I’m facing a problem with my code in CVX. I don’t know how to express the convex constraint that log(1+Ax/(Bx+c))>=Q.where A,B and C is all greater than 0.I would appreciate it if anyone can help me.

I think you can use the same approach as @Michal_Adamaszek’s answer in Can CVX solve this kind of function {x-log(1+0.01*x/(x+1))} .

Thank you very much. I have found the answer.