FreeCalypso > hg > fc-magnetite

annotate src/cs/layer1/gtt_include/ctm/wait_for_sync.h @ 4:56abf6cf8a0b

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cdg211: cdginc/mdf/pdf files from TCS211-20070608
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 26 Sep 2016 01:11:35 +0000
parents 945cf7f506b2
children
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945cf7f506b2 src/cs: chipsetsw import from tcs211-fcmodem
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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