Yes, all/most of what you suggest and perhaps more innovative coding that might be discovered.
We must start thinking out side of the bun...errr box.
Hummm, I hadn't thought about token passing...but if you use ARQ, while one stations is decoding another one can send.
Most current research indicated that it will take 4 times as long to decode a signal as transmit it. So if your "transmit frame" is 1 second, then you decode time is 4 seconds.
Walt/K5YFW
-----Original Message-----
From: digitalradio@yahoogroups.com
[mailto:digitalradio@yahoogroups.com]On Behalf Of Tim Gorman
Sent: Wednesday, November 23, 2005 6:00 PM
To: digitalradio@yahoogroups.com
Subject: Re: [digitalradio] Re: 39 Tone DQPSK - ARQ Modem in PCALE with
FT P - (Soundcard)
On Wednesday 23 November 2005 15:14, DuBose Walt Civ AETC CONS/LGCA wrote:
> Dave makes several invalid assumptions...but mainly that the 16 KHz signal
> would not allow any other modes or like modes access to the same 16
> KHz...this is an error. I would submit that a properly designed mode using
> 16 KHz could support 3 or 4 other like modes...then the average usage would
> be 4 KHz per user. Or in the case of narrow bandwidth modes of like
> structure, they you might be able to fit 10 QSO in the same
> bandwidth...thus 11 users within 16 kHz or 1 user of every 1.5 KHz.
The frequencies would be shared how? CMSA/CD? Token passing? Are you
considering this only for keyboard-to-keyboard use, for computer-to-computer
use, or for a synchronized data stream such as digital voice? When you speak
of bandwidth per user, the natural assumption is inter-person communication.
That hardly requires the use of full 16khz bandwidth.
Perhaps the protocol could be designed to increase bandwidth as more users are
on-channel or as data intensity increases? (e.g. computer to computer file
transfer during a keyboard-to-keyboard conversation) Of course, if the mode
starts out narrow then a detection scheme would be needed to determine if
someone else has started up a conversation within the wider bandwidth. That's
not a trivial thing to determine.
Otherwise, even with 4 users you would be tying up more than 4khz per user.
4khz per user in a crowded band is going in the opposite direction from where
digital should be going. It should be *more* spectrum efficient, not less.
tim ab0wr
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