WIRELESS COMMUNICATION SYSTEM AND DOPPLER SHIFT ESTIMATION METHOD
There is provided a wireless communication system in which a plurality of transmission devices include a transmission unit that transmits a wireless signal, the wireless communication device includes one or more antennas that receive the wireless signals transmitted from the plurality of transmission devices, and a waveform transmission unit that transmits waveform data indicating a waveform of a reception signal received by the one or more antennas to the reception device, the reception device includes a reception unit that receives the waveform data transmitted by the wireless communication device, a signal storage unit that stores the reception signal indicated by the waveform data received by the reception unit, an information conversion unit that converts the reception signal for a predetermined period stored in the signal storage unit into a two-dimensional or higher information matrix, a frame detection unit that detects a head and a frame length of a plurality of frames included in the reception signal for a predetermined period by performing feature amount detection in the two-dimensional or higher information matrix, and an estimation unit that estimates a Doppler shift amount of at least each frame based on the two-dimensional or higher information matrix and a head and a frame length of the plurality of frames.
1 . A wireless communication system comprising a plurality of transmission devices, a moving wireless communication device, and a reception device, wherein
the plurality of transmission devices include a transmitter configured to transmit a wireless signal,
the wireless communication device includes
one or more antennas configured to receive wireless signals transmitted from the plurality of transmission devices, and
a waveform transmitter configured to transmit waveform data indicating a waveform of reception signal received by the one or more antennas to the reception device,
the reception device includes
a receiver configured to receive the waveform data transmitted by the wireless communication device,
a signal storage configured to store reception signals indicated by the waveform data received by the receiver,
an information converter configured to convert the reception signals for a predetermined period stored in the signal storage into a two-dimensional or higher information matrix,
a frame detector configured to detect a head and a frame length of a plurality of frames included in the reception signals for the predetermined period by performing feature amount detection in the two-dimensional or higher information matrix, and
an estimator configured to estimate a Doppler shift amount of at least each frame based on the two-dimensional or higher information matrix and a head and a frame length of the plurality of frames detected by the frame detector.
2 . The wireless communication system according to claim 1 , wherein
the frame detector detects the plurality of frames included in the reception signals for the predetermined period by performing line segment detection in the two-dimensional or higher information matrix.
3 . The wireless communication system according to claim 1 , further comprising:
a classifier configured to classify the plurality of frames detected by the frame detector for each wireless communication scheme based on a detected frame length, an occupied bandwidth obtained by the reception signals, and a used channel; and
a plurality of reception processors configured to perform reception processing according to each wireless communication scheme.
4 . A Doppler shift amount estimation method, which is a frame detection method in a wireless communication system including a plurality of transmission devices, a moving wireless communication device, and a reception device, wherein
each of the plurality of transmission devices transmits a wireless signal,
the wireless communication device transmits, to the reception device, waveform data indicating a waveform of a reception signal received by one or more antennas that receive wireless signals transmitted from the plurality of transmission devices,
the reception device receives the waveform data transmitted by the wireless communication device,
the reception device converts the reception signals for a predetermined period stored in the signal storage that stores the reception signals indicating the received waveform data, into a two-dimensional or higher information matrix,
the reception device detects a head and a frame length of a plurality of frames included in the reception signals for the predetermined period by performing feature amount detection in the two-dimensional or higher information matrix, and
a Doppler shift amount of at least each frame is estimated based on the two-dimensional or higher information matrix and a head and a frame length of the plurality of detected frames.