v34trans.c

数字通信第四版原书的例程

    sprintf(err_msg, "A = %d; ", A);
    mexPrintf(err_msg);
}
#endif
        /* B */
        V_bef = 0;
        R_bef = (int)z8[A];
        V_now = 0;
        R_now = R_bef;
        while ((R[0] - R_now >= 0) & (A - V_now >= 0)) {
            R_bef = R_now;
            V_bef = V_now;
            V_now = V_now + 1;;
            R_now = (int)z8[A];
            for (i = 0; i < V_now; i++) {
                R_now = R_now + (int)(g4[i] * g4[A - i]);
            }
        }
        if (A < V_now) {
            R[1] = R[0] - R_bef;
            B = V_bef;            
        } else if (R[0] - R_now >= 0) {
            R[1] = R[0] - R_now;
            B = V_now;
        } else {
            R[1] = R[0] - R_bef;
            B = V_bef;
        }
#ifdef MATLAB_MEX_FILE
if (0) {
    char    err_msg[256];
    sprintf(err_msg, "B = %d; ", B);
    mexPrintf(err_msg);
}
#endif
        /* C */
        R[2] = R[1] % (int)g4[B];
        R[3] = (R[1] - R[2]) / (int)g4[B];

        V_bef = 0;
        R_bef = 0;
        V_now = 0;
        R_now = R_bef;
        while ((R[2] - R_now >= 0) & (B - V_now >= 0)) {
            R_bef = R_now;
            V_bef = V_now;
            V_now = V_now + 1;;
            R_now = 0;
            for (i = 0; i < V_now; i++) {
                R_now = R_now + (int)(g2[i] * g2[B - i]);
            }
        }
        if (B < V_now) {
            R[4] = R[2] - R_bef;
            C = V_bef;            
		} else if (R[2] - R_now >= 0) {
            R[4] = R[2] - R_now;
            C = V_now;
        } else {
            R[4] = R[2] - R_bef;
            C = V_bef;
        }
#ifdef MATLAB_MEX_FILE
if (0) {
    char    err_msg[256];
    sprintf(err_msg, "C = %d; ", C);
    mexPrintf(err_msg);
}
#endif
		/* D */
        V_bef = 0;
        R_bef = 0;
        V_now = 0;
        R_now = R_bef;
        while ((R[3] - R_now >= 0) & (A - B - V_now >= 0)) {
            R_bef = R_now;
            V_bef = V_now;
            V_now = V_now + 1;
            R_now = 0;
            for (i = 0; i < V_now; i++) {
                R_now = R_now + (int)(g2[i] * g2[A - B - i]);
            }
        }
        if (A-B < V_now) {
            R[5] = R[3] - R_bef;
            D = V_bef;
		} else if (R[3] - R_now >= 0) {
            R[5] = R[3] - R_now;
            D = V_now;
        } else {
            R[5] = R[3] - R_bef;
            D = V_bef;
        }
#ifdef MATLAB_MEX_FILE
if (0) {
    char    err_msg[256];
    sprintf(err_msg, "D = %d; ", D);
    mexPrintf(err_msg);
}		
#endif		
        /* E */
        E = R[4] % (int)g2[C];

        /* F */
        F = (R[4] - E) / (int)g2[C];

        /* G */
        G = R[5] % (int)g2[D];

        /* H */
        H = (R[5] - G) / (int)g2[D];

        /* calculate mijk[0-7] */
        /* mi0k */
        if (C < rate_M) {
            mijk[0] = E;
            mijk[1] = C - mijk[0];
        } else {
            mijk[1] = rate_M - 1 - E;
            mijk[0] = C - mijk[1];
        }

        /* mi1k */
        if ((B - C) < rate_M) {
            mijk[2] = F;
            mijk[3] = B - C - mijk[2];
        } else {
            mijk[3] = rate_M - 1 - F;
            mijk[2] = B - C - mijk[3];
        }

        /* mi2k */        
        if (D < rate_M) {
            mijk[4] = G;
            mijk[5] = D - mijk[4];
        } else {
            mijk[5] = rate_M - 1 - G;
            mijk[4] = D - mijk[5];
        }

        /* mi3k */
        if ((A - B - D) < rate_M) {
            mijk[6] = H;
            mijk[7] = A - B - D - mijk[6];
        } else {
            mijk[7] = rate_M - 1 - H;
            mijk[6] = A - B - D - mijk[7];
        }
#ifdef MATLAB_MEX_FILE
if (0) {
    char    err_msg[256];
    sprintf(err_msg, "Caller\n");
    mexPrintf(err_msg);    
    sprintf(err_msg, "A = %d; B = %d; C = %d; D = %d; E = %d; F = %d; G = %d; H = %d \n",A, B, C, D, E, F, G, H );
    mexPrintf(err_msg);
    sprintf(err_msg, "R[0]=%d; R[1]=%d; R[2]=%d; R[3]=%d; R[4]=%d; R[5]=%d \n",R[0],R[1],R[2],R[3],R[4],R[5]);
    mexPrintf(err_msg);
    sprintf(err_msg, "mijk[0]=%d; mijk[1]=%d; mijk[2]=%d; mijk[3]=%d; mijk[4]=%d; mijk[5]=%d; mijk[6]=%d; mijk[7]=%d \n",mijk[0],mijk[1],mijk[2],mijk[3],mijk[4],mijk[5],mijk[6],mijk[7]);
    mexPrintf(err_msg);        
}
#endif
        *last_updata = 1;
        *out_count = 0;
if (1) {
    char    err_msg[256];
    V_bef = 0;
    for (i = 0; i < 8; i++) {
        V_bef = mijk[i] > V_bef ? mijk[i] : V_bef;
    }
#ifdef MATLAB_MEX_FILE
    if (V_bef > 11) {
        sprintf(err_msg, "A=%d; B=%d; C=%d; D=%d; E=%d; F=%d; G=%d; H=%d \n", A, B, C, D, E, F, G, H );
        mexPrintf(err_msg);
        sprintf(err_msg, "R(0)=%d; R(1)=%d; R(2)=%d; R(3)=%d; R(4)=%d; R(5)=%d \n",R[0],R[1],R[2],R[3],R[4],R[5]);
        mexPrintf(err_msg);            
        for (i = 0; i < 8; i++) {
            sprintf(err_msg, "mijk(%d)=%d; ", i, mijk[i]);
            mexPrintf(err_msg);
        }
        sprintf(err_msg, "\n ");
        mexPrintf(err_msg);
    }
#endif
}        
    } else if (u[rate_b] <= 0) {
        *last_updata = 0;
    }

    if ((u[rate_b+1] > 0) && (*last_output == 0)) {
        if (*out_count < 8) {
            long base_count, k, tmp, i;

            k = *out_count % 2;
            base_count = (*out_count / 2) * (3 + 2 * rate_q) + rate_K;
            
            tmp = base_count + 3 + k * rate_q;
            for (i = 0; i < rate_q; i++) {
                y[i] = data_scrm[tmp + i];
            }
            y[rate_q] = mijk[*out_count];
            for (i = 0; i < 3; i++) {
                y[i + rate_q + 1] = data_scrm[base_count + i];
            }
            y[rate_q + 4] = k;
#ifdef MATLAB_MEX_FILE
if (0) {
    char    err_msg[256];
    sprintf(err_msg, "Time=%f; y[0]=%f; base_count = %d;  \n", ssGetT(S), y[rate_q], *out_count );
    mexPrintf(err_msg);
}            
#endif
        }
        /* at the very end */
        *out_count = *out_count + 1;
        *last_output = 1;
    } else {
        if (u[rate_b + 1] <= 0)
           *last_output = 0;
        if (ssGetT(S) == 0){
            int i;
            /* the initial condition before anything is out. */
            for (i = 0; i < rate_q + 5; i++) {
                y[i] = 0;
            }
        }
    }
}

/*
 * mdlUpdate - computes the discrete states of the S-Function
 */

static void mdlUpdate(x, u, S, tid)
    double *x, *u;
    SimStruct *S;
    int tid;
{
}

/*
 * mdlDerivatives - computes the derivatives of the S-Function
 */

static void mdlDerivatives(dx, x, u, S, tid)
    double *dx, *x, *u;
    SimStruct *S;
    int tid;
{
}

/*
 * mdlTerminate - called at termination of model execution.
 */

static void mdlTerminate(S)
    SimStruct *S;
{
}

#ifdef  MATLAB_MEX_FILE    /* Is this file being compiled as a MEX-file? */
#include "simulink.c"      /* MEX-File interface mechanism */
#else
#include "cg_sfun.h"       /* Code generation registration function */
#endif