def __init__(self, options, callback=None):
"""
Hierarchical block for demodulating and deframing packets.
The input is the complex modulated signal at baseband.
Demodulated packets are sent to the handler.
@param options: pass modulation options from higher layers (fft length, occupied tones, etc.)
@param callback: function of two args: ok, payload
@type callback: ok: bool; payload: string
"""
gr.hier_block2.__init__(
self,
"ofdm_demod",
gr.io_signature(1, 1, gr.sizeof_gr_complex), # Input signature
gr.io_signature(1, 1, gr.sizeof_gr_complex)) # Output signature
self._rcvd_pktq = gr.msg_queue() # holds packets from the PHY
self._modulation = options.modulation
self._fft_length = options.fft_length
self._occupied_tones = options.occupied_tones
self._cp_length = options.cp_length
self._snr = options.snr
self._carrier_map = options.carrier_map # linklab
self._nc_filter = options.nc_filter # linklab
# linklab, sanity check carrier_map
if ((4 * len(self._carrier_map) != self._occupied_tones) &
(self._carrier_map != 'FFFF')):
print(
"Error: --carrier-map size %d is no equal to # of --occupied-tones"
) % (4 * (len(self._carrier_map)))
raise SystemExit
# check occupied_tones and cp_length
if ((self._fft_length < self._occupied_tones) |
(self._fft_length < self._cp_length)):
print(
"Error: --occupied-tones or --cp-length specified must not biger than --fft-length"
)
raise SystemExit
# 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, )
# linklab, get subcarrier allocation from carrier_map
self.calc_carrier_map(self._carrier_map)
symbol_length = self._fft_length + self._cp_length
# linklab, add carrier_map_bin
symbol_length = self._fft_length + self._cp_length
self.ofdm_recv = ofdm_receiver(
self._fft_length,
self._cp_length,
self._occupied_tones,
self._snr,
preambles,
self._carrier_map_bin,
self._nc_filter, #linklab
options.log)
if VERBOSE:
print "%s:%s" % (os.path.basename(__file__), __name__)
print "(ofdm_demod) preambles= ", preambles
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
phgain = 0.25
frgain = phgain * phgain / 4.0
self.ofdm_demod = gr_papyrus.ofdm_frame_sink(
rotated_const, range(arity), self._rcvd_pktq, self._fft_length,
self._occupied_tones, self._carrier_map_bin_str, phgain, frgain)
self.connect(self, self.ofdm_recv)
self.connect((self.ofdm_recv, 0), (self.ofdm_demod, 0))
self.connect((self.ofdm_recv, 1), (self.ofdm_demod, 1))
# added output signature to work around bug, though it might not be a bad
# thing to export, anyway
self.connect(self.ofdm_recv.chan_filt, self)
if options.log:
self.connect(
self.ofdm_demod,
gr.file_sink(gr.sizeof_gr_complex * self._occupied_tones,
"ofdm_frame_sink_c.dat"))
else:
self.connect(
self.ofdm_demod,
blocks.null_sink(gr.sizeof_gr_complex * self._occupied_tones))
if options.verbose:
self._print_verbage()
# linklab, add ofdm_recv to queue watcher
#self._watcher = _queue_watcher_thread(self._rcvd_pktq, callback),
self._watcher = _queue_watcher_thread(self._rcvd_pktq, self.ofdm_recv,
callback)
def __init__(self, options, callback=None):
"""
Hierarchical block for demodulating and deframing packets.
The input is the complex modulated signal at baseband.
Demodulated packets are sent to the handler.
@param options: pass modulation options from higher layers (fft length, occupied tones, etc.)
@param callback: function of two args: ok, payload
@type callback: ok: bool; payload: string
"""
gr.hier_block2.__init__(self, "ofdm_demod",
gr.io_signature(1, 1, gr.sizeof_gr_complex), # Input signature
gr.io_signature(1, 1, gr.sizeof_gr_complex)) # Output signature
self._rcvd_pktq = gr.msg_queue() # holds packets from the PHY
self._modulation = options.modulation
self._fft_length = options.fft_length
self._occupied_tones = options.occupied_tones
self._cp_length = options.cp_length
self._snr = options.snr
# 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,)
symbol_length = self._fft_length + self._cp_length
self.ofdm_recv = ofdm_receiver(self._fft_length,
self._cp_length,
self._occupied_tones,
self._snr, preambles,
options.log)
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
phgain = 0.25
frgain = phgain*phgain / 4.0
self.ofdm_demod = digital_swig.ofdm_frame_sink(rotated_const, range(arity),
self._rcvd_pktq,
self._occupied_tones,
phgain, frgain)
self.connect(self, self.ofdm_recv)
self.connect((self.ofdm_recv, 0), (self.ofdm_demod, 0))
self.connect((self.ofdm_recv, 1), (self.ofdm_demod, 1))
# added output signature to work around bug, though it might not be a bad
# thing to export, anyway
self.connect(self.ofdm_recv.chan_filt, self)
if options.log:
self.connect(self.ofdm_demod,
gr.file_sink(gr.sizeof_gr_complex*self._occupied_tones,
"ofdm_frame_sink_c.dat"))
else:
self.connect(self.ofdm_demod,
gr.null_sink(gr.sizeof_gr_complex*self._occupied_tones))
if options.verbose:
self._print_verbage()
self._watcher = _queue_watcher_thread(self._rcvd_pktq, callback)
def __init__(self, options, callback=None):
"""
Hierarchical block for demodulating and deframing packets.
The input is the complex modulated signal at baseband.
Demodulated packets are sent to the handler.
@param options: pass modulation options from higher layers (fft length, occupied tones, etc.)
@param callback: function of two args: ok, payload
@type callback: ok: bool; payload: string
"""
gr.hier_block2.__init__(self, "ofdm_demod",
gr.io_signature(1, 1, gr.sizeof_gr_complex), # Input signature
gr.io_signature(2, 2, gr.sizeof_gr_complex)) # Output signature
self._rcvd_pktq = gr.msg_queue() # holds packets from the PHY
self._modulation = options.modulation
self._fft_length = options.fft_length
self._occupied_tones = options.occupied_tones
self._cp_length = options.cp_length
self._snr = options.snr
self._show_vector_analyzer = options.show_vector_analyzer
# 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,)
symbol_length = self._fft_length + self._cp_length
self.ofdm_recv = ofdm_receiver(self._fft_length,
self._cp_length,
self._occupied_tones,
self._snr, preambles,
options.log)
mods = {"qpsk": 4, "qam16": 16, "qam64": 64}
arity = mods[self._modulation]
rot = 1
# FIXME: pass the constellation objects instead of just the points
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
phgain = 0.25
frgain = phgain*phgain / 4.0
#Create constellation objects for pilot signals
cs_constel = dvbt_constellations.dvbt_cs_pilots()
tps_constel = dvbt_constellations.dvbt_tps_pilots()
self.ofdm_demod = digital_swig.dvbt_ofdm_frame_sink(rotated_const, tps_constel.points(),
cs_constel.points(), range(arity),
self._rcvd_pktq,
self._occupied_tones,
phgain, frgain)
self.connect(self, self.ofdm_recv)
self.connect((self.ofdm_recv, 0), (self.ofdm_demod, 0))
self.connect((self.ofdm_recv, 1), (self.ofdm_demod, 1))
# Vector analyzer output
self.connect((self.ofdm_recv, 0), (self, 1))
#if(self._show_vector_analyzer == "yes"):
# For qt
# self.connect((self.ofdm_recv, 0), (self.ofdm_vector_analyzer_c, 0))
self.connect(self.ofdm_recv.chan_filt, self)
if options.log:
self.connect(self.ofdm_demod,
gr.file_sink(gr.sizeof_gr_complex*self._occupied_tones,
"ofdm_frame_sink_c.dat"))
else:
self.connect(self.ofdm_demod,
gr.null_sink(gr.sizeof_gr_complex*self._occupied_tones))
if options.verbose:
self._print_verbage()
self._watcher = _queue_watcher_thread(self._rcvd_pktq, callback)
def __init__(self, options, num_channels, callback=None):
"""
Hierarchical block for demodulating and deframing packets.
The input is the complex modulated signal at baseband.
Demodulated packets are sent to the handler.
Args:
options: pass modulation options from higher layers (fft length, occupied tones, etc.)
callback: function of two args: ok, payload (ok: bool; payload: string)
"""
self.rx_channels = num_channels#len(options.args.split(','))
gr.hier_block2.__init__(self, "ofdm_demod",
gr.io_signaturev(self.rx_channels, self.rx_channels, gen_multiple_ios(self.rx_channels,1) ), # Input signature
gr.io_signaturev(self.rx_channels, self.rx_channels, gen_multiple_ios(self.rx_channels,options.occupied_tones) ))
#[gr.sizeof_gr_complex*options.occupied_tones, gr.sizeof_gr_complex*options.occupied_tones])) # Output signature
self._rcvd_pktq = gr.msg_queue() # holds packets from the PHY from all receive channels
self._modulation = options.modulation
self._fft_length = options.fft_length
self._occupied_tones = options.occupied_tones
self._cp_length = options.cp_length
self._snr = options.snr
# 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,)
symbol_length = self._fft_length + self._cp_length
self.ofdm_recv = ofdm_receiver(self.rx_channels, self._fft_length,
self._cp_length,
self._occupied_tones,
self._snr, preambles,
options.log)
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
phgain = 0.25
frgain = phgain*phgain / 4.0
# self.ofdm_demod = ofdm.ofdm_frame_sink(rotated_const, range(arity),self._rcvd_pktq,self._occupied_tones,phgain, frgain, 3)
self.ofdm_demod = ofdm.ofdm_mrx_frame_sink(rotated_const, range(arity),self._rcvd_pktq,self._occupied_tones,phgain, frgain, self.rx_channels)
self.mdb = blocks.message_debug()
############# CONNECTIONS ##############
# Connect ofdm_receiver flag to ofdm framer flag
self.connect((self.ofdm_recv, 1), (self.ofdm_demod, 0)) # Connect flag from 1st chain only
# Connect frame sink msg port to debugger
self.msg_connect((self.ofdm_demod, 'packet'), (self.mdb,'print'))
# Connect remaining data ports
port = 0
for c in range(self.rx_channels):
# Connect USRP's to channel filters
self.connect((self,c), (self.ofdm_recv,c))
# Add null sink
object_name_ns = 'null_sink_'+str(c)
setattr(self, object_name_ns, blocks.null_sink(gr.sizeof_char*1))
# Connect ofdm_receiver to ofdm framer
self.connect((self.ofdm_recv, port), (self.ofdm_demod, c+1)) # Occupied tones
# Connect extra port(s) to null since we dont need it now
self.connect((self.ofdm_recv, port+1), (getattr(self,object_name_ns), 0))
port = port + 2
# Connect equalized signals to output
self.connect((self.ofdm_demod, c), (self, c))
# added output signature to work around bug, though it might not be a bad
# thing to export, anyway
# self.connect(self.ofdm_recv.chan_filt, (self,0))
############## ##############
if options.log:
self.connect(self.ofdm_demod,
blocks.file_sink(gr.sizeof_gr_complex*self._occupied_tones,
"ofdm_frame_sink_c.dat"))
else:
self.connect(self.ofdm_demod,
blocks.null_sink(gr.sizeof_gr_complex*self._occupied_tones))
if options.verbose:
self._print_verbage()
self._watcher = _queue_watcher_thread(self._rcvd_pktq, callback)
def __init__(self, options, callback=None):
"""
Hierarchical block for demodulating and deframing packets.
The input is the complex modulated signal at baseband.
Demodulated packets are sent to the handler.
@param options: pass modulation options from higher layers (fft length, occupied tones, etc.)
@param callback: function of two args: ok, payload
@type callback: ok: bool; payload: string
"""
gr.hier_block2.__init__(self, "ofdm_demod",
gr.io_signature(1, 1, gr.sizeof_gr_complex), # Input signature
gr.io_signature(1, 1, gr.sizeof_gr_complex)) # Output signature
self._rcvd_pktq = gr.msg_queue() # holds packets from the PHY
self._modulation = options.modulation
self._fft_length = options.fft_length
self._occupied_tones = options.occupied_tones
self._cp_length = options.cp_length
self._snr = options.snr
self._bandwidth = options.bandwidth
self._precoding = False #options.precoding
# 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,)
symbol_length = self._fft_length + self._cp_length
self.ofdm_recv = ofdm_receiver(self._bandwidth,
self._fft_length,
self._cp_length,
self._occupied_tones,
self._snr, preambles,
options.log, options.mode)
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
phgain = 0.25
frgain = phgain*phgain / 4.0
self.ofdm_demod = digital_swig.ofdm_frame_sink(rotated_const, range(arity),
self._rcvd_pktq,
self._occupied_tones,
phgain, frgain)
self.connect(self, self.ofdm_recv)
self.connect((self.ofdm_recv, 0), (self.ofdm_demod, 0))
self.connect((self.ofdm_recv, 1), (self.ofdm_demod, 1))
if self._precoding:
self.connect((self.ofdm_recv, 2), (self.ofdm_demod, 2)) # output CFO value
# added output signature to work around bug, though it might not be a bad
# thing to export, anyway
self.connect(self.ofdm_recv.chan_filt, self)
if options.log:
self.connect(self.ofdm_demod,
gr.file_sink(gr.sizeof_gr_complex*self._occupied_tones,
"ofdm_frame_sink_c.dat"))
else:
self.connect(self.ofdm_demod,
gr.null_sink(gr.sizeof_gr_complex*self._occupied_tones))
if options.verbose:
self._print_verbage()
self._watcher = _queue_watcher_thread(self._rcvd_pktq, callback)
def __init__(self, options, callback=None, fwd_callback=None):
"""
Hierarchical block for demodulating and deframing packets.
The input is the complex modulated signal at baseband.
Demodulated packets are sent to the handler.
@param options: pass modulation options from higher layers (fft length, occupied tones, etc.)
@param callback: function of two args: ok, payload
@type callback: ok: bool; payload: string
"""
gr.hier_block2.__init__(self, "ofdm_demod",
gr.io_signature(1, 1, gr.sizeof_gr_complex), # Input signature
gr.io_signature(1, 1, gr.sizeof_gr_complex)) # Output signature
self._rcvd_pktq = gr.msg_queue() # holds packets from the PHY
# apurv++ queues #
self._out_pktq = gr.msg_queue()
self._modulation = options.modulation
self._fft_length = options.fft_length
self._occupied_tones = options.occupied_tones
self._cp_length = options.cp_length
self._snr = options.snr
# apurv++ start #
self._id = options.id
self._fec_n = options.fec_n
self._fec_k = options.fec_k
self._batch_size = options.batch_size
self._threshold = options.threshold
self._size = options.size
if(self._fec_n < self._fec_k):
print "ERROR: K > N in FEC!\n"
exit(0);
# apurv++ end #
# 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))
# apurv: use the preamble as a function of hop number #
#ksfreq = known_symbols_4512_3[0:self._occupied_tones]
start_index = (options.hop-1) * self._occupied_tones
ksfreq = known_symbols_4512_3[start_index:start_index + self._occupied_tones]
# allow another full preamble (no intermediate 0s for accurate channel estimate/snr measurement)
preamble2_offset = 10*self._occupied_tones;
ksfreq2 = known_symbols_4512_3[preamble2_offset:preamble2_offset+self._occupied_tones]
'''
# inserting zeros in every other frequency bin #
for i in range(len(ksfreq)):
if((zeros_on_left + i) & 1):
ksfreq[i] = 0
'''
# hard-coded known symbols
preambles = (ksfreq, ksfreq2) #, ksfreq2, ksfreq2, ksfreq2) # coarse_offset from 1st preamble, equalizer from the rest
symbol_length = self._fft_length + self._cp_length
self.ofdm_recv = ofdm_receiver(self._fft_length, self._cp_length,
self._occupied_tones, self._snr, preambles,
self._threshold, options, options.log)
mods = {"bpsk": 2, "qpsk": 4, "8psk": 8, "qam8": 8, "qam16": 16, "qam64": 64, "qam256": 256}
# apurv: support for other modulations, pass 2 constellation objects #
hdr_rot = 1
hdr_arity = mods["bpsk"]
hdr_constel = psk.psk_constellation(hdr_arity)
hdr_rotated_const = map(lambda pt: pt * hdr_rot, hdr_constel.points())
data_rot = 1
data_arity = mods[self._modulation]
if self._modulation == "qpsk":
data_rot = (0.707+0.707j)
if(self._modulation.find("psk") >= 0):
data_constel = psk.psk_constellation(data_arity)
data_rotated_const = map(lambda pt: pt * data_rot, data_constel.points())
elif(self._modulation.find("qam") >= 0):
data_constel = qam.qam_constellation(data_arity)
data_rotated_const = map(lambda pt: pt * data_rot, data_constel.points())
self._bits_per_symbol = int(math.log(mods[self._modulation], 2)) # just a useless parameter now #
phgain = 0.25
frgain = phgain*phgain / 4.0
# preambles contains all the 'preambles' used in frame_acquisition + 1 (for snr calculation)
preambles = (ksfreq, ksfreq2, ksfreq2) #, ksfreq2, ksfreq2, ksfreq2) # send the extra symbol for snr calculation
self.ofdm_demod = digital_swig.ofdm_frame_sink(hdr_rotated_const, range(hdr_arity),
data_rotated_const, range(data_arity),
preambles,
self._rcvd_pktq, self._out_pktq,
self._occupied_tones, self._fft_length, options.proto, options.ack,
phgain, frgain, self._id,
self._batch_size,
self._size, self._fec_n, self._fec_k)
self.connect(self, self.ofdm_recv)
manual = options.rx_manual # apurv++: manual testing flag
if manual==0:
self.connect((self.ofdm_recv, 0), (self.ofdm_demod, 0))
self.connect((self.ofdm_recv, 1), (self.ofdm_demod, 1))
self.connect((self.ofdm_recv, 2), (self.ofdm_demod, 2)) # apurv++, hestimates #
elif manual==1:
self.connect(gr.file_source(gr.sizeof_gr_complex*self._occupied_tones, "out-tx.dat"), (self.ofdm_demod, 0))
self.connect(gr.file_source(gr.sizeof_char, "out-timing.dat"), (self.ofdm_demod, 1))
# added output signature to work around bug, though it might not be a bad thing to export, anyway #
self.connect(self.ofdm_recv.chan_filt, self)
'''
# sink some stuff #
self.connect((self.ofdm_recv, 0), gr.null_sink(gr.sizeof_gr_complex*self._occupied_tones)) # symbols
self.connect((self.ofdm_recv, 1), gr.null_sink(gr.sizeof_char)) # timing
self.connect((self.ofdm_recv, 2), gr.null_sink(gr.sizeof_gr_complex*self._occupied_tones)) # hestimates
'''
if options.verbose:
self._print_verbage()
self._watcher = _queue_watcher_thread(self._rcvd_pktq, callback, self._fec_n, self._fec_k, self._bits_per_symbol, self._size)
self._watcher_fwd = _queue_watcher_thread(self._out_pktq, fwd_callback) # apurv++
def __init__(self, rx_callback, options):
gr.hier_block2.__init__(self, "receive_path",
gr.io_signature(1, 1, gr.sizeof_gr_complex),
gr.io_signature(0, 0, 0))
options = copy.copy(options) # make a copy so we can destructively modify
self._verbose = options.verbose
self._log = options.log
self._rx_callback = rx_callback # this callback is fired when there's a packet available
self._rcvd_pktq = gr.msg_queue() # holds packets from the PHY
self._modulation = options.modulation
self._fft_length = options.fft_length
self._occupied_tones = options.occupied_tones
self._cp_length = options.cp_length
self._snr = options.snr
# 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))
preamble_sequence = known_symbols_4512_3[0:self._occupied_tones]
training_sequence = ( known_symbols_4512_3[self._occupied_tones:self._occupied_tones*2], \
known_symbols_4512_3[self._occupied_tones*2:self._occupied_tones*3] )
for i in range(len(preamble_sequence)):
if((zeros_on_left + i) & 1):
preamble_sequence[i] = 0
# hard-coded known symbols
preambles = (preamble_sequence,)
symbol_length = self._fft_length + self._cp_length
self.ofdm_recv = ofdm_receiver(self._fft_length,
self._cp_length,
self._occupied_tones,
self._snr,
preambles,
training_sequence,
options.log)
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
phgain = 0.25
frgain = phgain*phgain / 4.0
self.ofdm_demod = gtlib.ofdm_frame_sink(rotated_const, range(arity),
self._rcvd_pktq,
self._occupied_tones,
phgain, frgain)
"""
# receiver
self.ofdm_rx = ofdm.ofdm_demod(options,
callback=self._rx_callback)
"""
# Carrier Sensing Blocks
alpha = 0.001
thresh = 30 # in dB, will have to adjust
self.probe = gr.probe_avg_mag_sqrd_c(thresh,alpha)
self.connect(self, self.ofdm_recv)
self.connect((self.ofdm_recv, 0), (self.ofdm_demod, 0))
self.connect((self.ofdm_recv, 1), (self.ofdm_demod, 1))
# added output signature to work around bug, though it might not be a bad
# thing to export, anyway
self.connect(self.ofdm_recv.chan_filt, self.probe)
if options.log:
self.connect(self.ofdm_demod,
gr.file_sink(gr.sizeof_gr_complex*self._occupied_tones,
"ofdm_frame_sink_c.dat"))
else:
self.connect(self.ofdm_demod,
gr.null_sink(gr.sizeof_gr_complex*self._occupied_tones))
# Display some information about the setup
if self._verbose:
self._print_verbage()
self._watcher = _queue_watcher_thread(self._rcvd_pktq, self._rx_callback)
def __init__(self, options, callback=None):
"""
Hierarchical block for demodulating and deframing packets.
The input is the complex modulated signal at baseband.
Demodulated packets are sent to the handler.
@param options: pass modulation options from higher layers (fft length, occupied tones, etc.)
@param callback: function of two args: ok, payload
@type callback: ok: bool; payload: string
"""
gr.hier_block2.__init__(self, "ofdm_demod",
gr.io_signature(1, 1, gr.sizeof_gr_complex), # Input signature
gr.io_signature(1, 1, gr.sizeof_gr_complex)) # Output signature
self._rcvd_pktq = gr.msg_queue() # holds packets from the PHY
self._modulation = options.modulation
self._fft_length = options.fft_length
self._occupied_tones = options.occupied_tones
self._cp_length = options.cp_length
self._snr = options.snr
self._carrier_map = options.carrier_map # linklab
self._nc_filter = options.nc_filter # linklab
# linklab, sanity check carrier_map
if ((4*len(self._carrier_map) != self._occupied_tones) & (self._carrier_map != 'FFFF')):
print("Error: --carrier-map size %d is no equal to # of --occupied-tones") %(4*(len(self._carrier_map)))
raise SystemExit
# check occupied_tones and cp_length
if ((self._fft_length < self._occupied_tones) | (self._fft_length < self._cp_length)):
print("Error: --occupied-tones or --cp-length specified must not biger than --fft-length")
raise SystemExit
# 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,)
# linklab, get subcarrier allocation from carrier_map
self.calc_carrier_map(self._carrier_map)
symbol_length = self._fft_length + self._cp_length
# linklab, add carrier_map_bin
symbol_length = self._fft_length + self._cp_length
self.ofdm_recv = ofdm_receiver(self._fft_length,
self._cp_length,
self._occupied_tones,
self._snr, preambles,
self._carrier_map_bin,
self._nc_filter, #linklab
options.log)
if VERBOSE:
print "%s:%s" %(os.path.basename(__file__), __name__)
print "(ofdm_demod) preambles= ", preambles
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
phgain = 0.25
frgain = phgain*phgain / 4.0
self.ofdm_demod = gr_papyrus.ofdm_frame_sink(rotated_const, range(arity),
self._rcvd_pktq,
self._fft_length,
self._occupied_tones,
self._carrier_map_bin_str,
phgain, frgain)
self.connect(self, self.ofdm_recv)
self.connect((self.ofdm_recv, 0), (self.ofdm_demod, 0))
self.connect((self.ofdm_recv, 1), (self.ofdm_demod, 1))
# added output signature to work around bug, though it might not be a bad
# thing to export, anyway
self.connect(self.ofdm_recv.chan_filt, self)
if options.log:
self.connect(self.ofdm_demod,
gr.file_sink(gr.sizeof_gr_complex*self._occupied_tones,
"ofdm_frame_sink_c.dat"))
else:
self.connect(self.ofdm_demod,
blocks.null_sink(gr.sizeof_gr_complex*self._occupied_tones))
if options.verbose:
self._print_verbage()
# linklab, add ofdm_recv to queue watcher
#self._watcher = _queue_watcher_thread(self._rcvd_pktq, callback),
self._watcher = _queue_watcher_thread(self._rcvd_pktq, self.ofdm_recv, callback)
def __init__(self, options, callback=None):
"""
Hierarchical block for demodulating and deframing packets.
The input is the complex modulated signal at baseband.
Demodulated packets are sent to the handler.
@param options: pass modulation options from higher layers (fft length, occupied tones, etc.)
@param callback: function of two args: ok, payload
@type callback: ok: bool; payload: string
"""
gr.hier_block2.__init__(self, "ofdm_demod",
gr.io_signature(1, 1, gr.sizeof_gr_complex), # Input signature
gr.io_signature2(2, 2, gr.sizeof_gr_complex, gr.sizeof_float)) # Output signature
self._rcvd_pktq = gr.msg_queue() # holds packets from the PHY
self._modulation = options.modulation
self._fft_length = options.fft_length
self._occupied_tones = options.occupied_tones
self._cp_length = options.cp_length
self._snr = options.snr
self._use_coding = options.coding
self._coding_block_length = options.block_length
self._adaptive_coding_enabled = options.adaptive_coding
self._rfcenterfreq = options.rx_freq
self._bandwidth = options.my_bandwidth
self._logging = lincolnlog.LincolnLog(__name__)
self._expected_pkt_size = options.expected_pkt_size
self._vcsthresh = options.vcsthresh
# if backoff is negative, calculate backoff value from options.expected_pkt_size
if options.backoff < 0:
self._vcsbackoff = predict_pack_size( self._expected_pkt_size, self._use_coding, self._modulation, self._occupied_tones, self._cp_length, self._fft_length )
# otherwise use the value in options.backoff
else:
self._vcsbackoff = options.backoff
# 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,)
symbol_length = self._fft_length + self._cp_length
self.ofdm_recv = ofdm_receiver(self._fft_length,
self._cp_length,
self._occupied_tones,
self._snr, preambles,
self._vcsthresh,
self._vcsbackoff,
options.log, options.coding)
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
phgain = 0.25
frgain = phgain*phgain / 4.0
self.ofdm_demod = digital_ll.ofdm_frame_sink(rotated_const, range(arity),
self._rcvd_pktq,
self._occupied_tones,
phgain, frgain)
self.nsink = gr.null_sink(gr.sizeof_float)
self.connect(self, self.ofdm_recv)
self.connect((self.ofdm_recv, 0), (self.ofdm_demod, 0))
self.connect((self.ofdm_recv, 1), (self.ofdm_demod, 1))
# Output the VCS signal so that the MAC layer knows when the
# channel is occupied
#self.connect((self.ofdm_recv, 2), gr.null_sink(gr.sizeof_float))
self.connect((self.ofdm_recv, 2), (self, 1))
# added output signature to work around bug, though it might not be a bad
# thing to export, anyway
self.connect(self.ofdm_recv.chan_filt, (self,0))
if options.log:
self.connect(self.ofdm_demod,
gr.file_sink(gr.sizeof_gr_complex*self._occupied_tones,
"ofdm_frame_sink_c.dat"))
else:
self.connect(self.ofdm_demod,
gr.null_sink(gr.sizeof_gr_complex*self._occupied_tones))
if options.verbose:
self._print_verbage()
self._watcher = _queue_watcher_thread(self._rcvd_pktq, callback, self._use_coding, self._coding_block_length, self._adaptive_coding_enabled,
self._rfcenterfreq,self._bandwidth,self._logging)