1 citations · 1 across the 4 of their papers we have counts for
5 papers
Some unexpected behaviors of operators with small time-frequency dispersion
Dae Gwan Lee
We study the approximation properties of pseudo-differential operators with small time-frequency dispersion, meaning that their spreading functions are supported in a small neighbo…
Bases of complex exponentials with restricted supports
Dae Gwan Lee, Goetz E. Pfander, David Walnut
The complex exponentials with integer frequencies form a basis for the space of square integrable functions on the unit interval. We analyze whether the basis property is maintaine…
On construction of bounded sets not admitting a general type of Riesz spectrum
Dae Gwan Lee
Despite the recent advances in the theory of exponential Riesz bases, it is yet unknown whether there exists a set which does not admit a Riesz spectrum, m…
A note on the invertibility of the Gabor frame operator on certain modulation spaces
Dae Gwan Lee, Friedrich Philipp, Felix Voigtlaender
We consider Gabor frames generated by a general lattice and a window function that belongs to one of the following spaces: the Sobolev space , the weighted…
Time-frequency shift invariance of Gabor spaces generated by integer lattices
Carlos Cabrelli, Dae Gwan Lee, Ursula Molter +1
We study extra time-frequency shift invariance properties of Gabor spaces. For a Gabor space generated by an integer lattice, we state and prove several characterizations for its t…