How to reduce this equation into a concave function using SCA


I simplified it using SCA into the following form, but it turned out to be unusable.

SCA is not a cure all for all ills and doesn’t suit all non-convex optimization problems.

If you want to use SCA, it is your responsibility to figure out what modifications to make to your optimization problem so that at each iteration, you have a convex optimization problem (concave objective being maximized) which satisfies CVX"s DCP rules.