/usr/lib/python2.7/dist-packages/grc_gnuradio/blks2/error_rate.py is in gnuradio 3.7.11-10.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 | # Copyright 2008 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.
#
default_win_size = 1000
from gnuradio import gr
from gnuradio import blocks
import gnuradio.gr.gr_threading as _threading
import numpy
#generate 1s counts array
_1s_counts = [sum([1&(i>>j) for j in range(8)]) for i in range(2**8)]
class input_watcher(_threading.Thread):
"""
Read samples from the message queue and hand them to the callback.
"""
def __init__(self, msgq, callback):
self._msgq = msgq
self._callback = callback
_threading.Thread.__init__(self)
self.setDaemon(1)
self.keep_running = True
self.start()
def run(self):
r = ''
while True:
msg = self._msgq.delete_head()
itemsize = int(msg.arg1())
nitems = int(msg.arg2())
s = r + msg.to_string()
i = (nitems-nitems%2)*itemsize
r = s[i:]
s = s[:i]
samples = numpy.fromstring(s, numpy.int8)
self._callback(samples)
class error_rate(gr.hier_block2):
"""
Sample the incoming data streams (byte) and calculate the bit or symbol error rate.
Write the running rate to the output data stream (float).
"""
def __init__(self, type='BER', win_size=default_win_size, bits_per_symbol=2):
"""
Error rate constructor.
Args:
type: a string 'BER' or 'SER'
win_size: the number of samples to calculate over
bits_per_symbol: the number of information bits per symbol (BER only)
"""
#init
gr.hier_block2.__init__(
self, 'error_rate',
gr.io_signature(2, 2, gr.sizeof_char),
gr.io_signature(1, 1, gr.sizeof_float),
)
print "Warning: the blks2.error_rate is deprecated."
assert type in ('BER', 'SER')
self._max_samples = win_size
self._bits_per_symbol = bits_per_symbol
#setup message queue
msg_source = blocks.message_source(gr.sizeof_float, 1)
self._msgq_source = msg_source.msgq()
msgq_sink = gr.msg_queue(2)
msg_sink = blocks.message_sink(gr.sizeof_char, msgq_sink, False) #False -> blocking
inter = blocks.interleave(gr.sizeof_char)
#start thread
self._num_errs = 0
self._err_index = 0
self._num_samps = 0
self._err_array = numpy.zeros(self._max_samples, numpy.int8)
if type == 'BER':
input_watcher(msgq_sink, self._handler_ber)
elif type == 'SER':
input_watcher(msgq_sink, self._handler_ser)
#connect
self.connect(msg_source, self)
self.connect((self, 0), (inter, 0))
self.connect((self, 1), (inter, 1))
self.connect(inter, msg_sink)
def _handler_ber(self, samples):
num = len(samples)/2
arr = numpy.zeros(num, numpy.float32)
for i in range(num):
old_err = self._err_array[self._err_index]
#record error
self._err_array[self._err_index] = _1s_counts[samples[i*2] ^ samples[i*2 + 1]]
self._num_errs = self._num_errs + self._err_array[self._err_index] - old_err
#increment index
self._err_index = (self._err_index + 1)%self._max_samples
self._num_samps = min(self._num_samps + 1, self._max_samples)
#write sample
arr[i] = float(self._num_errs)/float(self._num_samps*self._bits_per_symbol)
#write message
msg = gr.message_from_string(arr.tostring(), 0, gr.sizeof_float, num)
self._msgq_source.insert_tail(msg)
def _handler_ser(self, samples):
num = len(samples)/2
arr = numpy.zeros(num, numpy.float32)
for i in range(num):
old_err = self._err_array[self._err_index]
#record error
ref = samples[i*2]
res = samples[i*2 + 1]
if ref == res:
self._err_array[self._err_index] = 0
else:
self._err_array[self._err_index] = 1
#update number of errors
self._num_errs = self._num_errs + self._err_array[self._err_index] - old_err
#increment index
self._err_index = (self._err_index + 1)%self._max_samples
self._num_samps = min(self._num_samps + 1, self._max_samples)
#write sample
arr[i] = float(self._num_errs)/float(self._num_samps)
#write message
msg = gr.message_from_string(arr.tostring(), 0, gr.sizeof_float, num)
self._msgq_source.insert_tail(msg)
|