Method and device for transmitting training field in wireless LAN

A transmitting station (STA) in a wireless local area network (LAN), the transmitting STA comprising:

• a transceiver configured to transmit and/or receive radio signals;
• and
• a processor being operatively connected to the transceiver,
• wherein the processor is configured to:
• generate a physical protocol data unit (PPDU) including a training field,
• wherein the training field is generated based on a training sequence,
• wherein the training sequence is determined based on S20 MHz=[05,C52,D12,C52,D12,C52,D12,C52,07] for a 20 MHz bandwidth,
• wherein a sequence subset 05 is determined based on five consecutive zeros and a sequence subset 07 is determined based on seven consecutive zeros,
• wherein a sequence subset C52 is determined based on
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• wherein a sequence subset D12 is determined based on D12={0,0,0,1+j,0,0,0,−1−j, 0,0,0,−1−j}, and
• transmit the PPDU to a plurality of receiving STAs based on orthogonal frequency division multiple access (OFDMA).