[Date Prev][Date Next][Thread Prev][Thread Next] - [Date Index][Thread Index][Author Index]

Data representation in G3RUH modem

Hi folks,

If I'm not mistaken, the PAM waveform in the discrete implementation 
of the G3RUH modem is NRZ-L (level) coded.  In the DSP56002EVM 
version, from Doug Braun's site, NRZ-S (inversion, space) coding is 
used.  However, I've used both versions for demodulating Pacsat 
downlinks.  Am I missing something?

While I'm at it: any suggestions for (or pointers to) clock recovery 
algorithms for multi-level PAM?  Should another scrambler polynomial 
be considered for obtaining zero crossings in multi-level PAM?  Does 
NRZ-I (inversion) coding have advantages over NRZ-L?


   JG Lochner  ESL, Universiteit van Stellenbosch
   e-pos:      lochner@ing.sun.ac.za
   webtuiste:  http://esl.ee.sun.ac.za/~lochner

Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org