FreeCalypso > hg > fc-magnetite

annotate src/cs/layer1/gtt_include/ctm/wait_for_sync.h @ 581:a0a45c5eb3ef

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gsmcomp.c: bumping trace partition size to 220 like in gprscomp.c This change is safe in terms of RAM usage because all of these partition pools have already been moved from XRAM to IRAM earlier, and our IRAM usage in VO configs is currently quite low - the one near the limit is XRAM on C11x.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 29 Jan 2019 03:52:49 +0000
parents 945cf7f506b2
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 : 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