mirror of
https://github.com/hb9fxq/gr-digitalhf
synced 2024-11-18 10:47:46 +00:00
54 lines
1.7 KiB
Python
54 lines
1.7 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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#
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# Copyright 2018 hcab14@mail.com.
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#
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# This is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3, or (at your option)
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# any later version.
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#
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# This software is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this software; see the file COPYING. If not, write to
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# the Free Software Foundation, Inc., 51 Franklin Street,
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# Boston, MA 02110-1301, USA.
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#
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import digitalhf.digitalhf_swig as digitalhf
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import random
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import pmt
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import numpy as np
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def main():
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v = digitalhf.viterbi27(0x6d, 0x4f)
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N = 35*500+5
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bits = [random.randint(0,1) for _ in range(N+7)]
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a = [1,0,1,1,0,1,1]
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b = [1,1,1,1,0,0,1]
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llr_encoded_bits = []
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for i in range(N):
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t1=t2=0
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for j in range(7):
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t1 += a[j]*bits[i+7-j]
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t2 += b[j]*bits[i+7-j]
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llr_encoded_bits.extend([7*(1-2*(t1%2)), 7*(1-2*(t2%2))])
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v.reset()
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llr_encoded_bits = np.array(llr_encoded_bits)
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llr_encoded_bits[3::6] = 0
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llr_encoded_bits[4::6] = 0
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decoded_bits = v.udpate(llr_encoded_bits)
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print(bits[7:37])
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print(decoded_bits[0:30])
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print('quality:', v.quality()*1.2/2/N)
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test = [all([decoded_bits[i] == bits[i+7] for i in range(N)]), abs(v.quality()*1.2-2*N)<1]
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print('test:', test)
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if not all(test):
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raise Exception(test)
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if __name__ == '__main__':
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main()
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