def main():
tb = gr.top_block()
# noise source
n = mlse.randint_b(2)
reshape_n = gr.stream_to_vector(1, 58*2)
tb.connect(n,reshape_n)
# limit experiment length
head=gr.head(58*2,1)
tb.connect(reshape_n, head)
# modulate
gsm_burstmod = gsm.gsm_modulate_burst()
tb.connect(head, gsm_burstmod)
random_tsc_index = mlse.randint_b(8);
tb.connect(random_tsc_index, (gsm_burstmod,1))
# apply channel
channel = gsm.my_channel(-100,[0.2,1,0.2])
channel_apply = gsm.apply_channel_to_vect(148, channel, 1)
tb.connect(gsm_burstmod, channel_apply)
# derotate
derot = mlse.derotate_cc(148,4,-1) #FIXME: why -1? (not as if it matters)
tb.connect(channel_apply, derot)
modsink = gr.vector_sink_c(148)
datasink = gr.vector_sink_b(58*2)
tb.connect(derot, modsink)
tb.connect(head, datasink)
# mlse-decode
decode = mlse.equalizer_midamble_vcb(mlse.make_packet_config_gsm())
tb.connect(derot,decode)
tb.connect(random_tsc_index, (decode,1))
# ber
ber = mlse.ber_vbi(58*2)
tb.connect(decode, ber)
tb.connect(head, (ber,1))
result_sink = gr.vector_sink_b(58*2)
tb.connect(decode, result_sink)
chanest_sink = gr.vector_sink_c(7)
tb.connect((decode,1), chanest_sink)
tb.run()
tb.run()
d=modsink.data()
# printvect_c(d)
print ber.bit_error_rate()
print_bitvect( datasink.data())
print_bitvect( result_sink.data())
import operator
print_bitvect( map(operator.xor, datasink.data(), result_sink.data()))
printvect_c( chanest_sink.data())
def main():
tb = gr.top_block()
# noise source
n = mlse.randint_b(2)
reshape_n = gr.stream_to_vector(1, 58 * 2)
tb.connect(n, reshape_n)
# limit experiment length
head = gr.head(58 * 2, 1)
tb.connect(reshape_n, head)
# modulate
gsm_burstmod = gsm.gsm_modulate_burst()
tb.connect(head, gsm_burstmod)
random_tsc_index = mlse.randint_b(8)
tb.connect(random_tsc_index, (gsm_burstmod, 1))
# apply channel
channel = gsm.my_channel(-100, [0.2, 1, 0.2])
channel_apply = gsm.apply_channel_to_vect(148, channel, 1)
tb.connect(gsm_burstmod, channel_apply)
# derotate
derot = mlse.derotate_cc(148, 4,
-1) #FIXME: why -1? (not as if it matters)
tb.connect(channel_apply, derot)
modsink = gr.vector_sink_c(148)
datasink = gr.vector_sink_b(58 * 2)
tb.connect(derot, modsink)
tb.connect(head, datasink)
# mlse-decode
decode = mlse.equalizer_midamble_vcb(mlse.make_packet_config_gsm())
tb.connect(derot, decode)
tb.connect(random_tsc_index, (decode, 1))
# ber
ber = mlse.ber_vbi(58 * 2)
tb.connect(decode, ber)
tb.connect(head, (ber, 1))
result_sink = gr.vector_sink_b(58 * 2)
tb.connect(decode, result_sink)
chanest_sink = gr.vector_sink_c(7)
tb.connect((decode, 1), chanest_sink)
tb.run()
tb.run()
d = modsink.data()
# printvect_c(d)
print ber.bit_error_rate()
print_bitvect(datasink.data())
print_bitvect(result_sink.data())
import operator
print_bitvect(map(operator.xor, datasink.data(), result_sink.data()))
printvect_c(chanest_sink.data())
def make_flowgraph(self):
tb = gr.top_block()
# noise source
n = mlse.randint_b(2)
reshape_n = gr.stream_to_vector(1, 58 * 2)
tb.connect(n, reshape_n)
# limit experiment length
head = gr.head(58 * 2, self.packets)
tb.connect(reshape_n, head)
# modulate
gsm_burstmod = gsm.gsm_modulate_burst()
tb.connect(head, gsm_burstmod)
random_tsc_index = mlse.randint_b(8)
tb.connect(random_tsc_index, (gsm_burstmod, 1))
# apply channel
channel = gsm.my_channel(self.snr, self.chan_taps)
channel_apply = gsm.apply_channel_to_vect(148, channel, 3)
#TODO: don't use to_vector and to_stream for the channel
tb.connect(gsm_burstmod, channel_apply)
# derotate
derot = mlse.derotate_cc(148, 4,
-1) #FIXME: why -1? (not as if it matters)
tb.connect(channel_apply, derot)
# mlse-decode
if (self.no_decorr):
decode = gsm.gsm_decode_harddecision()
else:
decode = mlse.equalizer_midamble_vcb(mlse.make_packet_config_gsm())
tb.connect(random_tsc_index, (decode, 1))
tb.connect(derot, decode)
# ber
ber = mlse.ber_vbi(58 * 2)
tb.connect(decode, ber)
tb.connect(head, (ber, 1))
if (not self.no_decorr):
# throw away channel-estimate data
chanest_sink = gr.null_sink(6 * gr.sizeof_gr_complex)
tb.connect((decode, 1), chanest_sink)
# export members we need
self.tb = tb
self.ber = ber
self.head = head
self.channel = channel
def make_flowgraph(self):
tb = gr.top_block()
# noise source
n = mlse.randint_b(2)
reshape_n = gr.stream_to_vector(1, 58*2)
tb.connect(n,reshape_n)
# limit experiment length
head=gr.head(58*2,self.packets)
tb.connect(reshape_n, head)
# modulate
gsm_burstmod = gsm.gsm_modulate_burst()
tb.connect(head, gsm_burstmod)
random_tsc_index = mlse.randint_b(8);
tb.connect(random_tsc_index, (gsm_burstmod,1))
# apply channel
channel = gsm.my_channel(self.snr, self.chan_taps)
channel_apply = gsm.apply_channel_to_vect(148, channel, 3)
#TODO: don't use to_vector and to_stream for the channel
tb.connect(gsm_burstmod, channel_apply)
# derotate
derot = mlse.derotate_cc(148,4,-1) #FIXME: why -1? (not as if it matters)
tb.connect(channel_apply, derot)
# mlse-decode
if(self.no_decorr):
decode = gsm.gsm_decode_harddecision()
else:
decode = mlse.equalizer_midamble_vcb(mlse.make_packet_config_gsm())
tb.connect(random_tsc_index, (decode,1))
tb.connect(derot,decode)
# ber
ber = mlse.ber_vbi(58*2)
tb.connect(decode, ber)
tb.connect(head, (ber,1))
if(not self.no_decorr):
# throw away channel-estimate data
chanest_sink = gr.null_sink(6*gr.sizeof_gr_complex)
tb.connect((decode,1), chanest_sink)
# export members we need
self.tb = tb
self.ber = ber
self.head = head
self.channel = channel
def __init__(self):
gr.hier_block2.__init__(self, 'gsm_decode_harddecision',
gr.io_signature(1, 1, gr.sizeof_gr_complex * 148 ),
gr.io_signature(1,1,58*2))
conf = mlse.make_packet_config_gsm()
slice1 = conf.make_slicer(conf.PAYLOAD_FRONT)
slice2 = conf.make_slicer(conf.PAYLOAD_REAR)
cat = mlse.vector_concat_vv(58*gr.sizeof_gr_complex, 58*gr.sizeof_gr_complex)
tostream = gr.vector_to_stream(gr.sizeof_gr_complex, 58*2)
real = gr.complex_to_real()
sign = gr.binary_slicer_fb()
demap = gr.map_bb([1,0]) # invert 0 and 1 because in gsm 0 is mapped to +1 and 1 to -1
tovect = gr.stream_to_vector(1, 58*2)
self.connect(self, slice1)
self.connect(self, slice2)
self.connect(slice1, (cat,0))
self.connect(slice2, (cat,1))
self.connect(cat, tostream, real, sign, demap, tovect, self)
def test_viterbi():
tb=gr.top_block()
channel = [0,1,0]
prellen = len(channel) - 1
data = [random.randint(0,1) for i in xrange(20+prellen)]
data.extend([0,0,0]) # tailbits
data.extend([0]*6) # to flush modulator
# modulate
datasrc = gr.vector_source_b(data)
diffcode = mlse.xor_encode_bb();
nrz = gr.map_bb([1,-1])
mod = gr.gmskmod_bc(1, 0.3, 12)
derot = mlse.derotate_cc();
modsink = gr.vector_sink_c();
tb.connect(datasrc, diffcode, nrz, mod, derot, modsink)
tb.run()
samples = modsink.data()[6:]
printvect_c(samples)
preload = data[:prellen]
rest = data[prellen:][:20]
tb=gr.top_block()
conf=mlse.make_packet_config_gsm()
vit = mlse.viterbi_vcb(20,len(channel),3,[1,-1])#conf.get_constellation())
chansrc = gr.vector_source_c(channel,vlen=len(channel))
preloadsrc = gr.vector_source_b(preload,vlen=len(preload))
samplesrc = gr.vector_source_c(samples,vlen=len(samples))
sink = gr.vector_sink_b(20)
tb.connect(chansrc, (vit,0))
tb.connect(samplesrc, (vit,1))
tb.connect(preloadsrc, (vit,2))
tb.connect(vit, sink)
tb.run()
print_bitvect(preload)
print_bitvect(rest)
print_bitvect(sink.data())
def test_viterbi():
tb = gr.top_block()
channel = [0, 1, 0]
prellen = len(channel) - 1
data = [random.randint(0, 1) for i in xrange(20 + prellen)]
data.extend([0, 0, 0]) # tailbits
data.extend([0] * 6) # to flush modulator
# modulate
datasrc = gr.vector_source_b(data)
diffcode = mlse.xor_encode_bb()
nrz = gr.map_bb([1, -1])
mod = gr.gmskmod_bc(1, 0.3, 12)
derot = mlse.derotate_cc()
modsink = gr.vector_sink_c()
tb.connect(datasrc, diffcode, nrz, mod, derot, modsink)
tb.run()
samples = modsink.data()[6:]
printvect_c(samples)
preload = data[:prellen]
rest = data[prellen:][:20]
tb = gr.top_block()
conf = mlse.make_packet_config_gsm()
vit = mlse.viterbi_vcb(20, len(channel), 3,
[1, -1]) #conf.get_constellation())
chansrc = gr.vector_source_c(channel, vlen=len(channel))
preloadsrc = gr.vector_source_b(preload, vlen=len(preload))
samplesrc = gr.vector_source_c(samples, vlen=len(samples))
sink = gr.vector_sink_b(20)
tb.connect(chansrc, (vit, 0))
tb.connect(samplesrc, (vit, 1))
tb.connect(preloadsrc, (vit, 2))
tb.connect(vit, sink)
tb.run()
print_bitvect(preload)
print_bitvect(rest)
print_bitvect(sink.data())
def __init__(self, samples_per_symbol=1):
gr.hier_block2.__init__(self, 'gsm_modulate_burst',
gr.io_signature2(2, 2, 58 * 2, 1),
gr.io_signature(1, 1, gr.sizeof_gr_complex))
# take care of the packetizer
conf = mlse.make_packet_config_gsm()
self.packetbuilder = mlse.packetbuilder_midamble_vbb(conf)
self.connect(self, self.packetbuilder)
self.connect((self, 1), (self.packetbuilder, 1)) # tsc_index
# append 8 1-bits to the packet for the idle-time between bursts.
# This is necessary among others to flush the gmsk-modulator which is causal.
# (We use 1-bits because that's what the gsm-standard says)
# (we also only use 8 bits, because the specified value of 8.25 only works
# properly with samplerates that are a multiple of 4.)
self.guardbits = gr.vector_source_b((1, ) * 8, True, 8)
self.guard_cat = mlse.vector_concat_vv(148, 8)
self.connect(self.packetbuilder, self.guard_cat)
self.connect(self.guardbits, (self.guard_cat, 1))
# we now have a vector of bits, transform that into a stream
self.tostream = gr.vector_to_stream(1, 148 + 8)
# do the precoding:
self.diffcode = gr.diff_decoder_bb(2)
self.nrz = gr.map_bb([1, -1])
self.connect(self.guard_cat, self.tostream, self.diffcode, self.nrz)
# modulate
self.mod = digital.gmskmod_bc(samples_per_symbol, 0.3, 8)
# skip the first gmsk_length*samplerate/2 samples to make this block
# acausal.
# self.skiphead = gr.skiphead(gr.sizeof_gr_complex, int(samples_per_symbol*4.5));
# self.connect(self.nrz, self.mod, self.skiphead, self)
self.connect(self.nrz, self.mod,
self) # workaround: we need a negative delay later,
def __init__(self):
gr.hier_block2.__init__(
self, 'gsm_decode_harddecision',
gr.io_signature(1, 1, gr.sizeof_gr_complex * 148),
gr.io_signature(1, 1, 58 * 2))
conf = mlse.make_packet_config_gsm()
slice1 = conf.make_slicer(conf.PAYLOAD_FRONT)
slice2 = conf.make_slicer(conf.PAYLOAD_REAR)
cat = mlse.vector_concat_vv(58 * gr.sizeof_gr_complex,
58 * gr.sizeof_gr_complex)
tostream = gr.vector_to_stream(gr.sizeof_gr_complex, 58 * 2)
real = gr.complex_to_real()
sign = gr.binary_slicer_fb()
demap = gr.map_bb(
[1,
0]) # invert 0 and 1 because in gsm 0 is mapped to +1 and 1 to -1
tovect = gr.stream_to_vector(1, 58 * 2)
self.connect(self, slice1)
self.connect(self, slice2)
self.connect(slice1, (cat, 0))
self.connect(slice2, (cat, 1))
self.connect(cat, tostream, real, sign, demap, tovect, self)
def __init__(self, samples_per_symbol = 1):
gr.hier_block2.__init__(self, 'gsm_modulate_burst',
gr.io_signature2(2,2,58*2,1),
gr.io_signature(1, 1, gr.sizeof_gr_complex))
# take care of the packetizer
conf = mlse.make_packet_config_gsm()
self.packetbuilder = mlse.packetbuilder_midamble_vbb(conf)
self.connect(self, self.packetbuilder)
self.connect((self,1), (self.packetbuilder,1)) # tsc_index
# append 8 1-bits to the packet for the idle-time between bursts.
# This is necessary among others to flush the gmsk-modulator which is causal.
# (We use 1-bits because that's what the gsm-standard says)
# (we also only use 8 bits, because the specified value of 8.25 only works
# properly with samplerates that are a multiple of 4.)
self.guardbits = gr.vector_source_b((1,)*8,True,8)
self.guard_cat = mlse.vector_concat_vv(148,8)
self.connect(self.packetbuilder, self.guard_cat)
self.connect(self.guardbits, (self.guard_cat,1))
# we now have a vector of bits, transform that into a stream
self.tostream = gr.vector_to_stream(1, 148+8)
# do the precoding:
self.diffcode = gr.diff_decoder_bb(2);
self.nrz = gr.map_bb([1,-1])
self.connect(self.guard_cat, self.tostream, self.diffcode, self.nrz)
# modulate
self.mod = digital.gmskmod_bc(samples_per_symbol, 0.3, 8)
# skip the first gmsk_length*samplerate/2 samples to make this block
# acausal.
# self.skiphead = gr.skiphead(gr.sizeof_gr_complex, int(samples_per_symbol*4.5));
# self.connect(self.nrz, self.mod, self.skiphead, self)
self.connect(self.nrz, self.mod, self) # workaround: we need a negative delay later,
