How can I linearize this constraint

$d_{u,c}\sigma \le ||{\bf f}_{u,c}||^2\le Td_{u,c}$
$\sigma$ is a very small number based on scale of $f$

$T>0$, ${\bf f}_{u,c}$ is optimization variable, a complex vector. $d_{u,c}$ is also an optimization variable which in binary.

How can I linearize this constraint

$$d_{u,c}\sigma \le \|{\bf f}_{u,c}\|^2\le Td_{u,c}$$ $\sigma$ is a very small number based on scale of $f$

$T>0$, ${\bf f}_{u,c}$ is optimization variable, a complex vector. $d_{u,c}$ is also an optimization variable which in binary.

How can I linearise this constraint

$d_{u,c}\sigma \le ||{\bf f}_{u,c}||^2\le Td_{u,c}$
$\sigma$ is a very small number based on scale of $f$

$T>0$, ${\bf f}_{u,c}$ is optimisation variable, a complex vector. $d_{u,c}$ is also an optimization variable which in binary.

How can I linearize this constraint

$d_{u,c}\sigma \le ||{\bf f}_{u,c}||^2\le Td_{u,c}$
$\sigma$ is a very small number based on scale of $f$

$T>0$, ${\bf f}_{u,c}$ is optimization variable, a complex vector. $d_{u,c}$ is also an optimization variable which in binary.