Method of transmitting secret information at transmitting end and method of receiving secret information at receiving end, based on MIMO multiplexing using antennas

A method of receiving secret information at a receiving device, based on multi-input multi-output (MIMO) multiplexing using antennas, the method comprising:

• determining layer mapping rules used to map a plurality of indices of the secret information to a plurality of information vectors;
• transmitting the layer mapping rules to a transmitting device;
• selecting a receiving antenna, among receiving antennas, based on a strength of signals received through the receiving antennas, the selected antenna corresponding to a selected index among the plurality of indices;
• detecting an information vector among the plurality of information vectors from the signal received through the selected receiving antenna, wherein, based on the layer mapping rules,
• the detected information vector includes an information symbol that is set to a first value and mapped to the selected receiving antenna, and
• the detected information vector includes a remaining information symbol that is set to a second value and mapped to a respective remaining receiving antenna among the receiving antennas that corresponds to one or more remaining indices among the plurality of indices;
• demapping the detected information vector to the selected index;
• and
• combining the selected index and the one or more remaining indices.

A transmitting device configured to transmit secret information based on multi-input multi-output (MIMO) multiplexing using antennas, the transmitting device comprising:

• a selecting unit configured to select an index of the secret information that corresponds to a receiving antenna among receiving antennas;
• a mapping unit configured to map the index to an information vector based on layer mapping rules, by
• setting, to a first value, an information symbol of the information vector that is mapped to the receiving antenna corresponding to the selected index;
• and
• setting, to a second value, a remaining information symbol of the information vector that is mapped to a respective remaining receiving antenna among the receiving antennas that corresponds to one or more remaining indices of the secret information;
• a precoding unit configured to precode the information vector based on channel information between transmitting antennas and the receiving antennas;
• and
• a beamforming unit configured to beamform the precoded information vector, using the transmitting antennas.

A receiving device configured to receive secret information based on multi-input multi-output (MIMO) multiplexing using antennas, the receiving device comprising:

• a layer mapping rule determining unit configured to determine layer mapping rules used to map a plurality of indices of the secret information to a plurality of information vectors;
• a layer mapping rule transmitting unit configured to transmit the layer mapping rules to a transmitting device;
• a selecting unit configured to select a receiving antenna from receiving antennas based on a strength of a signal received through each of the receiving antennas, the selected antenna corresponding to a selected index among the plurality of indices;
• a detecting unit configured to detect an information vector among the plurality of information vectors from the signal received through the selected receiving antenna, wherein, based on the layer mapping rules,
• the detected information vector includes an information symbol that is set to a first value and mapped to the selected receiving antenna, and
• the detected information vector includes a remaining information symbol that is set to a second value and mapped to a respective remaining receiving antenna among the receiving antennas that corresponds to one or more remaining indices among the plurality of indices;
• a demapping unit configured to demap the detected information vector to the selected index;
• and
• a combination unit configured to combine the selected index and the one or more remaining indices of the secret information.