include information on the mcs modulation and coding scheme for each sta and information on rate matching further the vht sigb field 470 may include information indicating a psdu length included in the data field for each sta the information indicating the length of the psdu is information indicative of the length of the bit sequence of the psdu and may perform the indication on a per octet basis meanwhile in case the ppdu is su transmitted information on the mcs is included in the vht siga field 440 so that it may not be included in the vht sigb field 470 the size of the vht sigb field 470 may vary depending on the type mu mimo or su mimo of mimo transmission and the channel bandwidth used for transmission of the ppdu the data field 480 includes data that is intended to be transmitted to an sta the data field 480 a psdu plcp service data unit where an mpdu mac protocol data unit is transferred in the mac layer a service field for initializing a scrambler a tail field including a bit sequence necessary for turning the convolution encoder back into a zero state and padding bits for standardizing the length of the data field in the case of mu transmission each data unit intended to be transmitted may be included in the data field 480 transmitted to each sta the data unit may be an a mpdu aggregate mpdu the fields included in each ppdu format shown in fig3 and 4 may be transmitted as ofdm.