diff options
| author | jcorgan <jcorgan@221aa14e-8319-0410-a670-987f0aec2ac5> | 2008-09-14 18:37:08 +0000 |
|---|---|---|
| committer | jcorgan <jcorgan@221aa14e-8319-0410-a670-987f0aec2ac5> | 2008-09-14 18:37:08 +0000 |
| commit | 5c071b07710d2c4e127d321faba59b2a7b1d7c8d (patch) | |
| tree | 448d753e9459e0edb0be4f9d1409f1b354c772fe /gnuradio-examples/python/digital-bert/receive_path.py | |
| parent | 53dad5b53ec6468b23947e933ab18c422895f4e1 (diff) | |
Adds frequency accessor for Costas loop, BERT receiver displays frequency and timing offset
git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@9576 221aa14e-8319-0410-a670-987f0aec2ac5
Diffstat (limited to 'gnuradio-examples/python/digital-bert/receive_path.py')
| -rw-r--r-- | gnuradio-examples/python/digital-bert/receive_path.py | 32 |
1 files changed, 17 insertions, 15 deletions
diff --git a/gnuradio-examples/python/digital-bert/receive_path.py b/gnuradio-examples/python/digital-bert/receive_path.py index 84ff329165..e273923a4f 100644 --- a/gnuradio-examples/python/digital-bert/receive_path.py +++ b/gnuradio-examples/python/digital-bert/receive_path.py @@ -41,21 +41,22 @@ class receive_path(gr.hier_block2): gr.io_signature(1, 1, gr.sizeof_gr_complex), # Input signature gr.io_signature(0, 0, 0)) # Output signature - sps = int(if_rate/symbol_rate) - print "IF sample rate:", n2s(if_rate) + self._if_rate = if_rate + self._sps = int(self._if_rate/symbol_rate) + print "IF sample rate:", n2s(self._if_rate) print "Symbol rate:", n2s(symbol_rate) - print "Samples/symbol:", sps + print "Samples/symbol:", self._sps print "RRC bandwidth:", excess_bw # Create AGC to scale input to unity self._agc = gr.agc_cc(1e-5, 1.0, 1.0, 1.0) # Create RRC with specified excess bandwidth - taps = gr.firdes.root_raised_cosine(1.0, # Gain - sps, # Sampling rate - 1.0, # Symbol rate - excess_bw, # Roll-off factor - 11*sps) # Number of taps + taps = gr.firdes.root_raised_cosine(1.0, # Gain + self._sps, # Sampling rate + 1.0, # Symbol rate + excess_bw, # Roll-off factor + 11*self._sps) # Number of taps self._rrc = gr.fir_filter_ccf(1, taps) @@ -73,7 +74,7 @@ class receive_path(gr.hier_block2): # Create a M&M bit synchronization retiming block mm_mu = 0.5 - mm_omega = sps + mm_omega = self._sps print "MM gain mu:", mm_gain_mu print "MM gain omega:", mm_gain_omega @@ -103,14 +104,15 @@ class receive_path(gr.hier_block2): self.connect(self, self._agc, self._rrc, self._costas, self._mm, self._c2r, self._slicer, self._descrambler, self._ber) + def frequency_offset(self): + return self._costas.freq()*self._if_rate/(2*math.pi) + + def timing_offset(self): + return self._mm.omega()/self._sps-1.0 + def snr(self): return self._snr_probe.snr() - def signal_mean(self): - return self._snr_probe.signal_mean() - - def noise_variance(self): - return self._snr_probe.noise_variance() - def ber(self): return (1.0-self._ber.density())/3.0 + |