| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a likelihood weighting circuit capable of appropriately calculating likelihood even under an environment where there are influences of spurious noise and frequency selective fading.SOLUTION: A likelihood weighting circuit 120 includes: a weighting part 130 that performs weighting on first likelihood of a reception signal that is calculated by a soft determination for a sub carrier, on the basis of a power value of the reception signal or a modulation error ratio of the sub carrier; a variance calculation part 140 for calculating the variance of the power value and the modulation error ratio; a likelihood value measuring part 160 for measuring a value of second likelihood resulting from weighting the first likelihood in the weighting part; a control part 180 for calculating a first relaxation degree and a second relaxation degree of the power value and the modulation error ratio, respectively, on the basis of the variance of the power value and the modulation error ratio and the value of the second likelihood; a first normalization processing part 150A for normalizing the power value of the reception signal to be inputted to the weighting part on the basis of the first relaxation degree; and a second normalization processing part 150B for normalizing the modulation error ratio to be inputted to the weighting part on the basis of the second relaxation degree.</p> |
