  Using multi-particle distribution functions we calculate the correlations
produced by a periodically driven scatterer in a system of noninteracting
electrons at zero temperature. The multi-particle correlations due to a quantum
exchange effect are expressed in terms of photon-assisted scattering
amplitudes. The results we obtain are valid for slow but arbitrary in strength
driving. We show that even for large amplitude pumps the zero-frequency noise
power is related to two-particle correlations. In addition to two-particle
correlations a large amplitude pump can generate multi-particle correlations.
