Continuous Gabor transform for semi-direct product of locally compact groups

TL;DR

This paper introduces a new continuous Gabor transform tailored for semi-direct product groups of locally compact groups, establishing fundamental properties and demonstrating applications to well-known groups.

Contribution

It develops a novel $ au imes\hat{ au}$-continuous Gabor transform for semi-direct product groups, including Plancherel and reconstruction formulas, with practical applications.

Findings

The Gabor transform satisfies the Plancherel theorem.

A reconstruction formula is established for the transform.

Applications are demonstrated on specific semi-direct product groups.

Abstract

Let $H$ be a locally compact group, $K$ be an LCA group, $\tau:H\to Aut(K)$ be a continuous homomorphism and $G_\tau=H\ltimes_\tau K$ be the semi-direct product of $H$ and $K$ with respect to the continuous homomorphism $\tau$. In this article we introduce the $\tau\times\hat{\tau}$-time frequency group $G_{\tau\times\hat{\tau}}$. We define the $\tau\times\hat{\tau}$-continuous Gabor transform of $f\in L^2(G_\tau)$ with respect to a window function $u\in L^2(K)$ as a function defined on $G_{\tau\times\hat{\tau}}$. It is also shown that the $\tau\times\hat{\tau}$-continuous Gabor transform satisfies the Plancherel Theorem and reconstruction formula. This approach is tailored for choosing elements of $L^2(G_\tau)$ as a window function. Finally, we illustrate application of these methods in the case of some well-known semi-direct product groups.