LIKELIHOOD VALUE CALCULATION DEVICE, LIKELIHOOD VALUE CALCULATION METHOD, AND RADIO SYSTEM

摘要

A likelihood value calculation device includes: likelihood value calculation unit 201 that takes as input an equalization signal of a modulated signal, that, in accordance with a first control signal, calculates from the equalization signal that was received as input a provisional likelihood value for which the bit value of each signal point is “0” for each bit position; arithmetic inversion unit 202 that, in accordance with a second control signal, supplies for each bit position a provisional likelihood value without alteration that was supplied from likelihood value calculation unit 201 or subjects the provisional likelihood value that was supplied from likelihood value calculation unit 201 to arithmetic inversion and supplies the likelihood value following inversion; and operation control unit 200 that holds, for each combination of a radio mode and modulation mode, a control pattern that is used to control the operations of at least likelihood value calculation unit 201 and arithmetic inversion unit 202 and that generates the first and second control signals in accordance with the control pattern that is designated from among these control patterns.