GNU Radio 3.6.1 C++ API
digital_pn_correlator_cc.h
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1 /* -*- c++ -*- */
2 /*
3  * Copyright 2007,2012 Free Software Foundation, Inc.
4  *
5  * This file is part of GNU Radio
6  *
7  * GNU Radio is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 3, or (at your option)
10  * any later version.
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12  * GNU Radio is distributed in the hope that it will be useful,
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14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  * GNU General Public License for more details.
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18  * along with GNU Radio; see the file COPYING. If not, write to
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21  */
22 
23 #ifndef INCLUDED_GR_PN_CORRELATOR_CC_H
24 #define INCLUDED_GR_PN_CORRELATOR_CC_H
25 
26 #include <digital_api.h>
27 #include <gr_sync_decimator.h>
28 #include <gri_glfsr.h>
29 
32 
34 digital_make_pn_correlator_cc(int degree, int mask=0, int seed=1);
35 /*!
36  * \brief PN code sequential search correlator
37  *
38  * \ingroup sync_blk
39  *
40  * Receives complex baseband signal, outputs complex correlation
41  * against reference PN code, one sample per PN code period. The PN
42  * sequence is generated using a GLFSR.
43  *
44  * \param degree Degree of shift register must be in [1, 32]. If mask
45  * is 0, the degree determines a default mask (see
46  * digital_impl_glfsr.cc for the mapping).
47  * \param repeat Set to repeat sequence.
48  * \param mask Allows a user-defined bit mask for indexes of the shift
49  * register to feed back.
50  * \param seed Initial setting for values in shift register.
51  */
53 {
55  digital_make_pn_correlator_cc(int degree, int mask, int seed);
56 
57  int d_len;
58  float d_pn;
59  gri_glfsr *d_reference;
60 
61  protected:
62  digital_pn_correlator_cc(int degree, int mask, int seed);
63 
64  public:
65  virtual int work(int noutput_items,
66  gr_vector_const_void_star &input_items,
67  gr_vector_void_star &output_items);
68 
70 };
71 
72 #endif /* INCLUDED_GR_PN_CORRELATOR_CC_H */