Pilot transmission method and data transmission apparatus in wireless local area network

A pilot transmission method in a wireless local area network, the method comprising:

• receiving a pilot signal of each spatial flow on M subcarriers in N consecutive symbol periods separately, wherein the pilot signal is sent by a transmit end, the pilot signal of each spatial flow is generated by the transmit end by applying a pilot matrix to a long training field (LTF), and the pilot matrix comprises:
• a pilot sequence that includes a pilot coefficient of each of the spatial flows on the M subcarriers in the N consecutive symbol periods, and wherein the pilot matrix is an orthogonal matrix, N is a positive integer greater than or equal to L, L is a quantity of spatial flows in the wireless local area network, and M is a positive integer multiple of L;
• and
• calculating a phase deviation between a transmit antenna and a receive antenna corresponding to each spatial flow at the transmit end with reference to the pilot signal of each spatial flow at the transmit end.

A data transmission apparatus, comprising:

• a processing module, configured to apply a pilot matrix to a long training field (LTF) to generate a pilot signal, wherein the pilot matrix comprises:
• a matrix formed from pilot sequences each having a pilot coefficient of each of the spatial flows, and wherein the spatial flow is on M subcarriers in N consecutive symbol periods, the pilot matrix is an orthogonal matrix, N is a positive integer greater than or equal to L, L is a quantity of spatial flows in a wireless local area network, and M is a positive integer multiple of L;
• and
• a transceiver module, configured to send the pilot signal on the M subcarriers.

A data transmission apparatus, comprising:

• a transceiver module, configured to receive a pilot signal of each spatial flow on M subcarriers in N consecutive symbol periods separately, wherein the pilot signal is sent by a transmit end, the pilot signal of each spatial flow is a pilot signal generated by the transmit end by applying a pilot matrix to a long training field LTF, the pilot matrix comprises:
• a pilot sequence that includes a pilot coefficient of each of the spatial flows on the M subcarriers in the N consecutive symbol periods, and wherein the pilot matrix is an orthogonal matrix, N is a positive integer greater than or equal to L, L is a quantity of spatial flows in a wireless local area network, and M is a positive integer multiple of L;
• and
• a processing module, configured to calculate a phase deviation between a transmit antenna and a receive antenna corresponding to each spatial flow at the transmit end with reference to the pilot signal of each spatial flow at the transmit end.