Andy, LF,
Which digital mode could be most suited for a band where one has just
an antenna bandwidth of some Hz? You know what i mean... And what could
be the "gain" compared to DFCW-600. Gain means here, how far(er) could
it be detected, not how much more information can i transmit within the
same time.
73, Stefan/DK7FC
PS: I see that e.g. JT65 needs abt 200 Hz, so this NOT suited!
Am 29.07.2010 23:07, schrieb Andy Talbot:
It would be very interesting to see those figures normalised to
a constant data rate / bandwidth. For example, PSK31 shown at -10dB is
identical to PKK63 at -7dB - well it would be, its the same modulation,
just faster. Ie plot Bits/second/Hz vs. Eb/No, then stick the Shannon
limit on the graph and see which lie nearest.
The fact that JT65 is at the top is probably because it sits at
around 0.27 chars / second, or something like 1.2 B/s. Although even
after normalisation, it would no doubt still score well up.
|
|
