4 papers
Phase Retrieval in Hardy Space
Wei Qu, Xiao-Yun Sun, Guan-Tie Deng
This paper concerns the study of reconstructing a function in the Hardy space of the unit disc $\D$ from intensity measurements $|f(z)|,\ z\in \D.$ It's known as the problem of…
Sparse Approximation to the Dirac-δ Distribution
Wei Qu, Tao Qian, Guan-Tie Deng
The Dirac-δ distribution may be realized through sequences of convlutions, the latter being also regarded as approximation to the identity. The present study proposes the so called…
A sufficient condition for n-Best Kernel Approximation in Reproducing Kernel Hilbert Spaces
Wei Qu, Tao Qian, Guan-Tie Deng
We show that if a reproducing kernel Hilbert space consisting of functions defined on enjoys Double Boundary Vanishing Condition (DBVC) and Linear Independent Con…
Rational Approximation in the Bergman Spaces
Wei Qu, Pei Dang
It is known that adaptive Fourier decomposition (AFD) offers efficient rational approxima- tions to functions in the classical Hardy H2 spaces with significant applications. This s…