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-rwxr-xr-xgr-trellis/src/examples/python/test_turbo_equalization.py6
1 files changed, 5 insertions, 1 deletions
diff --git a/gr-trellis/src/examples/python/test_turbo_equalization.py b/gr-trellis/src/examples/python/test_turbo_equalization.py
index 854344c30a..baddd7cb50 100755
--- a/gr-trellis/src/examples/python/test_turbo_equalization.py
+++ b/gr-trellis/src/examples/python/test_turbo_equalization.py
@@ -2,12 +2,16 @@
from gnuradio import gr
from gnuradio import trellis, digital
-from gnuradio import analog
from gnuradio import eng_notation
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 make_rx(tb,fo,fi,dimensionality,tot_constellation,K,interleaver,IT,Es,N0,type):
metrics_in = trellis.metrics_f(fi.O(),dimensionality,tot_constellation,digital.TRELLIS_EUCLIDEAN) # data preprocessing to generate metrics for innner SISO