16 How to determine figure of merit for VSB using coherent detector?

\[ s\left ( t\right ) =\frac {A_{c}}{2}\left [ m\left ( t\right ) \cos \omega _{c}t\mp m_{Q}\left ( t\right ) \sin \omega _{c}t\right ] \]

\(m_{Q}\left ( t\right ) \) is the output of VSB filter when input is \(m\left ( t\right ) \)