In this paper, we define the wavelet multiplier and Landau-Pollak-Slepian (L.P.S) operators on the Hilbert space L-2(G), where G is a locally compact abelian topological group and investigate some of their properties. In particular, we show that they are bounded linear operators, and are in Schatten p-class spaces, 1 <= p <= infinity, and we determine their trace class.