Control method of wireless communication system, wireless communication system, transmitting apparatus, and receiving apparatus

A wireless communication system comprises:

• a transmitter comprising a transmitting antenna array comprising a plurality of transmitting antennal components, the transmitter being configured to independently control amplitudes and phases of transmission signals to be transmitted from at least two antenna elements among the plurality of antenna elements;
• and
• a receiver comprising a receiving antenna array comprising a plurality of receiving antennal components, the receiver being configured to independently control amplitudes and phases of received signals to be received at least two antenna elements among the plurality of antenna elements constituting the receiving antenna array, wherein
• the transmitter and the receiver are configured so as to perform an amplitude/phase control process of the transmitting and receiving antenna arrays in cooperation, the amplitude/phase control process comprises:
• obtaining a channel response matrix by performing a training to obtain an optimal antenna weight vector to be applied to the antenna array at least between the transmitter and the receiver;
• performing singular value decomposition to decompose the channel response matrix into a correlation matrix and eigenvalues;
• obtaining a diagonal matrix having square roots of the eigenvalues obtained by the singular-value decomposition as its components;
• obtaining an antenna weight vector to be applied to the antenna array for use in wireless communication between the transmitter and the receiver based on a channel response matrix reconstructed by using a component-replaced diagonal matrix, the component-replaced diagonal matrix being obtained by replacing all but one of diagonal components included in the diagonal matrix with zeros;
• and
• controlling amplitudes and phases of the transmission signals and received signals in accordance with the antenna weight vector.

A wireless communication system comprises:

• a transmitter comprising a transmitting antenna array comprising a plurality of transmitting antennal components, the transmitter being configured to independently control amplitudes and phases of transmission signals to be transmitted from at least two antenna elements among the plurality of antenna elements;
• a receiver comprising a receiving antenna array comprising a plurality of receiving antennal components, the receiver being configured to independently control amplitudes and phases of received signals to be received at least two antenna elements among the plurality of antenna elements constituting the receiving antenna array,
• channel response matrix calculation means for obtaining a channel response matrix by performing a training to obtain an optimal antenna weight vector to be applied to the antenna array at least between the transmitter and the receiver;
• singular-value decomposition means for decomposing the channel response matrix into a correlation matrix and eigenvalues;
• and
• amplitude/phase control means for obtaining a diagonal matrix having square roots of the eigenvalues obtained by the singular-value decomposition means as its components, replacing all but one of diagonal components included in the diagonal matrix with zeros, obtaining an antenna weight vector to be applied to the antenna array for use in wireless communication between the transmitter and the receiver based on a channel response matrix reconstructed by using the component-replaced diagonal matrix, and controlling amplitudes and phases of the transmission signals and received signals in accordance with its result.