[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Discuss-gnuradio] 8b/10b for GMSK
From: |
Johnathan Corgan |
Subject: |
Re: [Discuss-gnuradio] 8b/10b for GMSK |
Date: |
Mon, 05 Feb 2007 10:15:36 -0800 |
User-agent: |
Thunderbird 1.5.0.9 (X11/20070103) |
Brett L. Trotter wrote:
> Yay- congratulations- transferred 100MB successfully and all of my
> 'stumbler' packets- even with UDP.
You're using FSP (which goes over UDP), correct? FSP has a retry
mechanism, so good. Glad it's working now!
> I'm going to continue work on the 8b/10b, because I still think
> that's the closest 'real' solution to the issue- and the overhead
> isn't as severe as repeating 1500 byte packets-
Well, only the "stumbler" packets get repeated, and as you found, there
were only five in 10,000 that you tried. So your overhead isn't 100%,
it's no different than if your channel dropped one in 2000 packets. (For
those following, the problem before resulted in a complete link failure,
as the retransmitted packets on the connection would always fail CRC.)
> Worst case, it can be an option in the python that most people can
> leave turned off.
An 8b/10b line coding scheme would probably be best implemented as a
standalone hierarchical block that a developer could choose to use or
not as part of a flow graph implementing a transmit and receive path.
> FYI: Am achieving nearly 100kb/s with -r 800k on a BasicTX
Is that bytes or bits per second?
--
Johnathan Corgan
Corgan Enterprises LLC
http://corganenterprises.com