1. An interference identifying device comprising:
an acquiring unit to acquire a reception signal
obtained by reception of an electromagnetic wave;
a frequency converting unit to calculate, using the reception signal, matrix data indicating complex amplitude at each time and frequency of the reception signal;
an autocorrelation-value calculating unit to calculate, using the matrix data, a correlation value between a frequency distribution at first time and a frequency distribution at second time; and
an identifying unit to identify characteristics of an interference signal using the correlation value.
2. The interference identifying device according to claim
1, further comprising:
a power-value calculating unit to calculate power values from the complex amplitude, which is an element of the matrix data;
an average-power calculating unit to calculate an average power value on the basis of the power values output from the power-value calculating unit; and
a frequency count unit to count a frequency of the power values, which are output from the power-value calculating unit, exceeding the average power value, wherein
the identifying unit further identifies the characteristics of the interference signal on the basis of the frequency calculated by the frequency count unit.
3. The interference identifying device according to claim
1 or 2, wherein the identifying unit identifies presence or
absence of the interference signal on the basis of the

average power value.
4. The interference identifying device according to claim
1, wherein
the interference identifying device is set in a wireless communication apparatus,
the interference identifying device further comprises:
a transmission-frequency-information acquiring unit to acquire communication information, which is information concerning a transmission frequency and a transmission time used by the wireless communication apparatus; and
a frequency and time determining unit to calculate, on the basis of the communication information, a reception frequency and a reception time period for receiving a desired wave, wherein
the autocorrelation-value calculating unit calculates the correlation value using the matrix data excluding elements corresponding to the reception frequency and the reception time period.
5. The interference identifying device according to claim
4, further comprising:
a power-value calculating unit to calculate power values from the complex amplitude, which is an element of the matrix data;
an average-power calculating unit to calculate an average power value on the basis of power values excluding power values corresponding to the reception frequency and the reception time period among the power values output from the power-value calculating unit; and
a frequency count unit to count a frequency of the power values, excluding the power values corresponding to the reception frequency and the reception time period among

the power values output from the power-value calculating unit, exceeding the average power value, wherein
the identifying unit identifies the characteristics of the interference signal further on the basis of the freguency calculated by the frequency count unit.
6. The interference identifying device according to claim 5, wherein the identifying unit identifies presence or absence of the interference signal on the basis of the average power value.
7. The interference identifying device according to claim 4, further comprising:
a power-value calculating unit to calculate power values from the complex amplitude, which is an element of the matrix data;
an average-power calculating unit to calculate an average power value on the basis of power values corresponding to the reception frequency and the reception time period among the power values output from the power-value calculating unit; and
a frequency count unit to count a frequency of power values, excluding the power values corresponding to the reception frequency and the reception time period among the power values output from the power-value calculating unit, exceeding the average power value, wherein
the identifying unit calculates, further on the basis of the frequency counted by the frequency count unit, a ratio of interference signals affecting the desired wave.
8. The interference identifying device according to any
one of claims 1 to 7, further comprising a frequency-
autocorrelation-value calculating unit to calculate a

frequency correlation value, which is a correlation value between a time distribution of a first frequency and a time distribution of a second frequency using the matrix data, wherein
the identifying unit identifies the characteristics of the interference signal further on the basis of the frequency correlation value calculated by the frequency-autocorrelation- value calculating unit.
9. The interference identifying device according to any one of claims 1 to 8, wherein the frequency converting unit calculates the matrix data by performing short-time Fourier transform on the reception signal.
10. The interference identifying device according to any one of claims 1 to 9, wherein
the autocorrelation-value calculating unit calculates the correlation values concerning combinations of all times corresponding to the matrix data and calculates an accumulation result of the calculated correlation values, and
the identifying unit identifies the characteristics of the interference signal on the basis of the accumulation result.
11. A wireless communication apparatus comprising the interference identifying device according to any one of claims 1 to 10.
12. An interference identifying method comprising:
a first step of acquiring a reception signal obtained by reception of an electromagnetic wave;
a second step of calculating, using the reception

signal, matrix data indicating complex amplitude at each time and frequency of the reception signal;
a third step of calculating, using the matrix data, a correlation value between a frequency distribution at first time and a. frequency distribution at second time; and
a fourth step of identifying characteristics of an interference signal using the correlation value.