Method and device for receiving PPDU through broadband in wireless LAN system

A receiving station (STA) in a wireless LAN system, the receiving STA comprising:

• a memory;
• a transceiver;
• and
• a processor combined operatively with the memory and the transceiver, wherein the processor is configured to:
• receive a Physical Protocol Data Unit (PPDU) from a transmitting STA through a broadband;
• and
• decode the PPDU,
• wherein the broadband is a 320 MHz band or a 160+160 MHz band,
• the PPDU includes a first field and a second field,
• the first field includes a Legacy-Long Training Field (L-LTF),
• the first field is generated based on a first phase rotation value or a second phase rotation value,
• the first phase rotation value is generated based on a third phase rotation value and a fourth phase rotation value,
• the third phase rotation value is obtained by repeating a phase rotation value for an 80 MHz band defined in the 802.11ax wireless LAN system,
• the fourth phase rotation value is a phase rotation value defined in units of 80 MHz bands based on optimal Peak-to-Average Power Ratio (PAPR) of the L-LTF,
• the optimal PAPR of the L-LTF is obtained based on a preamble puncturing pattern and a combination of Radio Frequencies (RFs) used when the PPDU are transmitted,
• the preamble puncturing pattern includes all patterns of a band in which a 20 MHz band is punctured in the 320 MHz band or the 160+160 MHz band, and
• the combination of RFs combines an RF with 160 MHz capability or an RF with 320 MHz capability.

A method in a wireless LAN system, the method comprising:

• generating a Physical Protocol Data Unit (PPDU) by a transmitting station (STA);
• and
• transmitting the PPDU to a receiving STA by the transmitting STA through a broadband,
• wherein the broadband is a 320 MHz band or a 160+160 MHz band,
• the PPDU includes a first field and a second field,
• the first field includes a Legacy-Long Training Field (L-LTF),
• the first field is generated based on a first phase rotation value or a second phase rotation value,
• the first phase rotation value is generated based on a third phase rotation value and a fourth phase rotation value,
• the third phase rotation value is obtained by repeating a phase rotation value for an 80 MHz band defined in the 802.11ax wireless LAN system,
• the fourth phase rotation value is a phase rotation value defined in units of 80 MHz bands based on optimal Peak-to-Average Power Ratio (PAPR) of the L-LTF,
• the optimal PAPR of the L-LTF is obtained based on a preamble puncturing pattern and a combination of Radio Frequencies (RFs) used when the PPDU are transmitted,
• the preamble puncturing pattern includes all patterns of a band in which a 20 MHz band is punctured in the 320 MHz band or the 160+160 MHz band, and
• the combination of RFs combines an RF with 160 MHz capability or an RF with 320 MHz capability.