awgn()函数在c++实现

awgn()函数是用于添加高斯白噪声的函数，具体实现可以参考以下代码：

#include <iostream>
#include <cmath>
#include <random>

using namespace std;

double awgn(double signal, double snr) {
    double noise = 0;
    double power_signal = signal * signal;
    double power_noise = power_signal / pow(10, snr / 10);

    std::default_random_engine generator;
    std::normal_distribution<double> distribution(0, sqrt(power_noise / 2));

    noise = distribution(generator);
    double noisy_signal = signal + noise;

    return noisy_signal;
}

int main() {
    double signal = 1.0;
    double snr = 10.0;
    double noisy_signal = awgn(signal, snr);

    cout << "Original Signal: " << signal << endl;
    cout << "Noisy Signal: " << noisy_signal << endl;

    return 0;
}

在该代码中，使用了C++11的随机数生成库random，通过正态分布生成高斯白噪声，并且根据信噪比计算噪声功率，最后将噪声和信号相加得到带噪信号。