diff options
Diffstat (limited to 'gnuradio-core/src/python/gnuradio/blksimpl/dbpsk.py')
| -rw-r--r-- | gnuradio-core/src/python/gnuradio/blksimpl/dbpsk.py | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/gnuradio-core/src/python/gnuradio/blksimpl/dbpsk.py b/gnuradio-core/src/python/gnuradio/blksimpl/dbpsk.py index e0c0054a69..cf38f02e6c 100644 --- a/gnuradio-core/src/python/gnuradio/blksimpl/dbpsk.py +++ b/gnuradio-core/src/python/gnuradio/blksimpl/dbpsk.py @@ -39,7 +39,7 @@ _def_gray_code = True _def_verbose = False _def_log = False -_def_costas_alpha = 0.00 +_def_costas_alpha = None _def_gain_mu = 0.03 _def_mu = 0.05 _def_omega_relative_limit = 0.005 @@ -242,8 +242,8 @@ class dbpsk_demod(gr.hier_block): # Costas loop (carrier tracking) # The Costas loop is not needed for BPSK, though it can help. Turn the Costas loop on - # by setting an alpha value of something greater than 0 (e.g., 0.1) - if self._costas_alpha > 0.0: + # by setting an alpha value not None. + if self._costas_alpha is not None: costas_order = 2 beta = .25 * self._costas_alpha * self._costas_alpha self.costas_loop = gr.costas_loop_cc(self._costas_alpha, beta, 0.002, -0.002, costas_order) @@ -291,7 +291,7 @@ class dbpsk_demod(gr.hier_block): self._setup_logging() # Connect and Initialize base class - if self._costas_alpha > 0.0: # With Costas Loop + if self._costas_alpha is not None: # With Costas Loop self._fg.connect(self.pre_scaler, self.agc, self.costas_loop, self.rrc_filter, self.clock_recovery, self.diffdec, self.slicer, self.symbol_mapper, self.unpack) @@ -313,7 +313,10 @@ class dbpsk_demod(gr.hier_block): print "bits per symbol = %d" % self.bits_per_symbol() print "Gray code = %s" % self._gray_code print "RRC roll-off factor = %.2f" % self._excess_bw - print "Costas Loop alpha = %.5f" % self._costas_alpha + if self._costas_alpha is not None: + print "Costas Loop alpha = %.5f" % self._costas_alpha + else: + print "Costas Loop is turned off" print "M&M symbol sync gain = %.5f" % self._gain_mu print "M&M symbol sync mu = %.5f" % self._mu print "M&M omega relative limit = %.5f" % self._omega_relative_limit @@ -324,7 +327,7 @@ class dbpsk_demod(gr.hier_block): gr.file_sink(gr.sizeof_gr_complex, "prescaler.dat")) self._fg.connect(self.agc, gr.file_sink(gr.sizeof_gr_complex, "agc.dat")) - if self._costas_alpha > 0.0: + if self._costas_alpha is not None: self._fg.connect(self.costas_loop, gr.file_sink(gr.sizeof_gr_complex, "costas_loop.dat")) self._fg.connect((self.costas_loop,1), |