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annotate src/cs/layer1/gtt_include/ctm/viterbi.h @ 0:92470e5d0b9e

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src: partial import from FC Selenite
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 15 May 2020 01:28:16 +0000
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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 *
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6 * The program(s) may be used and/or copied only with the
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7 * written permission from Ericsson or in accordance
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8 * with the terms and conditions stipulated in the agreement or
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9 * contract under which the program(s) have been supplied.
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10 *
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11 *******************************************************************************
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12 *
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13 * File : viterbi.h
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14 * Purpose : Header file for viterbi.c
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15 * Author : Francisco Javier Gil Gomez
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16 *
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17 * Revision history
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18 *
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19 * $Log: $
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20 *
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21 *******************************************************************************
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22 */
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23
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24 #ifndef viterbi_h
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25 #define viterbi_h "$Id: $"
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26
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27 #include <stdio.h>
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28 #include <math.h>
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29
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30 #include "conv_poly.h" /* definition of viterbi_t */
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31
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32
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33 /***********************************************************************/
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34 /* viterbi_init() */
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35 /* ************** */
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36 /* Initialization of the Viterbi decoder. */
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37 /* */
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38 /* output variables: */
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39 /* *viterbi_state initialized state variable of the decoder */
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40 /* */
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41 /***********************************************************************/
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42
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43 void viterbi_init(viterbi_t* viterbi_state);
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44
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45
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46 /***********************************************************************/
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47 /* viterbi_reinit() */
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48 /* **************** */
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49 /* Re-Initialization of the Viterbi decoder. This function should be */
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50 /* used for re-setting a Viterbi decoder that has already been */
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51 /* initialized. In contrast to viterbi_init(), this reinit function */
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52 /* does not calculate the values of all members of viterbi_state that */
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53 /* do not change during the execution of the Viterbi algorithm. */
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54 /* */
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55 /* output variables: */
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56 /* *viterbi_state initialized state variable of the decoder */
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57 /* */
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58 /***********************************************************************/
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59
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60 void viterbi_reinit(viterbi_t* viterbi_state);
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61
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62
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63 /***********************************************************************/
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64 /* viterbi_exec() */
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65 /* ************** */
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66 /* Execution of the Viterbi decoder */
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67 /* */
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68 /* input variables: */
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69 /* inputword Vector with gross bits */
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70 /* length_input Number of valid gross bits in vector inputword.*/
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71 /* length_input must be an integer multiple of */
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72 /* CHC_RATE */
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73 /* */
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74 /* output variables: */
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75 /* out Vector with the decoded net bits. The net bits */
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76 /* are either 0 or 1. */
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77 /* *num_valid_out_bits Number of valid bits in vector out */
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78 /* */
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79 /* input/output variables: */
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80 /* *viterbi_state State variable of the decoder */
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81 /* */
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82 /***********************************************************************/
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83
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84 void viterbi_exec(WORD16* inputword, WORD16 length_input,
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85 WORD16* out, WORD16* num_valid_out_bits,
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86 viterbi_t* viterbi_state);
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87
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88 #endif