Apparatus and method for performing beamforming using multiple antennas in wireless AV system

A wireless data transmitting device in a wireless audio/video (AV) system, the device comprising:

• a plurality of transmit antennas;
• a communication circuit which performs a multiple input multiple output (MIMO) beamforming procedure based on an individual transmit (Tx) sector sweep for each of the plurality of transmit antennas during a data transmission interval (DTI) within a beacon interval (BI), and transmits a physical layer protocol data unit (PPDU) frame to a wireless data receiving device through the plurality of transmit antennas;
• and
• a processor coupled with the communication circuit and configured to generate AV data to be transmitted through the PPDU frame and provide the AV data to the communication circuit,
• wherein the MIMO beamforming procedure includes an individual receive (Rx) sector sweep for each of a plurality of receive antennas included in the wireless data receiving device,
• wherein the communication circuit derives K candidate Tx sectors for each of the transmit antennas as a result of the individual Tx sector sweep, and derives J candidate Rx sectors for each of the receive antennas as a result of the individual Rx sector sweep,
• wherein the MIMO beamforming procedure further includes a single user (SU)-MIMO procedure, and
• wherein the SU-MIMO procedure determines an optimal Tx-Rx sector combination from the K candidate Tx sectors and the J candidate Rx sectors.