信噪比估计（求助）

蝉471249982

我用FFT对以未知的带高斯白噪声BPSK信号处理，得到sqrt(I^2+Q^2)包络，怎样对包络估计它的信噪比和噪声功率？？求神人指教！！

spwedasd

If I and Q are pilots, the noise_power = SUM (I_received-I_theory)^2 + (Q_received -Q_theory)^2; SNR=SUM (I^2+Q^2)/noise_power.  There may be a bias in this estimation. If the I,  Q are not pilots, the I, Q need first be decoded; replaced  the pilots by the decoded values.