From sokonkwo@delphi.com Sun Jul 10 01:59:45 1994
Path: ashpoly!cascade!transat!sunet!nordrelay!delphi!sokonkwo
From: sokonkwo@delphi.com (Seo-yeon Okonkwo)
Newsgroups: comp.dsp
Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1994Jul10.015945.6063@delphi.com>
Date: Sun, 10 Jul 1994 01:59:45 GMT
Organization: Delphi Internet Services
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Differential Binary Phase Shift Keying (DBPSK) parameter extraction results.

Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'.
Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization.

Has anyone encountered bit errors in their decoded text? The Golay decoder corrects up to 3 bit errors per 24-bit codeword.

-- 
Seo-yeon Okonkwo -- Delphi Internet Services
"Row 14. No joke."

From greyes@cern.ch Mon Jul 11 09:27:45 1994
Path: ashpoly!cascade!brgate!saturno!cern!greyes
From: greyes@cern.ch (Göran Reyes)
Newsgroups: comp.dsp
Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1994Jul11.092745.8024@cern.ch>
Date: Mon, 11 Jul 1994 09:27:45 GMT
References: <1994Jul10.015945.6063@delphi.com>
Organization: European Laboratory for Particle Physics, Geneva
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In article <1994Jul10.015945.6063@delphi.com>, sokonkwo@delphi.com (Seo-yeon Okonkwo) writes:
> Differential Binary Phase Shift Keying (DBPSK) parameter extraction results.
> Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'.

The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration!

-- 
=== Göran Reyes ===
Dept of Electrical Engineering, European Laboratory for Particle Physics, Geneva
"In theory there is no difference between theory and practice."