Twisted convolution, pseudo-differential operators and Fourier   modulation spaces
  We discuss continuity of the twisted convolution on (weighted) Fourier modulation spaces. We use these results to establish continuity results for the twisted convolution on Lebesgue spaces. For example we prove that if $\omega$ is an appropriate weight and $1\le p\le 2$, then $L^p_{(\omega)}$ is an algebra under the twisted convolution. 
Joachim Toft