Course detail

Applied Harmonic Analysis

FSI-9AHAAcad. year: 2023/2024

General theory of generating systems in Hilbert spaces: orthonormal bases (ONB), Riesz bases (RB), frames and reproducing kernels.
The associated operators (for reconstruction, discretization, etc.). Properties and characterization theorems. Canonical duality. Useful constructions and algorithms based on the application of the theory of pseudoinverse operators. Special frames (Gabor and wavelet) and their applications.

Language of instruction


Number of ECTS credits


Mode of study

Not applicable.

Entry knowledge

Linear algebra, differential and integration calculus, linear functional analysis.

Rules for evaluation and completion of the course

Seminar presentations and/or oral examination.
Absence has to be made up by self-study and possibly via assigned homework.


The PhD students will be made familiar with the latest achievements of the modern harmonic analysis and their applicability for the solution of practical problems of functional modeling in abstract spaces, in particular in l^2(J) (the space of discrete signals incl. images), L^2(R) (the space of analog signals) and L^2(Omega;A;P) (stochastic linear time series models).
Attention will be paid also to the problems of finding numerically stable sparse solutions in models with a large number of parameters.
Getting basic theoretical knowledge in modern harmonic analysis. Attaining practical skills which will allow the PhD students to use all these approaches effectively in computer-aided modeling and research of real systems.

Study aids

Not applicable.

Prerequisites and corequisites

Not applicable.

Basic literature

V. Veselý a P. Rajmic. Funkcionálnı́ analýza s aplikacemi ve zpracovánı́ signálů, Odborná učebnice (4.vyd.). Vysoké učenı́ technické v Brně, Brno (CZ), 2019. ISBN 978-80-214-5186-5. (CS)
Ch.Heil: A Basis Theory Primer, expanded edition, Birkhäuser, New York, 2011 (EN)
O. Christensen: An Introduction to Frames and Riesz bases. Birkhäuser 2003 (EN)
A. Teolis: Computational Signal processing with wavelets. Birkhäuser 1998 (EN)

Recommended reading

S.S. Chen, D.L. Donoho and M. Saunders: Atomic Decomposition by Basis Pursuit, SIAM J. Sci. Comput. 20 (1998), no. 1, 33–61, reprinted in SIAM Review, 43 (2001), no. 1, pp. 129–159. (EN)
G.G. Walter: Wavelets and other orthogonal systems with Applications, CRC Press, Boca Raton, Florida, 1994. (EN)
Ch. K. Chui: An Introduction to wavelets, Wavelet Analysis and Its Applications, vol. 1, Academic Press, Inc., San Diego, CA, 1992. (EN)
I. Daubechies: Ten Lectures on Wavelets, Ingrid Daubechies, CBMS-NSF Regional Conference Series in Applied Mathematics, vol. 61, SIAM, Philadelphia, Pennsylvania, 1992. (EN)
Y. Meyer: Wavelets and operators, Cambridge Studies in Advanced Mathematics, vol. 37, Cambridge University Press, Cambridge, 1992. (EN)
H. G. Feichtinger (ed.) and T. Strohmer (ed.), Gabor analysis and algorithms. Theory and applications, Applied and Numerical Harmonic Analysis, Birkhäuser, Boston-Basel-Berlin, 1998 (EN)

Classification of course in study plans

  • Programme D-APM-K Doctoral, 1. year of study, summer semester, recommended
  • Programme D-APM-P Doctoral, 1. year of study, summer semester, recommended

Type of course unit



20 hours, optionally

Teacher / Lecturer


Facultative topics related to the students' doctoral study programe:
1. Pseudoinverse operators in Hilbert spaces
2. Transition from orthonormal bases (ONB) to Riesz bases (RB) and frames
3. Discretization, reconstruction, correlation and frame operator
4. Characterizations of ONBs, RBs and frames. Duality principle
5. Reproducing kernel Hilbert spaces
6. Selected algorithms for the solution of inverse problems, handling numerical instability connected with overparametrization (overcomplete frames)
7. Some special spaces and their properties
8. Some special operators and their properties
9. Gabor frames
10. Wavelet frames
11. Multiresolution analysis
12. Reserve
Seminar: student presentations of special topics possibly closely connected with PhD thesis