after modifying it, the error become
Error using cvxprob/newcnstr (line 192) Disciplined convex programming error: Invalid constraint: {convex} >= {convex}
Error in >= (line 21)
b = newcnstr( evalin( 'caller', 'cvx_problem', '[]' ), x, y, '>=' );
Error in f_kI (line 51)
numerator >= max(bar_r(1) * max(real(total)+nois_var_ak_2pow(1) + nois_var_dk_2pow(1)),0)