Here is an interesting paper on parallel modem design using very high baud rates. One thing that does seem to stand out is the SNR that is required to make this kind of modem work on HF. This design uses a pilot tone reference and tubo codes and even with baud rates of ~ 2000 it attains bps rates of 9600 using 64QAM. This appears to have originated around 2002. I don't pretend to understand much of the math, but some of the historical information may be of interest too.
http://www.argreenhouse.com/society/TacCom/papers98/11_04i.pdf 73, Rick, KV9U 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/
