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#!/usr/bin/env python
#
# Copyright 2007,2010,2011 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, gr_unittest
try: import pmt
except: from gruel import pmt
import digital_swig as digital
class test_ofdm_cyclic_prefixer (gr_unittest.TestCase):
def setUp (self):
self.tb = gr.top_block ()
def tearDown (self):
self.tb = None
def test_wo_tags_no_rolloff(self):
" The easiest test: make sure the CP is added correctly. "
fft_len = 8
cp_len = 2
expected_result = (6, 7, 0, 1, 2, 3, 4, 5, 6, 7,
6, 7, 0, 1, 2, 3, 4, 5, 6, 7)
src = gr.vector_source_c(range(fft_len) * 2, False, fft_len)
cp = digital.ofdm_cyclic_prefixer(fft_len, fft_len + cp_len)
sink = gr.vector_sink_c()
self.tb.connect(src, cp, sink)
self.tb.run()
self.assertEqual(sink.data(), expected_result)
def test_wo_tags_2s_rolloff(self):
" No tags, but have a 2-sample rolloff "
fft_len = 8
cp_len = 2
rolloff = 2
expected_result = (7.0/2, 8, 1, 2, 3, 4, 5, 6, 7, 8, # 1.0/2
7.0/2+1.0/2, 8, 1, 2, 3, 4, 5, 6, 7, 8)
src = gr.vector_source_c(range(1, fft_len+1) * 2, False, fft_len)
cp = digital.ofdm_cyclic_prefixer(fft_len, fft_len + cp_len, rolloff)
sink = gr.vector_sink_c()
self.tb.connect(src, cp, sink)
self.tb.run()
self.assertEqual(sink.data(), expected_result)
def test_with_tags_2s_rolloff(self):
" With tags and a 2-sample rolloff "
fft_len = 8
cp_len = 2
tag_name = "length"
expected_result = (7.0/2, 8, 1, 2, 3, 4, 5, 6, 7, 8, # 1.0/2
7.0/2+1.0/2, 8, 1, 2, 3, 4, 5, 6, 7, 8, 1.0/2)
tag = gr.gr_tag_t()
tag.offset = 0
tag.key = pmt.pmt_string_to_symbol(tag_name)
tag.value = pmt.pmt_from_long(2)
tag2 = gr.gr_tag_t()
tag2.offset = 1
tag2.key = pmt.pmt_string_to_symbol("random_tag")
tag2.value = pmt.pmt_from_long(42)
src = gr.vector_source_c(range(1, fft_len+1) * 2, False, fft_len, (tag, tag2))
cp = digital.ofdm_cyclic_prefixer(fft_len, fft_len + cp_len, 2, tag_name)
sink = gr.vector_sink_c()
self.tb.connect(src, cp, sink)
self.tb.run()
self.assertEqual(sink.data(), expected_result)
tags = [gr.tag_to_python(x) for x in sink.tags()]
tags = sorted([(x.offset, x.key, x.value) for x in tags])
expected_tags = [
(0, tag_name, len(expected_result)),
(fft_len+cp_len, "random_tag", 42)
]
self.assertEqual(tags, expected_tags)
if __name__ == '__main__':
gr_unittest.run(test_ofdm_cyclic_prefixer, "test_ofdm_cyclic_prefixer.xml")
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