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#!/usr/bin/env python3
#
# Copyright 2007-2018 Free Software Foundation, Inc.
#
# This file is part of GNU Radio
#
# SPDX-License-Identifier: GPL-3.0-or-later
#
#
"""
Unit tests for OFDM cyclic prefixer.
"""
from gnuradio import gr, gr_unittest, digital, blocks
import pmt
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 = blocks.vector_source_c(list(range(fft_len)) * 2, False, fft_len)
cp = digital.ofdm_cyclic_prefixer(fft_len, fft_len + cp_len)
sink = blocks.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 = blocks.vector_source_c(
list(
range(
1,
fft_len +
1)) *
2,
False,
fft_len)
cp = digital.ofdm_cyclic_prefixer(fft_len, fft_len + cp_len, rolloff)
sink = blocks.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 = "ts_last"
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]
tag2 = gr.tag_t()
tag2.offset = 1
tag2.key = pmt.string_to_symbol("random_tag")
tag2.value = pmt.from_long(42)
src = blocks.vector_source_c(
list(range(1, fft_len + 1)) * 2, False, fft_len, (tag2,))
cp = digital.ofdm_cyclic_prefixer(
fft_len, fft_len + cp_len, 2, tag_name)
sink = blocks.tsb_vector_sink_c(tsb_key=tag_name)
self.tb.connect(
src,
blocks.stream_to_tagged_stream(
gr.sizeof_gr_complex,
fft_len,
2,
tag_name),
cp,
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])
expected_tags = [
(fft_len + cp_len, "random_tag", 42)
]
self.assertEqual(tags, expected_tags)
def test_wo_tags_no_rolloff_multiple_cps(self):
"Two CP lengths, no rolloff and no tags."
fft_len = 8
cp_lengths = (3, 2, 2)
expected_result = [5, 6, 7, 0, 1, 2, 3, 4, 5, 6, 7, # 1
6, 7, 0, 1, 2, 3, 4, 5, 6, 7, # 2
6, 7, 0, 1, 2, 3, 4, 5, 6, 7, # 3
5, 6, 7, 0, 1, 2, 3, 4, 5, 6, 7, # 4
6, 7, 0, 1, 2, 3, 4, 5, 6, 7, # 5
]
src = blocks.vector_source_c(list(range(fft_len)) * 5, False, fft_len)
cp = digital.ofdm_cyclic_prefixer(fft_len, cp_lengths)
sink = blocks.vector_sink_c()
self.tb.connect(src, cp, sink)
self.tb.run()
self.assertEqual(sink.data(), expected_result)
def test_wo_tags_2s_rolloff_multiple_cps(self):
"Two CP lengths, 2-sample rolloff and no tags."
fft_len = 8
cp_lengths = (3, 2, 2)
rolloff = 2
expected_result = [6.0 / 2, 7, 8, 1, 2, 3, 4, 5, 6, 7, 8, # 1
7.0 / 2 + 1.0 / 2, 8, 1, 2, 3, 4, 5, 6, 7, 8, # 2
7.0 / 2 + 1.0 / 2, 8, 1, 2, 3, 4, 5, 6, 7, 8, # 3
6.0 / 2 + 1.0 / 2, 7, 8, 1, 2, 3, 4, 5, 6, 7, 8, # 4
7.0 / 2 + 1.0 / 2, 8, 1, 2, 3, 4, 5, 6, 7, 8 # 5
]
src = blocks.vector_source_c(
list(
range(
1,
fft_len +
1)) *
5,
False,
fft_len)
cp = digital.ofdm_cyclic_prefixer(fft_len, cp_lengths, rolloff)
sink = blocks.vector_sink_c()
self.tb.connect(src, cp, sink)
self.tb.run()
self.assertEqual(sink.data(), expected_result)
def test_with_tags_2s_rolloff_multiples_cps(self):
"Two CP lengths, 2-sample rolloff and tags."
fft_len = 8
cp_lengths = (3, 2, 2)
rolloff = 2
tag_name = "ts_last"
expected_result = [
6.0 / 2, 7, 8, 1, 2, 3, 4, 5, 6, 7, 8, # 1
7.0 / 2 + 1.0 / 2, 8, 1, 2, 3, 4, 5, 6, 7, 8, 1.0 / 2 # Last tail
]
# First test tag
tag0 = gr.tag_t()
tag0.offset = 0
tag0.key = pmt.string_to_symbol("first_tag")
tag0.value = pmt.from_long(24)
# Second test tag
tag1 = gr.tag_t()
tag1.offset = 1
tag1.key = pmt.string_to_symbol("second_tag")
tag1.value = pmt.from_long(42)
src = blocks.vector_source_c(
list(range(1, fft_len + 1)) * 2, False, fft_len, (tag0, tag1))
cp = digital.ofdm_cyclic_prefixer(
fft_len, cp_lengths, rolloff, tag_name)
sink = blocks.tsb_vector_sink_c(tsb_key=tag_name)
self.tb.connect(
src,
blocks.stream_to_tagged_stream(
gr.sizeof_gr_complex,
fft_len,
2,
tag_name),
cp,
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])
expected_tags = [
(0, "first_tag", 24),
(fft_len + cp_lengths[0], "second_tag", 42)
]
self.assertEqual(tags, expected_tags)
if __name__ == '__main__':
gr_unittest.run(test_ofdm_cyclic_prefixer)
|
