def __init__(self,
constellation_points=_def_constellation_points,
gray_coded=_def_gray_coded,
*args,
**kwargs):
"""
Hierarchical block for RRC-filtered QPSK modulation.
The input is a byte stream (unsigned char) and the
output is the complex modulated signal at baseband.
See generic_mod block for list of parameters.
"""
constellation_points = _def_constellation_points
constellation = digital_swig.constellation_qpsk()
if constellation_points != 4:
raise ValueError("QPSK can only have 4 constellation points.")
if not gray_coded:
raise ValueError(
"This QPSK mod/demod works only for gray-coded constellations."
)
super(qpsk_mod, self).__init__(constellation=constellation,
gray_coded=gray_coded,
*args,
**kwargs)
def qpsk_constellation(mod_code=_def_mod_code):
"""
Creates a QPSK constellation.
"""
if mod_code != mod_codes.GRAY_CODE:
raise ValueError("This QPSK mod/demod works only for gray-coded constellations.")
return digital.constellation_qpsk()
def test_002_static_wo_tags (self):
fft_len = 8
# 4 5 6 7 0 1 2 3
tx_data = [-1, -1, 1, 2, -1, 3, 0, -1, # 0
-1, -1, 0, 2, -1, 2, 0, -1, # 8
-1, -1, 3, 0, -1, 1, 0, -1, # 16 (Pilot symbols)
-1, -1, 1, 1, -1, 0, 2, -1] # 24
cnst = digital.constellation_qpsk()
tx_signal = [cnst.map_to_points_v(x)[0] if x != -1 else 0 for x in tx_data]
occupied_carriers = ((1, 2, 6, 7),)
pilot_carriers = ((), (), (1, 2, 6, 7), ())
pilot_symbols = (
[], [], [cnst.map_to_points_v(x)[0] for x in (1, 0, 3, 0)], []
)
equalizer = digital.ofdm_equalizer_static(fft_len, occupied_carriers, pilot_carriers, pilot_symbols)
channel = [
0, 0, 1, 1, 0, 1, 1, 0,
0, 0, 1, 1, 0, 1, 1, 0, # These coefficients will be rotated slightly...
0, 0, 1j, 1j, 0, 1j, 1j, 0, # Go crazy here!
0, 0, 1j, 1j, 0, 1j, 1j, 0 # ...and again here.
]
for idx in range(fft_len, 2*fft_len):
channel[idx] = channel[idx-fft_len] * numpy.exp(1j * .1 * numpy.pi * (numpy.random.rand()-.5))
idx2 = idx+2*fft_len
channel[idx2] = channel[idx2] * numpy.exp(1j * 0 * numpy.pi * (numpy.random.rand()-.5))
src = blocks.vector_source_c(numpy.multiply(tx_signal, channel), False, fft_len)
sink = blocks.vector_sink_c(fft_len)
eq = digital.ofdm_frame_equalizer_vcvc(equalizer.base(), 0, "", False, 4)
self.tb.connect(src, eq, sink)
self.tb.run ()
rx_data = [cnst.decision_maker_v((x,)) if x != 0 else -1 for x in sink.data()]
self.assertEqual(tx_data, rx_data)
def qpsk_constellation(mod_code=_def_mod_code):
"""
Creates a QPSK constellation.
"""
if mod_code != mod_codes.GRAY_CODE:
raise ValueError("This QPSK mod/demod works only for gray-coded constellations.")
return digital.constellation_qpsk()
def test_002_static_wo_tags (self):
fft_len = 8
# 4 5 6 7 0 1 2 3
tx_data = [-1, -1, 1, 2, -1, 3, 0, -1, # 0
-1, -1, 0, 2, -1, 2, 0, -1, # 8
-1, -1, 3, 0, -1, 1, 0, -1, # 16 (Pilot symbols)
-1, -1, 1, 1, -1, 0, 2, -1] # 24
cnst = digital.constellation_qpsk()
tx_signal = [cnst.map_to_points_v(x)[0] if x != -1 else 0 for x in tx_data]
occupied_carriers = ((1, 2, 6, 7),)
pilot_carriers = ((), (), (1, 2, 6, 7), ())
pilot_symbols = (
[], [], [cnst.map_to_points_v(x)[0] for x in (1, 0, 3, 0)], []
)
equalizer = digital.ofdm_equalizer_static(fft_len, occupied_carriers, pilot_carriers, pilot_symbols)
channel = [
0, 0, 1, 1, 0, 1, 1, 0,
0, 0, 1, 1, 0, 1, 1, 0, # These coefficients will be rotated slightly...
0, 0, 1j, 1j, 0, 1j, 1j, 0, # Go crazy here!
0, 0, 1j, 1j, 0, 1j, 1j, 0 # ...and again here.
]
for idx in range(fft_len, 2*fft_len):
channel[idx] = channel[idx-fft_len] * numpy.exp(1j * .1 * numpy.pi * (numpy.random.rand()-.5))
idx2 = idx+2*fft_len
channel[idx2] = channel[idx2] * numpy.exp(1j * 0 * numpy.pi * (numpy.random.rand()-.5))
src = gr.vector_source_c(numpy.multiply(tx_signal, channel), False, fft_len)
eq = digital.ofdm_frame_equalizer_vcvc(equalizer.base(), "", False, 4)
sink = gr.vector_sink_c(fft_len)
self.tb.connect(src, eq, sink)
self.tb.run ()
rx_data = [cnst.decision_maker_v((x,)) if x != 0 else -1 for x in sink.data()]
self.assertEqual(tx_data, rx_data)
def _get_constellation(bps):
""" Returns a modulator block for a given number of bits per symbol """
constellation = {1: digital.constellation_bpsk(), 2: digital.constellation_qpsk(), 3: digital.constellation_8psk()}
try:
return constellation[bps]
except KeyError:
print "Modulation not supported."
exit(1)
def test_001_identity(self):
# Constant modulus signal so no adjustments
const = digital_swig.constellation_qpsk()
src_data = const.points() * 1000
N = 100 # settling time
expected_data = src_data[N:]
result = self.transform(src_data, 0.1, const)[N:]
self.assertComplexTuplesAlmostEqual(expected_data, result, 5)
def test_001_identity(self):
# Constant modulus signal so no adjustments
const = digital_swig.constellation_qpsk()
src_data = const.points()*1000
N = 100 # settling time
expected_data = src_data[N:]
result = self.transform(src_data, 0.1, const)[N:]
self.assertComplexTuplesAlmostEqual(expected_data, result, 5)
def _get_constellation(bps):
""" Returns a modulator block for a given number of bits per symbol """
constellation = {
1: digital.constellation_bpsk(),
2: digital.constellation_qpsk(),
3: digital.constellation_8psk()
}
try:
return constellation[bps]
except KeyError:
print 'Modulation not supported.'
exit(1)
def __init__(self, mod_code=_def_mod_code, differential=False, *args, **kwargs):
pre_diff_code = True
if not differential:
constellation = digital.constellation_qpsk()
if mod_code != mod_codes.GRAY_CODE:
raise ValueError("This QPSK mod/demod works only for gray-coded constellations.")
else:
constellation = digital.constellation_dqpsk()
if mod_code not in set([mod_codes.GRAY_CODE, mod_codes.NO_CODE]):
raise ValueError("That mod_code is not supported for DQPSK mod/demod.")
if mod_code == mod_codes.NO_CODE:
pre_diff_code = False
super(qpsk_mod, self).__init__(constellation=constellation, pre_diff_code=pre_diff_code, *args, **kwargs)
def test_002_simpledfe (self):
""" Use the simple DFE equalizer. """
fft_len = 8
# 4 5 6 7 0 1 2 3
tx_data = [-1, -1, 1, 2, -1, 3, 0, -1, # 0
-1, -1, 0, 2, -1, 2, 0, -1, # 8
-1, -1, 3, 0, -1, 1, 0, -1, # 16 (Pilot symbols)
-1, -1, 1, 1, -1, 0, 2, -1] # 24
cnst = digital.constellation_qpsk()
tx_signal = [cnst.map_to_points_v(x)[0] if x != -1 else 0 for x in tx_data]
occupied_carriers = ((1, 2, 6, 7),)
pilot_carriers = ((), (), (1, 2, 6, 7), ())
pilot_symbols = (
[], [], [cnst.map_to_points_v(x)[0] for x in (1, 0, 3, 0)], []
)
equalizer = digital.ofdm_equalizer_simpledfe(
fft_len, cnst.base(), occupied_carriers, pilot_carriers, pilot_symbols, 0, 0.01
)
channel = [
0, 0, 1, 1, 0, 1, 1, 0,
0, 0, 1, 1, 0, 1, 1, 0, # These coefficients will be rotated slightly...
0, 0, 1j, 1j, 0, 1j, 1j, 0, # Go crazy here!
0, 0, 1j, 1j, 0, 1j, 1j, 0 # ...and again here.
]
for idx in range(fft_len, 2*fft_len):
channel[idx] = channel[idx-fft_len] * numpy.exp(1j * .1 * numpy.pi * (numpy.random.rand()-.5))
idx2 = idx+2*fft_len
channel[idx2] = channel[idx2] * numpy.exp(1j * 0 * numpy.pi * (numpy.random.rand()-.5))
len_tag_key = "frame_len"
len_tag = gr.gr_tag_t()
len_tag.offset = 0
len_tag.key = pmt.pmt_string_to_symbol(len_tag_key)
len_tag.value = pmt.pmt_from_long(4)
chan_tag = gr.gr_tag_t()
chan_tag.offset = 0
chan_tag.key = pmt.pmt_string_to_symbol("ofdm_sync_chan_taps")
chan_tag.value = pmt.pmt_init_c32vector(fft_len, channel[:fft_len])
src = gr.vector_source_c(numpy.multiply(tx_signal, channel), False, fft_len, (len_tag, chan_tag))
eq = digital.ofdm_frame_equalizer_vcvc(equalizer.base(), 0, len_tag_key, True)
sink = gr.vector_sink_c(fft_len)
self.tb.connect(src, eq, sink)
self.tb.run ()
rx_data = [cnst.decision_maker_v((x,)) if x != 0 else -1 for x in sink.data()]
self.assertEqual(tx_data, rx_data)
for tag in sink.tags():
if pmt.pmt_symbol_to_string(tag.key) == len_tag_key:
self.assertEqual(pmt.pmt_to_long(tag.value), 4)
if pmt.pmt_symbol_to_string(tag.key) == "ofdm_sync_chan_taps":
self.assertComplexTuplesAlmostEqual(list(pmt.pmt_c32vector_elements(tag.value)), channel[-fft_len:], places=1)
def test_002_simpledfe (self):
""" Use the simple DFE equalizer. """
fft_len = 8
# 4 5 6 7 0 1 2 3
tx_data = [-1, -1, 1, 2, -1, 3, 0, -1, # 0
-1, -1, 0, 2, -1, 2, 0, -1, # 8
-1, -1, 3, 0, -1, 1, 0, -1, # 16 (Pilot symbols)
-1, -1, 1, 1, -1, 0, 2, -1] # 24
cnst = digital.constellation_qpsk()
tx_signal = [cnst.map_to_points_v(x)[0] if x != -1 else 0 for x in tx_data]
occupied_carriers = ((1, 2, 6, 7),)
pilot_carriers = ((), (), (1, 2, 6, 7), ())
pilot_symbols = (
[], [], [cnst.map_to_points_v(x)[0] for x in (1, 0, 3, 0)], []
)
equalizer = digital.ofdm_equalizer_simpledfe(
fft_len, cnst.base(), occupied_carriers, pilot_carriers, pilot_symbols, 0, 0.01
)
channel = [
0, 0, 1, 1, 0, 1, 1, 0,
0, 0, 1, 1, 0, 1, 1, 0, # These coefficients will be rotated slightly...
0, 0, 1j, 1j, 0, 1j, 1j, 0, # Go crazy here!
0, 0, 1j, 1j, 0, 1j, 1j, 0 # ...and again here.
]
for idx in range(fft_len, 2*fft_len):
channel[idx] = channel[idx-fft_len] * numpy.exp(1j * .1 * numpy.pi * (numpy.random.rand()-.5))
idx2 = idx+2*fft_len
channel[idx2] = channel[idx2] * numpy.exp(1j * 0 * numpy.pi * (numpy.random.rand()-.5))
len_tag_key = "frame_len"
len_tag = gr.tag_t()
len_tag.offset = 0
len_tag.key = pmt.string_to_symbol(len_tag_key)
len_tag.value = pmt.from_long(4)
chan_tag = gr.tag_t()
chan_tag.offset = 0
chan_tag.key = pmt.string_to_symbol("ofdm_sync_chan_taps")
chan_tag.value = pmt.init_c32vector(fft_len, channel[:fft_len])
src = blocks.vector_source_c(numpy.multiply(tx_signal, channel), False, fft_len, (len_tag, chan_tag))
eq = digital.ofdm_frame_equalizer_vcvc(equalizer.base(), 0, len_tag_key, True)
sink = blocks.vector_sink_c(fft_len)
self.tb.connect(src, eq, sink)
self.tb.run ()
rx_data = [cnst.decision_maker_v((x,)) if x != 0 else -1 for x in sink.data()]
self.assertEqual(tx_data, rx_data)
for tag in sink.tags():
if pmt.symbol_to_string(tag.key) == len_tag_key:
self.assertEqual(pmt.to_long(tag.value), 4)
if pmt.symbol_to_string(tag.key) == "ofdm_sync_chan_taps":
self.assertComplexTuplesAlmostEqual(list(pmt.c32vector_elements(tag.value)), channel[-fft_len:], places=1)
def __init__(self, mod_code=_def_mod_code, differential=False, *args, **kwargs):
pre_diff_code = True
if not differential:
constellation = digital.constellation_qpsk()
if mod_code != mod_codes.GRAY_CODE:
raise ValueError("This QPSK mod/demod works only for gray-coded constellations.")
else:
constellation = digital.constellation_dqpsk()
if mod_code not in set([mod_codes.GRAY_CODE, mod_codes.NO_CODE]):
raise ValueError("That mod_code is not supported for DQPSK mod/demod.")
if mod_code == mod_codes.NO_CODE:
pre_diff_code = False
super(qpsk_mod, self).__init__(constellation=constellation,
pre_diff_code=pre_diff_code,
*args, **kwargs)
def _test_constellation_decoder_cb_qpsk(self):
cnst = digital.constellation_qpsk()
src_data = (0.5 + 0.5j, 0.1 - 1.2j, -0.8 - 0.1j, -0.45 + 0.8j, 0.8 + 1.0j, -0.5 + 0.1j, 0.1 - 1.2j)
expected_result = (3, 1, 0, 2, 3, 2, 1)
src = blocks.vector_source_c(src_data)
op = digital_swig.constellation_decoder_cb(cnst.base())
dst = blocks.vector_sink_b()
self.tb.connect(src, op)
self.tb.connect(op, dst)
self.tb.run() # run the graph and wait for it to finish
actual_result = dst.data() # fetch the contents of the sink
# print "actual result", actual_result
# print "expected result", expected_result
self.assertFloatTuplesAlmostEqual(expected_result, actual_result)
def test_002_static_wo_tags (self):
""" Same as before, but the input stream has no tag.
We specify the frame size in the constructor.
We also specify a tag key, so the output stream *should* have
a length tag.
"""
fft_len = 8
n_syms = 4
# 4 5 6 7 0 1 2 3
tx_data = [-1, -1, 1, 2, -1, 3, 0, -1, # 0
-1, -1, 0, 2, -1, 2, 0, -1, # 8
-1, -1, 3, 0, -1, 1, 0, -1, # 16 (Pilot symbols)
-1, -1, 1, 1, -1, 0, 2, -1] # 24
cnst = digital.constellation_qpsk()
tx_signal = [cnst.map_to_points_v(x)[0] if x != -1 else 0 for x in tx_data]
occupied_carriers = ((1, 2, 6, 7),)
pilot_carriers = ((), (), (1, 2, 6, 7), ())
pilot_symbols = (
[], [], [cnst.map_to_points_v(x)[0] for x in (1, 0, 3, 0)], []
)
equalizer = digital.ofdm_equalizer_static(fft_len, occupied_carriers, pilot_carriers, pilot_symbols)
channel = [
0, 0, 1, 1, 0, 1, 1, 0,
0, 0, 1, 1, 0, 1, 1, 0, # These coefficients will be rotated slightly (below)...
0, 0, 1j, 1j, 0, 1j, 1j, 0, # Go crazy here!
0, 0, 1j, 1j, 0, 1j, 1j, 0 # ...and again here.
]
for idx in range(fft_len, 2*fft_len):
channel[idx] = channel[idx-fft_len] * numpy.exp(1j * .1 * numpy.pi * (numpy.random.rand()-.5))
idx2 = idx+2*fft_len
channel[idx2] = channel[idx2] * numpy.exp(1j * 0 * numpy.pi * (numpy.random.rand()-.5))
src = gr.vector_source_c(numpy.multiply(tx_signal, channel), False, fft_len)
# We do specify a length tag, it should then appear at the output
eq = digital.ofdm_frame_equalizer_vcvc(equalizer.base(), 0, "frame_len", False, n_syms)
sink = gr.vector_sink_c(fft_len)
self.tb.connect(src, eq, sink)
self.tb.run ()
rx_data = [cnst.decision_maker_v((x,)) if x != 0 else -1 for x in sink.data()]
self.assertEqual(tx_data, rx_data)
# Check len tag
tags = sink.tags()
len_tag = dict()
for tag in tags:
ptag = gr.tag_to_python(tag)
if ptag.key == 'frame_len':
len_tag[ptag.key] = ptag.value
self.assertEqual(len_tag, {'frame_len': 4})
def test_002_static_wo_tags (self):
""" Same as before, but the input stream has no tag.
We specify the frame size in the constructor.
We also specify a tag key, so the output stream *should* have
a length tag.
"""
fft_len = 8
n_syms = 4
# 4 5 6 7 0 1 2 3
tx_data = [-1, -1, 1, 2, -1, 3, 0, -1, # 0
-1, -1, 0, 2, -1, 2, 0, -1, # 8
-1, -1, 3, 0, -1, 1, 0, -1, # 16 (Pilot symbols)
-1, -1, 1, 1, -1, 0, 2, -1] # 24
cnst = digital.constellation_qpsk()
tx_signal = [cnst.map_to_points_v(x)[0] if x != -1 else 0 for x in tx_data]
occupied_carriers = ((1, 2, 6, 7),)
pilot_carriers = ((), (), (1, 2, 6, 7), ())
pilot_symbols = (
[], [], [cnst.map_to_points_v(x)[0] for x in (1, 0, 3, 0)], []
)
equalizer = digital.ofdm_equalizer_static(fft_len, occupied_carriers, pilot_carriers, pilot_symbols)
channel = [
0, 0, 1, 1, 0, 1, 1, 0,
0, 0, 1, 1, 0, 1, 1, 0, # These coefficients will be rotated slightly (below)...
0, 0, 1j, 1j, 0, 1j, 1j, 0, # Go crazy here!
0, 0, 1j, 1j, 0, 1j, 1j, 0 # ...and again here.
]
for idx in range(fft_len, 2*fft_len):
channel[idx] = channel[idx-fft_len] * numpy.exp(1j * .1 * numpy.pi * (numpy.random.rand()-.5))
idx2 = idx+2*fft_len
channel[idx2] = channel[idx2] * numpy.exp(1j * 0 * numpy.pi * (numpy.random.rand()-.5))
src = gr.vector_source_c(numpy.multiply(tx_signal, channel), False, fft_len)
# We do specify a length tag, it should then appear at the output
eq = digital.ofdm_frame_equalizer_vcvc(equalizer.base(), 0, "frame_len", False, n_syms)
sink = blocks.vector_sink_c(fft_len)
self.tb.connect(src, eq, sink)
self.tb.run ()
rx_data = [cnst.decision_maker_v((x,)) if x != 0 else -1 for x in sink.data()]
self.assertEqual(tx_data, rx_data)
# Check len tag
tags = sink.tags()
len_tag = dict()
for tag in tags:
ptag = gr.tag_to_python(tag)
if ptag.key == 'frame_len':
len_tag[ptag.key] = ptag.value
self.assertEqual(len_tag, {'frame_len': 4})
def _test_constellation_decoder_cb_qpsk(self):
cnst = digital.constellation_qpsk()
src_data = (0.5 + 0.5j, 0.1 - 1.2j, -0.8 - 0.1j, -0.45 + 0.8j,
0.8 + 1.0j, -0.5 + 0.1j, 0.1 - 1.2j)
expected_result = (3, 1, 0, 2, 3, 2, 1)
src = blocks.vector_source_c(src_data)
op = digital_swig.constellation_decoder_cb(cnst.base())
dst = blocks.vector_sink_b()
self.tb.connect(src, op)
self.tb.connect(op, dst)
self.tb.run() # run the graph and wait for it to finish
actual_result = dst.data() # fetch the contents of the sink
#print "actual result", actual_result
#print "expected result", expected_result
self.assertFloatTuplesAlmostEqual(expected_result, actual_result)
def __init__(self, constellation_points=_def_constellation_points,
*args, **kwargs):
"""
Hierarchical block for RRC-filtered QPSK modulation.
The input is a byte stream (unsigned char) and the
output is the complex modulated signal at baseband.
See generic_demod block for list of parameters.
"""
constellation_points = _def_constellation_points
constellation = digital_swig.constellation_qpsk()
if constellation_points != 4:
raise ValueError('Number of constellation points must be 4 for QPSK.')
super(qpsk_demod, self).__init__(constellation=constellation,
*args, **kwargs)
def __init__(self,
constellation_points=_def_constellation_points,
*args,
**kwargs):
"""
Hierarchical block for RRC-filtered QPSK modulation.
The input is a byte stream (unsigned char) and the
output is the complex modulated signal at baseband.
See generic_demod block for list of parameters.
"""
constellation_points = _def_constellation_points
constellation = digital_swig.constellation_qpsk()
if constellation_points != 4:
raise ValueError(
'Number of constellation points must be 4 for QPSK.')
super(qpsk_demod, self).__init__(constellation=constellation,
*args,
**kwargs)
def __init__(self, constellation_points=_def_constellation_points,
gray_coded=_def_gray_coded,
*args, **kwargs):
"""
Hierarchical block for RRC-filtered QPSK modulation.
The input is a byte stream (unsigned char) and the
output is the complex modulated signal at baseband.
See generic_mod block for list of parameters.
"""
constellation_points = _def_constellation_points
constellation = digital_swig.constellation_qpsk()
if constellation_points != 4:
raise ValueError("QPSK can only have 4 constellation points.")
if not gray_coded:
raise ValueError("This QPSK mod/demod works only for gray-coded constellations.")
super(qpsk_mod, self).__init__(constellation=constellation,
gray_coded=gray_coded,
*args, **kwargs)
def test_002_static(self):
"""
- Add a simple channel
- Make symbols QPSK
"""
fft_len = 8
# 4 5 6 7 0 1 2 3
tx_data = [
-1,
-1,
1,
2,
-1,
3,
0,
-1, # 0
-1,
-1,
0,
2,
-1,
2,
0,
-1, # 8
-1,
-1,
3,
0,
-1,
1,
0,
-1, # 16 (Pilot symbols)
-1,
-1,
1,
1,
-1,
0,
2,
-1
] # 24
cnst = digital.constellation_qpsk()
tx_signal = [
cnst.map_to_points_v(x)[0] if x != -1 else 0 for x in tx_data
]
occupied_carriers = ((1, 2, 6, 7), )
pilot_carriers = ((), (), (1, 2, 6, 7), ())
pilot_symbols = ([], [],
[cnst.map_to_points_v(x)[0]
for x in (1, 0, 3, 0)], [])
equalizer = digital.ofdm_equalizer_static(fft_len, occupied_carriers,
pilot_carriers,
pilot_symbols)
channel = [
0,
0,
1,
1,
0,
1,
1,
0,
0,
0,
1,
1,
0,
1,
1,
0, # These coefficients will be rotated slightly (but less than \pi/2)
0,
0,
1j,
1j,
0,
1j,
1j,
0, # Go crazy here!
0,
0,
1j,
1j,
0,
1j,
1j,
0
]
channel = [
0,
0,
1,
1,
0,
1,
1,
0,
0,
0,
1,
1,
0,
1,
1,
0, # These coefficients will be rotated slightly (but less than \pi/2)
0,
0,
1j,
1j,
0,
1j,
1j,
0, # Go crazy here!
0,
0,
1j,
1j,
0,
1j,
1j,
0
]
for idx in range(fft_len, 2 * fft_len):
channel[idx] = channel[idx - fft_len] * numpy.exp(
1j * .1 * numpy.pi * (numpy.random.rand() - .5))
len_tag_key = "frame_len"
len_tag = gr.gr_tag_t()
len_tag.offset = 0
len_tag.key = pmt.pmt_string_to_symbol(len_tag_key)
len_tag.value = pmt.pmt_from_long(4)
chan_tag = gr.gr_tag_t()
chan_tag.offset = 0
chan_tag.key = pmt.pmt_string_to_symbol("ofdm_sync_chan_taps")
chan_tag.value = pmt.pmt_init_c32vector(fft_len, channel[:fft_len])
src = gr.vector_source_c(numpy.multiply(tx_signal, channel), False,
fft_len, (len_tag, chan_tag))
eq = digital.ofdm_frame_equalizer_vcvc(equalizer.base(), 0,
len_tag_key, True)
sink = gr.vector_sink_c(fft_len)
self.tb.connect(src, eq, sink)
self.tb.run()
rx_data = [
cnst.decision_maker_v((x, )) if x != 0 else -1
for x in sink.data()
]
# Check data
self.assertEqual(tx_data, rx_data)
# Check tags
tag_dict = dict()
for tag in sink.tags():
ptag = gr.tag_to_python(tag)
tag_dict[ptag.key] = ptag.value
if ptag.key == 'ofdm_sync_chan_taps':
tag_dict[ptag.key] = list(pmt.pmt_c32vector_elements(
tag.value))
else:
tag_dict[ptag.key] = pmt.to_python(tag.value)
expected_dict = {
'frame_len': 4,
'ofdm_sync_chan_taps': channel[-fft_len:]
}
self.assertEqual(tag_dict, expected_dict)
def test_002_static (self):
"""
- Add a simple channel
- Make symbols QPSK
"""
fft_len = 8
# 4 5 6 7 0 1 2 3
tx_data = [-1, -1, 1, 2, -1, 3, 0, -1, # 0
-1, -1, 0, 2, -1, 2, 0, -1, # 8
-1, -1, 3, 0, -1, 1, 0, -1, # 16 (Pilot symbols)
-1, -1, 1, 1, -1, 0, 2, -1] # 24
cnst = digital.constellation_qpsk()
tx_signal = [cnst.map_to_points_v(x)[0] if x != -1 else 0 for x in tx_data]
occupied_carriers = ((1, 2, 6, 7),)
pilot_carriers = ((), (), (1, 2, 6, 7), ())
pilot_symbols = (
[], [], [cnst.map_to_points_v(x)[0] for x in (1, 0, 3, 0)], []
)
equalizer = digital.ofdm_equalizer_static(fft_len, occupied_carriers, pilot_carriers, pilot_symbols)
channel = [
0, 0, 1, 1, 0, 1, 1, 0,
0, 0, 1, 1, 0, 1, 1, 0, # These coefficients will be rotated slightly (but less than \pi/2)
0, 0, 1j, 1j, 0, 1j, 1j, 0, # Go crazy here!
0, 0, 1j, 1j, 0, 1j, 1j, 0
]
channel = [
0, 0, 1, 1, 0, 1, 1, 0,
0, 0, 1, 1, 0, 1, 1, 0, # These coefficients will be rotated slightly (but less than \pi/2)
0, 0, 1j, 1j, 0, 1j, 1j, 0, # Go crazy here!
0, 0, 1j, 1j, 0, 1j, 1j, 0
]
for idx in range(fft_len, 2*fft_len):
channel[idx] = channel[idx-fft_len] * numpy.exp(1j * .1 * numpy.pi * (numpy.random.rand()-.5))
len_tag_key = "frame_len"
len_tag = gr.gr_tag_t()
len_tag.offset = 0
len_tag.key = pmt.pmt_string_to_symbol(len_tag_key)
len_tag.value = pmt.pmt_from_long(4)
chan_tag = gr.gr_tag_t()
chan_tag.offset = 0
chan_tag.key = pmt.pmt_string_to_symbol("ofdm_sync_chan_taps")
chan_tag.value = pmt.pmt_init_c32vector(fft_len, channel[:fft_len])
src = gr.vector_source_c(numpy.multiply(tx_signal, channel), False, fft_len, (len_tag, chan_tag))
eq = digital.ofdm_frame_equalizer_vcvc(equalizer.base(), 0, len_tag_key, True)
sink = gr.vector_sink_c(fft_len)
self.tb.connect(src, eq, sink)
self.tb.run ()
rx_data = [cnst.decision_maker_v((x,)) if x != 0 else -1 for x in sink.data()]
# Check data
self.assertEqual(tx_data, rx_data)
# Check tags
tag_dict = dict()
for tag in sink.tags():
ptag = gr.tag_to_python(tag)
tag_dict[ptag.key] = ptag.value
if ptag.key == 'ofdm_sync_chan_taps':
tag_dict[ptag.key] = list(pmt.pmt_c32vector_elements(tag.value))
else:
tag_dict[ptag.key] = pmt.to_python(tag.value)
expected_dict = {
'frame_len': 4,
'ofdm_sync_chan_taps': channel[-fft_len:]
}
self.assertEqual(tag_dict, expected_dict)
import os
from gnuradio import gr, gr_unittest
import trellis_swig as trellis
import digital_swig as digital
import analog_swig as analog
import blocks_swig as blocks
fsm_args = {
"awgn1o2_4": (2, 4, 4, (0, 2, 0, 2, 1, 3, 1, 3), (0, 3, 3, 0, 1, 2, 2, 1)),
"rep2": (2, 1, 4, (0, 0), (0, 3)),
"nothing": (2, 1, 2, (0, 0), (0, 1)),
}
constells = {2: digital.constellation_bpsk(), 4: digital.constellation_qpsk()}
class test_trellis(gr_unittest.TestCase):
def test_001_fsm(self):
f = trellis.fsm(*fsm_args["awgn1o2_4"])
self.assertEqual(fsm_args["awgn1o2_4"], (f.I(), f.S(), f.O(), f.NS(), f.OS()))
def test_002_fsm(self):
f = trellis.fsm(*fsm_args["awgn1o2_4"])
g = trellis.fsm(f)
self.assertEqual((g.I(), g.S(), g.O(), g.NS(), g.OS()), (f.I(), f.S(), f.O(), f.NS(), f.OS()))
def test_003_fsm(self):
# FIXME: no file "awgn1o2_4.fsm"
# f = trellis.fsm("awgn1o2_4.fsm")
def qpsk_constellation(m=_def_constellation_points):
if m != _def_constellation_points:
raise ValueError("QPSK can only have 4 constellation points.")
return digital_swig.constellation_qpsk()
# but because it runs on the non-installed python code it's all a mess.
import trellis
import os
import digital_swig
fsm_args = {"awgn1o2_4": (2, 4, 4,
(0, 2, 0, 2, 1, 3, 1, 3),
(0, 3, 3, 0, 1, 2, 2, 1),
),
"rep2": (2, 1, 4, (0, 0), (0, 3)),
"nothing": (2, 1, 2, (0, 0), (0, 1)),
}
constells = {2: digital_swig.constellation_bpsk(),
4: digital_swig.constellation_qpsk(),
}
class test_trellis (gr_unittest.TestCase):
def test_001_fsm (self):
f = trellis.fsm(*fsm_args["awgn1o2_4"])
self.assertEqual(fsm_args["awgn1o2_4"],(f.I(),f.S(),f.O(),f.NS(),f.OS()))
def test_002_fsm (self):
f = trellis.fsm(*fsm_args["awgn1o2_4"])
g = trellis.fsm(f)
self.assertEqual((g.I(),g.S(),g.O(),g.NS(),g.OS()),(f.I(),f.S(),f.O(),f.NS(),f.OS()))
def test_003_fsm (self):
# FIXME: no file "awgn1o2_4.fsm"
def qpsk_constellation(m=_def_constellation_points):
if m != _def_constellation_points:
raise ValueError("QPSK can only have 4 constellation points.")
return digital_swig.constellation_qpsk()
fsm_args = {
"awgn1o2_4": (
2,
4,
4,
(0, 2, 0, 2, 1, 3, 1, 3),
(0, 3, 3, 0, 1, 2, 2, 1),
),
"rep2": (2, 1, 4, (0, 0), (0, 3)),
"nothing": (2, 1, 2, (0, 0), (0, 1)),
}
constells = {
2: digital_swig.constellation_bpsk(),
4: digital_swig.constellation_qpsk(),
}
class test_trellis(gr_unittest.TestCase):
def test_001_fsm(self):
f = trellis.fsm(*fsm_args["awgn1o2_4"])
self.assertEqual(fsm_args["awgn1o2_4"],
(f.I(), f.S(), f.O(), f.NS(), f.OS()))
def test_002_fsm(self):
f = trellis.fsm(*fsm_args["awgn1o2_4"])
g = trellis.fsm(f)
self.assertEqual((g.I(), g.S(), g.O(), g.NS(), g.OS()),
(f.I(), f.S(), f.O(), f.NS(), f.OS()))
fsm_args = {
"awgn1o2_4": (
2,
4,
4,
(0, 2, 0, 2, 1, 3, 1, 3),
(0, 3, 3, 0, 1, 2, 2, 1),
),
"rep2": (2, 1, 4, (0, 0), (0, 3)),
"nothing": (2, 1, 2, (0, 0), (0, 1)),
}
constells = {
2: digital.constellation_bpsk(),
4: digital.constellation_qpsk(),
}
class test_trellis(gr_unittest.TestCase):
def test_001_fsm(self):
f = trellis.fsm(*fsm_args["awgn1o2_4"])
self.assertEqual(fsm_args["awgn1o2_4"],
(f.I(), f.S(), f.O(), f.NS(), f.OS()))
def test_002_fsm(self):
f = trellis.fsm(*fsm_args["awgn1o2_4"])
g = trellis.fsm(f)
self.assertEqual((g.I(), g.S(), g.O(), g.NS(), g.OS()),
(f.I(), f.S(), f.O(), f.NS(), f.OS()))