Method and apparatus for receiving ppdu in which data is duplicated and to which phase rotation is applied in wireless lan system

A receiving station (STA) configured to operate in a wireless local area network (WLAN) system, the receiving STA comprising:

• a memory;
• a transceiver;
• and
• a processor being operatively connected to the memory and the transceiver,
• wherein the processor is configured to:
• receive a Physical Protocol Data Unit (PPDU) from a transmitting station (STA), and decode the PPDU,
• wherein the PPDU includes a preamble and a data field,
• wherein for an 80 MHz PPDU, a bandwidth of the PPDU includes a lower 484-tone resource unit (RU) and a higher 484-tone RU,
• wherein the data field includes first data for the lower 484-tone RU and second data for the higher 484-tone RU,
• wherein in the data field, the higher 484-tone RU is a duplicated RU from the lower 484-tone RU along with a partial sign change, and wherein the partial sign change is applied to a lower half frequency domain of the higher 484-tone RU.

A method performed in a wireless local area network (WLAN) system, the method comprising:

• generating, by a transmitting station (STA), a Physical Protocol Data Unit (PPDU);
• and
• transmitting, by the transmitting STA, the PPDU to a receiving STA,
• wherein the PPDU includes a preamble and a data field,
• wherein for an 80 MHz PPDU, a bandwidth of the PPDU includes a lower 484-tone resource unit (RU) and a higher 484-tone RU,
• wherein the data field includes first data for the lower 484-tone RU and second data for the higher 484-tone RU,
• wherein in the data field, the higher 484-tone RU is a duplicated RU from the lower 484-tone RU along with a partial sign change, and wherein the partial sign change is applied to a lower half frequency domain of the higher 484-tone RU.

A transmitting station (STA) configured to operate in a wireless local area network (WLAN) system, the transmitting STA comprising:

• a memory;
• a transceiver;
• and
• a processor being operatively connected to the memory and the transceiver, wherein the processor is configured to:
• generate a Physical Protocol Data Unit (PPDU);
• and
• transmit the PPDU to a receiving STA,
• wherein the PPDU includes a preamble and a data field,
• wherein for an 80 MHz PPDU, a bandwidth of the PPDU includes a lower 484-tone resource unit (RU) and a higher 484-tone RU,
• wherein the data field includes first data for the lower 484-tone RU and second data for the higher 484-tone RU,
• wherein in the data field, the higher 484-tone RU is a duplicated RU from the lower 484-tone RU along with a partial sign change, and
• wherein the partial sign change is applied to a lower half frequency domain of the higher 484-tone RU.