The Gabor wave front set

We define the Gabor wave front set WFG(u) of a tempered distribution u in terms of rapid decay of its Gabor coefficients in a conic subset of the phase space. We show the inclusion WFG(aw(x,D)u) ⊂ WFG(u), u ∈ S′(ℝd), a ∈ S0,00, where S0,00 denotes the Hörmander symbol class of order zero and parameter values zero. We compare our definition with other definitions in the literature, namely the classical and the global wave front sets of Hörmander, and the S-wave front set of Coriasco and Maniccia. In particular, we prove that the Gabor wave front set and the global wave front set of Hörmander coincide. © 2013 Springer-Verlag Wien.