Patent ID: 7107011

Claim:
An interference measurement and evaluation system comprised of: a transmitting means for transmitting a digitally modulated wave signal, a receiving means for decoding a modulated signal from a modulated wave signal received from the transmitting means, and an interference characteristic estimating means for estimating an interference characteristic including a nonlinear interference characteristic by which said received modulated wave signal is affected from an interference signal with respect to said received modulated wave signal due to the nonlinear characteristic of said receiving means, said interference characteristic estimating means referring to a level of said modulated wave signal received by said receiving means, a level of said interference signal, and a nonlinear interference theoretical curve given in relation to a line quality of a modulated signal decoded by said receiving means and estimating an interference characteristic including the nonlinear characteristic possessed by said receiving means, based on the measured level of the modulated wave signal, level of said interference signal, and line quality of said decoded modulated signal.