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comparison src/cs/layer1/gtt_include/ctm/init_interleaver.h @ 0:4e78acac3d88

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src/{condat,cs,gpf,nucleus}: import from Selenite
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 16 Oct 2020 06:23:26 +0000
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1 /*
2 *******************************************************************************
3 *
4 * COPYRIGHT (C) 2000 BY ERICSSON EUROLAB DEUTSCHLAND GmbH
5 * 90411 NUERNBERG, GERMANY, Tel Int + 49 911 5217 100
6 *
7 * The program(s) may be used and/or copied only with the
8 * written permission from Ericsson or in accordance
9 * with the terms and conditions stipulated in the agreement or
10 * contract under which the program(s) have been supplied.
11 *
12 *******************************************************************************
13 *
14 * File : init_interleaver.h
15 * Purpose : initialization of the diagonal (chain) interleaver;
16 * definition of the type interleaver_state_t
17 *
18 *******************************************************************************
19 */
20 #ifndef init_interleaver_h
21 #define init_interleaver_h "$Id: $"
22
23 /*
24 *******************************************************************************
25 * INCLUDE FILES
26 *******************************************************************************
27 */
28
29 #include "ctm_typedefs.h"
30
31 /*
32 *******************************************************************************
33 * DECLARATION OF PROTOTYPES
34 *******************************************************************************
35 */
36 #if (TTY_SYNC_MCU == 1)
37 #define RESYNC_OFFSET 384
38 #endif
39
40 /* --------------------------------------------------------------------- */
41 /* interleaver_state_t: */
42 /* type definition for storing the states of the diag_interleaver and */
43 /* diag_deinterleaver, respectively (each instance of */
44 /* interleavers/deinterleavers must have its own variable of this type */
45 /* --------------------------------------------------------------------- */
46
47 typedef struct {
48 WORD16 B, D; /* dimensions of the (de)interleaver */
49 WORD16 rows; /* Number of rows in buffer */
50 WORD16 clmn; /* actual index within the (de)interleaver matrix */
51 WORD16 ready; /* Number of ready rows in (de)interleaver */
52 WORD16 *vector; /* memory of the (de)interleaver */
53 WORD16 num_sync_lines1;/* number of preceding lines in the interl. matrix*/
54 WORD16 num_sync_lines2;/* number of preceding lines in the interl. matrix*/
55 WORD16 num_sync_bits; /* number of sync bits (demodulator sync) */
56 WORD16 *sync_index_vec;/* indices of the bits for deintl. synchronization*/
57 WORD16 *scramble_vec; /* sequence for scrambling */
58 WORD16 *sequence; /* m-sequence for synchronisation */
59
60 } interleaver_state_t;
61
62
63 /* --------------------------------------------------------------------- */
64 /* init_interleaver: */
65 /* function for initialization of diag_interleaver and */
66 /* diag_deinterleaver, respectively. The dimensions of the interleaver */
67 /* must be specified: */
68 /* B = (horizontal) blocklength, D = (vertical distance) */
69 /* According to this specifications, this function initializes a */
70 /* variable of type interleaver_state_t. */
71 /* */
72 /* Additionally, this function adds two types of sync information to the */
73 /* bitstream. The first sync info is for the demodulator and consists */
74 /* of a sequence of alternating bits so that the tones produced by the */
75 /* modulator are not the same all the time. This is essential for the */
76 /* demodulator to find the transitions between adjacent bits. The bits */
77 /* for this demodulator synchronization simply precede the bitstream. */
78 /* A good choice for this is e.g. num_sync_lines1=2, which results in */
79 /* 14 additional bits in case of the (B=7, D=2) interleaver. */
80 /* */
81 /* The second sync info is for synchronizing the deinterleaver and */
82 /* of a m-sequence with excellent autocorrelation properties. These bits */
83 /* are positioned at the locations of the dummy bits, which are not used */
84 /* by the interleaver. In addition, even more bits for this */
85 /* can be spent by inserting additional sync bits, which precede the */
86 /* interleaver's bitstream. This is indicated by chosing */
87 /* num_sync_lines2>0. */
88 /* */
89 /* Example: (B=7, D=2)-interleaver, */
90 /* num_sync_lines1=2 (demodulator sync bits are marked by 'd') */
91 /* num_sync_lines2=1 (deinterleaver sync bits are marked by 'x')*/
92 /* */
93 /* d d d d d d d */
94 /* d d d d d d d */
95 /* x x x x x x x */
96 /* 1 x x x x x x */
97 /* 8 x x x x x x */
98 /* 15 2 x x x x x */
99 /* 22 9 x x x x x */
100 /* 29 16 3 x x x x */
101 /* 36 23 10 x x x x */
102 /* 43 30 17 4 x x x */
103 /* 50 37 24 11 x x x */
104 /* 57 44 31 18 5 x x */
105 /* 64 51 38 25 12 x x */
106 /* 71 58 45 32 19 6 x */
107 /* 78 65 52 39 26 13 x */
108 /* 85 72 59 46 33 20 7 */
109 /* 92 79 66 53 40 27 14 */
110 /* 99 86 73 60 47 34 21 */
111 /* --------------------------------------------------------------------- */
112
113 void init_interleaver(interleaver_state_t *intl_state,
114 WORD16 B, WORD16 D,
115 WORD16 num_sync_lines1, WORD16 num_sync_lines2);
116 /*
117 ***********************************************************************
118 * Shutdown_interleaver() *
119 * ********************* *
120 * Deallocate dyamically created buffers. *
121 * *
122 * Input variables: *
123 * intl_state : pointer to a variable of interleaver_state_t *
124 * containing the interleaver state machine. *
125 ***********************************************************************
126 */
127 void Shutdown_interleaver(interleaver_state_t *intl_state);
128
129 /* --------------------------------------------------------------------- */
130 /* reinit_interleaver: */
131 /* Same as init_interleaver() but without new allocation of buffers. */
132 /* This function shall be used for initiation each new burst. */
133 /* --------------------------------------------------------------------- */
134
135 void reinit_interleaver(interleaver_state_t *intl_state);
136
137
138 void init_deinterleaver(interleaver_state_t *intl_state,
139 WORD16 B, WORD16 D);
140
141 /*
142 ***********************************************************************
143 * Shutdown_deinterleaver() *
144 * ************************ *
145 * Deallocate dyamically created buffers. *
146 * *
147 * Input variables: *
148 * intl_state : pointer to a variable of interleaver_state_t *
149 * containing the deinterleaver state machine. *
150 ***********************************************************************
151 */
152 void Shutdown_deinterleaver(interleaver_state_t *intl_state);
153
154 void reinit_deinterleaver(interleaver_state_t *intl_state);
155
156 /* --------------------------------------------------------------------- */
157 /* calc_mute_positions: */
158 /* Calculation of the indices of the bits that have to be muted within */
159 /* one burst. The indices are returned in the vector mute_positions. */
160 /* --------------------------------------------------------------------- */
161
162 void calc_mute_positions(WORD16 *mute_positions,
163 WORD16 num_rows_to_mute,
164 WORD16 start_position,
165 WORD16 B,
166 WORD16 D);
167
168 BOOL mutingRequired(WORD16 actualIndex,
169 WORD16 *mute_positions,
170 WORD16 length_mute_positions);
171
172 /* --------------------------------------------------------------------- */
173 /* generate_scrambling_sequence: */
174 /* Generation of the sequence used for scrambling. The sequence consists */
175 /* of 0 and 1 elements. The sequence is stored into the vector *sequence */
176 /* and the length of the sequence is specified by the variable length. */
177 /* --------------------------------------------------------------------- */
178
179 void generate_scrambling_sequence(WORD16 *sequence, WORD16 length);
180
181 #endif
182
183
184