viterbi.h

来自「signal-processing.rar信号处理demo原码」· C头文件 代码 · 共 97 行

/*
//
//               INTEL CORPORATION PROPRIETARY INFORMATION
//  This software is supplied under the terms of a license agreement or
//  nondisclosure agreement with Intel Corporation and may not be copied
//  or disclosed except in accordance with the terms of that agreement.
//    Copyright (c) 2006 Intel Corporation. All Rights Reserved.
//
*/

#include "ipps.h"
#include "ippcore.h"

#include "viterbi_ce.h"
#include "viterbi_mp.h"



#define VITERBI_SNR_MIN     15.0    /* minimum SNR for Viterbi decoder  */
#define TRELLIS_SEQ_LEN     1000    /* trellis sequence lenght          */
#define VITERBI_TEST_LEN    100     /* test performing time             */


typedef struct _ViterbiTestInfo {
    Ipp8u   numPossStates;  /* number of possible next states from given current state          */
    Ipp8u   *ceStates;      /* pointer to array which contains convolutional encoder diagram    */
    Ipp8u   *ceInput;       /* pointer to array which contains convolutional encoder inputs     */
    Ipp8u   ceDlState;      /* convolutional encoder delay state                                */
    Ipp8u   vState;         /* Viterbi decoder type                                             */
} ViterbiTestInfo;


typedef enum _ViterbiState {
    ViterbiState16 = 16,
    ViterbiState32 = 32,
    ViterbiState64 = 64
} ViterbiState;


typedef struct _Real4DSymbl
{
    Ipp16sc m_firstPoint;
    Ipp16sc m_secondPoint;
}   Real4DSymbl;


typedef struct _Symbl4D
{
    Ipp8u m_firstIndex;
    Ipp8u m_secondIndex;
} Symbl4D;


typedef Ipp16sc VarPoint;
#define m_Error re
#define m_Index im


typedef struct _Current4DSymbl
{
    Symbl4D m_IdealSymbl;
    Ipp16u  m_Error;
} Current4DSymbl;


typedef Ipp16sc ViterbiPath;
#define m_oldState im


typedef struct _ViterbiInfo
{
    Real4DSymbl     m_ReferencePoint[64];
    ViterbiPath     m_PathTable[4096];
    VarPoint        m_VariantPoint[16];
    Current4DSymbl  m_CurrentSubsetPoint[32];
    Ipp16u          m_BranchError[64];
    Ipp16u          m_PathError[64];
    Ipp8u           m_NextState[1024];
    Ipp16u          m_TableDept;
    Ipp16u          m_MinPathError;
    Ipp16u          m_Tick;
    Ipp16u          m_flRealData;
    Ipp16u          m_TickMask;
    Ipp8u           m_NumInputBits;
    Ipp8u           m_NumInputCombination;
    Ipp8u           m_MinSost;
    Ipp8u           m_BitInvertion;
    Ipp8u           m_State;
} ViterbiInfo;


void ViterbiInit( ViterbiTestInfo *viterbiInf, Ipp8u viterbiState);
void GetTrellisSequence( Real4DSymbl *trSeq, int len, ViterbiTestInfo *vInf );
int CheckViterbiOut( const Real4DSymbl *tOutput, const Real4DSymbl *vInput, int len, const ViterbiTestInfo* vInf, long* failCount);
int AddChannelNoise( Real4DSymbl *tOutput, Real4DSymbl *vInput, int len, double SNR );