Wireless communication device

A wireless communication device comprising:

• a circuitry configured to
• communicate wirelessly with a plurality of slave stations under control;
• control data transmission with each of the slave stations;
• control the wireless communication device serving as a master station to perform multicast transmission to the plurality of slave stations;
• specify, in an acknowledgement request frame, two or more slave stations selected from the plurality of slave stations transmitting respective acknowledgement responses and a transmission scheme of the respective acknowledgement responses;
• transmit the acknowledgement request frame that requests the respective acknowledgement responses for the multicast transmission from the two or more of the plurality of slave stations;
• receive the respective acknowledgement responses simultaneously transmitted from the two or more of the plurality of slave stations;
• acquire information on each of respective propagation paths between each of the two or more of the plurality of slave stations and the wireless communication device from each of training signals simultaneously transmitted from each of the two or more of the plurality of slave stations in accordance with an encoding scheme;
• and
• separate the respective acknowledgement responses received simultaneously from the two or more of the plurality of slave stations on a basis of the information on the respective propagation paths between the two or more of the plurality of slave stations and the wireless communication device,
• wherein the transmission scheme includes the encoding scheme of the training signals for the plurality of acknowledgement responses to be separated, the training signals being encoded orthogonal to each other in accordance with the encoding scheme and transmitted simultaneously, each of the training signals being included in each response frame together with each of the acknowledgement responses.