# transmit the samples, and retrieve samples back from the channel
try:
samples_rx = channel.xmit_and_recv(mod_samples)
except ZeroDivisionError:
# should only happen for audio channel
print "I didn't get any samples; is your microphone or speaker OFF?"
sys.exit(1)
#################################
# process the received samples
# make receiver
r = Receiver(fc, opt.samplerate, opt.spb)
demod_samples = r.demodulate(samples_rx)
one, zero, thresh = r.detect_threshold(demod_samples)
barker_start = r.detect_preamble(demod_samples, thresh, one)
rcdbits = r.demap_and_check(demod_samples, barker_start)
decoded_bits = r.decode(rcdbits)
# push into sink
sink = Sink()
rcd_payload = sink.process(decoded_bits)
if len(rcd_payload) > 0:
hd, err = common_srcsink.hamming(decoded_bits, databits)
print 'Hamming distance for payload at frequency', fc,'Hz:', hd, 'BER:', err
else:
print 'Could not recover transmission.'
if opt.graph:
len_mod = len(mod_samples) - opt.spb*opt.silence
len_demod = len_mod - opt.spb*(len(src_payload) - len(rcd_payload))
# transmit the samples, and retrieve samples back from the channel
try:
samples_rx = channel.xmit_and_recv(mod_samples)
except ZeroDivisionError:
# should only happen for audio channel
print "I didn't get any samples; is your microphone or speaker OFF?"
sys.exit(1)
#################################
# process the received samples
# make receiver
r = Receiver(fc, opt.samplerate, opt.spb)
demod_samples = r.demodulate(samples_rx)
one, zero, thresh = r.detect_threshold(demod_samples)
barker_start = r.detect_preamble(demod_samples, thresh, one)
rcdbits = r.demap_and_check(demod_samples, barker_start)
decoded_bits = r.decode(rcdbits)
# push into sink
sink = Sink()
rcd_payload = sink.process(databits)#sink.process(decoded_bits)
if len(rcd_payload) > 0:
hd, err = common_srcsink.hamming(decoded_bits, databits)
print 'Hamming distance for payload at frequency', fc,'Hz:', hd, 'BER:', err
else:
print 'Could not recover transmission.'
if opt.graph:
len_mod = len(mod_samples) - opt.spb*opt.silence
len_demod = len_mod - opt.spb*(len(src_payload) - len(rcd_payload))
