is it, now
they are asking how many pages per minute is your capability.

  We can no longer think in WPM capability; but rather, pages per minute
(ppm).

  73,

  Walt/K5YFW

  -----Original Message-----
  From: hfsig-bounces at lists.tapr.org [mailto:hfsig-bounces at lists.tapr.org]On
Behalf Of DuBose Walt Civ AETC CONS/LGCA
  Sent: Friday, August 19, 2005 2:41 PM
  To: 'hfsig at lists.tapr.org'
  Subject: [hfsig] What can you do with an OFDM signal in a 3.5 KHz
bandpass?



  What can you do (what RAW throughput) can you get in a 3.5 Khz bandwidth
using an OFDM mode?
  Here's what I found using some figures based on the FS-1052, Appendix A
modem.
  Your User Throughput will be determined on how much RAW througput you use
for FEC.
  Walt/K5YFW


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