How to deal with Log( {complex affine} )

1

This is my code:

variable Psi_hat(M+1, M+1) hermitian
for k=1 : K
for j=1 : K
V1(k, j) =real(trace(V(:, :, k, j)* Psi_hat)) + (h_d(k, j))^2;
d1(k, j)= trans_power_ini(j)*V1(k, j);
d1_all = d1_all +d1(k, j);
end
end

for k=1 : K
D1(k) = (log(d1_all + (noise_maxpower^2)*(norm(W_ini(:, k)', 2))^2))/(log(2)) ;
end

The problem I detected may be d1_ all is an affine function, while log () should convert the parentheses into concave functions, that is, V1 into concave functions, but I will not convert it. I have also referred to this article, Log( {complex affine} ) - #6 by Mark_L_Stone but I still haven’t solved it.

Please help me :pray:

2

It must be the case that some of the input data is complex. The argument of log needs to be concave, which implies it needs to be real.

I can’t tell you what the proper fix is, because it’s not my model.

3

ok，thank you. Let me try to convert my input parameters to real numbers.

4

Problem solved,The advice you gave was very helpful! thank you so much! :grin: