#!/usr/bin/env python
# Copyright 2012-2014 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, digital, blocks
import pmt
class qa_digital_carrier_allocator_cvc (gr_unittest.TestCase):
def setUp (self):
self.tb = gr.top_block ()
self.tsb_key = "ts_last"
def tearDown (self):
self.tb = None
def test_001_t (self):
"""
pretty simple (the carrier allocation here is not a practical OFDM configuration!)
"""
fft_len = 6
tx_symbols = (1, 2, 3)
# ^ this gets mapped to the DC carrier because occupied_carriers[0][0] == 0
pilot_symbols = ((1j,),)
occupied_carriers = ((0, 1, 2),)
pilot_carriers = ((3,),)
sync_word = (range(fft_len),)
expected_result = tuple(sync_word[0] + [1j, 0, 0, 1, 2, 3])
# ^ DC carrier
src = blocks.vector_source_c(tx_symbols, False, 1)
alloc = digital.ofdm_carrier_allocator_cvc(fft_len,
occupied_carriers,
pilot_carriers,
pilot_symbols, sync_word,
self.tsb_key)
sink = blocks.tsb_vector_sink_c(vlen=fft_len, tsb_key=self.tsb_key)
self.tb.connect(
src,
blocks.stream_to_tagged_stream(gr.sizeof_gr_complex, 1, len(tx_symbols), self.tsb_key),
alloc,
sink
)
self.tb.run()
self.assertEqual(sink.data()[0], expected_result)
def test_001_t2 (self):
"""
pretty simple (same as before, but odd fft len)
"""
fft_len = 5
tx_symbols = (1, 2, 3)
# ^ this gets mapped to the DC carrier because occupied_carriers[0][0] == 0
occupied_carriers = ((0, 1, 2),)
pilot_carriers = ((-2,),)
pilot_symbols = ((1j,),)
expected_result = (1j, 0, 1, 2, 3)
# ^ DC carrier
src = blocks.vector_source_c(tx_symbols, False, 1)
alloc = digital.ofdm_carrier_allocator_cvc(
fft_len,
occupied_carriers,
pilot_carriers,
pilot_symbols, (),
self.tsb_key
)
sink = blocks.tsb_vector_sink_c(vlen=fft_len, tsb_key=self.tsb_key)
self.tb.connect(src, blocks.stream_to_tagged_stream(gr.sizeof_gr_complex, 1, len(tx_symbols), self.tsb_key), alloc, sink)
self.tb.run ()
self.assertEqual(sink.data()[0], expected_result)
def test_002_t (self):
"""
same, but using negative carrier indices
"""
fft_len = 6
tx_symbols = (1, 2, 3)
pilot_symbols = ((1j,),)
occupied_carriers = ((-1, 1, 2),)
pilot_carriers = ((3,),)
expected_result = (1j, 0, 1, 0, 2, 3)
src = blocks.vector_source_c(tx_symbols, False, 1)
alloc = digital.ofdm_carrier_allocator_cvc(fft_len,
occupied_carriers,
pilot_carriers,
pilot_symbols, (),
self.tsb_key)
sink = blocks.tsb_vector_sink_c(fft_len)
self.tb.connect(
src,
blocks.stream_to_tagged_stream(gr.sizeof_gr_complex, 1, len(tx_symbols), self.tsb_key),
alloc,
sink
)
self.tb.run ()
self.assertEqual(sink.data()[0], expected_result)
def test_002_t (self):
"""
once again, but this time add a sync word
"""
fft_len = 6
sync_word = (0,) * fft_len
tx_symbols = (1, 2, 3, 4, 5, 6)
pilot_symbols = ((1j,),)
occupied_carriers = ((-1, 1, 2),)
pilot_carriers = ((3,),)
expected_result = sync_word + (1j, 0, 1, 0, 2, 3) + (1j, 0, 4, 0, 5, 6)
special_tag1 = gr.tag_t()
special_tag1.offset = 0
special_tag1.key = pmt.string_to_symbol("spam")
special_tag1.value = pmt.to_pmt(23)
special_tag2 = gr.tag_t()
special_tag2.offset = 4
special_tag2.key = pmt.string_to_symbol("eggs")
special_tag2.value = pmt.to_pmt(42)
src = blocks.vector_source_c(
tx_symbols, False, 1,
(special_tag1, special_tag2)
)
alloc = digital.ofdm_carrier_allocator_cvc(
fft_len,
occupied_carriers,
pilot_carriers,
pilot_symbols,
sync_words=(sync_word,),
len_tag_key=self.tsb_key
)
sink = blocks.tsb_vector_sink_c(fft_len)
self.tb.connect(src, blocks.stream_to_tagged_stream(gr.sizeof_gr_complex, 1, len(tx_symbols), self.tsb_key), alloc, sink)
self.tb.run ()
self.assertEqual(sink.data()[0], 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])
tags_expected = [
(0, 'spam', 23),
(2, 'eggs', 42),
]
self.assertEqual(tags, tags_expected)
def test_003_t (self):
"""
more advanced:
- 6 symbols per carrier
- 2 pilots per carrier
- have enough data for nearly 3 OFDM symbols
- send that twice
- add some random tags
- don't shift
"""
tx_symbols = range(1, 16); # 15 symbols
pilot_symbols = ((1j, 2j), (3j, 4j))
occupied_carriers = ((1, 3, 4, 11, 12, 14), (1, 2, 4, 11, 13, 14),)
pilot_carriers = ((2, 13), (3, 12))
expected_result = (0, 1, 1j, 2, 3, 0, 0, 0, 0, 0, 0, 4, 5, 2j, 6, 0,
0, 7, 8, 3j, 9, 0, 0, 0, 0, 0, 0, 10, 4j, 11, 12, 0,
0, 13, 1j, 14, 15, 0, 0, 0, 0, 0, 0, 0, 0, 2j, 0, 0)
fft_len = 16
testtag1 = gr.tag_t()
testtag1.offset = 0
testtag1.key = pmt.string_to_symbol('tag1')
testtag1.value = pmt.from_long(0)
testtag2 = gr.tag_t()
testtag2.offset = 7 # On the 2nd OFDM symbol
testtag2.key = pmt.string_to_symbol('tag2')
testtag2.value = pmt.from_long(0)
testtag3 = gr.tag_t()
testtag3.offset = len(tx_symbols)+1 # First OFDM symbol of packet 2
testtag3.key = pmt.string_to_symbol('tag3')
testtag3.value = pmt.from_long(0)
testtag4 = gr.tag_t()
testtag4.offset = 2*len(tx_symbols)-1 # Last OFDM symbol of packet 2
testtag4.key = pmt.string_to_symbol('tag4')
testtag4.value = pmt.from_long(0)
src = blocks.vector_source_c(tx_symbols * 2, False, 1, (testtag1, testtag2, testtag3, testtag4))
alloc = digital.ofdm_carrier_allocator_cvc(fft_len,
occupied_carriers,
pilot_carriers,
pilot_symbols, (),
self.tsb_key,
False)
sink = blocks.tsb_vector_sink_c(fft_len)
self.tb.connect(src, blocks.stream_to_tagged_stream(gr.sizeof_gr_complex, 1, len(tx_symbols), self.tsb_key), alloc, sink)
self.tb.run ()
self.assertEqual(sink.data()[0], expected_result)
tags_found = {'tag1': False, 'tag2': False, 'tag3': False, 'tag4': False}
correct_offsets = {'tag1': 0, 'tag2': 1, 'tag3': 3, 'tag4': 5}
for tag in sink.tags():
key = pmt.symbol_to_string(tag.key)
if key in tags_found.keys():
tags_found[key] = True
self.assertEqual(correct_offsets[key], tag.offset)
self.assertTrue(all(tags_found.values()))
if __name__ == '__main__':
gr_unittest.run(qa_digital_carrier_allocator_cvc, "qa_digital_carrier_allocator_cvc.xml")