def __init__(self, constellation, f, N0=0.25, seed=-666L):
"""
constellation - a constellation object used for modulation.
f - a finite state machine specification used for coding.
N0 - noise level
seed - random seed
"""
super(trellis_tb, self).__init__()
# packet size in bits (make it multiple of 16 so it can be packed in a short)
packet_size = 1024 * 16
# bits per FSM input symbol
bitspersymbol = int(round(math.log(f.I()) /
math.log(2))) # bits per FSM input symbol
# packet size in trellis steps
K = packet_size / bitspersymbol
# TX
src = gr.lfsr_32k_source_s()
# packet size in shorts
src_head = gr.head(gr.sizeof_short, packet_size / 16)
# unpack shorts to symbols compatible with the FSM input cardinality
s2fsmi = gr.packed_to_unpacked_ss(bitspersymbol, gr.GR_MSB_FIRST)
# initial FSM state = 0
enc = trellis.encoder_ss(f, 0)
mod = gr.chunks_to_symbols_sc(constellation.points(), 1)
# CHANNEL
add = gr.add_cc()
noise = gr.noise_source_c(gr.GR_GAUSSIAN, math.sqrt(N0 / 2), seed)
# RX
# data preprocessing to generate metrics for Viterbi
metrics = trellis.constellation_metrics_cf(
constellation.base(), digital_swig.TRELLIS_EUCLIDEAN)
# Put -1 if the Initial/Final states are not set.
va = trellis.viterbi_s(f, K, 0, -1)
# pack FSM input symbols to shorts
fsmi2s = gr.unpacked_to_packed_ss(bitspersymbol, gr.GR_MSB_FIRST)
# check the output
self.dst = gr.check_lfsr_32k_s()
self.connect(src, src_head, s2fsmi, enc, mod)
self.connect(mod, (add, 0))
self.connect(noise, (add, 1))
self.connect(add, metrics, va, fsmi2s, self.dst)
def __init__(self, constellation, f, N0=0.25, seed=-666L):
"""
constellation - a constellation object used for modulation.
f - a finite state machine specification used for coding.
N0 - noise level
seed - random seed
"""
super(trellis_tb, self).__init__()
# packet size in bits (make it multiple of 16 so it can be packed in a short)
packet_size = 1024*16
# bits per FSM input symbol
bitspersymbol = int(round(math.log(f.I())/math.log(2))) # bits per FSM input symbol
# packet size in trellis steps
K = packet_size/bitspersymbol
# TX
src = gr.lfsr_32k_source_s()
# packet size in shorts
src_head = gr.head (gr.sizeof_short, packet_size/16)
# unpack shorts to symbols compatible with the FSM input cardinality
s2fsmi = gr.packed_to_unpacked_ss(bitspersymbol, gr.GR_MSB_FIRST)
# initial FSM state = 0
enc = trellis.encoder_ss(f, 0)
mod = gr.chunks_to_symbols_sc(constellation.points(), 1)
# CHANNEL
add = gr.add_cc()
noise = gr.noise_source_c(gr.GR_GAUSSIAN,math.sqrt(N0/2),seed)
# RX
# data preprocessing to generate metrics for Viterbi
metrics = trellis.constellation_metrics_cf(constellation.base(), digital_swig.TRELLIS_EUCLIDEAN)
# Put -1 if the Initial/Final states are not set.
va = trellis.viterbi_s(f, K, 0, -1)
# pack FSM input symbols to shorts
fsmi2s = gr.unpacked_to_packed_ss(bitspersymbol, gr.GR_MSB_FIRST)
# check the output
self.dst = gr.check_lfsr_32k_s()
self.connect (src, src_head, s2fsmi, enc, mod)
self.connect (mod, (add, 0))
self.connect (noise, (add, 1))
self.connect (add, metrics, va, fsmi2s, self.dst)
def __init__(self, gui, options):
gr.hier_block2.__init__(self, "bpsk_mod",
gr.io_signature(1, 1, gr.sizeof_char), # Input signature
gr.io_signature(1, 1, gr.sizeof_gr_complex)) # Output signature
self._samples_per_symbol = options.sps
self.amplitude = options.amplitude
self.verbose = options.verbose
self._excess_bw = _def_excess_bw
self._gray_code = _def_gray_code
if not isinstance(self._samples_per_symbol, int) or self._samples_per_symbol < 2:
raise TypeError, ("sample per symbol must be an integer >= 2, is %d" % self._samples_per_symbol)
arity = pow(2,self.bits_per_symbol())
# turn bytes into k-bit vectors
self.packed_to_unpacked_bb = \
gr.packed_to_unpacked_bb(self.bits_per_symbol(), gr.GR_MSB_FIRST)
if self._gray_code:
self.symbol_mapper = gr.map_bb(psk.binary_to_gray[arity])
else:
self.symbol_mapper = gr.map_bb(psk.binary_to_ungray[arity])
self.diff_encoder_bb = gr.diff_encoder_bb(arity)
#This bloc allow to decode the stream
#self.scrambler = gr.scrambler_bb(0x8A, 0x7F, 7)
#Transform symbols to chips
self.symbols_to_chips = ieee.symbols_to_chips_bs()
#self.chunks2symbols = gr.chunks_to_symbols_ic(psk.constellation[arity])
self.chunks2symbols = gr.chunks_to_symbols_sc([-1+0j, 1+0j])
self.chunks2symbols_b = gr.chunks_to_symbols_bc([-1+0j, 1+0j])
# transform chips to symbols
print "bits_per_symbol", self.bits_per_symbol()
self.packed_to_unpacked_ss = \
gr.packed_to_unpacked_ss(self.bits_per_symbol(), gr.GR_MSB_FIRST)
ntaps = 11 * self._samples_per_symbol
# pulse shaping filter
self.rrc_taps = gr.firdes.root_raised_cosine(
self._samples_per_symbol * self.amplitude, # gain (samples_per_symbol since we're
# interpolating by samples_per_symbol)
self._samples_per_symbol, # sampling rate
1.0, # symbol rate
self._excess_bw, # excess bandwidth (roll-off factor)
ntaps)
self.rrc_filter = gr.interp_fir_filter_ccf(self._samples_per_symbol,
self.rrc_taps)
# Connect
#self.connect(self, self.bytes2chunks, self.symbol_mapper,self.scrambler, self.chunks2symbols, self.rrc_filter, self)
# self.wxgui_constellationsink2_0 = constsink_gl.const_sink_c(
# gui.GetWin(),
# title="Constellation Plot",
# sample_rate=self._samples_per_symbol,
# frame_rate=5,
# const_size=2048,
# M=2,
# theta=0,
# alpha=0.005,
# fmax=0.06,
# mu=0.5,
# gain_mu=0.005,
# symbol_rate=self._samples_per_symbol/2,
# omega_limit=0.005,
# )
# gui.Add(self.wxgui_constellationsink2_0.win)
#Modefied for IEEE 802.15.4
#self.connect(self, self.packed_to_unpacked_bb, self.symbol_mapper, self.diff_encoder_bb, self.symbols_to_chips, self.packed_to_unpacked_ss, self.chunks2symbols, self.rrc_filter, self)
self.connect(self, self.packed_to_unpacked_bb, self.symbol_mapper, self.symbols_to_chips, self.packed_to_unpacked_ss, self.chunks2symbols, self.rrc_filter, self)
#self.connect(self, self.symbols_to_chips, self.packed_to_unpacked_ss, self.chunks2symbols, self.rrc_filter, self)
#self.connect(self, self.packed_to_unpacked_ss, self.chunks2symbols, self.rrc_filter, self)
#self.connect(self, self._scrambler, self.chunks2symbols_b, self.rrc_filter, self)
#self.connect(self.rrc_filter, self.wxgui_constellationsink2_0)
if self.verbose:
self._print_verbage()
def __init__(self, principal_gui, options):
gr.hier_block2.__init__(self, "bpsk_mod",
gr.io_signature(1, 1, gr.sizeof_char), # Input signature
gr.io_signature(1, 1, gr.sizeof_gr_complex)) # Output signature
self._samples_per_symbol = options.sps
self.amplitude = options.amplitude
self.verbose = options.verbose
self._excess_bw = _def_excess_bw
self._gray_code = _def_gray_code
if not isinstance(self._samples_per_symbol, int) or self._samples_per_symbol < 2:
raise TypeError, ("sample per symbol must be an integer >= 2, is %d" % self._samples_per_symbol)
arity = pow(2,self.bits_per_symbol())
#arity = pow (2, 2)
# turn bytes into k-bit vectors
self.packed_to_unpacked_bb = \
gr.packed_to_unpacked_bb(self.bits_per_symbol(), gr.GR_MSB_FIRST)
if self._gray_code:
map_param = psk.binary_to_gray[arity]
self.symbol_mapper = gr.map_bb(map_param)
else:
self.symbol_mapper = gr.map_bb(psk.binary_to_ungray[arity])
self.diff_encoder_bb = gr.diff_encoder_bb(arity)
#This bloc allow to decode the stream
#self.scrambler = gr.scrambler_bb(0x8A, 0x7F, 7)
#Transform symbols to chips
self.symbols_to_chips = ieee.symbols_to_chips_bs()
#self.chunks2symbols = gr.chunks_to_symbols_ic(psk.constellation[arity])
self.chunks2symbols = gr.chunks_to_symbols_sc([-1+0j, 1+0j])
self.chunks2symbols_b = gr.chunks_to_symbols_bc([-1+0j, 1+0j])
# transform chips to symbols
print "bits_per_symbol", self.bits_per_symbol()
self.packed_to_unpacked_ss = \
gr.packed_to_unpacked_ss(self.bits_per_symbol(), gr.GR_MSB_FIRST)
ntaps = 11 * self._samples_per_symbol
# pulse shaping filter
self.rrc_taps = gr.firdes.root_raised_cosine(
self._samples_per_symbol, # gain (samples_per_symbol since we're
# interpolating by samples_per_symbol)
self._samples_per_symbol, # sampling rate
1.0, # symbol rate
self._excess_bw, # excess bandwidth (roll-off factor)
ntaps)
self.rrc_filter = gr.interp_fir_filter_ccf(self._samples_per_symbol,
self.rrc_taps)
# Connect
#self.connect(self, self.bytes2chunks, self.symbol_mapper,self.scrambler, self.chunks2symbols, self.rrc_filter, self)
#Modefied for IEEE 802.15.4
#self.connect(self, self.packed_to_unpacked_bb, self.symbol_mapper, self.diff_encoder_bb, self.symbols_to_chips, self.packed_to_unpacked_ss, self.chunks2symbols, self.rrc_filter, self)
#For IEEE 802.15.4 915 868 MHz standard
self.connect(self, self.packed_to_unpacked_bb, self.symbol_mapper, self.symbols_to_chips, self.packed_to_unpacked_ss, self.chunks2symbols, self.rrc_filter, self)
#self.connect(self, self.symbols_to_chips, self.packed_to_unpacked_ss, self.chunks2symbols, self.rrc_filter, self)
#self.connect(self, self.packed_to_unpacked_ss, self.chunks2symbols, self.rrc_filter, self)
#case when we use a stream of bits
#self.connect(self, self.chunks2symbols_b, self.rrc_filter, self)
if self.verbose:
self._print_verbage()
