Coefficient update amount output device, coefficient update device, coefficient update amount output method, and recording medium

A filter coefficient update amount output method of outputting a coefficient update amount being a value for updating a filter coefficient of a digital filter included in an equalization device configured to equalize a received sample value of a received signal received with coherent reception by means of digital data processing, the filter coefficient update amount output method comprising:

• performing first output for outputting a first coefficient update amount derived from a difference between a temporary determination result concerning a processed received sample value being the received sample value on which filter processing by the digital filter has been performed, and the processed received sample value;
• performing second output for outputting a second coefficient update amount derived from a gradient with respect to the filter coefficient in such a way as to minimize a magnitude of a difference between statistical information on the processed received sample value for a given time width, and a set value for the statistical information;
• and
• performing third output for outputting the coefficient update amount derived from the first coefficient update amount and the second coefficient update amount.

A recording medium recording a filter coefficient update amount output program causing a computer to perform filter coefficient update amount output for outputting a coefficient update amount being a value for updating a filter coefficient of a digital filter included in an equalization device configured to equalize a received sample value of a received signal received with coherent reception by means of digital data processing, the program causing the computer to perform:

• processing of performing first output for outputting a first coefficient update amount derived from a difference between a temporary determination result concerning a processed received sample value being the received sample value on which filter processing by the digital filter has been performed, and the processed received sample value;
• processing of performing second output for outputting a second coefficient update amount derived from a gradient with respect to the filter coefficient in such a way as to minimize a magnitude of a difference between statistical information on the processed received sample value for a given time width, and a set value for the statistical information;
• and
• processing of performing third output for outputting the coefficient update amount derived from the first coefficient update amount and the second coefficient update amount.