Spectral representation of some non stationary alpha-stable processes

Details Spectral representation of some non stationary alpha-stable processes Spectral representation of some non stationary alpha-stable processes

2008-02-21

arxiv.org/abs/0802.2998v1

Mathematics

Probability

Scientific paper

In this paper, we give a new covariation spectral representation of some non stationary symmetric $\alpha$-stable processes (S$\alpha$S). This representation is based on a weaker covariation pseudo additivity condition which is more general than the condition of independence. This work can be seen as a generalization of the covariation spectral representation of processes expressed as stochastic integrals with respect to independent increments S$\alpha$S processes (see Cambanis (1983)) or with respect to the general concept of independently scattered S$\alpha$S measures (Samorodnitsky and Taqqu 1994). Relying on this result we investigate the non stationarity structure of some harmonisable S$\alpha$S processes especially those having periodic or almost-periodic covariation functions.

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