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[Discuss-gnuradio] Differential QPSK modulation details

From: irene159
Subject: [Discuss-gnuradio] Differential QPSK modulation details
Date: Fri, 16 May 2008 07:59:18 -0700 (PDT)


I am using blks2impl dqpsk modulator/demodulator. 

Focusing on the qpsk demodulator: 

Since "samples_per_symbol" value must be an integer >=2 and USRP samples at
64 Msamples/s with a 2^(n) possible decimation, if I have a 2100 kbps
carrier (=1050 ksym/s) :
- How can I possibly obtain a correct "samples_per_symbol" value? 
- Do I need a resampler and if so, how should I use it?

By the way, I might be wrong but I haven't seen were the Costas loop and
time recovery are implemented in this file...

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