FreeCalypso > hg > fc-magnetite
annotate src/cs/layer1/gtt_include/ctm/init_interleaver.h @ 362:4c3d05866531
FCHG: beginning of the new version
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Fri, 29 Dec 2017 07:06:06 +0000 |
parents | 945cf7f506b2 |
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rev | line source |
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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 |