GNU Radio's DAB Package
dab_correct_individual_phase_offset_vff.h
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1 /* -*- c++ -*- */
2 /*
3  * Copyright 2004 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.
11  *
12  * GNU Radio is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with GNU Radio; see the file COPYING. If not, write to
19  * the Free Software Foundation, Inc., 51 Franklin Street,
20  * Boston, MA 02110-1301, USA.
21  */
22 #ifndef INCLUDED_DAB_CORRECT_INDIVIDUAL_PHASE_OFFSET_VFF_H
23 #define INCLUDED_DAB_CORRECT_INDIVIDUAL_PHASE_OFFSET_VFF_H
24 
25 #include <gr_sync_block.h>
26 
28 
29 /*
30  * We use std::shared_ptr's instead of raw pointers for all access
31  * to gr_blocks (and many other data structures). The shared_ptr gets
32  * us transparent reference counting, which greatly simplifies storage
33  * management issues. This is especially helpful in our hybrid
34  * C++ / Python system.
35  *
36  * See http://www.boost.org/libs/smart_ptr/smart_ptr.htm
37  *
38  * As a convention, the _sptr suffix indicates a std::shared_ptr
39  */
40 typedef std::shared_ptr<dab_correct_individual_phase_offset_vff> dab_correct_individual_phase_offset_vff_sptr;
41 
42 /*!
43  * \brief Return a shared_ptr to a new instance of dab_correct_individual_phase_offset_vff.
44  *
45  * To avoid accidental use of raw pointers, dab_correct_individual_phase_offset_vff's
46  * constructor is private. dab_make_correct_individual_phase_offset_vff is the public
47  * interface for creating new instances.
48  */
49 dab_correct_individual_phase_offset_vff_sptr
50 dab_make_correct_individual_phase_offset_vff (unsigned int vlen, float alpha);
51 
52 /*!
53  * \brief Corrects the individual phase offset of each subcarrier by doing an estimation of the error.
54  * \ingroup DAB
55  *
56  * \param vlen length of the vector
57  * \param alpha adaptation speed fatcor: corr = (1-alpha)*corr + alpha*new_val)
58  *
59  * input: float vector stream with phase vectors of symbols
60  * output: float vector stream with corrected phases
61  *
62  * Note: This block only makes sense as long as the offset of the majority of
63  * the samples is smaller than pi/4
64  */
65 class dab_correct_individual_phase_offset_vff : public gr_sync_block
66 {
67  private:
68  // The friend declaration allows dab_make_correct_individual_phase_offset_vff to
69  // access the private constructor.
70 
71  friend dab_correct_individual_phase_offset_vff_sptr
72  dab_make_correct_individual_phase_offset_vff (unsigned int vlen, float alpha);
73 
74  dab_correct_individual_phase_offset_vff (unsigned int vlen, float alpha); // private constructor
75 
76  unsigned int d_vlen;
77  float d_alpha;
78  float * d_offset_estimation;
79  unsigned int d_debug;
80 
81  public:
83  int work (int noutput_items,
84  gr_vector_const_void_star &input_items,
85  gr_vector_void_star &output_items);
86 };
87 
88 #endif /* INCLUDED_DAB_CORRECT_INDIVIDUAL_PHASE_OFFSET_VFF_H */
Corrects the individual phase offset of each subcarrier by doing an estimation of the error.
Definition: dab_correct_individual_phase_offset_vff.h:66
friend dab_correct_individual_phase_offset_vff_sptr dab_make_correct_individual_phase_offset_vff(unsigned int vlen, float alpha)
Return a shared_ptr to a new instance of dab_correct_individual_phase_offset_vff.
int work(int noutput_items, gr_vector_const_void_star &input_items, gr_vector_void_star &output_items)
dab_correct_individual_phase_offset_vff_sptr dab_make_correct_individual_phase_offset_vff(unsigned int vlen, float alpha)
Return a shared_ptr to a new instance of dab_correct_individual_phase_offset_vff.