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from __future__ import unicode_literals
#
# Copyright 2005,2006,2011 Free Software Foundation, Inc.
#
# This file is part of GNU Radio
#
# SPDX-License-Identifier: GPL-3.0-or-later
#
#
from gnuradio import gr
from gnuradio import eng_notation
from gnuradio import digital
from gnuradio import analog
import copy
import sys
# /////////////////////////////////////////////////////////////////////////////
# receive path
# /////////////////////////////////////////////////////////////////////////////
class receive_path(gr.hier_block2):
def __init__(self, rx_callback, options):
gr.hier_block2.__init__(self, "receive_path",
gr.io_signature(1, 1, gr.sizeof_gr_complex),
gr.io_signature(0, 0, 0))
options = copy.copy(options) # make a copy so we can destructively modify
self._verbose = options.verbose
self._log = options.log
self._rx_callback = rx_callback # this callback is fired when there's a packet available
# receiver
self.ofdm_rx = digital.ofdm_demod(options,
callback=self._rx_callback)
# Carrier Sensing Blocks
alpha = 0.001
thresh = 30 # in dB, will have to adjust
self.probe = analog.probe_avg_mag_sqrd_c(thresh,alpha)
self.connect(self, self.ofdm_rx)
self.connect(self.ofdm_rx, self.probe)
# Display some information about the setup
if self._verbose:
self._print_verbage()
def carrier_sensed(self):
"""
Return True if we think carrier is present.
"""
#return self.probe.level() > X
return self.probe.unmuted()
def carrier_threshold(self):
"""
Return current setting in dB.
"""
return self.probe.threshold()
def set_carrier_threshold(self, threshold_in_db):
"""
Set carrier threshold.
Args:
threshold_in_db: set detection threshold (float (dB))
"""
self.probe.set_threshold(threshold_in_db)
@staticmethod
def add_options(normal, expert):
"""
Adds receiver-specific options to the Options Parser
"""
normal.add_option("-W", "--bandwidth", type="eng_float",
default=500e3,
help="set symbol bandwidth [default=%default]")
normal.add_option("-v", "--verbose", action="store_true", default=False)
expert.add_option("", "--log", action="store_true", default=False,
help="Log all parts of flow graph to files (CAUTION: lots of data)")
def _print_verbage(self):
"""
Prints information about the receive path
"""
pass
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