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#!/usr/bin/env python
#
# Copyright 2007 Free Software Foundation, Inc.
#
# This file is part of GNU Radio
#
# GNU Radio is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
#
# GNU Radio is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GNU Radio; see the file COPYING. If not, write to
# the Free Software Foundation, Inc., 51 Franklin Street,
# Boston, MA 02110-1301, USA.
#
from gnuradio import gr, usrp, eng_notation
from usrp_source import usrp_source_c
import math
n2s = eng_notation.num_to_str
class sounder_rx(gr.hier_block2):
"""
Creates a channel sounder receiver block with the given parameters.
"""
def __init__(self, chip_rate, degree, verbose):
# Call hierarchical block constructor
# Top-level blocks have no inputs or outputs
gr.hier_block2.__init__(self,
"sounder_rx", # Block typename
gr.io_signature(1, 1, gr.sizeof_gr_complex), # Input signature
gr.io_signature(1, 1, gr.sizeof_gr_complex)) # Output signature
self._degree = degree
self._chip_rate = chip_rate
self._verbose = verbose
self._length = 2**self._degree-1
self._rep_rate = self._chip_rate/float(self._length)
if self._verbose:
print "Using PN sequence of degree", self._degree, "length", self._length
print "Sequence repetition rate is", n2s(self._rep_rate), "per sec"
self.define_component("corr", gr.pn_correlator_cc(self._degree))
self.connect("self", 0, "corr", 0)
self.connect("corr", 0, "self", 0)
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