def helper(self, v0, v1, fft_length, preamble):
tb = self.tb
src0 = gr.vector_source_c(v0)
src1 = gr.vector_source_b(v1)
s2v = gr.stream_to_vector(gr.sizeof_gr_complex, fft_length)
# print "len(v) = %d" % (len(v))
op = digital_swig.ofdm_insert_preamble(fft_length, preamble)
v2s = gr.vector_to_stream(gr.sizeof_gr_complex, fft_length)
dst0 = gr.vector_sink_c()
dst1 = gr.vector_sink_b()
tb.connect(src0, s2v, (op, 0))
tb.connect(src1, (op, 1))
tb.connect((op, 0), v2s, dst0)
tb.connect((op, 1), dst1)
tb.run()
r0 = dst0.data()
r0v = []
for i in range(len(r0)//fft_length):
r0v.append(r0[i*fft_length:(i+1)*fft_length])
r1 = dst1.data()
self.assertEqual(len(r0v), len(r1))
return (r1, r0v)
def __init__(self, options, msgq_limit=2, pad_for_usrp=True):
"""
Hierarchical block for sending packets
Packets to be sent are enqueued by calling send_pkt.
The output is the complex modulated signal at baseband.
@param options: pass modulation options from higher layers (fft length, occupied tones, etc.)
@param msgq_limit: maximum number of messages in message queue
@type msgq_limit: int
@param pad_for_usrp: If true, packets are padded such that they end up a multiple of 128 samples
"""
gr.hier_block2.__init__(self, "ofdm_mod",
gr.io_signature(0, 0, 0), # Input signature
gr.io_signature(1, 1, gr.sizeof_gr_complex)) # Output signature
self._pad_for_usrp = pad_for_usrp
self._modulation = options.modulation
self._fft_length = options.fft_length
self._occupied_tones = options.occupied_tones
self._cp_length = options.cp_length
win = [] #[1 for i in range(self._fft_length)]
# Use freq domain to get doubled-up known symbol for correlation in time domain
zeros_on_left = int(math.ceil((self._fft_length - self._occupied_tones)/2.0))
ksfreq = known_symbols_4512_3[0:self._occupied_tones]
for i in range(len(ksfreq)):
if((zeros_on_left + i) & 1):
ksfreq[i] = 0
# hard-coded known symbols
preambles = (ksfreq,)
padded_preambles = list()
for pre in preambles:
padded = self._fft_length*[0,]
padded[zeros_on_left : zeros_on_left + self._occupied_tones] = pre
padded_preambles.append(padded)
symbol_length = options.fft_length + options.cp_length
mods = {"bpsk": 2, "qpsk": 4, "8psk": 8, "qam8": 8, "qam16": 16, "qam64": 64, "qam256": 256}
arity = mods[self._modulation]
rot = 1
if self._modulation == "qpsk":
rot = (0.707+0.707j)
# FIXME: pass the constellation objects instead of just the points
if(self._modulation.find("psk") >= 0):
constel = psk.psk_constellation(arity)
rotated_const = map(lambda pt: pt * rot, constel.points())
elif(self._modulation.find("qam") >= 0):
constel = qam.qam_constellation(arity)
rotated_const = map(lambda pt: pt * rot, constel.points())
#print rotated_const
self._pkt_input = digital_swig.ofdm_mapper_bcv(rotated_const,
msgq_limit,
options.occupied_tones,
options.fft_length)
self.preambles = digital_swig.ofdm_insert_preamble(self._fft_length,
padded_preambles)
self.ifft = gr.fft_vcc(self._fft_length, False, win, True)
self.cp_adder = digital_swig.ofdm_cyclic_prefixer(self._fft_length,
symbol_length)
self.scale = gr.multiply_const_cc(1.0 / math.sqrt(self._fft_length))
self.connect((self._pkt_input, 0), (self.preambles, 0))
self.connect((self._pkt_input, 1), (self.preambles, 1))
self.connect(self.preambles, self.ifft, self.cp_adder, self.scale, self)
if options.verbose:
self._print_verbage()
if options.log:
self.connect(self._pkt_input, gr.file_sink(gr.sizeof_gr_complex*options.fft_length,
"ofdm_mapper_c.dat"))
self.connect(self.preambles, gr.file_sink(gr.sizeof_gr_complex*options.fft_length,
"ofdm_preambles.dat"))
self.connect(self.ifft, gr.file_sink(gr.sizeof_gr_complex*options.fft_length,
"ofdm_ifft_c.dat"))
self.connect(self.cp_adder, gr.file_sink(gr.sizeof_gr_complex,
"ofdm_cp_adder_c.dat"))
def __init__(self, options, msgq_limit=2, pad_for_usrp=True):
"""
Hierarchical block for sending packets
Packets to be sent are enqueued by calling send_pkt.
The output is the complex modulated signal at baseband.
@param options: pass modulation options from higher layers (fft length, occupied tones, etc.)
@param msgq_limit: maximum number of messages in message queue
@type msgq_limit: int
@param pad_for_usrp: If true, packets are padded such that they end up a multiple of 128 samples
"""
gr.hier_block2.__init__(self, "ofdm_mod",
gr.io_signature(0, 0, 0), # Input signature
gr.io_signature(1, 1, gr.sizeof_gr_complex)) # Output signature
self._pad_for_usrp = pad_for_usrp
self._modulation = options.modulation
self._fft_length = options.fft_length
self._occupied_tones = options.occupied_tones
self._cp_length = options.cp_length
win = [] #[1 for i in range(self._fft_length)]
# Use freq domain to get doubled-up known symbol for correlation in time domain
zeros_on_left = int(math.ceil((self._fft_length - self._occupied_tones)/2.0))
# ksfreq = known_symbols_4512_3[0:self._occupied_tones]
# This fixed the bug, when the occupied tones are greater that the known symbols
ksfreq = [0] * self._occupied_tones
known_symbols_len = len(known_symbols_4512_3)
for i in range(self._occupied_tones):
ksfreq[i] = known_symbols_4512_3[i % known_symbols_len]
for i in range(len(ksfreq)):
if((zeros_on_left + i) & 1):
ksfreq[i] = 0
# hard-coded known symbols
preambles = (ksfreq,)
padded_preambles = list()
for pre in preambles:
padded = self._fft_length*[0,]
padded[zeros_on_left : zeros_on_left + self._occupied_tones] = pre
padded_preambles.append(padded)
symbol_length = options.fft_length + options.cp_length
mods = {"qpsk": 4, "qam16": 16, "qam64": 64}
arity = mods[self._modulation]
rot = 1
#Create constellation objects for payload data.
if(self._modulation.find("qpsk") >= 0):
constel = dvbt_constellations.dvbt_qpsk_constellation(arity)
elif(self._modulation.find("qam16") >= 0):
constel = dvbt_constellations.dvbt_16qam_constellation(arity,False,mod_codes.GRAY_CODE)
elif(self._modulation.find("qam64") >= 0):
constel = dvbt_constellations.dvbt_64qam_constellation(arity,False,mod_codes.GRAY_CODE)
rotated_const = constel.points()
print rotated_const
#Create constellation objects for pilot signals
cs_constel = dvbt_constellations.dvbt_cs_pilots()
tps_constel = dvbt_constellations.dvbt_tps_pilots()
#print cs_constel.points()
#print "\n"
#print tps_constel.points()
self._pkt_input = digital_swig.dvbt_ofdm_mapper_bcv(rotated_const,tps_constel.points(),
cs_constel.points(),
msgq_limit,
options.occupied_tones,
options.fft_length)
self.preambles = digital_swig.ofdm_insert_preamble(self._fft_length,
padded_preambles)
self.ifft = gr.fft_vcc(self._fft_length, False, win, True)
self.cp_adder = digital_swig.ofdm_cyclic_prefixer(self._fft_length,
symbol_length)
self.scale = gr.multiply_const_cc(1.0 / math.sqrt(self._fft_length))
self.connect((self._pkt_input, 0), (self.preambles, 0))
self.connect((self._pkt_input, 1), (self.preambles, 1))
self.connect(self.preambles, self.ifft, self.cp_adder, self.scale, self)
if options.verbose:
self._print_verbage()
if options.log:
self.connect(self._pkt_input, gr.file_sink(gr.sizeof_gr_complex*options.fft_length,
"ofdm_mapper_c.dat"))
self.connect(self.preambles, gr.file_sink(gr.sizeof_gr_complex*options.fft_length,
"ofdm_preambles.dat"))
self.connect(self.ifft, gr.file_sink(gr.sizeof_gr_complex*options.fft_length,
"ofdm_ifft_c.dat"))
self.connect(self.cp_adder, gr.file_sink(gr.sizeof_gr_complex,
"ofdm_cp_adder_c.dat"))
def __init__(self, options, msgq_limit=2, pad_for_usrp=True):
"""
Hierarchical block for sending packets
Packets to be sent are enqueued by calling send_pkt.
The output is the complex modulated signal at baseband.
@param options: pass modulation options from higher layers (fft length, occupied tones, etc.)
@param msgq_limit: maximum number of messages in message queue
@type msgq_limit: int
@param pad_for_usrp: If true, packets are padded such that they end up a multiple of 128 samples
"""
gr.hier_block2.__init__(self, "ofdm_mod",
gr.io_signature(0, 0, 0), # Input signature
gr.io_signature(1, 1, gr.sizeof_gr_complex)) # Output signature
self._pad_for_usrp = pad_for_usrp
self._modulation = options.modulation
self._fft_length = options.fft_length
self._occupied_tones = options.occupied_tones
self._cp_length = options.cp_length
win = [] #[1 for i in range(self._fft_length)]
# Use freq domain to get doubled-up known symbol for correlation in time domain
zeros_on_left = int(math.ceil((self._fft_length - self._occupied_tones)/2.0))
ksfreq = known_symbols_4512_3[0:self._occupied_tones]
for i in range(len(ksfreq)):
if((zeros_on_left + i) & 1):
ksfreq[i] = 0
# hard-coded known symbols
preambles = (ksfreq,)
# print preambles
padded_preambles = list()
for pre in preambles:
padded = self._fft_length*[0,]
padded[zeros_on_left : zeros_on_left + self._occupied_tones] = pre
padded_preambles.append(padded)
# print
# print padded_preambles
symbol_length = options.fft_length + options.cp_length
mods = {"bpsk": 2, "qpsk": 4, "8psk": 8, "qam8": 8, "qam16": 16, "qam64": 64, "qam256": 256}
arity = mods[self._modulation]
rot = 1
if self._modulation == "qpsk":
rot = (0.707+0.707j)
# FIXME: pass the constellation objects instead of just the points
if(self._modulation.find("psk") >= 0):
constel = psk.psk_constellation(arity)
rotated_const = map(lambda pt: pt * rot, constel.points())
elif(self._modulation.find("qam") >= 0):
constel = qam.qam_constellation(arity)
rotated_const = map(lambda pt: pt * rot, constel.points())
#print rotated_const
self._pkt_input = digital_swig.ofdm_mapper_bcv(rotated_const,
msgq_limit,
options.occupied_tones,
options.fft_length)
self.preambles = digital_swig.ofdm_insert_preamble(self._fft_length,
padded_preambles)
self.ifft = gr.fft_vcc(self._fft_length, False, win, True)
self.cp_adder = digital_swig.ofdm_cyclic_prefixer(self._fft_length,
symbol_length)
self.scale = gr.multiply_const_cc(1.0 / math.sqrt(self._fft_length))
self.v2s = gr.vector_to_stream(gr.sizeof_gr_complex, self._fft_length+self._cp_length)
self.connect((self._pkt_input, 0), (self.preambles, 0))
self.connect((self._pkt_input, 1), (self.preambles, 1))
self.connect((self._pkt_input, 2), (self.preambles, 2))
self.connect(self.preambles, self.ifft, self.cp_adder)
self.connect((self.preambles, 1), gr.null_sink(gr.sizeof_char))
self.connect((self.preambles, 2), (self.cp_adder, 1))
self.connect(self.cp_adder, self.scale, self)
if options.verbose:
self._print_verbage()
if options.log:
self.connect(self._pkt_input, gr.file_sink(gr.sizeof_gr_complex*options.fft_length,
"ofdm_mapper_c.dat"))
self.connect(self.preambles, gr.file_sink(gr.sizeof_gr_complex*options.fft_length,
"ofdm_preambles.dat"))
self.connect((self.preambles, 2), gr.file_sink(gr.sizeof_char, "ofdm_preambles_debug.dat"))
self.connect(self.ifft, gr.file_sink(gr.sizeof_gr_complex*options.fft_length,
"ofdm_ifft_c.dat"))
self.connect(self.cp_adder, gr.file_sink(gr.sizeof_gr_complex,
"ofdm_cp_adder_c.dat"))
