Abstract
Vertex-varying spectral content on graphs challenge the assumption of vertex invariance, and require vertex-frequency representations to adequately analyze them. The localization window in graph Fourier transform plays a crucial role in this analysis. An analysis of the window functions is presented. The corresponding spectrograms are considered from the energy condition point of view as well. Like in time-frequency analysis, the distribution of signal energy as a function of the vertex and spectral indices is an alternative way to approach vertex-frequency analysis. After an introduction to the second part of this chapter, a local smoothness definition, a definition of an ideal form of the vertex-frequency energy distributions, and two energy forms of the vertex-frequency representations are given. A graph form of the Rihaczek distribution is used as the basic distribution to define a class of reduced interference vertex-frequency energy distributions. These distributions reduce cross-terms effects and satisfy graph signal marginal properties. The theory is illustrated through examples.
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Acknowledgements
Ervin Sejdić acknowledges the support of the NSF CAREER grant number 1652203.
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Stanković, L., Daković, M., Sejdić, E. (2019). Vertex-Frequency Energy Distributions. In: Stanković, L., Sejdić, E. (eds) Vertex-Frequency Analysis of Graph Signals. Signals and Communication Technology. Springer, Cham. https://doi.org/10.1007/978-3-030-03574-7_11
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