Patent ID: 7158581

Claim:
A method of determining parameters of an n-port network, comprising: applying at least one modulated input signal train x 1 (t) of differing amplitudes to the n-port network; measuring at least one output signal train x 2 (t+τ) from the n-port network based on an allowance for a temporal displacement τ that the output signal train x 2 (t+τ) has in relation to the input signal train x 1 (t); and determining the temporal displacement τ by cross-correlating the output signal train x 2 (t+τ) with the input signal train x 1 (t), wherein the determining step includes, determining a Fourier transform X 1 (f) of the input signal train x 1 (t), determining a Fourier transform X 2 (f) of the output signal train x 2 (t+τ), and calculating a conjugate complex X* 2 (f) or X* 1 (f) of the Fourier transform X 2 (f) of the output signal train or the Fourier transform X 1 (f) of the input signal train, where f is frequency.