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annotate src/cs/layer1/gtt_include/ctm/init_interleaver.h @ 112:fdecfb3bd860

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.../drv_app/r2d/r2d_*.c: LCD include case fixes from Magnetite R2D is not used in Selenite, but we strive to keep the two source trees in sync as much as possible to reduce the diffs.
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 13 Oct 2018 16:56:22 +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