Pre-coding method for removing interference in full duplex communication, and base station and user terminal for performing same

A base station of a full-duplex type for removing signal interference between an uplink terminal and a downlink terminal of a half-duplex type, the base station comprising:

• a code assignment unit configured to assign a first code to the uplink terminal and assign a second code orthogonal to the first code to the downlink terminal;
• and
• an orthogonal code provision unit configured to provide an orthogonal code including the first code and the second code to a user terminal operating as the uplink terminal or the downlink terminal during scheduling,
• wherein the uplink terminal uses the first code to generate a transmission signal and transmits the transmission signal, and
• the downlink terminal uses the second code to remove the transmission signal of the uplink terminal including the first code received as an interference signal when receiving a signal from the base station.

A pre-coding method of removing signal interference between an uplink terminal and a downlink terminal of a half-duplex type, the pre-coding method performed by a base station of a full-duplex type, the pre-coding method comprising:

• (a) estimating channel coefficients between the base station and uplink terminals and downlink terminals;
• (b) generating a reception pre-coding matrix based on a first code and a channel to the uplink terminal;
• and
• (c) generating a transmission pre-coding matrix based on a second code and a channel to the downlink terminal,
• wherein the first code is used in generating a transmission signal of the uplink terminal, and
• the second code is used for removing the transmission signal of the uplink terminal including the first code received as an interference signal when the downlink terminal receives a signal from the base station.

A user terminal configured to transmit signals by way of half-duplex communication, the user terminal comprising:

• a signal generation unit configured to generate a signal for transmitting to a full-duplex type base station by applying a first code assigned from among orthogonal codes for removing signal interference;
• and
• a signal transmission unit configured to transmit the generated signal in time slots of a number corresponding to a length of the first code or by using sub-carriers of a number corresponding to a length of the first code,
• wherein a second code from among the orthogonal codes is assigned to a downlink terminal receiving a signal by way of half-duplex communication from the base station, the first code is orthogonal to the second code to be used in removing the signal transmitted from the downlink terminal to the base station and received as an interference signal, and
• the signal transmission unit transmits the generated signal in the time slots in a time domain and by using the sub-carriers in a frequency domain.