def __init__(self, options, msgq_limit=2, pad_for_usrp=False):
"""
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._fft_length = 64
self._total_sub_carriers = 53
self._data_subcarriers = 48
self._cp_length = 16
self._regime = options.regime
self._symbol_length = self._fft_length + self._cp_length
# assuming we have 100Ms/s going to the USRP2 and 80 samples per symbol
# we can calculate the OFDM symboltime (in microseconds)
# depending on the interpolation factor
self._symbol_time = 100000000*(self._symbol_length )/(100*options.bandwidth)
self._n_sym = options.nsym
win = []
self._modulation = options.modulation
if self._modulation == "bpsk":
rotated_const = ofdm_packet_utils.bpsk(self)
elif self._modulation == "qpsk":
rotated_const = ofdm_packet_utils.qpsk(self)
elif self._modulation == "qam16":
rotated_const = ofdm_packet_utils.qam16(self)
elif self._modulation == "qam64":
rotated_const = ofdm_packet_utils.qam64(self)
# if(self._regime == "1" or self._regime == "2"):
# rotated_const = ofdm_packet_utils.bpsk(self)
#
# elif (self._regime == "3" or self._regime == "4"):
# rotated_const = ofdm_packet_utils.qpsk(self)
#
# elif(self._regime == "5" or self._regime == "6"):
# rotated_const = ofdm_packet_utils.qam16(self)
#
# elif(self._regime == "7" or self._regime == "8"):
# rotated_const = ofdm_packet_utils.qam64(self)
# map groups of bits to complex symbols
self._pkt_input = gr_ieee802_11.ofdm_symbol_mapper(rotated_const, msgq_limit, self._data_subcarriers, self._fft_length)
# insert pilot symbols
self.pilot = gr_ieee802_11.ofdm_pilot_insert(self._data_subcarriers)
# move subcarriers to their designated place and insert DC
self.cmap = gr_ieee802_11.ofdm_carrier_mapper(self._fft_length, self._total_sub_carriers)
# inverse fast fourier transform
self.ifft = gr.fft_vcc(self._fft_length, False, win, False)
# add cyclic prefix
self.cp_adder = digital_swig.ofdm_cyclic_prefixer(self._fft_length, self._symbol_length)
# scale accordingly
self.scale = gr.multiply_const_cc(1.0 / math.sqrt(self._fft_length))
# we need to know the number of OFDM data symbols for preamble and zerogap
# MODIFIED FROM ORIGINAL
# Instead of having the OFDM data symbols recorded in a python dictionary, the value of N_sym is updated when the class ofdm_mod invoked.
N_sym = self._n_sym
# add training sequence
self.preamble= ofdm_packet_utils.insert_preamble(self._symbol_length, N_sym)
# append zero samples at the end (receiver needs that to decode)
self.zerogap = ofdm_packet_utils.insert_zerogap(self._symbol_length, N_sym)
# repeat the frame a number of times
self.repeat = gr_ieee802_11.ofdm_symbol_repeater(self._symbol_length, options.repetition, N_sym)
self.s2v = gr.stream_to_vector(gr.sizeof_gr_complex , self._symbol_length)
self.v2s = gr.vector_to_stream(gr.sizeof_gr_complex , self._symbol_length)
# swap real and immaginary component before sending (GNURadio/USRP2 bug!)
self.gr_complex_to_imag_0 = gr.complex_to_imag(1)
self.gr_complex_to_real_0 = gr.complex_to_real(1)
self.gr_float_to_complex_0 = gr.float_to_complex(1)
self.connect((self.v2s, 0), (self.gr_complex_to_imag_0, 0))
self.connect((self.v2s, 0), (self.gr_complex_to_real_0, 0))
self.connect((self.gr_complex_to_imag_0, 0), (self.gr_float_to_complex_0, 1))
self.connect((self.gr_complex_to_real_0, 0), (self.gr_float_to_complex_0, 0))
self.connect((self.gr_float_to_complex_0, 0), (self))
# connect the blocks
self.connect((self._pkt_input, 0), (self.pilot, 0))
self.connect((self._pkt_input,1), (self.preamble, 1))
self.connect((self.preamble,1), (self.zerogap, 1))
#if options.repetition == 1:
self.connect(self.pilot, self.cmap, self.ifft, self.cp_adder, self.scale, self.s2v, \
self.preamble, self.zerogap, self.v2s)
#elif options.repetition > 1:
#self.connect(self.pilot, self.cmap, self.ifft, self.cp_adder, self.scale, self.s2v, self.preamble, self.zerogap, self.repeat, self.v2s)
#else:
# print"Error: repetiton must be a integer number >= 1 \n"
# sys.exit(1)
if options.log:
self.connect((self._pkt_input), gr.file_sink(gr.sizeof_gr_complex * self._data_subcarriers, "ofdm_mapper.dat"))
self.connect(self.pilot, gr.file_sink(gr.sizeof_gr_complex * (5 + self._data_subcarriers), "ofdm_pilot.dat"))
self.connect(self.cmap, gr.file_sink(gr.sizeof_gr_complex * self._fft_length, "ofdm_cmap.dat"))
self.connect(self.ifft, gr.file_sink(gr.sizeof_gr_complex * self._fft_length, "ofdm_ifft.dat"))
self.connect(self.cp_adder, gr.file_sink(gr.sizeof_gr_complex, "ofdm_cp_adder.dat"))
self.connect(self.scale, gr.file_sink(gr.sizeof_gr_complex, "ofdm_scale.dat"))
self.connect(self.preamble, gr.file_sink(gr.sizeof_gr_complex * self._symbol_length, "ofdm_preamble.dat"))
self.connect(self.zerogap, gr.file_sink(gr.sizeof_gr_complex * self._symbol_length, "ofdm_zerogap.dat"))
def __init__(self, options, payload='', msgq_limit=2, pad_for_usrp=False):
"""
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._fft_length = 64
self._total_sub_carriers = 53
self._data_subcarriers = 48
self._cp_length = 16
self._regime = options.regime
self._symbol_length = self._fft_length + self._cp_length
self._role = options.role
# assuming we have 100Ms/s going to the USRP2 and 80 samples per symbol
# we can calculate the OFDM symboltime (in microseconds)
# depending on the interpolation factor
self._symbol_time = options.interp*(self._fft_length+self._cp_length)/100
win = []
if(self._regime == "1" or self._regime == "2"):
rotated_const = ofdm_packet_utils.bpsk(self)
elif (self._regime == "3" or self._regime == "4"):
rotated_const = ofdm_packet_utils.qpsk(self)
elif(self._regime == "5" or self._regime == "6"):
rotated_const = ofdm_packet_utils.qam16(self)
elif(self._regime == "7" or self._regime == "8"):
rotated_const = ofdm_packet_utils.qam64(self)
# map groups of bits to complex symbols
self._pkt_input = ftw.ofdm_mapper(rotated_const, msgq_limit, self._data_subcarriers, self._fft_length)
# insert pilot symbols (use pnc block * by lzyou)
if self._role == 'A':
print " >>> [FPNC]: *A* Insert Pilot"
self.pilot = ftw.pnc_ofdm_pilot_cc(self._data_subcarriers, 1)
elif self._role == 'B':
print " >>> [FPNC]: *B* Insert Pilot"
self.pilot = ftw.pnc_ofdm_pilot_cc(self._data_subcarriers, 2)
else:
print " >>> [FTW ]: Insert Pilot"
self.pilot = ftw.ofdm_pilot_cc(self._data_subcarriers)
# just for test
#self.pilot = ftw.pnc_ofdm_pilot_cc(self._data_subcarriers, 1)
#self.pilot = ftw.pnc_ofdm_pilot_cc(self._data_subcarriers, 2)
# move subcarriers to their designated place and insert DC
self.cmap = ftw.ofdm_cmap_cc(self._fft_length, self._total_sub_carriers)
# inverse fast fourier transform
self.ifft = gr.fft_vcc(self._fft_length, False, win, False)
# add cyclic prefix
from gnuradio import digital
self.cp_adder = digital.ofdm_cyclic_prefixer(self._fft_length, self._symbol_length)
self.connect(gr.null_source(gr.sizeof_char), (self.cp_adder, 1)) # Note: dirty modification to accomdate the API change
# scale accordingly
self.scale = gr.multiply_const_cc(1.0 / math.sqrt(self._fft_length))
# we need to know the number of OFDM data symbols for preamble and zerogap
info = ofdm_packet_utils.get_info(payload, options.regime, self._symbol_time)
N_sym = info["N_sym"]
# add training sequence (modify by lzyou)
if self._role == 'A':
print " >>> [FPNC]: *A* Insert Preamble"
self.preamble= ofdm_packet_utils.insert_preamble(self._symbol_length, N_sym, 'A')
elif self._role == 'B':
print " >>> [FPNC]: *B* Insert Preamble"
self.preamble= ofdm_packet_utils.insert_preamble(self._symbol_length, N_sym, 'B')
else:
print " >>> [FTW ]: Insert Preamble"
self.preamble= ofdm_packet_utils.insert_preamble(self._symbol_length, N_sym)
# append zero samples at the end (receiver needs that to decode)
if self._role == None:
print " >>> [FTW ]: Insert Zerogap"
self.zerogap = ofdm_packet_utils.insert_zerogap(self._symbol_length, N_sym)
else:
print " >>> [FPNC]: Insert Zerogap"
self.zerogap = ofdm_packet_utils.insert_zerogap(self._symbol_length, N_sym, 'FPNC')
self.s2v = gr.stream_to_vector(gr.sizeof_gr_complex , self._symbol_length)
self.v2s = gr.vector_to_stream(gr.sizeof_gr_complex , self._symbol_length)
# swap real and immaginary component before sending (GNURadio/USRP2 bug!)
if options.swapIQ == True:
self.gr_complex_to_imag_0 = gr.complex_to_imag(1)
self.gr_complex_to_real_0 = gr.complex_to_real(1)
self.gr_float_to_complex_0 = gr.float_to_complex(1)
self.connect((self.v2s, 0), (self.gr_complex_to_imag_0, 0))
self.connect((self.v2s, 0), (self.gr_complex_to_real_0, 0))
self.connect((self.gr_complex_to_real_0, 0), (self.gr_float_to_complex_0, 1))
self.connect((self.gr_complex_to_imag_0, 0), (self.gr_float_to_complex_0, 0))
self.connect((self.gr_float_to_complex_0, 0), (self))
elif options.swapIQ == False:
self.gr_complex_to_imag_0 = gr.complex_to_imag(1)
self.gr_complex_to_real_0 = gr.complex_to_real(1)
self.gr_float_to_complex_0 = gr.float_to_complex(1)
self.connect((self.v2s, 0), (self.gr_complex_to_imag_0, 0))
self.connect((self.v2s, 0), (self.gr_complex_to_real_0, 0))
self.connect((self.gr_complex_to_imag_0, 0), (self.gr_float_to_complex_0, 1))
self.connect((self.gr_complex_to_real_0, 0), (self.gr_float_to_complex_0, 0))
self.connect((self.gr_float_to_complex_0, 0), (self))
# connect the blocks
self.connect((self._pkt_input, 0), (self.pilot, 0))
self.connect((self._pkt_input,1), (self.preamble, 1))
self.connect((self.preamble,1), (self.zerogap, 1))
self.connect(self.pilot, self.cmap, self.ifft, self.cp_adder, self.scale, self.s2v, self.preamble, self.zerogap, self.v2s)
if options.log:
self.connect((self._pkt_input), gr.file_sink(gr.sizeof_gr_complex * self._data_subcarriers, "ofdm_mapper.dat"))
self.connect(self.pilot, gr.file_sink(gr.sizeof_gr_complex * (5 + self._data_subcarriers), "ofdm_pilot.dat"))
self.connect(self.cmap, gr.file_sink(gr.sizeof_gr_complex * self._fft_length, "ofdm_cmap.dat"))
self.connect(self.ifft, gr.file_sink(gr.sizeof_gr_complex * self._fft_length, "ofdm_ifft.dat"))
self.connect(self.cp_adder, gr.file_sink(gr.sizeof_gr_complex, "ofdm_cp_adder.dat"))
self.connect(self.scale, gr.file_sink(gr.sizeof_gr_complex, "ofdm_scale.dat"))
self.connect(self.preamble, gr.file_sink(gr.sizeof_gr_complex * self._symbol_length, "ofdm_preamble.dat"))
self.connect(self.zerogap, gr.file_sink(gr.sizeof_gr_complex * self._symbol_length, "ofdm_zerogap.dat"))
def __init__(self, options, payload='', msgq_limit=2, pad_for_usrp=False):
"""
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._fft_length = 64
self._total_sub_carriers = 53
self._data_subcarriers = 48
self._cp_length = 16
self._regime = options.regime
self._symbol_length = self._fft_length + self._cp_length
self._role = options.role
# assuming we have 100Ms/s going to the USRP2 and 80 samples per symbol
# we can calculate the OFDM symboltime (in microseconds)
# depending on the interpolation factor
self._symbol_time = options.interp * (self._fft_length +
self._cp_length) / 100
win = []
if (self._regime == "1" or self._regime == "2"):
rotated_const = ofdm_packet_utils.bpsk(self)
elif (self._regime == "3" or self._regime == "4"):
rotated_const = ofdm_packet_utils.qpsk(self)
elif (self._regime == "5" or self._regime == "6"):
rotated_const = ofdm_packet_utils.qam16(self)
elif (self._regime == "7" or self._regime == "8"):
rotated_const = ofdm_packet_utils.qam64(self)
# map groups of bits to complex symbols
self._pkt_input = ftw.ofdm_mapper(rotated_const, msgq_limit,
self._data_subcarriers,
self._fft_length)
# insert pilot symbols (use pnc block * by lzyou)
if self._role == 'A':
print " >>> [FPNC]: *A* Insert Pilot"
self.pilot = ftw.pnc_ofdm_pilot_cc(self._data_subcarriers, 1)
elif self._role == 'B':
print " >>> [FPNC]: *B* Insert Pilot"
self.pilot = ftw.pnc_ofdm_pilot_cc(self._data_subcarriers, 2)
else:
print " >>> [FTW ]: Insert Pilot"
self.pilot = ftw.ofdm_pilot_cc(self._data_subcarriers)
# just for test
#self.pilot = ftw.pnc_ofdm_pilot_cc(self._data_subcarriers, 1)
#self.pilot = ftw.pnc_ofdm_pilot_cc(self._data_subcarriers, 2)
# move subcarriers to their designated place and insert DC
self.cmap = ftw.ofdm_cmap_cc(self._fft_length,
self._total_sub_carriers)
# inverse fast fourier transform
self.ifft = gr.fft_vcc(self._fft_length, False, win, False)
# add cyclic prefix
from gnuradio import digital
self.cp_adder = digital.ofdm_cyclic_prefixer(self._fft_length,
self._symbol_length)
self.connect(
gr.null_source(gr.sizeof_char),
(self.cp_adder,
1)) # Note: dirty modification to accomdate the API change
# scale accordingly
self.scale = gr.multiply_const_cc(1.0 / math.sqrt(self._fft_length))
# we need to know the number of OFDM data symbols for preamble and zerogap
info = ofdm_packet_utils.get_info(payload, options.regime,
self._symbol_time)
N_sym = info["N_sym"]
# add training sequence (modify by lzyou)
if self._role == 'A':
print " >>> [FPNC]: *A* Insert Preamble"
self.preamble = ofdm_packet_utils.insert_preamble(
self._symbol_length, N_sym, 'A')
elif self._role == 'B':
print " >>> [FPNC]: *B* Insert Preamble"
self.preamble = ofdm_packet_utils.insert_preamble(
self._symbol_length, N_sym, 'B')
else:
print " >>> [FTW ]: Insert Preamble"
self.preamble = ofdm_packet_utils.insert_preamble(
self._symbol_length, N_sym)
# append zero samples at the end (receiver needs that to decode)
if self._role == None:
print " >>> [FTW ]: Insert Zerogap"
self.zerogap = ofdm_packet_utils.insert_zerogap(
self._symbol_length, N_sym)
else:
print " >>> [FPNC]: Insert Zerogap"
self.zerogap = ofdm_packet_utils.insert_zerogap(
self._symbol_length, N_sym, 'FPNC')
self.s2v = gr.stream_to_vector(gr.sizeof_gr_complex,
self._symbol_length)
self.v2s = gr.vector_to_stream(gr.sizeof_gr_complex,
self._symbol_length)
# swap real and immaginary component before sending (GNURadio/USRP2 bug!)
if options.swapIQ == True:
self.gr_complex_to_imag_0 = gr.complex_to_imag(1)
self.gr_complex_to_real_0 = gr.complex_to_real(1)
self.gr_float_to_complex_0 = gr.float_to_complex(1)
self.connect((self.v2s, 0), (self.gr_complex_to_imag_0, 0))
self.connect((self.v2s, 0), (self.gr_complex_to_real_0, 0))
self.connect((self.gr_complex_to_real_0, 0),
(self.gr_float_to_complex_0, 1))
self.connect((self.gr_complex_to_imag_0, 0),
(self.gr_float_to_complex_0, 0))
self.connect((self.gr_float_to_complex_0, 0), (self))
elif options.swapIQ == False:
self.gr_complex_to_imag_0 = gr.complex_to_imag(1)
self.gr_complex_to_real_0 = gr.complex_to_real(1)
self.gr_float_to_complex_0 = gr.float_to_complex(1)
self.connect((self.v2s, 0), (self.gr_complex_to_imag_0, 0))
self.connect((self.v2s, 0), (self.gr_complex_to_real_0, 0))
self.connect((self.gr_complex_to_imag_0, 0),
(self.gr_float_to_complex_0, 1))
self.connect((self.gr_complex_to_real_0, 0),
(self.gr_float_to_complex_0, 0))
self.connect((self.gr_float_to_complex_0, 0), (self))
# connect the blocks
self.connect((self._pkt_input, 0), (self.pilot, 0))
self.connect((self._pkt_input, 1), (self.preamble, 1))
self.connect((self.preamble, 1), (self.zerogap, 1))
self.connect(self.pilot, self.cmap, self.ifft, self.cp_adder,
self.scale, self.s2v, self.preamble, self.zerogap,
self.v2s)
if options.log:
self.connect(
(self._pkt_input),
gr.file_sink(gr.sizeof_gr_complex * self._data_subcarriers,
"ofdm_mapper.dat"))
self.connect(
self.pilot,
gr.file_sink(
gr.sizeof_gr_complex * (5 + self._data_subcarriers),
"ofdm_pilot.dat"))
self.connect(
self.cmap,
gr.file_sink(gr.sizeof_gr_complex * self._fft_length,
"ofdm_cmap.dat"))
self.connect(
self.ifft,
gr.file_sink(gr.sizeof_gr_complex * self._fft_length,
"ofdm_ifft.dat"))
self.connect(
self.cp_adder,
gr.file_sink(gr.sizeof_gr_complex, "ofdm_cp_adder.dat"))
self.connect(self.scale,
gr.file_sink(gr.sizeof_gr_complex, "ofdm_scale.dat"))
self.connect(
self.preamble,
gr.file_sink(gr.sizeof_gr_complex * self._symbol_length,
"ofdm_preamble.dat"))
self.connect(
self.zerogap,
gr.file_sink(gr.sizeof_gr_complex * self._symbol_length,
"ofdm_zerogap.dat"))