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| author | jcorgan <jcorgan@221aa14e-8319-0410-a670-987f0aec2ac5> | 2007-03-02 02:49:48 +0000 |
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| committer | jcorgan <jcorgan@221aa14e-8319-0410-a670-987f0aec2ac5> | 2007-03-02 02:49:48 +0000 |
| commit | 19a5b154cc5c2cd5f80bcd17d71241572ca7fbd6 (patch) | |
| tree | 291b2b5031144d07ea2368d22f077ce1d82fa9ea /gnuradio-examples/python/hier/sounder/sounder_tx.py | |
| parent | 005d44e0e9281152bde0923e3239772d67e4e730 (diff) | |
Merged r4671:4680 from jcorgan/est into trunk. Pulls in gr-wxgui updates for new hierarchical blocks and work-in-progress channel sounder example.
git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@4681 221aa14e-8319-0410-a670-987f0aec2ac5
Diffstat (limited to 'gnuradio-examples/python/hier/sounder/sounder_tx.py')
| -rw-r--r-- | gnuradio-examples/python/hier/sounder/sounder_tx.py | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/gnuradio-examples/python/hier/sounder/sounder_tx.py b/gnuradio-examples/python/hier/sounder/sounder_tx.py new file mode 100644 index 0000000000..e6a3e84f85 --- /dev/null +++ b/gnuradio-examples/python/hier/sounder/sounder_tx.py @@ -0,0 +1,70 @@ +#!/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_sink import usrp_sink_c +import math + +n2s = eng_notation.num_to_str + +class sounder_tx(gr.hier_block2): + """ + Creates a top-level channel sounder block with the given parameters. + """ + + def __init__(self, subdev_spec, freq, cal, verbose, max_delay, chip_rate, amplitude): + + # Call hierarchical block constructor + # Top-level blocks have no inputs or outputs + gr.hier_block2.__init__(self, + "sounder_tx", # Block typename + gr.io_signature(0,0,0), # Input signature + gr.io_signature(0,0,0)) # Output signature + self._freq = freq + self._cal = cal + self._verbose = verbose + self._max_delay = max_delay + + self._u = usrp_sink_c(0, subdev_spec, chip_rate, self._freq, self._cal, verbose) + self._chip_rate = self._u._if_rate + self._resolution = 1.0/self._chip_rate + + min_chips = int(math.ceil(2.0*self._max_delay * self._chip_rate)) + degree = int(math.ceil(math.log(min_chips)/math.log(2))) + self._length = 2**degree-1 + + self._glfsr = gr.glfsr_source_b(degree) + self._mapper = gr.chunks_to_symbols_bc((-amplitude+0j, amplitude+0j), 1) + + if self._verbose: + print "Actual chip rate is", n2s(self._chip_rate), "chips/sec" + print "Resolution is", n2s(self._resolution), "sec" + print "Using specified maximum delay spread of", self._max_delay, "sec" + print "Mininum sequence length needed is", n2s(min_chips), "chips" + print "Using PN sequence of degree", degree, "length", self._length + print "Output amplitude is", amplitude + + self.define_component("glfsr", self._glfsr) + self.define_component("mapper", self._mapper) + self.define_component("usrp", self._u) + self.connect("glfsr", 0, "mapper", 0) + self.connect("mapper", 0, "usrp", 0) |