How to choose the amplification factor for the required SNR in MatLab ?

2 次查看（过去 30 天）
Muhammad Qutab ud din
I have a given noise vector with certain variance. That cannot be changed. I have an IQ-modulated signal and it needs to be amplified to get an SNR of 20dBs. How do I go about that?
k = 3/2; %certain variance
n = sqrt(k).*randn(1, N); %noise vector
noise_power = var(n);
SNR = 10*log10(var(Xiq)/noise_power) %current SNR of the IQ modulated signal
amp = 13.5; %some amplification, I can't figure out what it should be
Xamp = amp.* Xiq;
SNR = 10*log10(var(Xamp)/noise_power) %SNR in dB should be 20 dBs
Currently I am using a fixed scaling factor but I know this isn't the correct way to do it. Can someone help me please?

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