From 28e086141aead2e43f958f0ae14d58cac557fa2d Mon Sep 17 00:00:00 2001
From: trondeau <trondeau@221aa14e-8319-0410-a670-987f0aec2ac5>
Date: Wed, 7 Mar 2007 04:31:19 +0000
Subject: merged trondeau/digital-wip2 r4193:4730 into trunk - improves digital
receiver and fixes ticket:72
git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@4731 221aa14e-8319-0410-a670-987f0aec2ac5
---
.../python/digital/transmit_path_lb.py | 117 +++++++++++++++++++++
1 file changed, 117 insertions(+)
create mode 100644 gnuradio-examples/python/digital/transmit_path_lb.py
(limited to 'gnuradio-examples/python/digital/transmit_path_lb.py')
diff --git a/gnuradio-examples/python/digital/transmit_path_lb.py b/gnuradio-examples/python/digital/transmit_path_lb.py
new file mode 100644
index 0000000000..cd2c871d47
--- /dev/null
+++ b/gnuradio-examples/python/digital/transmit_path_lb.py
@@ -0,0 +1,117 @@
+#
+# Copyright 2005,2006 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, gru, blks
+from gnuradio import eng_notation
+
+import copy
+import sys
+
+# /////////////////////////////////////////////////////////////////////////////
+# transmit path
+# /////////////////////////////////////////////////////////////////////////////
+
+class transmit_path(gr.hier_block):
+ def __init__(self, fg, modulator_class, options):
+ '''
+ See below for what options should hold
+ '''
+
+ options = copy.copy(options) # make a copy so we can destructively modify
+
+ self._verbose = options.verbose
+ self._tx_amplitude = options.tx_amplitude # digital amplitude sent to USRP
+ self._bitrate = options.bitrate # desired bit rate
+ self._samples_per_symbol = options.samples_per_symbol # desired samples/baud
+
+ self._modulator_class = modulator_class # the modulator_class we are using
+
+ # Get mod_kwargs
+ mod_kwargs = self._modulator_class.extract_kwargs_from_options(options)
+
+ # transmitter
+ self.packet_transmitter = \
+ blks.mod_pkts(fg,
+ self._modulator_class(fg, **mod_kwargs),
+ access_code=None,
+ msgq_limit=4,
+ pad_for_usrp=True)
+
+ self.amp = gr.multiply_const_cc(1)
+ self.set_tx_amplitude(self._tx_amplitude)
+
+ # Display some information about the setup
+ if self._verbose:
+ self._print_verbage()
+
+ # Connect components in the flowgraph
+ fg.connect(self.packet_transmitter, self.amp)
+
+ gr.hier_block.__init__(self, fg, None, self.amp)
+
+ def set_tx_amplitude(self, ampl):
+ """
+ Sets the transmit amplitude sent to the USRP
+ @param: ampl 0 <= ampl < 32768. Try 8000
+ """
+ self._tx_amplitude = max(0.0, min(ampl, 32767.0))
+ self.amp.set_k(self._tx_amplitude)
+
+ def send_pkt(self, payload='', eof=False):
+ """
+ Calls the transmitter method to send a packet
+ """
+ return self.packet_transmitter.send_pkt(payload, eof)
+
+ def bitrate(self):
+ return self._bitrate
+
+ def samples_per_symbol(self):
+ return self._samples_per_symbol
+
+ def add_options(normal, expert):
+ """
+ Adds transmitter-specific options to the Options Parser
+ """
+ if not normal.has_option('--bitrate'):
+ normal.add_option("-r", "--bitrate", type="eng_float", default=100e3,
+ help="specify bitrate [default=%default].")
+ normal.add_option("", "--tx-amplitude", type="eng_float", default=12000, metavar="AMPL",
+ help="set transmitter digital amplitude: 0 <= AMPL < 32768 [default=%default]")
+ normal.add_option("-v", "--verbose", action="store_true", default=False)
+
+ expert.add_option("-S", "--samples-per-symbol", type="int", default=2,
+ help="set samples/symbol [default=%default]")
+ expert.add_option("", "--log", action="store_true", default=False,
+ help="Log all parts of flow graph to file (CAUTION: lots of data)")
+
+ # Make a static method to call before instantiation
+ add_options = staticmethod(add_options)
+
+ def _print_verbage(self):
+ """
+ Prints information about the transmit path
+ """
+ print "Tx amplitude %s" % (self._tx_amplitude)
+ print "modulation: %s" % (self._modulator_class.__name__)
+ print "bitrate: %sb/s" % (eng_notation.num_to_str(self._bitrate))
+ print "samples/symbol: %3d" % (self._samples_per_symbol)
+
--
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