Method for transmitting signal by using repetitive modulation in wireless lan system and apparatus therefor

A method by which a first station (STA) transmits a signal by using repetitive modulation in a wireless LAN system is disclosed in the present invention. The first STA modulates preamble information and/or data field information of a transmitting wireless frame. In the modulation: the preamble information and/or the data field information are modulated by using one of BPSK, QPSK, and 16-QAM; and respective modulated symbols are repetitively mapped to two or more sub-carriers, wherein the number of repetitions of the respective modulated symbols is at least 3.