Data transmission apparatus and method using polarized antenna in wireless av system

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

• multiple dual polarization antennas each operating as two different poles;
• a communication circuit performing multiple input multiple output (MIMO) beamforming during a data transmission interval (DTI) within a beacon interval (BI), receiving each of multiple training fields (TRNs) being generated based on different orthogonal sequences, from a data transmitting device, through each corresponding dual polarization antenna, and receiving a physical layer protocol data unit (PPDU) frame from the data transmitting device, based on the MIMO beamforming;
• and
• a processor being operatively connected to the communication circuit and being configured to recover AV data being transmitted through the PPDU frame,
• wherein the communication circuit performs polarization alignment for the multiple dual polarization antennas based on the multiple training fields and calculates polarization alignment values related to each of the multiple dual polarization antennas,
• wherein the multiple training fields are received by being included in an enhanced directional multi-gigabit (EDMG) beam refinement protocol-reception (BRP-RX) packet as receive training fields (TRN-Rs), and
• wherein the polarization alignment is performed in a MIMO BRP receive sector sweep (RXSS) phase.