diff options
Diffstat (limited to 'gr-digital/examples/berawgn.py')
| -rwxr-xr-x | gr-digital/examples/berawgn.py | 37 |
1 files changed, 34 insertions, 3 deletions
diff --git a/gr-digital/examples/berawgn.py b/gr-digital/examples/berawgn.py index d58dfbaaeb..2d95a1345f 100755 --- a/gr-digital/examples/berawgn.py +++ b/gr-digital/examples/berawgn.py @@ -1,4 +1,25 @@ #!/usr/bin/env python +# +# Copyright 2012 Free Software Foundation, Inc. +# +# This file is part of GNU Radio +# +# GNU Radio is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 3, or (at your option) +# any later version. +# +# GNU Radio is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with GNU Radio; see the file COPYING. If not, write to +# the Free Software Foundation, Inc., 51 Franklin Street, +# Boston, MA 02110-1301, USA. +# + """ BER simulation for QPSK signals, compare to theoretical values. Change the N_BITS value to simulate more bits per Eb/N0 value, @@ -14,10 +35,20 @@ magnitude below what you chose for N_BITS. import math import numpy -from scipy.special import erfc -import pylab from gnuradio import gr, digital +try: + from scipy.special import erfc +except ImportError: + print "Error: could not import scipy (http://www.scipy.org/)" + sys.exit(1) + +try: + import pylab +except ImportError: + print "Error: could not import pylab (http://matplotlib.sourceforge.net/)" + sys.exit(1) + # Best to choose powers of 10 N_BITS = 1e7 RAND_SEED = 42 @@ -59,7 +90,7 @@ class BERAWGNSimu(gr.top_block): # Source is N_BITS bits, non-repeated data = map(int, numpy.random.randint(0, self.const.arity(), N_BITS/self.const.bits_per_symbol())) src = gr.vector_source_b(data, False) - mod = gr.chunks_to_symbols_bc((self.const.points()), 1) + mod = digital.chunks_to_symbols_bc((self.const.points()), 1) add = gr.add_vcc() noise = gr.noise_source_c(gr.GR_GAUSSIAN, self.EbN0_to_noise_voltage(EbN0), |