LOG-LIKELIHOOD RATIO CALCULATION CIRCUIT, RECEPTION DEVICE, AND LOG-LIKELIHOOD RATIO CALCULATION METHOD

摘要

A LLR calculation unit includes a range detection unit that detects a range in which a received signal resulting from a modulo operation is present among a plurality of ranges defined on the basis of a boundary value in the modulo operation; a coefficient determination unit that determines a coefficient to be used for calculation of a log-likelihood ratio for a most significant bit in quadrature amplitude modulation of the received signal resulting from the modulo operation on the basis of a result of detection by the range detection unit; and an LLR computation unit that calculates the log-likelihood ratio for the most significant bit by using the received signal resulting from the modulo operation and the coefficient.