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Diffstat (limited to 'gr-trellis/doc/test_viterbi_equalization1.py.xml')
| -rw-r--r-- | gr-trellis/doc/test_viterbi_equalization1.py.xml | 105 |
1 files changed, 0 insertions, 105 deletions
diff --git a/gr-trellis/doc/test_viterbi_equalization1.py.xml b/gr-trellis/doc/test_viterbi_equalization1.py.xml deleted file mode 100644 index 27605870e..000000000 --- a/gr-trellis/doc/test_viterbi_equalization1.py.xml +++ /dev/null @@ -1,105 +0,0 @@ -<?xml version="1.0" encoding="ISO-8859-1"?> -<programlisting> - 1 #!/usr/bin/env python - 2 - 3 from gnuradio import gr - 4 from gnuradio import audio - 5 from gnuradio import trellis - 6 from gnuradio import eng_notation - 7 import math - 8 import sys - 9 import random - 10 import fsm_utils - 11 - 12 def run_test (f,Kb,bitspersymbol,K,channel,modulation,dimensionality,tot_constellation,N0,seed): - 13 tb = gr.top_block () - 14 L = len(channel) - 15 - 16 # TX - 17 # this for loop is TOO slow in python!!! - 18 packet = [0]*(K+2*L) - 19 random.seed(seed) - 20 for i in range(len(packet)): - 21 packet[i] = random.randint(0, 2**bitspersymbol - 1) # random symbols - 22 for i in range(L): # first/last L symbols set to 0 - 23 packet[i] = 0 - 24 packet[len(packet)-i-1] = 0 - 25 src = gr.vector_source_s(packet,False) - 26 mod = gr.chunks_to_symbols_sf(modulation[1],modulation[0]) - 27 - 28 # CHANNEL - 29 isi = gr.fir_filter_fff(1,channel) - 30 add = gr.add_ff() - 31 noise = gr.noise_source_f(gr.GR_GAUSSIAN,math.sqrt(N0/2),seed) - 32 - 33 # RX - 34 skip = gr.skiphead(gr.sizeof_float, L) # skip the first L samples since you know they are coming from the L zero symbols - 35 #metrics = trellis.metrics_f(f.O(),dimensionality,tot_constellation,trellis.TRELLIS_EUCLIDEAN) # data preprocessing to generate metrics for Viterbi - 36 #va = trellis.viterbi_s(f,K+L,0,0) # Put -1 if the Initial/Final states are not set. - 37 va = trellis.viterbi_combined_s(f,K+L,0,0,dimensionality,tot_constellation,trellis.TRELLIS_EUCLIDEAN) # using viterbi_combined_s instead of metrics_f/viterbi_s allows larger packet lengths because metrics_f is complaining for not being able to allocate large buffers. This is due to the large f.O() in this application... - 38 dst = gr.vector_sink_s() - 39 - 40 tb.connect (src,mod) - 41 tb.connect (mod,isi,(add,0)) - 42 tb.connect (noise,(add,1)) - 43 #tb.connect (add,metrics) - 44 #tb.connect (metrics,va,dst) - 45 tb.connect (add,skip,va,dst) - 46 - 47 tb.run() - 48 - 49 data = dst.data() - 50 ntotal = len(data) - L - 51 nright=0 - 52 for i in range(ntotal): - 53 if packet[i+L]==data[i]: - 54 nright=nright+1 - 55 #else: - 56 #print "Error in ", i - 57 - 58 return (ntotal,ntotal-nright) - 59 - 60 - 61 def main(args): - 62 nargs = len (args) - 63 if nargs == 2: - 64 esn0_db=float(args[0]) - 65 rep=int(args[1]) - 66 else: - 67 sys.stderr.write ('usage: test_viterbi_equalization1.py Es/No_db repetitions\n') - 68 sys.exit (1) - 69 - 70 # system parameters - 71 Kb=2048 # packet size in bits - 72 modulation = fsm_utils.pam4 # see fsm_utlis.py for available predefined modulations - 73 channel = fsm_utils.c_channel # see fsm_utlis.py for available predefined test channels - 74 f=trellis.fsm(len(modulation[1]),len(channel)) # generate the FSM automatically - 75 bitspersymbol = int(round(math.log(f.I())/math.log(2))) # bits per FSM input symbol - 76 K=Kb/bitspersymbol # packet size in trellis steps - 77 - 78 tot_channel = fsm_utils.make_isi_lookup(modulation,channel,True) # generate the lookup table (normalize energy to 1) - 79 dimensionality = tot_channel[0] - 80 tot_constellation = tot_channel[1] - 81 N0=pow(10.0,-esn0_db/10.0); # noise variance - 82 if len(tot_constellation)/dimensionality != f.O(): - 83 sys.stderr.write ('Incompatible FSM output cardinality and lookup table size.\n') - 84 sys.exit (1) - 85 - 86 tot_s=0 # total number of transmitted shorts - 87 terr_s=0 # total number of shorts in error - 88 terr_p=0 # total number of packets in error - 89 - 90 for i in range(rep): - 91 (s,e)=run_test(f,Kb,bitspersymbol,K,channel,modulation,dimensionality,tot_constellation,N0,-long(666+i)) # run experiment with different seed to get different data and noise realizations - 92 tot_s=tot_s+s - 93 terr_s=terr_s+e - 94 terr_p=terr_p+(terr_s!=0) - 95 if ((i+1)%100==0) : # display progress - 96 print i+1,terr_p, '%.2e' % ((1.0*terr_p)/(i+1)),tot_s,terr_s, '%.2e' % ((1.0*terr_s)/tot_s) - 97 # estimate of the (short or symbol) error rate - 98 print rep,terr_p, '%.2e' % ((1.0*terr_p)/(i+1)),tot_s,terr_s, '%.2e' % ((1.0*terr_s)/tot_s) - 99 -100 -101 if __name__ == '__main__': -102 main (sys.argv[1:]) -</programlisting> |