mirror of https://gerrit.osmocom.org/osmo-tetra
demod: Import the new GR 3.7 code
This adds demodulator code compatible with gnuradio 3.7 series. Change-Id: Ibaf7f9c552cc1625210a75f2e9ec142ab47ce8d6 Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
This commit is contained in:
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#
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# Copyright 2005,2006,2007 Free Software Foundation, Inc.
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#
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# cqpsk.py (C) Copyright 2009, KA1RBI
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#
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# This file is part of GNU Radio
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#
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# GNU Radio is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3, or (at your option)
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# any later version.
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#
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# GNU Radio is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with GNU Radio; see the file COPYING. If not, write to
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# the Free Software Foundation, Inc., 51 Franklin Street,
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# Boston, MA 02110-1301, USA.
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#
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# See gnuradio-examples/python/digital for examples
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"""
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differential PI/4 CQPSK modulation and demodulation.
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"""
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from gnuradio import gr, gru, analog, blocks, digital, filter
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from math import pi, sqrt
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import cmath
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from pprint import pprint
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# default values (used in __init__ and add_options)
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_def_samples_per_symbol = 10
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_def_excess_bw = 0.35
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_def_gray_code = True
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_def_verbose = False
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_def_log = False
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_def_costas_alpha = 0.15
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_def_gain_mu = None
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_def_mu = 0.5
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_def_omega_relative_limit = 0.005
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# /////////////////////////////////////////////////////////////////////////////
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# CQPSK modulator
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# /////////////////////////////////////////////////////////////////////////////
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class cqpsk_mod(gr.hier_block2):
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def __init__(self,
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samples_per_symbol=_def_samples_per_symbol,
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excess_bw=_def_excess_bw,
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verbose=_def_verbose,
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log=_def_log):
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"""
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Hierarchical block for RRC-filtered QPSK modulation.
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The input is a byte stream (unsigned char) and the
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output is the complex modulated signal at baseband.
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@param samples_per_symbol: samples per symbol >= 2
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@type samples_per_symbol: integer
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@param excess_bw: Root-raised cosine filter excess bandwidth
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@type excess_bw: float
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@param verbose: Print information about modulator?
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@type verbose: bool
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@param debug: Print modualtion data to files?
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@type debug: bool
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"""
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gr.hier_block2.__init__(self, "cqpsk_mod",
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gr.io_signature(1, 1, gr.sizeof_char), # Input signature
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gr.io_signature(1, 1, gr.sizeof_gr_complex)) # Output signature
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self._samples_per_symbol = samples_per_symbol
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self._excess_bw = excess_bw
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if not isinstance(samples_per_symbol, int) or samples_per_symbol < 2:
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raise TypeError, ("sbp must be an integer >= 2, is %d" % samples_per_symbol)
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ntaps = 11 * samples_per_symbol
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arity = 8
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# turn bytes into k-bit vectors
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self.bytes2chunks = \
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gr.packed_to_unpacked_bb(self.bits_per_symbol(), gr.GR_MSB_FIRST)
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# 0 +45 1 [+1]
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# 1 +135 3 [+3]
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# 2 -45 7 [-1]
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# 3 -135 5 [-3]
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self.pi4map = [1, 3, 7, 5]
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self.symbol_mapper = gr.map_bb(self.pi4map)
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self.diffenc = gr.diff_encoder_bb(arity)
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self.chunks2symbols = gr.chunks_to_symbols_bc(psk.constellation[arity])
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# pulse shaping filter
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self.rrc_taps = filter.firdes.root_raised_cosine(
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self._samples_per_symbol, # gain (sps since we're interpolating by sps)
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self._samples_per_symbol, # sampling rate
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1.0, # symbol rate
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self._excess_bw, # excess bandwidth (roll-off factor)
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ntaps)
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self.rrc_filter = filter.interp_fir_filter_ccf(self._samples_per_symbol, self.rrc_taps)
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if verbose:
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self._print_verbage()
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if log:
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self._setup_logging()
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# Connect & Initialize base class
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self.connect(self, self.bytes2chunks, self.symbol_mapper, self.diffenc,
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self.chunks2symbols, self.rrc_filter, self)
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def samples_per_symbol(self):
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return self._samples_per_symbol
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@staticmethod
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def bits_per_symbol():
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return 2
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def _print_verbage(self):
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print "\nModulator:"
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print "bits per symbol: %d" % self.bits_per_symbol()
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print "Gray code: %s" % self._gray_code
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print "RRS roll-off factor: %f" % self._excess_bw
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def _setup_logging(self):
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print "Modulation logging turned on."
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self.connect(self.bytes2chunks,
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gr.file_sink(gr.sizeof_char, "tx_bytes2chunks.dat"))
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self.connect(self.symbol_mapper,
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gr.file_sink(gr.sizeof_char, "tx_graycoder.dat"))
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self.connect(self.diffenc,
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gr.file_sink(gr.sizeof_char, "tx_diffenc.dat"))
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self.connect(self.chunks2symbols,
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gr.file_sink(gr.sizeof_gr_complex, "tx_chunks2symbols.dat"))
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self.connect(self.rrc_filter,
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gr.file_sink(gr.sizeof_gr_complex, "tx_rrc_filter.dat"))
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@staticmethod
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def add_options(parser):
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"""
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Adds QPSK modulation-specific options to the standard parser
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"""
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parser.add_option("", "--excess-bw", type="float", default=_def_excess_bw,
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help="set RRC excess bandwith factor [default=%default] (PSK)")
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parser.add_option("", "--no-gray-code", dest="gray_code",
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action="store_false", default=_def_gray_code,
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help="disable gray coding on modulated bits (PSK)")
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@staticmethod
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def extract_kwargs_from_options(options):
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"""
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Given command line options, create dictionary suitable for passing to __init__
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"""
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return modulation_utils.extract_kwargs_from_options(dqpsk_mod.__init__,
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('self',), options)
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# /////////////////////////////////////////////////////////////////////////////
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# CQPSK demodulator
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#
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# /////////////////////////////////////////////////////////////////////////////
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class cqpsk_demod(gr.hier_block2):
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def __init__(self,
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samples_per_symbol=_def_samples_per_symbol,
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excess_bw=_def_excess_bw,
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costas_alpha=_def_costas_alpha,
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gain_mu=_def_gain_mu,
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mu=_def_mu,
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omega_relative_limit=_def_omega_relative_limit,
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gray_code=_def_gray_code,
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verbose=_def_verbose,
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log=_def_log):
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"""
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Hierarchical block for RRC-filtered CQPSK demodulation
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The input is the complex modulated signal at baseband.
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The output is a stream of floats in [ -3 / -1 / +1 / +3 ]
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@param samples_per_symbol: samples per symbol >= 2
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@type samples_per_symbol: float
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@param excess_bw: Root-raised cosine filter excess bandwidth
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@type excess_bw: float
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@param costas_alpha: loop filter gain
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@type costas_alphas: float
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@param gain_mu: for M&M block
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@type gain_mu: float
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@param mu: for M&M block
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@type mu: float
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@param omega_relative_limit: for M&M block
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@type omega_relative_limit: float
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@param gray_code: Tell modulator to Gray code the bits
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@type gray_code: bool
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@param verbose: Print information about modulator?
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@type verbose: bool
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@param debug: Print modualtion data to files?
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@type debug: bool
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"""
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gr.hier_block2.__init__(self, "cqpsk_demod",
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gr.io_signature(1, 1, gr.sizeof_gr_complex), # Input signature
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gr.io_signature(1, 1, gr.sizeof_float)) # Output signature
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self._samples_per_symbol = samples_per_symbol
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self._excess_bw = excess_bw
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self._costas_alpha = costas_alpha
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self._mm_gain_mu = gain_mu
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self._mm_mu = mu
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self._mm_omega_relative_limit = omega_relative_limit
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self._gray_code = gray_code
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if samples_per_symbol < 2:
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raise TypeError, "sbp must be >= 2, is %d" % samples_per_symbol
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arity = pow(2,self.bits_per_symbol())
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# Automatic gain control
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scale = (1.0/16384.0)
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self.pre_scaler = blocks.multiply_const_cc(scale) # scale the signal from full-range to +-1
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#self.agc = analog.agc2_cc(0.6e-1, 1e-3, 1, 1, 100)
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self.agc = analog.feedforward_agc_cc(16, 2.0)
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# RRC data filter
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ntaps = 11 * samples_per_symbol
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self.rrc_taps = filter.firdes.root_raised_cosine(
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1.0, # gain
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self._samples_per_symbol, # sampling rate
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1.0, # symbol rate
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self._excess_bw, # excess bandwidth (roll-off factor)
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ntaps)
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self.rrc_filter=filter.interp_fir_filter_ccf(1, self.rrc_taps)
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if not self._mm_gain_mu:
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sbs_to_mm = {2: 0.050, 3: 0.075, 4: 0.11, 5: 0.125, 6: 0.15, 7: 0.15}
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self._mm_gain_mu = sbs_to_mm[samples_per_symbol]
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self._mm_omega = self._samples_per_symbol
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self._mm_gain_omega = .25 * self._mm_gain_mu * self._mm_gain_mu
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self._costas_beta = 0.25 * self._costas_alpha * self._costas_alpha
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fmin = -0.025
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fmax = 0.025
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self.receiver=digital.mpsk_receiver_cc(
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arity, pi/4.0,
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2*pi/150,
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fmin, fmax,
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self._mm_mu, self._mm_gain_mu,
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self._mm_omega, self._mm_gain_omega,
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self._mm_omega_relative_limit
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)
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self.receiver.set_alpha(self._costas_alpha)
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self.receiver.set_beta(self._costas_beta)
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# Perform Differential decoding on the constellation
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self.diffdec = digital.diff_phasor_cc()
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# take angle of the difference (in radians)
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self.to_float = blocks.complex_to_arg()
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# convert from radians such that signal is in -3/-1/+1/+3
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self.rescale = blocks.multiply_const_ff( 1 / (pi / 4) )
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if verbose:
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self._print_verbage()
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if log:
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self._setup_logging()
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# Connect & Initialize base class
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self.connect(self, self.pre_scaler, self.agc, self.rrc_filter, self.receiver,
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self.diffdec, self.to_float, self.rescale, self)
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def samples_per_symbol(self):
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return self._samples_per_symbol
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@staticmethod
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def bits_per_symbol():
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return 2
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def _print_verbage(self):
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print "\nDemodulator:"
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print "bits per symbol: %d" % self.bits_per_symbol()
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print "Gray code: %s" % self._gray_code
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print "RRC roll-off factor: %.2f" % self._excess_bw
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print "Costas Loop alpha: %.2e" % self._costas_alpha
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print "Costas Loop beta: %.2e" % self._costas_beta
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print "M&M mu: %.2f" % self._mm_mu
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print "M&M mu gain: %.2e" % self._mm_gain_mu
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print "M&M omega: %.2f" % self._mm_omega
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print "M&M omega gain: %.2e" % self._mm_gain_omega
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print "M&M omega limit: %.2f" % self._mm_omega_relative_limit
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def _setup_logging(self):
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print "Modulation logging turned on."
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self.connect(self.pre_scaler,
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gr.file_sink(gr.sizeof_gr_complex, "rx_prescaler.dat"))
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self.connect(self.agc,
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gr.file_sink(gr.sizeof_gr_complex, "rx_agc.dat"))
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self.connect(self.rrc_filter,
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gr.file_sink(gr.sizeof_gr_complex, "rx_rrc_filter.dat"))
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self.connect(self.receiver,
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gr.file_sink(gr.sizeof_gr_complex, "rx_receiver.dat"))
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self.connect(self.diffdec,
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gr.file_sink(gr.sizeof_gr_complex, "rx_diffdec.dat"))
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self.connect(self.to_float,
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gr.file_sink(gr.sizeof_float, "rx_to_float.dat"))
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self.connect(self.rescale,
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gr.file_sink(gr.sizeof_float, "rx_rescale.dat"))
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@staticmethod
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def add_options(parser):
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"""
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Adds modulation-specific options to the standard parser
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"""
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parser.add_option("", "--excess-bw", type="float", default=_def_excess_bw,
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help="set RRC excess bandwith factor [default=%default] (PSK)")
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parser.add_option("", "--no-gray-code", dest="gray_code",
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action="store_false", default=_def_gray_code,
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help="disable gray coding on modulated bits (PSK)")
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parser.add_option("", "--costas-alpha", type="float", default=_def_costas_alpha,
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help="set Costas loop alpha value [default=%default] (PSK)")
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parser.add_option("", "--gain-mu", type="float", default=_def_gain_mu,
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help="set M&M symbol sync loop gain mu value [default=%default] (PSK)")
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parser.add_option("", "--mu", type="float", default=_def_mu,
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help="set M&M symbol sync loop mu value [default=%default] (PSK)")
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@staticmethod
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def extract_kwargs_from_options(options):
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"""
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Given command line options, create dictionary suitable for passing to __init__
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"""
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return modulation_utils.extract_kwargs_from_options(
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cqpsk_demod.__init__, ('self',), options)
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#!/usr/bin/env python
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# Copyright 2012 Dimitri Stolnikov <horiz0n@gmx.net>
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# Usage:
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# src$ ./demod/python/osmosdr-tetra_demod_fft.py -o /dev/stdout | ./float_to_bits /dev/stdin /dev/stdout | ./tetra-rx /dev/stdin
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#
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# Adjust the center frequency (-f) and gain (-g) according to your needs.
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# Use left click in Wideband Spectrum window to roughly select a TETRA carrier.
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# In Wideband Spectrum you can also tune by 1/4 of the bandwidth by clicking on the rightmost/leftmost spectrum side.
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# Use left click in Channel Spectrum windows to fine tune the carrier by clicking on the left or right side of the spectrum.
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import sys
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import math
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from gnuradio import gr, gru, eng_notation, blocks, filter
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from gnuradio.filter import pfb
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from gnuradio.eng_option import eng_option
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from gnuradio.wxgui import fftsink2, scopesink2, forms, TRIG_MODE_AUTO
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from grc_gnuradio import wxgui as grc_wxgui
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from optparse import OptionParser
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import osmosdr
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import wx
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try:
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import cqpsk
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except:
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from tetra_demod import cqpsk
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# applies frequency translation, resampling and demodulation
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class top_block(grc_wxgui.top_block_gui):
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def __init__(self):
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grc_wxgui.top_block_gui.__init__(self, title="Top Block")
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options = get_options()
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self.ifreq = options.frequency
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self.rfgain = options.gain
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self.src = osmosdr.source(options.args)
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self.src.set_center_freq(self.ifreq)
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self.src.set_sample_rate(int(options.sample_rate))
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if self.rfgain is None:
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self.src.set_gain_mode(1)
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self.iagc = 1
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self.rfgain = 0
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else:
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self.iagc = 0
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self.src.set_gain_mode(0)
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self.src.set_gain(self.rfgain)
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# may differ from the requested rate
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sample_rate = self.src.get_sample_rate()
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sys.stderr.write("sample rate: %d\n" % (sample_rate))
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symbol_rate = 18000
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sps = 2 # output rate will be 36,000
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out_sample_rate = symbol_rate * sps
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options.low_pass = options.low_pass / 2.0
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if sample_rate == 96000: # FunCube Dongle
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first_decim = 2
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else:
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first_decim = 10
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self.offset = 0
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taps = filter.firdes.low_pass(1.0, sample_rate, options.low_pass, options.low_pass * 0.2, filter.firdes.WIN_HANN)
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self.tuner = filter.freq_xlating_fir_filter_ccf(first_decim, taps, self.offset, sample_rate)
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self.demod = cqpsk.cqpsk_demod(
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samples_per_symbol = sps,
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excess_bw=0.35,
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costas_alpha=0.03,
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gain_mu=0.05,
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mu=0.05,
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omega_relative_limit=0.05,
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log=options.log,
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verbose=options.verbose)
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self.output = blocks.file_sink(gr.sizeof_float, options.output_file)
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rerate = float(sample_rate / float(first_decim)) / float(out_sample_rate)
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sys.stderr.write("resampling factor: %f\n" % rerate)
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|
||||
if rerate.is_integer():
|
||||
sys.stderr.write("using pfb decimator\n")
|
||||
self.resamp = pfb.decimator_ccf(int(rerate))
|
||||
else:
|
||||
sys.stderr.write("using pfb resampler\n")
|
||||
self.resamp = pfb.arb_resampler_ccf(1 / rerate)
|
||||
|
||||
self.connect(self.src, self.tuner, self.resamp, self.demod, self.output)
|
||||
|
||||
self.Main = wx.Notebook(self.GetWin(), style=wx.NB_TOP)
|
||||
self.Main.AddPage(grc_wxgui.Panel(self.Main), "Wideband Spectrum")
|
||||
self.Main.AddPage(grc_wxgui.Panel(self.Main), "Channel Spectrum")
|
||||
self.Main.AddPage(grc_wxgui.Panel(self.Main), "Soft Bits")
|
||||
|
||||
def set_ifreq(ifreq):
|
||||
self.ifreq = ifreq
|
||||
self._ifreq_text_box.set_value(self.ifreq)
|
||||
self.src.set_center_freq(self.ifreq)
|
||||
|
||||
self._ifreq_text_box = forms.text_box(
|
||||
parent=self.GetWin(),
|
||||
value=self.ifreq,
|
||||
callback=set_ifreq,
|
||||
label="Center Frequency",
|
||||
converter=forms.float_converter(),
|
||||
)
|
||||
self.Add(self._ifreq_text_box)
|
||||
|
||||
def set_iagc(iagc):
|
||||
self.iagc = iagc
|
||||
self._agc_check_box.set_value(self.iagc)
|
||||
self.src.set_gain_mode(self.iagc, 0)
|
||||
self.src.set_gain(0 if self.iagc == 1 else self.rfgain, 0)
|
||||
|
||||
self._agc_check_box = forms.check_box(
|
||||
parent=self.GetWin(),
|
||||
value=self.iagc,
|
||||
callback=set_iagc,
|
||||
label="Automatic Gain",
|
||||
true=1,
|
||||
false=0,
|
||||
)
|
||||
|
||||
self.Add(self._agc_check_box)
|
||||
|
||||
def set_rfgain(rfgain):
|
||||
self.rfgain = rfgain
|
||||
self._rfgain_slider.set_value(self.rfgain)
|
||||
self._rfgain_text_box.set_value(self.rfgain)
|
||||
self.src.set_gain(0 if self.iagc == 1 else self.rfgain, 0)
|
||||
|
||||
_rfgain_sizer = wx.BoxSizer(wx.VERTICAL)
|
||||
self._rfgain_text_box = forms.text_box(
|
||||
parent=self.GetWin(),
|
||||
sizer=_rfgain_sizer,
|
||||
value=self.rfgain,
|
||||
callback=set_rfgain,
|
||||
label="RF Gain",
|
||||
converter=forms.float_converter(),
|
||||
proportion=0,
|
||||
)
|
||||
self._rfgain_slider = forms.slider(
|
||||
parent=self.GetWin(),
|
||||
sizer=_rfgain_sizer,
|
||||
value=self.rfgain,
|
||||
callback=set_rfgain,
|
||||
minimum=0,
|
||||
maximum=50,
|
||||
num_steps=200,
|
||||
style=wx.SL_HORIZONTAL,
|
||||
cast=float,
|
||||
proportion=1,
|
||||
)
|
||||
|
||||
self.Add(_rfgain_sizer)
|
||||
|
||||
self.Add(self.Main)
|
||||
|
||||
def fftsink2_callback(x, y):
|
||||
if abs(x / (sample_rate / 2)) > 0.9:
|
||||
set_ifreq(self.ifreq + x / 2)
|
||||
else:
|
||||
sys.stderr.write("coarse tuned to: %d Hz\n" % x)
|
||||
self.offset = x
|
||||
self.tuner.set_center_freq(self.offset)
|
||||
|
||||
self.scope = fftsink2.fft_sink_c(self.Main.GetPage(0).GetWin(),
|
||||
title="Wideband Spectrum (click to coarse tune)",
|
||||
fft_size=1024,
|
||||
sample_rate=sample_rate,
|
||||
ref_scale=2.0,
|
||||
ref_level=0,
|
||||
y_divs=10,
|
||||
fft_rate=10,
|
||||
average=False,
|
||||
avg_alpha=0.6)
|
||||
|
||||
self.Main.GetPage(0).Add(self.scope.win)
|
||||
self.scope.set_callback(fftsink2_callback)
|
||||
|
||||
self.connect(self.src, self.scope)
|
||||
|
||||
def fftsink2_callback2(x, y):
|
||||
self.offset = self.offset - (x / 10)
|
||||
sys.stderr.write("fine tuned to: %d Hz\n" % self.offset)
|
||||
self.tuner.set_center_freq(self.offset)
|
||||
|
||||
self.scope2 = fftsink2.fft_sink_c(self.Main.GetPage(1).GetWin(),
|
||||
title="Channel Spectrum (click to fine tune)",
|
||||
fft_size=1024,
|
||||
sample_rate=out_sample_rate,
|
||||
ref_scale=2.0,
|
||||
ref_level=-20,
|
||||
y_divs=10,
|
||||
fft_rate=10,
|
||||
average=False,
|
||||
avg_alpha=0.6)
|
||||
|
||||
self.Main.GetPage(1).Add(self.scope2.win)
|
||||
self.scope2.set_callback(fftsink2_callback2)
|
||||
|
||||
self.connect(self.resamp, self.scope2)
|
||||
|
||||
self.scope3 = scopesink2.scope_sink_f(
|
||||
self.Main.GetPage(2).GetWin(),
|
||||
title="Soft Bits",
|
||||
sample_rate=out_sample_rate,
|
||||
v_scale=0,
|
||||
v_offset=0,
|
||||
t_scale=0.001,
|
||||
ac_couple=False,
|
||||
xy_mode=False,
|
||||
num_inputs=1,
|
||||
trig_mode=TRIG_MODE_AUTO,
|
||||
y_axis_label="Counts",
|
||||
)
|
||||
self.Main.GetPage(2).Add(self.scope3.win)
|
||||
|
||||
self.connect(self.demod, self.scope3)
|
||||
|
||||
def get_options():
|
||||
parser = OptionParser(option_class=eng_option)
|
||||
|
||||
parser.add_option("-a", "--args", type="string", default="",
|
||||
help="gr-osmosdr device arguments")
|
||||
parser.add_option("-s", "--sample-rate", type="eng_float", default=1800000,
|
||||
help="set receiver sample rate (default 1800000)")
|
||||
parser.add_option("-f", "--frequency", type="eng_float", default=394.4e6,
|
||||
help="set receiver center frequency")
|
||||
parser.add_option("-g", "--gain", type="eng_float", default=None,
|
||||
help="set receiver gain")
|
||||
|
||||
# demodulator related settings
|
||||
parser.add_option("-l", "--log", action="store_true", default=False, help="dump debug .dat files")
|
||||
parser.add_option("-L", "--low-pass", type="eng_float", default=25e3, help="low pass cut-off", metavar="Hz")
|
||||
parser.add_option("-o", "--output-file", type="string", default="out.float", help="specify the bit output file")
|
||||
parser.add_option("-v", "--verbose", action="store_true", default=False, help="dump demodulation data")
|
||||
(options, args) = parser.parse_args()
|
||||
if len(args) != 0:
|
||||
parser.print_help()
|
||||
raise SystemExit, 1
|
||||
|
||||
return (options)
|
||||
|
||||
if __name__ == '__main__':
|
||||
tb = top_block()
|
||||
tb.Run(True)
|
Loading…
Reference in New Issue