Patent ID: 8666262

Claim:
An equalizer for a PSK signal, comprising: a conjugate product calculator to calculate a conjugate product r of a current output y t and a precedent output y t-n of the equalizer, wherein r=y t y t-n *, t denotes a current time, t−n denotes a precedent time, and n≧1; an equalization coefficient updator to update the equalization coefficient; and a finite impact response filter to filter an input signal using the updated equalization coefficient, wherein the coefficient updator is configured to update the equalization coefficient using a cost function c constructed based on the conjugate product r, wherein the cost function c is: c=E{|r m −γ| 2 } where E{•} denotes expectation, m denotes the number of constellation points of the PSK signal, r denotes the conjugate product, and γ denotes a constant.