A radio communication system comprising: a transmitter (201 - 205); and a receiver (301 - 304), wherein the transmitter (201 - 205) is configured to transmit M types of independent rotating polarizations at the same time, the receiver (301 - 304) is configured to receive N types of independent rotating polarizations at the same time, and M ≤ N, where M is a natural number and N is a natural number of 2 or more, and M data are transmitted and received, wherein the transmitter (201 - 205) is configured to transmit, during measurement of a propagation path, known information by transmitting the M types of independent rotating polarizations, and the receiver (301 - 304) is configured to receive, during the measurement of the propagation path, the N types of independent rotating polarizations for each of the M types of independent rotating polarizations at the same time and to evaluate communication quality, and the receiver (301 - 304) is configured to exclude, during information communication, when receiving data transmitted with one of the M types of independent rotating polarizations, an influence of a specific rotating polarization among the N types of independent rotating polarizations based on the evaluation of communication quality to restore the data, wherein the receiver (301 - 304) is configured to store, during the measurement of the propagation path, a received signal of the known information received for each polarization, and the receiver (301 - 304) is configured to simultaneously receive, during the information communication, the M types of independent rotating polarizations transmitted by the transmitter as the N types of independent rotating polarizations, and to restore the M data based on the received signal of the known information. the transmitter (201 - 205) is configured to transmit M types of independent rotating polarizations at the same time, the receiver (301 - 304) is configured to receive N types of independent rotating polarizations at the same time, and M ≤ N, where M is a natural number and N is a natural number of 2 or more, and M data are transmitted and received, wherein the transmitter (201 - 205) is configured to transmit, during measurement of a propagation path, known information by transmitting the M types of independent rotating polarizations, and the receiver (301 - 304) is configured to receive, during the measurement of the propagation path, the N types of independent rotating polarizations for each of the M types of independent rotating polarizations at the same time and to evaluate communication quality, and the receiver (301 - 304) is configured to exclude, during information communication, when receiving data transmitted with one of the M types of independent rotating polarizations, an influence of a specific rotating polarization among the N types of independent rotating polarizations based on the evaluation of communication quality to restore the data, wherein the receiver (301 - 304) is configured to store, during the measurement of the propagation path, a received signal of the known information received for each polarization, and the receiver (301 - 304) is configured to simultaneously receive, during the information communication, the M types of independent rotating polarizations transmitted by the transmitter as the N types of independent rotating polarizations, and to restore the M data based on the received signal of the known information. <EOS>