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annotate src/cs/layer1/gtt_include/ctm/init_interleaver.h @ 61:935692f51b38

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src/g23m-gsm/alr2/alr.h: removed bogus extern to pass gcc compilation
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 19 Jul 2018 23:30:08 +0000
parents b6a5e36de839
children
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1 /*
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2 *******************************************************************************
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3 *
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4 * COPYRIGHT (C) 2000 BY ERICSSON EUROLAB DEUTSCHLAND GmbH
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5 * 90411 NUERNBERG, GERMANY, Tel Int + 49 911 5217 100
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6 *
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7 * The program(s) may be used and/or copied only with the
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8 * written permission from Ericsson or in accordance
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9 * with the terms and conditions stipulated in the agreement or
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10 * contract under which the program(s) have been supplied.
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11 *
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12 *******************************************************************************
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13 *
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14 * File : init_interleaver.h
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15 * Purpose : initialization of the diagonal (chain) interleaver;
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16 * definition of the type interleaver_state_t
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17 *
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18 *******************************************************************************
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19 */
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20 #ifndef init_interleaver_h
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21 #define init_interleaver_h "$Id: $"
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22
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23 /*
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24 *******************************************************************************
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25 * INCLUDE FILES
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26 *******************************************************************************
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27 */
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28
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29 #include "ctm_typedefs.h"
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30
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31 /*
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32 *******************************************************************************
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33 * DECLARATION OF PROTOTYPES
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34 *******************************************************************************
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35 */
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36 #if (TTY_SYNC_MCU == 1)
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37 #define RESYNC_OFFSET 384
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38 #endif
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39
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40 /* --------------------------------------------------------------------- */
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41 /* interleaver_state_t: */
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42 /* type definition for storing the states of the diag_interleaver and */
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43 /* diag_deinterleaver, respectively (each instance of */
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44 /* interleavers/deinterleavers must have its own variable of this type */
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45 /* --------------------------------------------------------------------- */
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46
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47 typedef struct {
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48 WORD16 B, D; /* dimensions of the (de)interleaver */
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49 WORD16 rows; /* Number of rows in buffer */
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50 WORD16 clmn; /* actual index within the (de)interleaver matrix */
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51 WORD16 ready; /* Number of ready rows in (de)interleaver */
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52 WORD16 *vector; /* memory of the (de)interleaver */
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53 WORD16 num_sync_lines1;/* number of preceding lines in the interl. matrix*/
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54 WORD16 num_sync_lines2;/* number of preceding lines in the interl. matrix*/
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55 WORD16 num_sync_bits; /* number of sync bits (demodulator sync) */
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56 WORD16 *sync_index_vec;/* indices of the bits for deintl. synchronization*/
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57 WORD16 *scramble_vec; /* sequence for scrambling */
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58 WORD16 *sequence; /* m-sequence for synchronisation */
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59
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60 } interleaver_state_t;
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61
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62
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63 /* --------------------------------------------------------------------- */
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64 /* init_interleaver: */
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65 /* function for initialization of diag_interleaver and */
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66 /* diag_deinterleaver, respectively. The dimensions of the interleaver */
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67 /* must be specified: */
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68 /* B = (horizontal) blocklength, D = (vertical distance) */
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69 /* According to this specifications, this function initializes a */
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70 /* variable of type interleaver_state_t. */
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71 /* */
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72 /* Additionally, this function adds two types of sync information to the */
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73 /* bitstream. The first sync info is for the demodulator and consists */
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74 /* of a sequence of alternating bits so that the tones produced by the */
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75 /* modulator are not the same all the time. This is essential for the */
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76 /* demodulator to find the transitions between adjacent bits. The bits */
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77 /* for this demodulator synchronization simply precede the bitstream. */
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78 /* A good choice for this is e.g. num_sync_lines1=2, which results in */
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79 /* 14 additional bits in case of the (B=7, D=2) interleaver. */
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80 /* */
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81 /* The second sync info is for synchronizing the deinterleaver and */
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82 /* of a m-sequence with excellent autocorrelation properties. These bits */
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83 /* are positioned at the locations of the dummy bits, which are not used */
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84 /* by the interleaver. In addition, even more bits for this */
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85 /* can be spent by inserting additional sync bits, which precede the */
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86 /* interleaver's bitstream. This is indicated by chosing */
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87 /* num_sync_lines2>0. */
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88 /* */
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89 /* Example: (B=7, D=2)-interleaver, */
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90 /* num_sync_lines1=2 (demodulator sync bits are marked by 'd') */
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91 /* num_sync_lines2=1 (deinterleaver sync bits are marked by 'x')*/
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92 /* */
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93 /* d d d d d d d */
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94 /* d d d d d d d */
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95 /* x x x x x x x */
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96 /* 1 x x x x x x */
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97 /* 8 x x x x x x */
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98 /* 15 2 x x x x x */
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99 /* 22 9 x x x x x */
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100 /* 29 16 3 x x x x */
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101 /* 36 23 10 x x x x */
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102 /* 43 30 17 4 x x x */
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103 /* 50 37 24 11 x x x */
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104 /* 57 44 31 18 5 x x */
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105 /* 64 51 38 25 12 x x */
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106 /* 71 58 45 32 19 6 x */
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107 /* 78 65 52 39 26 13 x */
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108 /* 85 72 59 46 33 20 7 */
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109 /* 92 79 66 53 40 27 14 */
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110 /* 99 86 73 60 47 34 21 */
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111 /* --------------------------------------------------------------------- */
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112
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113 void init_interleaver(interleaver_state_t *intl_state,
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114 WORD16 B, WORD16 D,
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115 WORD16 num_sync_lines1, WORD16 num_sync_lines2);
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116 /*
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117 ***********************************************************************
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118 * Shutdown_interleaver() *
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119 * ********************* *
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120 * Deallocate dyamically created buffers. *
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121 * *
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122 * Input variables: *
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123 * intl_state : pointer to a variable of interleaver_state_t *
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124 * containing the interleaver state machine. *
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125 ***********************************************************************
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126 */
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127 void Shutdown_interleaver(interleaver_state_t *intl_state);
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128
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129 /* --------------------------------------------------------------------- */
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130 /* reinit_interleaver: */
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131 /* Same as init_interleaver() but without new allocation of buffers. */
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132 /* This function shall be used for initiation each new burst. */
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133 /* --------------------------------------------------------------------- */
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134
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135 void reinit_interleaver(interleaver_state_t *intl_state);
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136
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137
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138 void init_deinterleaver(interleaver_state_t *intl_state,
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139 WORD16 B, WORD16 D);
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140
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141 /*
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142 ***********************************************************************
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143 * Shutdown_deinterleaver() *
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144 * ************************ *
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145 * Deallocate dyamically created buffers. *
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146 * *
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147 * Input variables: *
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148 * intl_state : pointer to a variable of interleaver_state_t *
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149 * containing the deinterleaver state machine. *
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150 ***********************************************************************
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151 */
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152 void Shutdown_deinterleaver(interleaver_state_t *intl_state);
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153
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154 void reinit_deinterleaver(interleaver_state_t *intl_state);
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155
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156 /* --------------------------------------------------------------------- */
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157 /* calc_mute_positions: */
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158 /* Calculation of the indices of the bits that have to be muted within */
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159 /* one burst. The indices are returned in the vector mute_positions. */
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160 /* --------------------------------------------------------------------- */
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161
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162 void calc_mute_positions(WORD16 *mute_positions,
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163 WORD16 num_rows_to_mute,
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164 WORD16 start_position,
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165 WORD16 B,
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166 WORD16 D);
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167
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168 BOOL mutingRequired(WORD16 actualIndex,
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169 WORD16 *mute_positions,
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170 WORD16 length_mute_positions);
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171
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172 /* --------------------------------------------------------------------- */
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173 /* generate_scrambling_sequence: */
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174 /* Generation of the sequence used for scrambling. The sequence consists */
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175 /* of 0 and 1 elements. The sequence is stored into the vector *sequence */
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176 /* and the length of the sequence is specified by the variable length. */
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177 /* --------------------------------------------------------------------- */
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178
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179 void generate_scrambling_sequence(WORD16 *sequence, WORD16 length);
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180
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181 #endif
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182
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183
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184