ESTIMATION APPARATUS, ESTIMATION METHOD AND PROGRAM
An estimation device includes: a difference derivation unit that derives a first power difference between a positive frequency component and a negative frequency component of a received signal or derives a second power difference between a positive time component and a negative time component of the received signal; and an offset estimation unit that estimates a frequency offset value of the received signal on the basis of the first power difference or the second power difference. The estimation device may further include a compensation unit that compensates for frequency offset by using the frequency offset value. In a case where there is a plurality of potential frequency offset values, the compensation unit may compensate for the frequency offset of the received signal on the basis of a predetermined offset value.
1 . An estimation device comprising:
a difference derivator that derives a first power difference between a positive frequency component and a negative frequency component of a received signal or derives a second power difference between a positive time component and a negative time component of the received signal; and
an offset estimator that estimates a frequency offset value of the received signal on the basis of the first power difference or the second power difference.
2 . The estimation device according to claim 1 , further comprising
a compensator that compensates for frequency offset of the received signal by using the frequency offset value.
3 . The estimation device according to claim 2 , wherein:
in a case where there is a plurality of potential frequency offset values, the compensator compensates for the frequency offset of the received signal on the basis of a predetermined offset value; and
in a case where the first power difference or the second power difference decreases, the offset estimator selects a smaller frequency offset value from the potential frequency offset values as the frequency offset value to be used for compensation, and
in a case where the first power difference or the second power difference increases, the offset estimator selects a larger frequency offset value from the potential frequency offset values as the frequency offset value to be used for compensation.
4 . An estimation method performed by an estimation device, the estimation method comprising:
deriving a first power difference between a positive frequency component and a negative frequency component of a received signal or deriving a second power difference between a positive time component and a negative time component of the received signal; and
estimating a frequency offset value of the received signal on the basis of the first power difference or the second power difference.
5 . A non-transitory computer readable medium which stores a program for causing a computer to execute:
a procedure of deriving a first power difference between a positive frequency component and a negative frequency component of a received signal or deriving a second power difference between a positive time component and a negative time component of the received signal; and
a procedure of estimating a frequency offset value of the received signal on the basis of the first power difference or the second power difference.