diff options
Diffstat (limited to 'gr-trellis/src/examples/python/test_viterbi_equalization.py')
| -rwxr-xr-x | gr-trellis/src/examples/python/test_viterbi_equalization.py | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/gr-trellis/src/examples/python/test_viterbi_equalization.py b/gr-trellis/src/examples/python/test_viterbi_equalization.py index 00d54620b2..91dc7e36da 100755 --- a/gr-trellis/src/examples/python/test_viterbi_equalization.py +++ b/gr-trellis/src/examples/python/test_viterbi_equalization.py @@ -7,6 +7,12 @@ import math import sys import fsm_utils +try: + from gnuradio import analog +except ImportError: + sys.stderr.write("Error: Program requires gr-analog.\n") + sys.exit(1) + def run_test (f,Kb,bitspersymbol,K,dimensionality,tot_constellation,N0,seed): tb = gr.top_block () @@ -20,7 +26,7 @@ def run_test (f,Kb,bitspersymbol,K,dimensionality,tot_constellation,N0,seed): # CHANNEL add = gr.add_ff() - noise = gr.noise_source_f(gr.GR_GAUSSIAN,math.sqrt(N0/2),seed) + noise = analog.noise_source_f(analog.GR_GAUSSIAN,math.sqrt(N0/2),seed) # RX metrics = trellis.metrics_f(f.O(),dimensionality,tot_constellation,digital.TRELLIS_EUCLIDEAN) # data preprocessing to generate metrics for Viterbi |