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    • 98. 发明申请
    • WIRELESS COMMUNICATION SYSTEM AND WIRELESS COMMUNICATION METHOD
    • US20220321182A1
    • 2022-10-06
    • US17634207
    • 2019-08-13
    • NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    • Marina NAKANOYosuke FUJINOHiroyuki FUKUMOTOKazunori AKABANE
    • H04B7/0456H04B7/06H04W28/02
    • A plurality of transmit antennas of a radio transmission device and a plurality of receive antennas of a radio reception device are located under the sea that is a line-of-sight environment, wherein the radio transmission device selects a frequency channel to be used based on an index value per frequency channel indicating orthogonality between the transmit and receive antennas defined based on a distance between the transmit and receive antennas and an angle indicating a direction of arrival of a radio signal, an interval between the plurality of transmit antennas, an interval between the plurality of receive antennas, and a modulation scheme, the distance between the transmit and receive antennas and the angle indicating the direction of arrival of the radio signal estimated by the radio reception device, and a desired bit error rate to be predetermined, selects the modulation scheme for providing a maximum transmission capacity per the selected frequency channel, separates transmission data into a plurality of pieces of transmission data the number of which corresponds to the number of frequency channels, modulates each of the plurality of pieces of transmission data separated in accordance with the selected modulation scheme, and outputs a transmission signal obtained by multiplexing, with a multiplexing order, each of the plurality of pieces of transmission data, the multiplexing order indicating the number of transmit antennas of the plurality of transmit antennas to be used.