A method for transmitting a Physical Protocol Data Unit, PPDU, performed by an apparatus in a wireless communication system, comprising: generating a High Efficiency-Short Training Field, HE-STF, field based on a M sequence in a frequency domain throughout a transmission bandwidth of the PPDU; and transmitting the PPDU that includes the HE-STF field, characterized in that : wherein a HES -496,496 sequence is generated by upscaling four times the tone index of the sequence { the M sequence, 0, 0, 0, a, 0, 0, 0, the M sequence, 0, 0, 0, 0, 0, 0, 0, the M sequence, 0, 0, 0, b, 0, 0, 0, the M sequence}, wherein each of the a and the b is selected as any one value among (√1/2)(1+j), (√1/2)(1-j), (√1/2)(-1+j) and (√1/2)(-1-j), wherein the M sequence is generated based on the equation below, - M − 28,28 − 24 : 24 = HTS − 28,28 − 24 : 24 - M − 28,28 − 28 = 1 / 2 − 1 − j - M − 28,28 28 = 1 / 2 1 + j - M − 28,28 0 = 1 / 2 1 + j wherein the HTS -28,28 is defined as the equation below, and HTS − 28,28 = 1 / 2 0 , 0 , 0 , 0,1 + j , 0 , 0,0 , − 1 , − j , 0 , 0 , 0,1 + j , 0 , 0,0 , − 1 − j , 0 , 0,0 , − 1 − j , 0 , 0 , 0,1 + j , 0 , 0,0 , 0 , 0 , 0,0 , − 1 − j , 0 , 0,0 , − 1 − j , 0 , 0 , 0,1 + j , 0 , 0 , 0,1 + j , 0 , 0 , 0,1 + j , 0 , 0 , 0,1 + j , 0 , 0 , 0,0 wherein the HE-STF field is constructed by configuring sixteen zero values in the left side of HES -496,496 , and fifteen zero values are configured in the right side of HES -496,496. generating a High Efficiency-Short Training Field, HE-STF, field based on a M sequence in a frequency domain throughout a transmission bandwidth of the PPDU; and transmitting the PPDU that includes the HE-STF field, characterized in that : wherein a HES -496,496 sequence is generated by upscaling four times the tone index of the sequence { the M sequence, 0, 0, 0, a, 0, 0, 0, the M sequence, 0, 0, 0, 0, 0, 0, 0, the M sequence, 0, 0, 0, b, 0, 0, 0, the M sequence}, wherein each of the a and the b is selected as any one value among (√1/2)(1+j), (√1/2)(1-j), (√1/2)(-1+j) and (√1/2)(-1-j), wherein the M sequence is generated based on the equation below, - M − 28,28 − 24 : 24 = HTS − 28,28 − 24 : 24 - M − 28,28 − 28 = 1 / 2 − 1 − j - M − 28,28 28 = 1 / 2 1 + j - M − 28,28 0 = 1 / 2 1 + j wherein the HTS -28,28 is defined as the equation below, and HTS − 28,28 = 1 / 2 0 , 0 , 0 , 0,1 + j , 0 , 0,0 , − 1 , − j , 0 , 0 , 0,1 + j , 0 , 0,0 , − 1 − j , 0 , 0,0 , − 1 − j , 0 , 0 , 0,1 + j , 0 , 0,0 , 0 , 0 , 0,0 , − 1 − j , 0 , 0,0 , − 1 − j , 0 , 0 , 0,1 + j , 0 , 0 , 0,1 + j , 0 , 0 , 0,1 + j , 0 , 0 , 0,1 + j , 0 , 0 , 0,0 wherein the HE-STF field is constructed by configuring sixteen zero values in the left side of HES -496,496 , and fifteen zero values are configured in the right side of HES -496,496. wherein a HES -496,496 sequence is generated by upscaling four times the tone index of the sequence { the M sequence, 0, 0, 0, a, 0, 0, 0, the M sequence, 0, 0, 0, 0, 0, 0, 0, the M sequence, 0, 0, 0, b, 0, 0, 0, the M sequence}, wherein each of the a and the b is selected as any one value among (√1/2)(1+j), (√1/2)(1-j), (√1/2)(-1+j) and (√1/2)(-1-j), wherein the M sequence is generated based on the equation below, - M − 28,28 − 24 : 24 = HTS − 28,28 − 24 : 24 - M − 28,28 − 28 = 1 / 2 − 1 − j - M − 28,28 28 = 1 / 2 1 + j - M − 28,28 0 = 1 / 2 1 + j wherein the HTS -28,28 is defined as the equation below, and HTS − 28,28 = 1 / 2 0 , 0 , 0 , 0,1 + j , 0 , 0,0 , − 1 , − j , 0 , 0 , 0,1 + j , 0 , 0,0 , − 1 − j , 0 , 0,0 , − 1 − j , 0 , 0 , 0,1 + j , 0 , 0,0 , 0 , 0 , 0,0 , − 1 − j , 0 , 0,0 , − 1 − j , 0 , 0 , 0,1 + j , 0 , 0 , 0,1 + j , 0 , 0 , 0,1 + j , 0 , 0 , 0,1 + j , 0 , 0 , 0,0 wherein the HE-STF field is constructed by configuring sixteen zero values in the left side of HES -496,496 , and fifteen zero values are configured in the right side of HES -496,496. <EOS>