diff options
Diffstat (limited to 'gr-trellis/doc/test_viterbi_equalization1.py.xml')
| -rw-r--r-- | gr-trellis/doc/test_viterbi_equalization1.py.xml | 36 |
1 files changed, 18 insertions, 18 deletions
diff --git a/gr-trellis/doc/test_viterbi_equalization1.py.xml b/gr-trellis/doc/test_viterbi_equalization1.py.xml index a97d04d6e..27605870e 100644 --- a/gr-trellis/doc/test_viterbi_equalization1.py.xml +++ b/gr-trellis/doc/test_viterbi_equalization1.py.xml @@ -1,7 +1,7 @@ <?xml version="1.0" encoding="ISO-8859-1"?> <programlisting> 1 #!/usr/bin/env python - 2 + 2 3 from gnuradio import gr 4 from gnuradio import audio 5 from gnuradio import trellis @@ -10,11 +10,11 @@ 8 import sys 9 import random 10 import fsm_utils - 11 + 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 + 15 16 # TX 17 # this for loop is TOO slow in python!!! 18 packet = [0]*(K+2*L) @@ -26,29 +26,29 @@ 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 + 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 + 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 + 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 + 46 47 tb.run() - 48 - 49 data = dst.data() + 48 + 49 data = dst.data() 50 ntotal = len(data) - L 51 nright=0 52 for i in range(ntotal): @@ -56,10 +56,10 @@ 54 nright=nright+1 55 #else: 56 #print "Error in ", i - 57 + 57 58 return (ntotal,ntotal-nright) - 59 - 60 + 59 + 60 61 def main(args): 62 nargs = len (args) 63 if nargs == 2: @@ -68,7 +68,7 @@ 66 else: 67 sys.stderr.write ('usage: test_viterbi_equalization1.py Es/No_db repetitions\n') 68 sys.exit (1) - 69 + 69 70 # system parameters 71 Kb=2048 # packet size in bits 72 modulation = fsm_utils.pam4 # see fsm_utlis.py for available predefined modulations @@ -76,7 +76,7 @@ 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 + 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] @@ -84,11 +84,11 @@ 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 + 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 + 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 @@ -98,8 +98,8 @@ 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 + 99 +100 101 if __name__ == '__main__': 102 main (sys.argv[1:]) </programlisting> |