Dynamic space division duplex (SDD) wireless communications with multiple antennas using self-interference cancellation

A method of providing full-duplex communication in a pre-determined frequency band using a wireless communication unit having a plurality of antennas, the method comprising the steps of:

• the wireless unit receiving one or more receive data streams in the pre-determined frequency band utilizing a first subset of the plurality of antennas, wherein the first subset includes at least one antenna from the plurality of antennas as a receive antenna;
• the wireless unit simultaneously transmitting one or more transmit data streams in the pre-determined frequency band utilizing a second subset of the plurality of antennas, wherein the second subset includes less than or equal to a total number of antennas in the plurality of antennas as transmit antennas, wherein at least one antenna is shared for simultaneous transmission and reception;
• the wireless unit determining a Self-Interference Cancelling (SIC) precoder based on a null space of an estimate of a Self-Interference (SI) channel matrix for the predetermined frequency band;
• and
• based on the determined SIC precoder, the wireless unit adjusting relative amplitudes and relative phases of radio signals carrying the transmit data streams that are transmitted through the transmit antennas in the pre-determined frequency band such that destructive interference reduces a magnitude of the radio signals received at each receive antenna when transmitting in the pre-determined frequency band.