def test_001_qpsk_mapper_vbc(self): src_data = [10,128] expected_result = [1+1j,1+1j,-1+1j,-1+1j,-1+1j,1+1j,1+1j,1+1j] expected_result = [x/math.sqrt(2) for x in expected_result] src = blocks.vector_source_b(src_data) s2v = blocks.stream_to_vector(gr.sizeof_char, 1) qpsk_mapper_vbc = dab.qpsk_mapper_vbc(4) v2s = blocks.vector_to_stream(gr.sizeof_gr_complex, 4) dst = blocks.vector_sink_c() self.tb.connect(src, s2v, qpsk_mapper_vbc, v2s, dst) self.tb.run() result_data = dst.data() # print expected_result # print result_data self.assertComplexTuplesAlmostEqual(expected_result, result_data, 6)
def test_001_qpsk_mapper_vbc(self):
src_data = [10, 128]
expected_result = [
1 + 1j, 1 + 1j, -1 + 1j, -1 + 1j, -1 + 1j, 1 + 1j, 1 + 1j, 1 + 1j
]
expected_result = [x / math.sqrt(2) for x in expected_result]
src = blocks.vector_source_b(src_data)
s2v = blocks.stream_to_vector(gr.sizeof_char, 1)
qpsk_mapper_vbc = dab.qpsk_mapper_vbc(4)
v2s = blocks.vector_to_stream(gr.sizeof_gr_complex, 4)
dst = blocks.vector_sink_c()
self.tb.connect(src, s2v, qpsk_mapper_vbc, v2s, dst)
self.tb.run()
result_data = dst.data()
# print expected_result
# print result_data
self.assertComplexTuplesAlmostEqual(expected_result, result_data, 6)
def __init__(self, dab_params, verbose=False, debug=False): """ Hierarchical block for OFDM modulation @param dab_params DAB parameter object (dab.parameters.dab_parameters) @param debug enables debug output to files """ dp = dab_params gr.hier_block2.__init__(self,"ofdm_mod", gr.io_signature2(2, 2, gr.sizeof_char*dp.num_carriers/4, gr.sizeof_char), # input signature gr.io_signature (1, 1, gr.sizeof_gr_complex)) # output signature # symbol mapping self.mapper = dab.qpsk_mapper_vbc(dp.num_carriers) # add pilot symbol self.insert_pilot = dab.ofdm_insert_pilot_vcc(dp.prn) # phase sum self.sum_phase = dab.sum_phasor_trig_vcc(dp.num_carriers) # frequency interleaving self.interleave = dab.frequency_interleaver_vcc(dp.frequency_interleaving_sequence_array) # add central carrier & move to middle self.move_and_insert_carrier = dab.ofdm_move_and_insert_zero(dp.fft_length, dp.num_carriers) # ifft self.ifft = fft.fft_vcc(dp.fft_length, False, [], True) # cyclic prefixer self.prefixer = digital.ofdm_cyclic_prefixer(dp.fft_length, dp.symbol_length) # convert back to vectors self.s2v = blocks.stream_to_vector(gr.sizeof_gr_complex, dp.symbol_length) # add null symbol self.insert_null = dab.insert_null_symbol(dp.ns_length, dp.symbol_length) # # connect it all # # data self.connect((self,0), self.mapper, (self.insert_pilot,0), (self.sum_phase,0), self.interleave, self.move_and_insert_carrier, self.ifft, self.prefixer, self.s2v, (self.insert_null,0)) self.connect(self.insert_null, self) # control signal (frame start) self.connect((self,1), (self.insert_pilot,1), (self.sum_phase,1), (self.insert_null,1)) if debug: self.connect(self.mapper, blocks.file_sink(gr.sizeof_gr_complex*dp.num_carriers, "debug/generated_signal_mapper.dat")) self.connect(self.insert_pilot, blocks.file_sink(gr.sizeof_gr_complex*dp.num_carriers, "debug/generated_signal_insert_pilot.dat")) self.connect(self.sum_phase, blocks.file_sink(gr.sizeof_gr_complex*dp.num_carriers, "debug/generated_signal_sum_phase.dat")) self.connect(self.interleave, blocks.file_sink(gr.sizeof_gr_complex*dp.num_carriers, "debug/generated_signal_interleave.dat")) self.connect(self.move_and_insert_carrier, blocks.file_sink(gr.sizeof_gr_complex*dp.fft_length, "debug/generated_signal_move_and_insert_carrier.dat")) self.connect(self.ifft, blocks.file_sink(gr.sizeof_gr_complex*dp.fft_length, "debug/generated_signal_ifft.dat")) self.connect(self.prefixer, blocks.file_sink(gr.sizeof_gr_complex, "debug/generated_signal_prefixer.dat")) self.connect(self.insert_null, blocks.file_sink(gr.sizeof_gr_complex, "debug/generated_signal.dat"))
def __init__(self, dab_params, verbose=False, debug=False):
"""
Hierarchical block for OFDM modulation
@param dab_params DAB parameter object (dab.parameters.dab_parameters)
@param debug enables debug output to files
"""
dp = dab_params
gr.hier_block2.__init__(
self,
"ofdm_mod",
gr.io_signature2(2, 2, gr.sizeof_char * dp.num_carriers / 4,
gr.sizeof_char), # input signature
gr.io_signature(1, 1, gr.sizeof_gr_complex)) # output signature
# symbol mapping
self.mapper = dab.qpsk_mapper_vbc(dp.num_carriers)
# add pilot symbol
self.insert_pilot = dab.ofdm_insert_pilot_vcc(dp.prn)
# phase sum
self.sum_phase = dab.sum_phasor_trig_vcc(dp.num_carriers)
# frequency interleaving
self.interleave = dab.frequency_interleaver_vcc(
dp.frequency_interleaving_sequence_array)
# add central carrier & move to middle
self.move_and_insert_carrier = dab.ofdm_move_and_insert_zero(
dp.fft_length, dp.num_carriers)
# ifft
self.ifft = fft.fft_vcc(dp.fft_length, False, [], True)
# cyclic prefixer
self.prefixer = digital.ofdm_cyclic_prefixer(dp.fft_length,
dp.symbol_length)
# convert back to vectors
self.s2v = blocks.stream_to_vector(gr.sizeof_gr_complex,
dp.symbol_length)
# add null symbol
self.insert_null = dab.insert_null_symbol(dp.ns_length,
dp.symbol_length)
#
# connect it all
#
# data
self.connect((self, 0), self.mapper, (self.insert_pilot, 0),
(self.sum_phase, 0), self.interleave,
self.move_and_insert_carrier, self.ifft, self.prefixer,
self.s2v, (self.insert_null, 0))
self.connect(self.insert_null, self)
# control signal (frame start)
self.connect((self, 1), (self.insert_pilot, 1), (self.sum_phase, 1),
(self.insert_null, 1))
if debug:
self.connect(
self.mapper,
blocks.file_sink(gr.sizeof_gr_complex * dp.num_carriers,
"debug/generated_signal_mapper.dat"))
self.connect(
self.insert_pilot,
blocks.file_sink(gr.sizeof_gr_complex * dp.num_carriers,
"debug/generated_signal_insert_pilot.dat"))
self.connect(
self.sum_phase,
blocks.file_sink(gr.sizeof_gr_complex * dp.num_carriers,
"debug/generated_signal_sum_phase.dat"))
self.connect(
self.interleave,
blocks.file_sink(gr.sizeof_gr_complex * dp.num_carriers,
"debug/generated_signal_interleave.dat"))
self.connect(
self.move_and_insert_carrier,
blocks.file_sink(
gr.sizeof_gr_complex * dp.fft_length,
"debug/generated_signal_move_and_insert_carrier.dat"))
self.connect(
self.ifft,
blocks.file_sink(gr.sizeof_gr_complex * dp.fft_length,
"debug/generated_signal_ifft.dat"))
self.connect(
self.prefixer,
blocks.file_sink(gr.sizeof_gr_complex,
"debug/generated_signal_prefixer.dat"))
self.connect(
self.insert_null,
blocks.file_sink(gr.sizeof_gr_complex,
"debug/generated_signal.dat"))