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[Commit-gnuradio] r4439 - in gnuradio/branches/developers/jcorgan/dect/g
From: |
jcorgan |
Subject: |
[Commit-gnuradio] r4439 - in gnuradio/branches/developers/jcorgan/dect/gnuradio-examples/python: . dect |
Date: |
Sat, 10 Feb 2007 09:36:40 -0700 (MST) |
Author: jcorgan
Date: 2007-02-10 09:36:40 -0700 (Sat, 10 Feb 2007)
New Revision: 4439
Added:
gnuradio/branches/developers/jcorgan/dect/gnuradio-examples/python/dect/
gnuradio/branches/developers/jcorgan/dect/gnuradio-examples/python/dect/Makefile.am
gnuradio/branches/developers/jcorgan/dect/gnuradio-examples/python/dect/README
gnuradio/branches/developers/jcorgan/dect/gnuradio-examples/python/dect/usrp_dect.py
Log:
Work in progress.
Added:
gnuradio/branches/developers/jcorgan/dect/gnuradio-examples/python/dect/Makefile.am
===================================================================
---
gnuradio/branches/developers/jcorgan/dect/gnuradio-examples/python/dect/Makefile.am
(rev 0)
+++
gnuradio/branches/developers/jcorgan/dect/gnuradio-examples/python/dect/Makefile.am
2007-02-10 16:36:40 UTC (rev 4439)
@@ -0,0 +1,25 @@
+#
+# 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.
+#
+
+EXTRA_DIST = \
+ usrp_dect.py
+
+MOSTLYCLEANFILES = *.pyc
Added:
gnuradio/branches/developers/jcorgan/dect/gnuradio-examples/python/dect/README
===================================================================
---
gnuradio/branches/developers/jcorgan/dect/gnuradio-examples/python/dect/README
(rev 0)
+++
gnuradio/branches/developers/jcorgan/dect/gnuradio-examples/python/dect/README
2007-02-10 16:36:40 UTC (rev 4439)
@@ -0,0 +1,16 @@
+This directory contains a work in progress service monitor for DECT
+digital cordless phone base stations and handsets.
+
+In the US, the FCC has allocated four carrier frequencies for DECT usage:
+
+Channel Frequency
+------- ---------
+ 1 1921.536 MHz
+ 2 1923.264 MHz
+ 3 1924.992 MHz
+ 4 1926.720 MHz
+
+These are spaced at 1.728 MHz intervals.
+
+The DECT PHY uses GMSK with a 0.5 bit-time product at 1.152 Msym/sec,
+for an occupied bandwidth (99% power) of 1.186 MHz (1.03 x symbol rate.)
Added:
gnuradio/branches/developers/jcorgan/dect/gnuradio-examples/python/dect/usrp_dect.py
===================================================================
---
gnuradio/branches/developers/jcorgan/dect/gnuradio-examples/python/dect/usrp_dect.py
(rev 0)
+++
gnuradio/branches/developers/jcorgan/dect/gnuradio-examples/python/dect/usrp_dect.py
2007-02-10 16:36:40 UTC (rev 4439)
@@ -0,0 +1,193 @@
+#!/usr/bin/env python
+#
+# Copyright 2004,2005,2007 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
+from gnuradio import gru
+from gnuradio import usrp
+from gnuradio import optfir
+from gnuradio import eng_notation
+from gnuradio.eng_option import eng_option
+from optparse import OptionParser
+
+class usrp_source_c(gr.hier_block2):
+ """
+ Create a USRP source object supplying complex floats.
+
+ Selects user supplied subdevice or chooses first available one.
+
+ Calibration value is the offset from the tuned frequency to
+ the actual frequency.
+ """
+ def __init__(self, fg, which=0, subdev_spec=None, decim=None, gain=None,
freq=None, calibration=None):
+ # Call hierarchical block constructor
+ # Top-level blocks have no inputs or outputs
+ gr.hier_block2.__init__(self,
+ "usrp_source_c", #
Block typename
+ gr.io_signature(0,0,0), #
Input signature
+ gr.io_signature(1,1,gr.sizeof_gr_complex)) #
Output signature
+
+ self._u = usrp.source_c(which)
+ self.set_subdev(subdev_spec)
+ self.set_decim_rate(decim)
+ self.set_gain(gain)
+ self.set_calibration(gain)
+ self.tune(freq)
+
+ self.define_component("usrp", self._u)
+ self.connect("usrp", 0, "self", 0)
+
+ def set_subdev(self, subdev_spec):
+ if subdev_spec is None:
+ subdev_spec = self.pick_subdevice()
+ self._subdev = usrp.selected_subdev(self._u, subdev_spec)
+ self._u.set_mux(usrp.determine_rx_mux_value(self._u, subdev_spec))
+
+ def pick_subdevice(self):
+ """
+ The user didn't specify a subdevice.
+ If there's a daughterboard on A, select A.
+ If there's a daughterboard on B, select B.
+ Otherwise, select A.
+ """
+ if self._u.db[0][0].dbid() >= 0: # dbid is < 0 if there's no
d'board or a problem
+ return (0, 0)
+ if self._u.db[1][0].dbid() >= 0:
+ return (1, 0)
+ return (0, 0)
+
+ def set_decim_rate(self, decim):
+ if decim is None:
+ decim = 256 # Max receive decimation
+ self._decim = decim
+ self._u.set_decim_rate(self._decim)
+
+ def set_gain(self, gain):
+ # If no gain specified, set to midrange
+ if gain is None:
+ g = self._subdev.gain_range()
+ gain = (g[0]+g[1])/2.0
+ self._gain = gain
+ self._subdev.set_gain(self._gain)
+
+ def set_calibration(self, calibration):
+ if calibration is None:
+ calibration = 0.0
+ self._cal = calibration
+
+ def tune(self, freq):
+ """
+ Set the center frequency we're interested in.
+
+ @param target_freq: frequency in Hz
+ @rypte: bool
+
+ Tuning is a two step process. First we ask the front-end to
+ tune as close to the desired frequency as it can. Then we use
+ the result of that operation and our target_frequency to
+ determine the value for the digital down converter. (NOT IMPLEMENTED)
+ """
+ self._residual = usrp.tune(self._u, 0, self._subdev, freq)
+ if self._residual:
+ return True
+
+ return False
+
+ def rate(self):
+ return self._u.adc_rate()/self._decim
+
+
+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
+
+ # Get 2 MHz swath at channel frequency
+ options.decim = 32
+ self._usrp = usrp_source_c(self,
+ which=0,
+ subdev_spec=options.rx_subdev_spec,
+ decim=options.decim,
+ gain=options.gain,
+ freq=options.freq,
+ calibration=options.calibration)
+
+ # Filter baseband to 1.186 MHz passband, 1.728 MHz stopband
+ chan_taps = optfir.low_pass(1.0, # Gain
+ 2e6, # Sample rate
+ 593e3, # One sided modulation
bandwidth
+ 864e3, # One sided channel
bandwidth
+ 0.1, # Passband ripple
+ 60) # Stopband attenuation
+ 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
+ 2e6) #
Sample rate
+
+ # Log baseband to file if requested
+ if options.log_baseband is not None:
+ self._sink = gr.file_sink(gr.sizeof_gr_complex,
options.log_baseband)
+ else:
+ self._sink = gr.null_sink(gr.sizeof_gr_complex)
+
+ self.define_component("usrp", self._usrp)
+ self.define_component("channel", self._channel_filter)
+ self.define_component("sink", self._sink)
+
+ self.connect("usrp", 0, "channel", 0)
+ self.connect("channel", 0, "sink", 0)
+
+def main():
+ parser = OptionParser(option_class=eng_option)
+ parser.add_option("-R", "--rx-subdev-spec", type="subdev",
default=None,
+ help="select USRP Rx side A or B (default=first one
with a daughterboard)")
+ parser.add_option("-f", "--freq", type="eng_float", default=None,
+ help="set frequency to FREQ", metavar="FREQ")
+ parser.add_option("", "--calibration", type="eng_float", default=0.0,
+ help="set frequency calibration offset to FREQ")
+ parser.add_option("-g", "--gain", type="eng_float", default=None,
+ help="set gain in dB (default is midpoint)")
+ parser.add_option("", "--log-baseband", default=None,
+ help="log filtered basedband to file")
+ (options, args) = parser.parse_args()
+ if len(args) != 0:
+ parser.print_help()
+ sys.exit(1)
+
+ # Create an instance of a hierarchical block
+ top_block = dect_receiver(options)
+
+ # Create an instance of a runtime, passing it the top block
+ # to process
+ runtime = gr.runtime(top_block)
+
+ try:
+ # Run forever
+ runtime.run()
+ except KeyboardInterrupt:
+ # Ctrl-C exits
+ pass
+
+if __name__ == '__main__':
+ main ()
Property changes on:
gnuradio/branches/developers/jcorgan/dect/gnuradio-examples/python/dect/usrp_dect.py
___________________________________________________________________
Name: svn:executable
+ *
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