Cohen class of time-frequency representations and operators: boundedness and uncertainty principles

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This paper presents a proof of an uncertainty principle of Donoho-Stark type involving ε-concentration of localization operators. More general operators associated with time-frequency representations in the Cohen class are then considered. For these operators, which include all usual quantizations, we prove a boundedness result in the Lᵖ functional setting and a form of uncertainty principle analogous to that for localization operators.