qa_correlate_access_code.py

这是用python语言写的一个数字广播的信号处理工具包。利用它

#!/usr/bin/env python
#
# Copyright 2006 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.
# 

from gnuradio import gr, gr_unittest
import math

default_access_code = '\xAC\xDD\xA4\xE2\xF2\x8C\x20\xFC'

def string_to_1_0_list(s):
    r = []
    for ch in s:
        x = ord(ch)
        for i in range(8):
            t = (x >> i) & 0x1
            r.append(t)

    return r

def to_1_0_string(L):
    return ''.join(map(lambda x: chr(x + ord('0')), L))

class test_correlate_access_code(gr_unittest.TestCase):

    def setUp(self):
        self.fg = gr.flow_graph()

    def tearDown(self):
        self.fg = None

    def test_001(self):
        pad = (0,) * 64
        #           0  0  0  1  0  0  0  1
        src_data = (1, 0, 1, 1, 1, 1, 0, 1, 1) + pad + (0,) * 7
        expected_result = pad + (1, 0, 1, 1, 3, 1, 0, 1, 1, 2) + (0,) * 6
        src = gr.vector_source_b (src_data)
        op = gr.correlate_access_code_bb("1011", 0)
        dst = gr.vector_sink_b ()
        self.fg.connect (src, op, dst)
        self.fg.run ()
        result_data = dst.data ()
        self.assertEqual (expected_result, result_data)


    def test_002(self):
        code = tuple(string_to_1_0_list(default_access_code))
        access_code = to_1_0_string(code)
        pad = (0,) * 64
        #print code
        #print access_code
        src_data = code + (1, 0, 1, 1) + pad
        expected_result = pad + code + (3, 0, 1, 1)
        src = gr.vector_source_b (src_data)
        op = gr.correlate_access_code_bb(access_code, 0)
        dst = gr.vector_sink_b ()
        self.fg.connect (src, op, dst)
        self.fg.run ()
        result_data = dst.data ()
        self.assertEqual (expected_result, result_data)
        
        

if __name__ == '__main__':
    gr_unittest.main ()