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#!/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.
#
import numpy
from gnuradio import gr, gr_unittest, blocks, fft, analog, digital
import pmt
class qa_ofdm_serializer_vcc (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_simple (self):
""" Standard test """
fft_len = 16
tx_symbols = (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)
expected_result = tuple(range(1, 16)) + (0, 0, 0)
occupied_carriers = ((1, 3, 4, 11, 12, 14), (1, 2, 4, 11, 13, 14),)
n_syms = len(tx_symbols)/fft_len
src = blocks.vector_source_c(tx_symbols, False, fft_len)
serializer = digital.ofdm_serializer_vcc(fft_len, occupied_carriers, self.tsb_key, "", 0, "", False)
sink = blocks.tsb_vector_sink_c(tsb_key=self.tsb_key)
self.tb.connect(src, blocks.stream_to_tagged_stream(gr.sizeof_gr_complex, fft_len, n_syms, self.tsb_key), serializer, sink)
self.tb.run ()
self.assertEqual(sink.data()[0], expected_result)
def test_001b_shifted (self):
""" Same as before, but shifted, because that's the normal mode in OFDM Rx """
fft_len = 16
tx_symbols = (
0, 0, 0, 0, 0, 0, 1, 2, 0, 3, 4, 5, 0, 0, 0, 0,
0, 0, 0, 0, 6, 1j, 7, 8, 0, 9, 10, 1j, 11, 0, 0, 0,
0, 0, 0, 0, 0, 12, 13, 14, 0, 15, 16, 17, 0, 0, 0, 0,
)
expected_result = tuple(range(18))
occupied_carriers = ((13, 14, 15, 1, 2, 3), (-4, -2, -1, 1, 2, 4),)
n_syms = len(tx_symbols)/fft_len
src = blocks.vector_source_c(tx_symbols, False, fft_len)
serializer = digital.ofdm_serializer_vcc(fft_len, occupied_carriers, self.tsb_key)
sink = blocks.tsb_vector_sink_c(tsb_key=self.tsb_key)
self.tb.connect(src, blocks.stream_to_tagged_stream(gr.sizeof_gr_complex, fft_len, n_syms, self.tsb_key), serializer, sink)
self.tb.run ()
self.assertEqual(sink.data()[0], expected_result)
def test_002_with_offset (self):
""" Standard test, carrier offset """
fft_len = 16
tx_symbols = range(1, 16);
tx_symbols = (0, 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)
carr_offset = 1 # Compare this with tx_symbols from the previous test
expected_result = tuple(range(1, 16)) + (0, 0, 0)
occupied_carriers = ((1, 3, 4, 11, 12, 14), (1, 2, 4, 11, 13, 14),)
n_syms = len(tx_symbols)/fft_len
offsettag = gr.tag_t()
offsettag.offset = 0
offsettag.key = pmt.string_to_symbol("ofdm_sync_carr_offset")
offsettag.value = pmt.from_long(carr_offset)
src = blocks.vector_source_c(tx_symbols, False, fft_len, (offsettag,))
sink = blocks.tsb_vector_sink_c(tsb_key=self.tsb_key)
serializer = digital.ofdm_serializer_vcc(
fft_len,
occupied_carriers,
self.tsb_key,
"", 0,
"ofdm_sync_carr_offset",
False
)
self.tb.connect(src, blocks.stream_to_tagged_stream(gr.sizeof_gr_complex, fft_len, n_syms, self.tsb_key), serializer, sink)
self.tb.run ()
self.assertEqual(sink.data()[0], expected_result)
self.assertEqual(len(sink.tags()), 1)
def test_003_connect (self):
""" Connect carrier_allocator to ofdm_serializer,
make sure output==input """
fft_len = 8
n_syms = 1
occupied_carriers = ((1, 2, 6, 7),)
pilot_carriers = ((3,),(5,))
pilot_symbols = ((1j,),(-1j,))
#tx_data = tuple([numpy.random.randint(0, 10) for x in range(4 * n_syms)])
tx_data = (1, 2, 3, 4)
src = blocks.vector_source_c(tx_data, False, 1)
alloc = digital.ofdm_carrier_allocator_cvc(
fft_len,
occupied_carriers,
pilot_carriers,
pilot_symbols,
(), # No sync word
self.tsb_key,
True # Output is shifted (default)
)
serializer = digital.ofdm_serializer_vcc(
alloc,
"", # Len tag key
0, # Symbols skipped
"", # Carrier offset key
True # Input is shifted (default)
)
sink = blocks.tsb_vector_sink_c(tsb_key=self.tsb_key)
self.tb.connect(src, blocks.stream_to_tagged_stream(gr.sizeof_gr_complex, 1, len(tx_data), self.tsb_key), alloc, serializer, sink)
self.tb.run ()
self.assertEqual(sink.data()[0], tx_data)
def test_004_connect (self):
"""
Advanced test:
- Allocator -> IFFT -> Frequency offset -> FFT -> Serializer
- FFT does shift (moves DC to middle)
- Make sure input == output
- Frequency offset is -2 carriers
"""
fft_len = 8
n_syms = 1
carr_offset = -2
freq_offset = 1.0 / fft_len * carr_offset # Normalized frequency
occupied_carriers = ((-2, -1, 1, 2),)
pilot_carriers = ((-3,),(3,))
pilot_symbols = ((1j,),(-1j,))
tx_data = (1, 2, 3, 4)
offsettag = gr.tag_t()
offsettag.offset = 0
offsettag.key = pmt.string_to_symbol("ofdm_sync_carr_offset")
offsettag.value = pmt.from_long(carr_offset)
src = blocks.vector_source_c(tx_data, False, 1, (offsettag,))
alloc = digital.ofdm_carrier_allocator_cvc(fft_len,
occupied_carriers,
pilot_carriers,
pilot_symbols, (),
self.tsb_key)
tx_ifft = fft.fft_vcc(fft_len, False, (1.0/fft_len,)*fft_len, True)
oscillator = analog.sig_source_c(1.0, analog.GR_COS_WAVE, freq_offset, 1.0)
mixer = blocks.multiply_cc()
rx_fft = fft.fft_vcc(fft_len, True, (), True)
sink2 = blocks.tsb_vector_sink_c(vlen=fft_len, tsb_key=self.tsb_key)
self.tb.connect(rx_fft, sink2)
serializer = digital.ofdm_serializer_vcc(
alloc, "", 0, "ofdm_sync_carr_offset", True
)
sink = blocks.tsb_vector_sink_c(tsb_key=self.tsb_key)
self.tb.connect(
src,
blocks.stream_to_tagged_stream(gr.sizeof_gr_complex, 1, len(tx_data), self.tsb_key),
alloc, tx_ifft,
blocks.vector_to_stream(gr.sizeof_gr_complex, fft_len),
(mixer, 0),
blocks.stream_to_vector(gr.sizeof_gr_complex, fft_len),
rx_fft, serializer, sink
)
self.tb.connect(oscillator, (mixer, 1))
self.tb.run ()
self.assertComplexTuplesAlmostEqual(sink.data()[0][-len(occupied_carriers[0]):], tx_data, places=4)
def test_005_packet_len_tag (self):
""" Standard test """
fft_len = 16
tx_symbols = range(1, 16);
tx_symbols = (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)
expected_result = tuple(range(1, 16))
occupied_carriers = ((1, 3, 4, 11, 12, 14), (1, 2, 4, 11, 13, 14),)
n_syms = len(tx_symbols)/fft_len
packet_len_tsb_key = "packet_len"
tag2 = gr.tag_t()
tag2.offset = 0
tag2.key = pmt.string_to_symbol("packet_len")
tag2.value = pmt.from_long(len(expected_result))
src = blocks.vector_source_c(tx_symbols, False, fft_len, (tag2,))
serializer = digital.ofdm_serializer_vcc(fft_len, occupied_carriers, self.tsb_key, packet_len_tsb_key , 0, "", False)
sink = blocks.tsb_vector_sink_c(tsb_key=packet_len_tsb_key)
self.tb.connect(src, blocks.stream_to_tagged_stream(gr.sizeof_gr_complex, fft_len, n_syms, self.tsb_key), serializer, sink)
self.tb.run ()
self.assertEqual(sink.data()[0], expected_result)
def test_099 (self):
""" Make sure it fails if it should """
fft_len = 16
occupied_carriers = ((1, 3, 4, 11, 12, 112),) # Something invalid
self.assertRaises(RuntimeError, digital.ofdm_serializer_vcc, fft_len, occupied_carriers, self.tsb_key)
if __name__ == '__main__':
gr_unittest.run(qa_ofdm_serializer_vcc, "qa_ofdm_serializer_vcc.xml")
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