FreeCalypso > hg > fc-magnetite
annotate src/cs/layer1/gtt_include/ctm/wait_for_sync.h @ 118:9737224b10e1
r2d_drv_int_ram.lib compiles
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Thu, 06 Oct 2016 19:06:08 +0000 |
parents | 945cf7f506b2 |
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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 : wait_for_sync.h |
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15 * Purpose : synchronization routine for the deinterleaver |
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16 * |
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17 ******************************************************************************* |
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18 */ |
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19 #ifndef wait_for_sync_h |
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20 #define wait_for_sync_h "$Id: $" |
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21 |
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22 /* |
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23 ******************************************************************************* |
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24 * INCLUDE FILES |
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25 ******************************************************************************* |
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26 */ |
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27 |
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28 #include "ctm_typedefs.h" |
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29 |
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30 /* |
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31 ******************************************************************************* |
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32 * DECLARATION OF PROTOTYPES |
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33 ******************************************************************************* |
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34 */ |
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35 |
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36 typedef struct { |
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37 WORD16 *shift_reg; /* shift register */ |
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38 WORD16 *m_sequence; /* maximum length sequence (preamble) */ |
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39 WORD16 *m_sequence_resync; /* maximum length sequence (resync) */ |
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40 WORD16 *sync_index_vec; /* positions/indices of the preamble */ |
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41 WORD16 *resync_index_vec; /* positions/indices of the resync sequence */ |
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42 WORD16 length_shift_reg; /* length of the vector shift_reg */ |
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43 WORD16 offset; /* */ |
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44 WORD16 num_sync_bits; /* length of the preamble */ |
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45 BOOL sync_found; /* true if receiver is "in sync" */ |
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46 BOOL alreadyCTMreceived; /* true if burst has been received earlier */ |
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47 WORD16 *xcorr1_shiftreg; |
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48 WORD16 *xcorr2_shiftreg; |
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49 UWORD16 cntSymbolsSinceEndOfBurst; |
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50 } wait_for_sync_state_t; |
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51 |
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52 |
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53 |
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54 /* ----------------------------------------------------------------------- */ |
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55 /* Function init_wait_for_sync() */ |
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56 /* ***************************** */ |
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57 /* Initialization of the synchronization detector. The dimensions of the */ |
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58 /* corresponding interleaver at the TX side must be specified: */ |
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59 /* B (horizontal) blocklength */ |
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60 /* D (vertical) interlace factor */ |
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61 /* num_sync_lines2 number of interleaver lines with additional sync bits */ |
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62 /* ptr_wait_state pointer to the state variable of the sync detector */ |
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63 /* ----------------------------------------------------------------------- */ |
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64 |
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65 void init_wait_for_sync(wait_for_sync_state_t *ptr_wait_state, |
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66 WORD16 B, WORD16 D, |
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67 WORD16 num_sync_lines2); |
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68 |
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69 /* |
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70 *********************************************************************** |
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71 * Shutdown_wait_for_sync() * |
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72 * ************************ * |
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73 * Deallocate dyamically created buffers. * |
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74 * * |
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75 * Input variables: * |
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76 * intl_state : pointer to a variable of wait_for_sync_state_t * |
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77 * containing the wait_for_sync state machine. * |
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78 *********************************************************************** |
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79 */ |
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80 void Shutdown_wait_for_sync(wait_for_sync_state_t *ptr_wait_state); |
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81 |
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82 /* ----------------------------------------------------------------------- */ |
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83 /* Function reinit_wait_for_sync() */ |
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84 /* ******************************* */ |
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85 /* Reinitialization of synchronization detector. This function is used in */ |
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86 /* case that a burst has been finished and the transmitter has switched */ |
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87 /* into idle mode. After calling reinit_wait_for_sync(), the function */ |
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88 /* wait_for_sync() inhibits the transmission of the demodulated bits to */ |
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89 /* the deinterleaver, until the next synchronization sequence can be */ |
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90 /* detected. */ |
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91 /* ----------------------------------------------------------------------- */ |
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92 |
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93 void reinit_wait_for_sync(wait_for_sync_state_t *ptr_wait_state); |
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94 |
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95 |
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96 |
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97 /* ----------------------------------------------------------------------- */ |
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98 /* Function wait_for_sync() */ |
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99 /* ************************ */ |
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100 /* This function shall be inserted between the demodulator and the */ |
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101 /* deinterleaver. The function searches the synchronization bitstream */ |
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102 /* and cuts all received heading bits. As long as no sync is found, this */ |
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103 /* function returns *ptr_num_valid_out_bits=0 so that the main program */ |
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104 /* is able to skip the deinterleaver as long as no valid bits are */ |
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105 /* available. If the sync info is found, the complete internal shift */ |
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106 /* register is copied to out_bits so that wait_for_sync can be transparent */ |
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107 /* and causes no delay for future calls. */ |
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108 /* *ptr_wait_interval returns a value of 0 after such a synchronization */ |
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109 /* indicating that this was a regular synchronization. */ |
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110 /* */ |
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111 /* Regularly, the initial preamble of each burst is used as sync info. */ |
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112 /* In addition, the resynchronization sequences, which occur periodically */ |
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113 /* during a running burst, are used as "back-up" synchronization in order */ |
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114 /* to avoid loosing all characters of a burst, if the preamble was not */ |
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115 /* detected. */ |
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116 /* If the receiver is already synchronized on a running burst */ |
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117 /* and the resynchronization sequence is detected, *ptr_resync_detected */ |
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118 /* returns a non-negative value in the range 0...num_in_bits-1 indicating */ |
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119 /* at which bit the resynchronization sequence has been detected. If no */ |
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120 /* resynchronization has been detected, *ptr_resync_detected is -1. */ |
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121 /* If the receiver is NOT synchronized and the resynchronization sequence */ |
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122 /* is detected, the resynchronization sequence is used as initial */ |
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123 /* synchronization. *ptr_wait_interval returns a value of 32 in this case */ |
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124 /* due to the different alignments of the synchronizations based on the */ |
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125 /* preamble or the resynchronization sequence, respectively. */ |
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126 /* */ |
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127 /* In order to carry all bits, the minimum length of the vector out_bits */ |
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128 /* must be: */ |
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129 /* in_bits.size()-1 + ptr_wait_state->shift_reg_length */ |
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130 /* */ |
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131 /* in_bits Vector with bits from the demodulator. The */ |
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132 /* vector's length can be arbitrarily chosen, */ |
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133 /* i.e. according to the block length of the */ |
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134 /* signal processing of the main program. */ |
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135 /* num_in_bits length of vector in_bits */ |
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136 /* num_received_idle_symbols number of idle symbols received coherently */ |
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137 /* out_bits Vector with bits for the deinterleaver. */ |
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138 /* The number of the valid bits is indicated */ |
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139 /* by *ptr_num_valid_out_bits. */ |
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140 /* *ptr_num_valid_out_bits returns the number of valid output bits */ |
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141 /* *ptr_wait_interval returns either 0 or 32 */ |
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142 /* *ptr_resync_detected returns a value -1, 0,...num_in_bits */ |
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143 /* *ptr_early_muting_required returns whether the original audio signal */ |
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144 /* must not be forwarded. This is to guarantee */ |
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145 /* that the preamble or resync sequence is */ |
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146 /* detected only by the first CTM device, if */ |
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147 /* several CTM devices are cascaded */ |
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148 /* subsequently. */ |
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149 /* *ptr_wait_state state information. This variable must be */ |
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150 /* initialized with init_wait_for_sync() */ |
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151 /* ----------------------------------------------------------------------- */ |
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152 |
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153 #if(TTY_SYNC_MCU_2 == 0) |
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154 BOOL wait_for_sync(WORD16 *out_bits, |
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155 WORD16 *in_bits, |
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156 WORD16 num_in_bits, |
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157 WORD16 num_received_idle_symbols, |
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158 WORD16 *ptr_num_valid_out_bits, |
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159 WORD16 *ptr_wait_interval, |
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160 WORD16 *ptr_resync_detected, |
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161 BOOL *ptr_early_muting_required, |
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162 wait_for_sync_state_t *ptr_wait_state); |
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163 #else |
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164 BOOL wait_for_sync(WORD16 *out_bits, |
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165 WORD16 *in_bits, |
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166 WORD16 num_in_bits, |
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167 WORD16 num_received_idle_symbols, |
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168 WORD16 *ptr_num_valid_out_bits, |
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169 WORD16 *ptr_wait_interval, |
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170 WORD16 *ptr_resync_detected, |
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171 BOOL *ptr_early_muting_required, |
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172 wait_for_sync_state_t *ptr_wait_state, |
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173 BOOL *sync_after_resync); |
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174 #endif |
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175 |
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176 |
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177 |
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178 |
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179 /* ----------------------------------------------------------------------- */ |
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180 /* Function generate_resync_sequence() */ |
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181 /* *********************************** */ |
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182 /* Generation of the sequence for resynchronization. The sequence, which */ |
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183 /* has a length according to the value of the constant RESYNC_SEQ_LENGTH, */ |
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184 /* is written to the vector *sequence, which must have been allocated */ |
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185 /* before calling this function. */ |
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186 /* ----------------------------------------------------------------------- */ |
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187 |
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188 void generate_resync_sequence(WORD16 *sequence); |
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189 |
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190 |
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191 #endif |
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192 |