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PA2AGA > TCPDIG 27.09.96 02:20l 106 Lines 3425 Bytes #-10873 (0) @ EU
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Date: Wed, 25 Sep 96 09:31:59 MET
Message-Id: <tcp_96_200>
From: pa2aga
To: tcp_broadcast@pa2aga-10
Subject: TCP-Group Digest 96/200
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TCP-Group Digest Tue, 24 Sep 96 Volume 96 : Issue 200
Today's Topics:
higher speeds, coding etc.. (2 msgs)
unsubscribe (2 msgs)
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Date: Sun, 22 Sep 1996 17:11:13 -0700 (PDT)
From: Phil Karn <karn@laptop.ka9q.ampr.org>
Subject: higher speeds, coding etc..
>You really should check at http://www.hamradio.si/hamradio/packet.html
Matjaz Vidmar also has two papers in the current ARRL/TAPR digital conference
proceedings on his high speed PSK radios.
Matjaz makes a very good point in his papers that needs to be better
appreciated in the ham community: the choice of PSK for the Microsat
downlinks was a poor choice at such a low data rate because the
carrier recovery loop bandwidths that are required are much smaller
than the doppler shifts and other frequency uncertainties. But at high
data rates (like 1.2288 megabits/sec), this becomes a non-issue. The
PSK stuff just works.
Phil
------------------------------
Date: Mon, 23 Sep 1996 17:01:34 -0700 (PDT)
From: Phil Karn <karn@qualcomm.com>
Subject: higher speeds, coding etc..
>We allready have 13/23 cm PSK RTX for high speed packeting...
I saw the articles by Matjaz in the 15th DCC proceedings. Nice job!
Two questions: do you have any quantitative BER vs Eb/N0 performance
figures for the PSK demodulator, and have you considered DBPSK
demodulation? Uncoded DBPSK is nearly as good as uncoded BPSK, but
it's a lot simpler to implement the demodulator. Since NRZI already
differentially encodes, you could PSK demodulate this with a 1-symbol
delay line and a multiplier instead of a Costas loop.
Phil
------------------------------
Date: Mon, 23 Sep 1996 23:08:40 +0200
From: "Rafael Garcia" <rgb-eca@redestb.es>
Subject: unsubscribe
unsubscribe
------------------------------
Date: Mon, 23 Sep 1996 22:43:08 +0200
From: "Rafael Garcia" <rgb-eca@redestb.es>
Subject: unsubscribe
unsubscribe tcp-group rgb-eca@redestb.es
------------------------------
End of TCP-Group Digest V96 #200
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