def test_constellation_decoder_cb (self):
symbol_positions = [1 + 0j, 0 + 1j , -1 + 0j, 0 - 1j]
symbol_values_out = [0, 1, 2, 3]
expected_result = ( 0, 3, 2, 1, 0, 0, 3)
src_data = (0.5 + 0j, 0.1 - 1.2j, -0.8 - 0.1j, -0.45 + 0.8j, 0.8 - 0j, 0.5 + 0j, 0.1 - 1.2j)
src = gr.vector_source_c (src_data)
op = gr.constellation_decoder_cb (symbol_positions, symbol_values_out)
dst = gr.vector_sink_b ()
self.fg.connect (src, op)
self.fg.connect (op, dst)
self.fg.run () # run the graph and wait for it to finish
actual_result = dst.data () # fetch the contents of the sink
#print "actual result", actual_result
#print "expected result", expected_result
self.assertFloatTuplesAlmostEqual (expected_result, actual_result)
def test_constellation_decoder_cb(self):
symbol_positions = [1 + 0j, 0 + 1j, -1 + 0j, 0 - 1j]
symbol_values_out = [0, 1, 2, 3]
expected_result = (0, 3, 2, 1, 0, 0, 3)
src_data = (0.5 + 0j, 0.1 - 1.2j, -0.8 - 0.1j, -0.45 + 0.8j, 0.8 - 0j,
0.5 + 0j, 0.1 - 1.2j)
src = gr.vector_source_c(src_data)
op = gr.constellation_decoder_cb(symbol_positions, symbol_values_out)
dst = gr.vector_sink_b()
self.tb.connect(src, op)
self.tb.connect(op, dst)
self.tb.run() # run the graph and wait for it to finish
actual_result = dst.data() # fetch the contents of the sink
#print "actual result", actual_result
#print "expected result", expected_result
self.assertFloatTuplesAlmostEqual(expected_result, actual_result)
def __init__(self,
samples_per_symbol=_def_samples_per_symbol,
excess_bw=_def_excess_bw,
costas_alpha=_def_costas_alpha,
gain_mu=_def_gain_mu,
mu=_def_mu,
omega_relative_limit=_def_omega_relative_limit,
gray_code=_def_gray_code,
verbose=_def_verbose,
log=_def_log):
"""
Hierarchical block for RRC-filtered DQPSK demodulation
The input is the complex modulated signal at baseband.
The output is a stream of bits packed 1 bit per byte (LSB)
@param samples_per_symbol: samples per symbol >= 2
@type samples_per_symbol: float
@param excess_bw: Root-raised cosine filter excess bandwidth
@type excess_bw: float
@param costas_alpha: loop filter gain
@type costas_alphas: float
@param gain_mu: for M&M block
@type gain_mu: float
@param mu: for M&M block
@type mu: float
@param omega_relative_limit: for M&M block
@type omega_relative_limit: float
@param gray_code: Tell modulator to Gray code the bits
@type gray_code: bool
@param verbose: Print information about modulator?
@type verbose: bool
@param debug: Print modualtion data to files?
@type debug: bool
"""
gr.hier_block2.__init__(
self,
"dqpsk_demod",
gr.io_signature(1, 1, gr.sizeof_gr_complex), # Input signature
gr.io_signature(1, 1, gr.sizeof_char)) # Output signature
self._samples_per_symbol = samples_per_symbol
self._excess_bw = excess_bw
self._costas_alpha = costas_alpha
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:
raise TypeError, "sbp must be >= 2, is %d" % samples_per_symbol
arity = pow(2, self.bits_per_symbol())
# Automatic gain control
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, 2.0)
# RRC data filter
ntaps = 11 * samples_per_symbol
self.rrc_taps = gr.firdes.root_raised_cosine(
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.interp_fir_filter_ccf(1, self.rrc_taps)
if not self._mm_gain_mu:
sbs_to_mm = {
2: 0.050,
3: 0.075,
4: 0.11,
5: 0.125,
6: 0.15,
7: 0.15
}
self._mm_gain_mu = sbs_to_mm[samples_per_symbol]
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 = -0.25
fmax = 0.25
self.receiver = gr.mpsk_receiver_cc(
arity, pi / 4.0, 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)
# Perform Differential decoding on the constellation
self.diffdec = gr.diff_phasor_cc()
# find closest constellation point
rot = 1
rotated_const = map(lambda pt: pt * rot, psk.constellation[arity])
self.slicer = gr.constellation_decoder_cb(rotated_const, range(arity))
if self._gray_code:
self.symbol_mapper = gr.map_bb(psk.gray_to_binary[arity])
else:
self.symbol_mapper = gr.map_bb(psk.ungray_to_binary[arity])
# unpack the k bit vector into a stream of bits
self.unpack = gr.unpack_k_bits_bb(self.bits_per_symbol())
if verbose:
self._print_verbage()
if log:
self._setup_logging()
# Connect & Initialize base class
self.connect(self, self.pre_scaler, self.agc, self.rrc_filter,
self.receiver, self.diffdec, self.slicer,
self.symbol_mapper, self.unpack, self)
def __init__(self,
samples_per_symbol=_def_samples_per_symbol,
excess_bw=_def_excess_bw,
costas_alpha=_def_costas_alpha,
timing_alpha=_def_timing_alpha,
timing_max_dev=_def_timing_max_dev,
gray_code=_def_gray_code,
verbose=_def_verbose,
log=_def_log):
"""
Hierarchical block for RRC-filtered DQPSK demodulation
The input is the complex modulated signal at baseband.
The output is a stream of bits packed 1 bit per byte (LSB)
@param samples_per_symbol: samples per symbol >= 2
@type samples_per_symbol: float
@param excess_bw: Root-raised cosine filter excess bandwidth
@type excess_bw: float
@param costas_alpha: loop filter gain
@type costas_alphas: float
@param timing_alpha: timing loop alpha gain
@type timing_alpha: float
@param timing_max: timing loop maximum rate deviations
@type timing_max: float
@param gray_code: Tell modulator to Gray code the bits
@type gray_code: bool
@param verbose: Print information about modulator?
@type verbose: bool
@param debug: Print modualtion data to files?
@type debug: bool
"""
gr.hier_block2.__init__(self, "dqpsk2_demod",
gr.io_signature(1, 1, gr.sizeof_gr_complex), # Input signature
gr.io_signature(1, 1, gr.sizeof_char)) # Output signature
self._samples_per_symbol = samples_per_symbol
self._excess_bw = excess_bw
self._costas_alpha = costas_alpha
self._timing_alpha = timing_alpha
self._timing_beta = _def_timing_beta
self._timing_max_dev=timing_max_dev
self._gray_code = gray_code
if samples_per_symbol < 2:
raise TypeError, "sbp must be >= 2, is %d" % samples_per_symbol
arity = pow(2,self.bits_per_symbol())
# Automatic gain control
self.agc = gr.agc2_cc(0.6e-1, 1e-3, 1, 1, 100)
#self.agc = gr.feedforward_agc_cc(16, 2.0)
self._costas_beta = 0.25 * self._costas_alpha * self._costas_alpha
# Allow a frequency swing of +/- half of the sample rate
fmin = -0.5
fmax = 0.5
self.clock_recov = gr.costas_loop_cc(self._costas_alpha,
self._costas_beta,
fmax, fmin, arity)
# symbol timing recovery with RRC data filter
nfilts = 32
ntaps = 11 * samples_per_symbol*nfilts
taps = gr.firdes.root_raised_cosine(nfilts, nfilts, 1.0/float(self._samples_per_symbol), self._excess_bw, ntaps)
self.time_recov = gr.pfb_clock_sync_ccf(self._samples_per_symbol,
self._timing_alpha,
taps, nfilts, nfilts/2, self._timing_max_dev)
self.time_recov.set_beta(self._timing_beta)
# Perform Differential decoding on the constellation
self.diffdec = gr.diff_phasor_cc()
# find closest constellation point
rot = 1
rotated_const = map(lambda pt: pt * rot, psk.constellation[arity])
self.slicer = gr.constellation_decoder_cb(rotated_const, range(arity))
if self._gray_code:
self.symbol_mapper = gr.map_bb(psk.gray_to_binary[arity])
else:
self.symbol_mapper = gr.map_bb(psk.ungray_to_binary[arity])
# unpack the k bit vector into a stream of bits
self.unpack = gr.unpack_k_bits_bb(self.bits_per_symbol())
if verbose:
self._print_verbage()
if log:
self._setup_logging()
# Connect
self.connect(self, self.agc,
self.clock_recov,
self.time_recov,
self.diffdec, self.slicer, self.symbol_mapper, self.unpack, self)
def __init__(self, fg,
samples_per_symbol=_def_samples_per_symbol,
excess_bw=_def_excess_bw,
costas_alpha=_def_costas_alpha,
gain_mu=_def_gain_mu,
mu=_def_mu,
omega_relative_limit=_def_omega_relative_limit,
gray_code=_def_gray_code,
verbose=_def_verbose,
log=_def_log):
"""
Hierarchical block for RRC-filtered DQPSK demodulation
The input is the complex modulated signal at baseband.
The output is a stream of bits packed 1 bit per byte (LSB)
@param fg: flow graph
@type fg: flow graph
@param samples_per_symbol: samples per symbol >= 2
@type samples_per_symbol: float
@param excess_bw: Root-raised cosine filter excess bandwidth
@type excess_bw: float
@param costas_alpha: loop filter gain
@type costas_alphas: float
@param gain_mu: for M&M block
@type gain_mu: float
@param mu: for M&M block
@type mu: float
@param omega_relative_limit: for M&M block
@type omega_relative_limit: float
@param gray_code: Tell modulator to Gray code the bits
@type gray_code: bool
@param verbose: Print information about modulator?
@type verbose: bool
@param debug: Print modualtion data to files?
@type debug: bool
"""
self._fg = fg
self._samples_per_symbol = samples_per_symbol
self._excess_bw = excess_bw
self._costas_alpha = costas_alpha
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:
raise TypeError, "sbp must be >= 2, is %d" % samples_per_symbol
arity = pow(2,self.bits_per_symbol())
# Automatic gain control
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, 2.0)
# RRC data filter
ntaps = 11 * samples_per_symbol
self.rrc_taps = gr.firdes.root_raised_cosine(
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.interp_fir_filter_ccf(1, self.rrc_taps)
if not self._mm_gain_mu:
sbs_to_mm = {2: 0.050, 3: 0.075, 4: 0.11, 5: 0.125, 6: 0.15, 7: 0.15}
self._mm_gain_mu = sbs_to_mm[samples_per_symbol]
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, pi/4.0,
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)
# Perform Differential decoding on the constellation
self.diffdec = gr.diff_phasor_cc()
# find closest constellation point
rot = 1
rotated_const = map(lambda pt: pt * rot, psk.constellation[arity])
self.slicer = gr.constellation_decoder_cb(rotated_const, range(arity))
if self._gray_code:
self.symbol_mapper = gr.map_bb(psk.gray_to_binary[arity])
else:
self.symbol_mapper = gr.map_bb(psk.ungray_to_binary[arity])
# unpack the k bit vector into a stream of bits
self.unpack = gr.unpack_k_bits_bb(self.bits_per_symbol())
if verbose:
self._print_verbage()
if log:
self._setup_logging()
# Connect & Initialize base class
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 __init__(self,
samples_per_symbol=_def_samples_per_symbol,
excess_bw=_def_excess_bw,
freq_alpha=_def_freq_alpha,
phase_alpha=_def_phase_alpha,
timing_alpha=_def_timing_alpha,
timing_max_dev=_def_timing_max_dev,
gray_code=_def_gray_code,
verbose=_def_verbose,
log=_def_log,
sync_out=False):
"""
Hierarchical block for RRC-filtered DQPSK demodulation
The input is the complex modulated signal at baseband.
The output is a stream of bits packed 1 bit per byte (LSB)
@param samples_per_symbol: samples per symbol >= 2
@type samples_per_symbol: float
@param excess_bw: Root-raised cosine filter excess bandwidth
@type excess_bw: float
@param freq_alpha: loop filter gain for frequency recovery
@type freq_alpha: float
@param phase_alpha: loop filter gain
@type phase_alphas: float
@param timing_alpha: timing loop alpha gain
@type timing_alpha: float
@param timing_max: timing loop maximum rate deviations
@type timing_max: float
@param gray_code: Tell modulator to Gray code the bits
@type gray_code: bool
@param verbose: Print information about modulator?
@type verbose: bool
@param log: Print modualtion data to files?
@type log: bool
@param sync_out: Output a sync signal on :1?
@type sync_out: bool
"""
if sync_out:
io_sig_out = gr.io_signaturev(
2, 2, (gr.sizeof_char, gr.sizeof_gr_complex))
else:
io_sig_out = gr.io_signature(1, 1, gr.sizeof_char)
gr.hier_block2.__init__(
self,
"dqpsk2_demod",
gr.io_signature(1, 1, gr.sizeof_gr_complex), # Input signature
io_sig_out) # Output signature
self._samples_per_symbol = samples_per_symbol
self._excess_bw = excess_bw
self._freq_alpha = freq_alpha
self._freq_beta = 0.25 * self._freq_alpha**2
self._phase_alpha = phase_alpha
self._timing_alpha = timing_alpha
self._timing_beta = _def_timing_beta
self._timing_max_dev = timing_max_dev
self._gray_code = gray_code
if samples_per_symbol < 2:
raise TypeError, "sbp must be >= 2, is %d" % samples_per_symbol
arity = pow(2, self.bits_per_symbol())
# Automatic gain control
self.agc = gr.agc2_cc(0.6e-1, 1e-3, 1, 1, 100)
#self.agc = gr.feedforward_agc_cc(16, 2.0)
# Frequency correction
self.freq_recov = gr.fll_band_edge_cc(
self._samples_per_symbol, self._excess_bw,
11 * int(self._samples_per_symbol), self._freq_alpha,
self._freq_beta)
# symbol timing recovery with RRC data filter
nfilts = 32
ntaps = 11 * int(samples_per_symbol * nfilts)
taps = gr.firdes.root_raised_cosine(
nfilts, nfilts, 1.0 / float(self._samples_per_symbol),
self._excess_bw, ntaps)
self.time_recov = gr.pfb_clock_sync_ccf(self._samples_per_symbol,
self._timing_alpha, taps,
nfilts, nfilts / 2,
self._timing_max_dev)
self.time_recov.set_beta(self._timing_beta)
# Perform phase / fine frequency correction
self._phase_beta = 0.25 * self._phase_alpha * self._phase_alpha
# Allow a frequency swing of +/- half of the sample rate
fmin = -0.5
fmax = 0.5
self.phase_recov = gr.costas_loop_cc(self._phase_alpha,
self._phase_beta, fmax, fmin,
arity)
# Perform Differential decoding on the constellation
self.diffdec = gr.diff_phasor_cc()
# find closest constellation point
rot = 1
rotated_const = map(lambda pt: pt * rot, psk.constellation[arity])
self.slicer = gr.constellation_decoder_cb(rotated_const, range(arity))
if self._gray_code:
self.symbol_mapper = gr.map_bb(psk.gray_to_binary[arity])
else:
self.symbol_mapper = gr.map_bb(psk.ungray_to_binary[arity])
# unpack the k bit vector into a stream of bits
self.unpack = gr.unpack_k_bits_bb(self.bits_per_symbol())
if verbose:
self._print_verbage()
if log:
self._setup_logging()
# Connect
self.connect(self, self.agc, self.freq_recov, self.time_recov,
self.phase_recov, self.diffdec, self.slicer,
self.symbol_mapper, self.unpack, self)
if sync_out: self.connect(self.time_recov, (self, 1))