Patent ID: 11881970
Assignee: NEC CORPORATION
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 9:
10. The radio wave feature value computation method according to claim 7, wherein
the fixed signal includes a single signal pattern that is repeated a plurality of times in the information-1 section and a single signal pattern that is repeated a plurality of times in the information-2 section,
the information-1 section signal processing includes:
clipping two cycles of a first information-1 section and a second information-1 section from a single signal pattern that is repeated a plurality of times in the information-1 section; and
performing Fourier transform on a signal of the first information-1 section and performing Fourier transform on a signal of the second information-1 section,

the information-2 section signal processing includes:
clipping two cycles of a first information-2 section and a second information-2 section from a single signal pattern that is repeated a plurality of times in the information-2 section; and
performing Fourier transform on a signal of the first information-2 section and to performing Fourier transform on a signal of the second information-2 section,

computing the average value includes:
computing a first feature value by dividing, for each frequency bin, the Fourier-transformed first information-1 section by the Fourier-transformed first information-2 section;
computing a second feature value by dividing, for each frequency bin, the Fourier-transformed second information-1 section by the Fourier-transformed second information-2 section; and
computing, for each frequency bin, an average between the first feature value and the second feature value and outputting the computed average as the feature value, and

a signal length of the first information-1 section, a signal length of the second information-1 section, a signal length of the first information-2 section, and a signal length of the second information-2 section are equal to one another.