Patent ID: 7564924

Claim:
A reception device comprising: an averaging unit configured to calculate at least one average value concerning in-phase components and quadrature phase components for a plurality of received data symbols; an amplitude estimator configured to estimate locations of signal points defined by a predetermined quadrature amplitude modulation, based on the at least one average value calculated by the averaging unit; a hard decision unit configured to determine, within the signal points, a closest signal point to an actual signal point of each of the received plurality of data symbols; and a symbol number determination unit configured to determine a number of the plurality of received data symbols based on both a fading frequency and a change in the average value, wherein the averaging unit is configured to calculate the at least one average value, every number of the plurality of received data symbols determined by the symbol number determination unit, and the amplitude estimator is configured to estimate the locations of the signal points, every number of the plurality of received data symbols determined by the symbol number determination unit.