  Time-frequency analysis have played a crucial role in the development of
localization operators in the last twenty years. We present its applications to
the study of boundedness and Schatten Class property for such operators. In
particular, new sufficient conditions for such operators to belong to the
Schatten-von Neumann Class $S_p$, $0<p<1$, are exhibited.
  As a byproduct, sharp continuity results for the Wigner distribution are also
presented.
