A data transmission method performed by a transmit end device, the transmit end device comprising a channel encoder, an interleaver, a first modulator, a second modulator, a third modulator, a fourth modulator, and a transmitter, the method comprising the steps of: • generating (step 201) a preamble comprising a high efficiency signal, HE-SIG, field, wherein the HE-SIG field comprises at least four symbols comprising a first orthogonal frequency division multiplexing, OFDM, symbol, a second OFDM symbol, a third OFDM symbol and a fourth OFDM symbol, wherein input information bits of the first OFDM symbol are the same as input information bits of the second OFDM symbol, input information bits of the third OFDM symbol are the same as input information bits of the fourth OFDM symbol, wherein the input information bits of the third and fourth OFDM symbols include a part of or all left information bits except the input information bits of the first and second OFDM symbols among information bits that need to be carried in the HE-SIG field; wherein the generating the preamble comprises generating the at least four symbols, wherein the generating the at least four symbols comprises: ∘ obtaining the first OFDM symbol by processing the input information bits of the first OFDM symbol using the channel encoder, the interleaver, and the first modulator; ∘ obtaining the second OFDM symbol by processing the input information bits of the second OFDM symbol using the channel encoder, without an interleaver, and further using the second modulator; ∘ obtaining the third OFDM symbol by processing the input information bits of the third OFDM symbol using the channel encoder, the interleaver, and the third modulator; and ∘ obtaining the fourth OFDM symbol by processing the input information bits of the fourth OFDM symbol using the channel encoder, without an interleaver, and further using the fourth modulator, • sending (step 202), by using the transmitter, the preamble to a receive end device. • generating (step 201) a preamble comprising a high efficiency signal, HE-SIG, field, wherein the HE-SIG field comprises at least four symbols comprising a first orthogonal frequency division multiplexing, OFDM, symbol, a second OFDM symbol, a third OFDM symbol and a fourth OFDM symbol, wherein input information bits of the first OFDM symbol are the same as input information bits of the second OFDM symbol, input information bits of the third OFDM symbol are the same as input information bits of the fourth OFDM symbol, wherein the input information bits of the third and fourth OFDM symbols include a part of or all left information bits except the input information bits of the first and second OFDM symbols among information bits that need to be carried in the HE-SIG field; wherein the generating the preamble comprises generating the at least four symbols, wherein the generating the at least four symbols comprises: ∘ obtaining the first OFDM symbol by processing the input information bits of the first OFDM symbol using the channel encoder, the interleaver, and the first modulator; ∘ obtaining the second OFDM symbol by processing the input information bits of the second OFDM symbol using the channel encoder, without an interleaver, and further using the second modulator; ∘ obtaining the third OFDM symbol by processing the input information bits of the third OFDM symbol using the channel encoder, the interleaver, and the third modulator; and ∘ obtaining the fourth OFDM symbol by processing the input information bits of the fourth OFDM symbol using the channel encoder, without an interleaver, and further using the fourth modulator, ∘ obtaining the first OFDM symbol by processing the input information bits of the first OFDM symbol using the channel encoder, the interleaver, and the first modulator; ∘ obtaining the second OFDM symbol by processing the input information bits of the second OFDM symbol using the channel encoder, without an interleaver, and further using the second modulator; ∘ obtaining the third OFDM symbol by processing the input information bits of the third OFDM symbol using the channel encoder, the interleaver, and the third modulator; and ∘ obtaining the fourth OFDM symbol by processing the input information bits of the fourth OFDM symbol using the channel encoder, without an interleaver, and further using the fourth modulator, • sending (step 202), by using the transmitter, the preamble to a receive end device.