Method and device for generating stf signal in wireless lan system

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

• a memory;
• a transceiver;
• and
• a processor operatively coupled to the memory and the transceiver, wherein the processor is configured to:
• generate an extremely high throughput (EHT) physical protocol data unit (PPDU) including a short training field (STF) signal;
• and
• transmit the EHT PPDU to a receiving STA through a 320 MHz band or a 160+160 MHz band,
• wherein the STF signal is generated based on an EHT STF sequence for the 320 MHz band or the 160+160 MHz band,
• wherein the EHT STF sequence for the 320 MHz band is a first sequence in which a pre-set M sequence is repeated, and is defined as follows
• {M 1 −M 0 −M 1 −M 0 −M −1 M 0 −M 1−M 0 −M −1 M 0 M −1 M 0 −M −1 M 0 −M 1 −M}*(1+j)/sqrt(2),
• where sqrt( ) denotes a square root, and
• wherein the pre-set M sequence is defined as follows
• {M=1−1,−1,−1,1,1,1,−1,1,1,1,−1,1,1,−1,1}.

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

• receiving, by a receiving station (STA), an extremely high throughput (EHT) physical protocol data unit (PPDU) including a short training field (STF) signal through a 320 MHz band or a 160+160 MHz band;
• and
• decoding, by the receiving STA, the EHT PPDU,
• wherein the STF signal is generated based on an EHT STF sequence for the 320 MHz band or the 160+160 MHz band,
• wherein the EHT STF sequence for the 320 MHz band is a first sequence in which a pre-set M sequence is repeated, and is defined as follows
• {M 1 −M 0 −M 1 −M 0 −M −1 M 0 −M 1 −M 0 −M −1 M 0 M −1 M 0 −M −1 M 0 −M 1 −M}*(1+j)/sqrt(2),
• where sqrt( ) denotes a square root, and
• wherein the pre-set M sequence is defined as follows
• {M −1,−1,−1,1,1,1,−1,1,1,1,−1,1,1,−1,1}.