Adaptive type signal estimator

An adaptive type signal estimator comprising:

• an estimation signal storage unit for outputting a first sample signal to which nonlinear distortion is added;
• a convolution arithmetic unit for adding linear distortion to the first sample signal and outputting a signal as a second sample signal;
• a branch metric arithmetic unit for generating a branch metric used for Viterbi algorithm operation from a reception signal and the second sample signal, and outputting the branch metric;
• a signal determination unit for outputting a determination signal by performing maximum-likelihood sequence estimation using an output from said branch metric arithmetic unit on the basis of a Viterbi algorithm;
• and
• a coefficient corrector for receiving the first sample signal, the reception signal, and the determination signal, and outputting data correcting the second sample signal output from said convolution arithmetic unit,
• wherein said coefficient corrector obtains a difference signal on the basis of a replica generated from the determination signal and the first sample signal and a delayed reception signal obtained by delaying the reception signal by a predetermined period of time, obtains a product signal by multiplying the difference signal by a convergence factor, updates an impulse response value by using the product signal, and outputs the updated impulse response value to said convolution arithmetic unit.