But there is a strange result. When the snr is 2dB-13dB, the cvx will be failed and give me a wrong answer. But when the snr becomes higher the answer is right. And the answer when snr is 0dB is better than that is 2dB-13dB. I don’t know the reson. It will be kind if someone can help me.
As fort how changing the value of snr should affect the optimal objective value, it’s your model (or wherever you got it from), not ours, so you should be the expert on that, not us. We don’t know what 'should" happen.