How to express log2(1+ax/(bx+c)),a>0,b>0,c>0,x>0 in CVX？

[WangMeng_1996 (Wang Meng)]

I have prove that this function is concave with respect to x, when a>0,b>0,c>0.

[Mark_L_Stone]

See Can CVX solve this kind of function {x-log(1+0.01*x/(x+1))}

[WangMeng_1996 (Wang Meng)]

Thanks Mark, I’ve known how to model it, thanks a lot!