也许这不是唯一的错误，但我注意到，AGC检测器的总和在Matlab文档中从ndx*N到(ndx+1)N-1，但是在您的C代码中，它从 ndx*N至(ndx+1)(N-1)

我知道了。下面的代码针对给定的一组复杂数据提供与matlab相同的输出。

double AGC_Detector(double complex input,double* sum,double state[],unsigned int* idx,int N)
{
    unsigned int first;
    unsigned int nth;
    double output;
    double val = cabs(input)*cabs(input);
    *sum += val;
    output = (*sum)*(1.0/N);
    *sum -= state[*idx-1];

    if(*sum < 0.0){*sum = 0.0;}

    state[*idx-1] = val;
    first = *idx;
    nth = first + 1;

    if(nth < first){nth = 0xFFFFFFFF;}

    *idx = nth;

    if(*idx > N-1){*idx = 1;}

    return output;
}


void use_AGC(double complex* input,double complex* output,double step,double desired_pwr,int avrg_len,int max_pwr,int len)
{
    unsigned int idx = 1;
    int filt_len = avrg_len-1;
    double K = step;
    double g = 0;
    double sum = 0;
    double dtctr = 0;
    double filterState[filt_len];

    for(int i = 0; i < filt_len; i++){filterState[i] = 0;}

    for(int i = 0; i < avrg_len; i++)
    {
        dtctr = AGC_Detector(input[i],&sum,filterState,&idx,avrg_len);
        output[i] = input[i] * exp(g);
        dtctr = log(dtctr);
        g += K*(desired_pwr - (dtctr + 2.0*g));
        if(g > max_pwr){g = max_pwr;}
    }
}