--- KV9U <[EMAIL PROTECTED]> wrote: > I still have not understood what P2 and P3 have that > is all that special and allows them to run as fast > as they do (not to mention they are also ARQ modes). > If we had non ARQ modes with similar modulation, why > would not that run at a similar rate of transmission > even if you did not adjust for adaptive speeds. > > 73, > > Rick, KV9U
Block coding, to recover errors without retransmission, interleaving, to convert block losses into single bit losses (and make error recovery possible), FEC, in the form of convolutional encoding with Viterbi (soft) with maximum likelyhood decoding. Compression, whenever applicable, reduces the data volume to be sent, and so, content to be mistaken... Of course, multicarrier modulation, to allow high data speeds with low signalling rates, to fight multipath... of course, it requires BANDWIDTH... It is not a "single trick", but a boxful of them... 73 de Jose, CO2JA __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com 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/ <*> 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/
