_def_verbose = False
_def_log = False
-_def_costas_alpha = None
-_def_gain_mu = 0.03
-_def_mu = 0.05
+_def_costas_alpha = 0.1
+_def_gain_mu = None
+_def_mu = 0.5
_def_omega_relative_limit = 0.005
ntaps = 11 * self._samples_per_symbol
arity = pow(2,self.bits_per_symbol())
-
+
# turn bytes into k-bit vectors
self.bytes2chunks = \
gr.packed_to_unpacked_bb(self.bits_per_symbol(), gr.GR_MSB_FIRST)
self.symbol_mapper = gr.map_bb(psk.binary_to_ungray[arity])
self.diffenc = gr.diff_encoder_bb(arity)
-
+
self.chunks2symbols = gr.chunks_to_symbols_bc(psk.constellation[arity])
# pulse shaping filter
self.rrc_taps = gr.firdes.root_raised_cosine(
- self._samples_per_symbol, # gain (samples_per_symbol since we're
- # interpolating by samples_per_symbol)
- self._samples_per_symbol, # sampling rate
- 1.0, # symbol rate
- self._excess_bw, # excess bandwidth (roll-off factor)
+ self._samples_per_symbol, # gain (samples_per_symbol since we're
+ # interpolating by samples_per_symbol)
+ self._samples_per_symbol, # sampling rate
+ 1.0, # symbol rate
+ self._excess_bw, # excess bandwidth (roll-off factor)
ntaps)
-
self.rrc_filter = gr.interp_fir_filter_ccf(self._samples_per_symbol,
self.rrc_taps)
def _print_verbage(self):
- 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 "\nModulator:"
+ 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
def _setup_logging(self):
print "Modulation logging turned on."
self._fg.connect(self.bytes2chunks,
- gr.file_sink(gr.sizeof_char, "bytes2chunks.dat"))
+ gr.file_sink(gr.sizeof_char, "tx_bytes2chunks.dat"))
self._fg.connect(self.symbol_mapper,
- gr.file_sink(gr.sizeof_char, "graycoder.dat"))
+ gr.file_sink(gr.sizeof_char, "tx_graycoder.dat"))
self._fg.connect(self.diffenc,
- gr.file_sink(gr.sizeof_char, "diffenc.dat"))
+ gr.file_sink(gr.sizeof_char, "tx_diffenc.dat"))
self._fg.connect(self.chunks2symbols,
- gr.file_sink(gr.sizeof_gr_complex, "chunks2symbols.dat"))
+ gr.file_sink(gr.sizeof_gr_complex, "tx_chunks2symbols.dat"))
self._fg.connect(self.rrc_filter,
- gr.file_sink(gr.sizeof_gr_complex, "rrc_filter.dat"))
+ gr.file_sink(gr.sizeof_gr_complex, "tx_rrc_filter.dat"))
# /////////////////////////////////////////////////////////////////////////////
self._samples_per_symbol = samples_per_symbol
self._excess_bw = excess_bw
self._costas_alpha = costas_alpha
- self._gain_mu = gain_mu
- self._mu = mu
- self._omega_relative_limit = omega_relative_limit
+ self._mm_gain_mu = gain_mu
+ self._mm_mu = mu
+ self._mm_omega_relative_limit = omega_relative_limit
self._gray_code = gray_code
if samples_per_symbol < 2:
scale = (1.0/16384.0)
self.pre_scaler = gr.multiply_const_cc(scale) # scale the signal from full-range to +-1
#self.agc = gr.agc2_cc(0.6e-1, 1e-3, 1, 1, 100)
- self.agc = gr.feedforward_agc_cc(16, 1.0)
-
-
- # 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 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)
+ self.agc = gr.feedforward_agc_cc(16, 2.0)
# RRC data filter
- ntaps = 11 * self._samples_per_symbol
+ ntaps = 11 * samples_per_symbol
self.rrc_taps = gr.firdes.root_raised_cosine(
- 1.0, # gain
+ 1.0, # gain
self._samples_per_symbol, # sampling rate
1.0, # symbol rate
self._excess_bw, # excess bandwidth (roll-off factor)
ntaps)
-
- self.rrc_filter=gr.fir_filter_ccf(1, self.rrc_taps)
+ self.rrc_filter=gr.interp_fir_filter_ccf(1, self.rrc_taps)
# symbol clock recovery
- omega = self._samples_per_symbol
- gain_omega = .25 * self._gain_mu * self._gain_mu
- self.clock_recovery=gr.clock_recovery_mm_cc(omega, gain_omega,
- self._mu, self._gain_mu,
- self._omega_relative_limit)
+ if not self._mm_gain_mu:
+ self._mm_gain_mu = 0.1
+
+ self._mm_omega = self._samples_per_symbol
+ self._mm_gain_omega = .25 * self._mm_gain_mu * self._mm_gain_mu
+ self._costas_beta = 0.25 * self._costas_alpha * self._costas_alpha
+ fmin = -0.025
+ fmax = 0.025
+
+ self.receiver=gr.mpsk_receiver_cc(arity, 0,
+ self._costas_alpha, self._costas_beta,
+ fmin, fmax,
+ self._mm_mu, self._mm_gain_mu,
+ self._mm_omega, self._mm_gain_omega,
+ self._mm_omega_relative_limit)
+
+ # Do differential decoding based on phase change of symbols
+ self.diffdec = gr.diff_phasor_cc()
# find closest constellation point
rot = 1
rotated_const = map(lambda pt: pt * rot, psk.constellation[arity])
- #print "rotated_const =", rotated_const
-
- self.diffdec = gr.diff_phasor_cc()
- #self.diffdec = gr.diff_decoder_bb(arity)
-
self.slicer = gr.constellation_decoder_cb(rotated_const, range(arity))
if self._gray_code:
self._setup_logging()
# Connect and Initialize base class
- 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)
- else: # Without Costas Loop
- self._fg.connect(self.pre_scaler, self.agc,
- self.rrc_filter, self.clock_recovery, self.diffdec,
- self.slicer, self.symbol_mapper, self.unpack)
-
+ self._fg.connect(self.pre_scaler, self.agc, self.rrc_filter, self.receiver,
+ self.diffdec, self.slicer, self.symbol_mapper, self.unpack)
gr.hier_block.__init__(self, self._fg, self.pre_scaler, self.unpack)
def samples_per_symbol(self):
bits_per_symbol = staticmethod(bits_per_symbol) # make it a static method. RTFM
def _print_verbage(self):
- 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
- 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
+ print "\nDemodulator:"
+ 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: %.2e" % self._costas_alpha
+ print "Costas Loop beta: %.2e" % self._costas_beta
+ print "M&M mu: %.2f" % self._mm_mu
+ print "M&M mu gain: %.2e" % self._mm_gain_mu
+ print "M&M omega: %.2f" % self._mm_omega
+ print "M&M omega gain: %.2e" % self._mm_gain_omega
+ print "M&M omega limit: %.2f" % self._mm_omega_relative_limit
def _setup_logging(self):
print "Modulation logging turned on."
self._fg.connect(self.pre_scaler,
- gr.file_sink(gr.sizeof_gr_complex, "prescaler.dat"))
+ gr.file_sink(gr.sizeof_gr_complex, "rx_prescaler.dat"))
self._fg.connect(self.agc,
- gr.file_sink(gr.sizeof_gr_complex, "agc.dat"))
- 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),
- gr.file_sink(gr.sizeof_gr_complex, "costas_error.dat"))
+ gr.file_sink(gr.sizeof_gr_complex, "rx_agc.dat"))
self._fg.connect(self.rrc_filter,
- gr.file_sink(gr.sizeof_gr_complex, "rrc_filter.dat"))
- self._fg.connect(self.clock_recovery,
- gr.file_sink(gr.sizeof_gr_complex, "clock_recovery.dat"))
- self._fg.connect((self.clock_recovery,1),
- gr.file_sink(gr.sizeof_gr_complex, "clock_recovery_error.dat"))
+ gr.file_sink(gr.sizeof_gr_complex, "rx_rrc_filter.dat"))
+ self._fg.connect(self.receiver,
+ gr.file_sink(gr.sizeof_gr_complex, "rx_receiver.dat"))
self._fg.connect(self.diffdec,
- gr.file_sink(gr.sizeof_gr_complex, "diffdec.dat"))
+ gr.file_sink(gr.sizeof_gr_complex, "rx_diffdec.dat"))
self._fg.connect(self.slicer,
- gr.file_sink(gr.sizeof_char, "slicer.dat"))
+ gr.file_sink(gr.sizeof_char, "rx_slicer.dat"))
self._fg.connect(self.symbol_mapper,
- gr.file_sink(gr.sizeof_char, "symbol_mapper.dat"))
+ gr.file_sink(gr.sizeof_char, "rx_symbol_mapper.dat"))
self._fg.connect(self.unpack,
- gr.file_sink(gr.sizeof_char, "unpack.dat"))
+ gr.file_sink(gr.sizeof_char, "rx_unpack.dat"))
def add_options(parser):
"""
return modulation_utils.extract_kwargs_from_options(
dbpsk_demod.__init__, ('self', 'fg'), options)
extract_kwargs_from_options=staticmethod(extract_kwargs_from_options)
-
#
# Add these to the mod/demod registry
#
projects / debian / gnuradio / blobdiff