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authorJosh Morman <jmorman@gnuradio.org>2021-11-24 12:40:24 -0500
committermormj <34754695+mormj@users.noreply.github.com>2021-11-24 14:41:53 -0500
commitde184bd22f98b714bc2f383d59126cd2510374fe (patch)
tree87dfc815886175fa59cbb3d6f88978616d810d01 /gr-trellis/examples/python
parent8ab3e5a686f89ae7711cec9496cdc6598a4ad80b (diff)
trellis: pep8 formatting
Signed-off-by: Josh Morman <jmorman@gnuradio.org>
Diffstat (limited to 'gr-trellis/examples/python')
-rw-r--r--gr-trellis/examples/python/test_tcm.py134
1 files changed, 73 insertions, 61 deletions
diff --git a/gr-trellis/examples/python/test_tcm.py b/gr-trellis/examples/python/test_tcm.py
index 958a4b5c64..c747b5b13c 100644
--- a/gr-trellis/examples/python/test_tcm.py
+++ b/gr-trellis/examples/python/test_tcm.py
@@ -17,108 +17,120 @@ except ImportError:
sys.stderr.write("Error: Program requires gr-analog.\n")
sys.exit(1)
-def run_test (f,Kb,bitspersymbol,K,dimensionality,constellation,N0,seed):
- tb = gr.top_block ()
+
+def run_test(f, Kb, bitspersymbol, K, dimensionality, constellation, N0, seed):
+ tb = gr.top_block()
# TX
numpy.random.seed(-seed)
- packet = numpy.random.randint(0,2,Kb) # create Kb random bits
- packet[Kb-10:Kb]=0
- packet[0:Kb]=0
- src = blocks.vector_source_s(packet.tolist(),False)
- b2s = blocks.unpacked_to_packed_ss(1,gr.GR_MSB_FIRST) # pack bits in shorts
- s2fsmi = blocks.packed_to_unpacked_ss(bitspersymbol,gr.GR_MSB_FIRST) # unpack shorts to symbols compatible with the FSM input cardinality
- enc = trellis.encoder_ss(f,0) # initial state = 0
- mod = digital.chunks_to_symbols_sf(constellation,dimensionality)
+ packet = numpy.random.randint(0, 2, Kb) # create Kb random bits
+ packet[Kb - 10:Kb] = 0
+ packet[0:Kb] = 0
+ src = blocks.vector_source_s(packet.tolist(), False)
+ b2s = blocks.unpacked_to_packed_ss(
+ 1, gr.GR_MSB_FIRST) # pack bits in shorts
+ # unpack shorts to symbols compatible with the FSM input cardinality
+ s2fsmi = blocks.packed_to_unpacked_ss(bitspersymbol, gr.GR_MSB_FIRST)
+ enc = trellis.encoder_ss(f, 0) # initial state = 0
+ mod = digital.chunks_to_symbols_sf(constellation, dimensionality)
# CHANNEL
add = blocks.add_ff()
- noise = analog.noise_source_f(analog.GR_GAUSSIAN,math.sqrt(N0 / 2),int(seed))
+ noise = analog.noise_source_f(
+ analog.GR_GAUSSIAN, math.sqrt(N0 / 2), int(seed))
# RX
- va = trellis.viterbi_combined_fs(f,K,0,0,dimensionality,constellation,digital.TRELLIS_EUCLIDEAN) # Put -1 if the Initial/Final states are not set.
- fsmi2s = blocks.unpacked_to_packed_ss(bitspersymbol,gr.GR_MSB_FIRST) # pack FSM input symbols to shorts
- s2b = blocks.packed_to_unpacked_ss(1,gr.GR_MSB_FIRST) # unpack shorts to bits
- dst = blocks.vector_sink_s();
-
-
- tb.connect (src,b2s,s2fsmi,enc,mod)
- tb.connect (mod,(add,0))
- tb.connect (noise,(add,1))
- tb.connect (add,va,fsmi2s,s2b,dst)
-
+ # Put -1 if the Initial/Final states are not set.
+ va = trellis.viterbi_combined_fs(
+ f, K, 0, 0, dimensionality, constellation, digital.TRELLIS_EUCLIDEAN)
+ fsmi2s = blocks.unpacked_to_packed_ss(
+ bitspersymbol, gr.GR_MSB_FIRST) # pack FSM input symbols to shorts
+ s2b = blocks.packed_to_unpacked_ss(
+ 1, gr.GR_MSB_FIRST) # unpack shorts to bits
+ dst = blocks.vector_sink_s()
+
+ tb.connect(src, b2s, s2fsmi, enc, mod)
+ tb.connect(mod, (add, 0))
+ tb.connect(noise, (add, 1))
+ tb.connect(add, va, fsmi2s, s2b, dst)
tb.run()
# A bit of cheating: run the program once and print the
# final encoder state..
# Then put it as the last argument in the viterbi block
- #print "final state = " , enc.ST()
+ # print "final state = " , enc.ST()
if len(dst.data()) != len(packet):
print("Error: not enough data:", len(dst.data()), len(packet))
- ntotal=len(packet)
- nwrong = sum(abs(packet-numpy.array(dst.data())));
- return (ntotal,nwrong,abs(packet-numpy.array(dst.data())))
-
-
+ ntotal = len(packet)
+ nwrong = sum(abs(packet - numpy.array(dst.data())))
+ return (ntotal, nwrong, abs(packet - numpy.array(dst.data())))
def main():
parser = OptionParser(option_class=eng_option)
- parser.add_option("-f", "--fsm_file", type="string", default="fsm_files/awgn1o2_4.fsm", help="Filename containing the fsm specification, e.g. -f fsm_files/awgn1o2_4.fsm (default=fsm_files/awgn1o2_4.fsm)")
- parser.add_option("-e", "--esn0", type="eng_float", default=10.0, help="Symbol energy to noise PSD level ratio in dB, e.g., -e 10.0 (default=10.0)")
- parser.add_option("-r", "--repetitions", type="int", default=100, help="Number of packets to be generated for the simulation, e.g., -r 100 (default=100)")
-
- (options, args) = parser.parse_args ()
+ parser.add_option("-f", "--fsm_file", type="string", default="fsm_files/awgn1o2_4.fsm",
+ help="Filename containing the fsm specification, e.g. -f fsm_files/awgn1o2_4.fsm (default=fsm_files/awgn1o2_4.fsm)")
+ parser.add_option("-e", "--esn0", type="eng_float", default=10.0,
+ help="Symbol energy to noise PSD level ratio in dB, e.g., -e 10.0 (default=10.0)")
+ parser.add_option("-r", "--repetitions", type="int", default=100,
+ help="Number of packets to be generated for the simulation, e.g., -r 100 (default=100)")
+
+ (options, args) = parser.parse_args()
if len(args) != 0:
parser.print_help()
raise SystemExit(1)
- fname=options.fsm_file
- esn0_db=float(options.esn0)
- rep=int(options.repetitions)
+ fname = options.fsm_file
+ esn0_db = float(options.esn0)
+ rep = int(options.repetitions)
# system parameters
- f=trellis.fsm(fname) # get the FSM specification from a file
+ f = trellis.fsm(fname) # get the FSM specification from a file
# alternatively you can specify the fsm from its generator matrix
- #f=trellis.fsm(1,2,[5,7])
- Kb=1024*16 # packet size in bits (make it multiple of 16 so it can be packed in a short)
- bitspersymbol = int(round(math.log(f.I()) / math.log(2))) # bits per FSM input symbol
- K=Kb / bitspersymbol # packet size in trellis steps
- modulation = fsm_utils.psk4 # see fsm_utlis.py for available predefined modulations
+ # f=trellis.fsm(1,2,[5,7])
+ # packet size in bits (make it multiple of 16 so it can be packed in a short)
+ Kb = 1024 * 16
+ # bits per FSM input symbol
+ bitspersymbol = int(round(math.log(f.I()) / math.log(2)))
+ K = Kb / bitspersymbol # packet size in trellis steps
+ modulation = fsm_utils.psk4 # see fsm_utlis.py for available predefined modulations
dimensionality = modulation[0]
constellation = modulation[1]
if len(constellation) / dimensionality != f.O():
- sys.stderr.write ('Incompatible FSM output cardinality and modulation size.\n')
- sys.exit (1)
+ sys.stderr.write(
+ 'Incompatible FSM output cardinality and modulation size.\n')
+ sys.exit(1)
# calculate average symbol energy
Es = 0
for i in range(len(constellation)):
Es = Es + constellation[i]**2
- Es = Es / (len(constellation)//dimensionality)
- N0=Es / pow(10.0,esn0_db/10.0); # calculate noise variance
+ Es = Es / (len(constellation) // dimensionality)
+ N0 = Es / pow(10.0, esn0_db / 10.0) # calculate noise variance
- tot_b=0 # total number of transmitted bits
- terr_b=0 # total number of bits in error
- terr_p=0 # total number of packets in error
+ tot_b = 0 # total number of transmitted bits
+ terr_b = 0 # total number of bits in error
+ terr_p = 0 # total number of packets in error
for i in range(rep):
- (b,e,pattern)=run_test(f,Kb,bitspersymbol,K,dimensionality,constellation,N0,-(666+i)) # run experiment with different seed to get different noise realizations
- tot_b=tot_b+b
- terr_b=terr_b+e
- terr_p=terr_p+(e!=0)
- if ((i+1)%100==0) : # display progress
- print(i+1,terr_p, '%.2e' % ((1.0*terr_p) / (i+1)),tot_b,terr_b, '%.2e' % ((1.0*terr_b) / tot_b))
- if e!=0:
- print("rep=",i, e)
+ # run experiment with different seed to get different noise realizations
+ (b, e, pattern) = run_test(f, Kb, bitspersymbol,
+ K, dimensionality, constellation, N0, -(666 + i))
+ tot_b = tot_b + b
+ terr_b = terr_b + e
+ terr_p = terr_p + (e != 0)
+ if ((i + 1) % 100 == 0): # display progress
+ print(i + 1, terr_p, '%.2e' % ((1.0 * terr_p) / (i + 1)),
+ tot_b, terr_b, '%.2e' % ((1.0 * terr_b) / tot_b))
+ if e != 0:
+ print("rep=", i, e)
for k in range(Kb):
- if pattern[k]!=0:
+ if pattern[k] != 0:
print(k)
# estimate of the bit error rate
- print(rep,terr_p, '%.2e' % ((1.0*terr_p) / (i+1)),tot_b,terr_b, '%.2e' % ((1.0*terr_b) / tot_b))
-
+ print(rep, terr_p, '%.2e' % ((1.0 * terr_p) / (i + 1)),
+ tot_b, terr_b, '%.2e' % ((1.0 * terr_b) / tot_b))
if __name__ == '__main__':
main()
-
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