From 0825379873157f65ebbcdaeed47da5bd760c5276 Mon Sep 17 00:00:00 2001
From: jcorgan <jcorgan@221aa14e-8319-0410-a670-987f0aec2ac5>
Date: Tue, 3 Apr 2007 19:53:50 +0000
Subject: Merged r4429:4857 from developer branch jcorgan/dect into trunk,
passes distcheck.
git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@4858 221aa14e-8319-0410-a670-987f0aec2ac5
---
.../python/hier/dect/dect_receiver.py | 91 ++++++++++++++++++++++
1 file changed, 91 insertions(+)
create mode 100644 gnuradio-examples/python/hier/dect/dect_receiver.py
(limited to 'gnuradio-examples/python/hier/dect/dect_receiver.py')
diff --git a/gnuradio-examples/python/hier/dect/dect_receiver.py b/gnuradio-examples/python/hier/dect/dect_receiver.py
new file mode 100644
index 0000000000..491159a317
--- /dev/null
+++ b/gnuradio-examples/python/hier/dect/dect_receiver.py
@@ -0,0 +1,91 @@
+#!/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, optfir
+from usrp_source import usrp_source_c
+from gmsk2 import gmsk2_demod
+
+_dect_symbol_rate = 1.152e6
+_dect_occupied_bandwidth = _dect_symbol_rate * 1.03 # BT=0.5
+_dect_channel_bandwidth = 1.728e6
+
+# Top-level hierarchical block that implements DECT demodulation and
+# decoding.
+class dect_receiver(gr.hier_block2):
+ def __init__(self, options):
+ gr.hier_block2.__init__(self,
+ "dect_receiver", # Block typename
+ gr.io_signature(0,0,0), # Input signature
+ gr.io_signature(0,0,0)) # Output signature
+ self._options = options
+
+ # Need greater than 2 samples per symbol. This makes a decimation
+ # rate of 26 and a samples per symbol of 2.136752
+ if_rate = 2.461538e6
+ self._usrp = usrp_source_c(self,
+ which=0,
+ subdev_spec=options.rx_subdev_spec,
+ if_rate=if_rate,
+ gain=options.gain,
+ freq=options.freq,
+ calibration=options.calibration,
+ verbose=options.verbose)
+
+ # Filter baseband to 1.186 MHz passband, 1.728 MHz stopband
+ chan_taps = optfir.low_pass(1.0, # Gain
+ if_rate, # Sample rate
+ _dect_occupied_bandwidth/2, # One sided modulation bandwidth
+ _dect_channel_bandwidth/2, # One sided channel bandwidth
+ 1.0, # Passband ripple (db)
+ 60) # Stopband attenuation (db)
+ if self._options.verbose:
+ print "Channel filter has", len(chan_taps), "taps"
+ self._channel_filter = gr.freq_xlating_fir_filter_ccf(1, # Decimation rate
+ chan_taps, # Filter taps
+ 0.0, # Offset frequency
+ if_rate) # Sample rate
+
+ self._demod = gmsk2_demod(samples_per_symbol=if_rate/_dect_symbol_rate,
+ verbose=options.verbose)
+
+ # Define and connect components
+ self.define_component("usrp", self._usrp)
+ self.define_component("channel", self._channel_filter)
+ self.define_component("demod", self._demod)
+ self.define_component("sink", gr.null_sink(gr.sizeof_char))
+ self.connect("usrp", 0, "channel", 0)
+ self.connect("channel", 0, "demod", 0)
+ self.connect("demod", 0, "sink", 0)
+
+ # Log baseband to file if requested
+ if options.log_baseband is not None:
+ if options.verbose:
+ print "Logging baseband to file", options.log_baseband
+ self.define_component("baseband_log", gr.file_sink(gr.sizeof_gr_complex, options.log_baseband))
+ self.connect("channel", 0, "baseband_log", 0)
+
+ # Log demodulator output to file if requested
+ if options.log_demod is not None:
+ if options.verbose:
+ print "Logging demodulator to file", options.log_demod
+ self.define_component("demod_log", gr.file_sink(gr.sizeof_char, options.log_demod))
+ self.connect("demod", 0, "demod_log", 0)
--
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