Method for transmitting and receiving signal in wireless lan system and apparatus therefor

A station device supporting a plurality of space time streams (STSs) in a wireless LAN (WLAN) system, the station device comprising:

• a transceiver unit having at least one radio frequency (RF) chain and configured to transmit and receive a signal to and from another station device;
• and
• a processor connected to the transceiver unit and processing the signal transmitted to or received from the other station device,
• wherein the processor is configured to:
• generate a first pilot sequence related with 36 subcarriers for two bonded channels based on a second pilot sequence related with 12 subcarriers, wherein the second pilot sequence is set to one sequence among a plurality of second pilot sequences for the plurality of STSs, wherein the plurality of the second pilot sequences are mutually orthogonal, wherein a maximum number of the STSs supported by the station device is eight;
• and
• transmit, to the another station device, a signal including the first pilot sequence through the two bonded channels.