From 9be3761d689f512bd1faaaec40baa41ef15286e2 Mon Sep 17 00:00:00 2001
From: Tom Rondeau <trondeau@vt.edu>
Date: Sun, 24 Jul 2011 17:47:18 -0400
Subject: digital: working digital transmit benchmark script to file.
---
gr-digital/examples/transmit_path.py | 119 +++++++++++++++++++++++++++++++++++
1 file changed, 119 insertions(+)
create mode 100644 gr-digital/examples/transmit_path.py
(limited to 'gr-digital/examples/transmit_path.py')
diff --git a/gr-digital/examples/transmit_path.py b/gr-digital/examples/transmit_path.py
new file mode 100644
index 0000000000..91869ad9ad
--- /dev/null
+++ b/gr-digital/examples/transmit_path.py
@@ -0,0 +1,119 @@
+#
+# Copyright 2005-2007,2011 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 3, 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
+from gnuradio import eng_notation
+from gnuradio import digital
+
+import copy
+import sys
+
+# /////////////////////////////////////////////////////////////////////////////
+# transmit path
+# /////////////////////////////////////////////////////////////////////////////
+
+class transmit_path(gr.hier_block2):
+ def __init__(self, modulator_class, options):
+ '''
+ See below for what options should hold
+ '''
+ gr.hier_block2.__init__(self, "transmit_path",
+ gr.io_signature(0, 0, 0), # Input signature
+ gr.io_signature(1, 1, gr.sizeof_gr_complex)) # Output signature
+
+ 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
+ modulator = self._modulator_class(**mod_kwargs)
+ self.packet_transmitter = \
+ digital.mod_pkts(modulator,
+ 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
+ self.connect(self.packet_transmitter, self.amp, self)
+
+ def set_tx_amplitude(self, ampl):
+ """
+ Sets the transmit amplitude sent to the USRP in volts
+ @param: ampl 0 <= ampl < 1.
+ """
+ self._tx_amplitude = max(0.0, min(ampl, 1))
+ 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=0.250, metavar="AMPL",
+ help="set transmitter digital amplitude: 0 <= AMPL < 1 [default=%default]")
+ normal.add_option("-v", "--verbose", action="store_true", default=False)
+
+ expert.add_option("-S", "--samples-per-symbol", type="float", default=None,
+ 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: %.4f" % (self._samples_per_symbol)
+
--
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