Terminal number estimating system, terminal specifying system, terminal number estimating device, terminal number specifying device, and processing method

1. A terminal number estimating system comprising:

a plurality of receivers that receive a wireless signal transmitted from a plurality of terminal devices by frequency-division multiple access;

at least one memory configured to store instructions; and

at least one processor configured execute the instructions to:

perform a discrete Fourier transform on each wireless signal received by the plurality of receivers and outputting a discrete Fourier coefficient; and

estimate a position of each terminal device by clustering a resource block of each wireless signal based on each discrete Fourier coefficient.

2. The terminal specifying system according to claim 1 , wherein the at least one processor is configured execute the instructions to:

estimate a number of the terminal devices based on the estimated position of each terminal device, and specify a number or a width of a resource block of each terminal device;

separate a wireless signal for each terminal device from each wireless signal on which the discrete Fourier transform is performed, based on the number of the terminal devices and the number or the width of the resource block of each terminal device; and

extract a feature from the wireless signal separated for each terminal device and specify each terminal device based on the feature of each wireless signal.

3. A specifying processing device comprising:

at least one memory configured to store instructions; and

at least one processor configured execute the instructions to:

perform a discrete Fourier transform on each wireless signal transmitted from a plurality of terminal devices by frequency-division multiple access and received by a plurality of receivers and output a discrete Fourier coefficient; and

estimate a position of each terminal device by clustering a resource block of each wireless signal based on each discrete Fourier coefficient.

4. The specifying processing device according to claim 3 , wherein the at least one processor is configured execute the instructions to:

estimate a number of the terminal devices based on the estimated position of each terminal device, and specify a number or a width of a resource block of each terminal device;

separate a wireless signal for each terminal device from each wireless signal on which the discrete Fourier transform is performed, based on the number of the terminal devices and the number or the width of the resource block of each terminal device; and

extract a feature from the wireless signal separated for each terminal device and specify each terminal device based on the feature of each wireless signal.

5. A processing method comprising:

receiving, by a plurality of receivers, a wireless signal transmitted from a plurality of terminal devices by frequency-division multiple access;

performing a discrete Fourier transform on each wireless signal received by the plurality of receivers and outputting a discrete Fourier coefficient; and

estimating a position of each terminal device by clustering a resource block of each wireless signal based on each discrete Fourier coefficient.

6. The processing method according to claim 5 , comprising:

outputting a number of the terminal device and a number or a width of a resource block of each terminal device, based on the estimated position of each terminal device by the clustering;

separating a wireless signal for each terminal device from each wireless signal on which the discrete Fourier transform is performed, based on the number of the terminal devices and the number or the width of the resource block of each terminal device;

extracting a feature from the wireless signal separated for each terminal device; and

specifying each terminal device based on the feature of each wireless signal.