From aramirez@unam.mx Sun Aug 14 23:23:45 1994
Path: ashpoly!bigsur!pacrim!krgate!eunha!unam!aramirez
From: aramirez@unam.mx (Amy Ramírez)
Newsgroups: comp.dsp
Subject: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1994Aug14.232345.8348@unam.mx>
Date: Sun, 14 Aug 1994 23:23:45 GMT
Organization: Universidad Nacional Autónoma de México (DGSCA)
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Differential Binary Phase Shift Keying (DBPSK) parameter extraction results.

Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization.
The payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code.

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

-- 
Amy Ramírez -- Universidad Nacional Autónoma de México (DGSCA)
"When every node is whole, the channel opens."

From mmacdonald@cam.ac.uk Tue Aug 16 07:03:45 1994
Path: ashpoly!cascade!transat!eunet-de!hansebox!cam!mmacdonald
From: mmacdonald@cam.ac.uk (Mike MacDonald)
Newsgroups: comp.dsp
Subject: Re: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1994Aug16.070345.7982@cam.ac.uk>
Date: Tue, 16 Aug 1994 07:03:45 GMT
References: <1994Aug14.232345.8348@unam.mx>
Organization: University of Cambridge Computer Laboratory
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In article <1994Aug14.232345.8348@unam.mx>, aramirez@unam.mx (Amy Ramírez) writes:
> Differential Binary Phase Shift Keying (DBPSK) parameter extraction results.

A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single!

-- 
Mike MacDonald
Tape trading list upon request. SASE required for international mail.