OFDM-based data transmission method and apparatus

An OFDM-based data transmission method, comprising:

• receiving, by a receiving device, a data packet sent by a transmitting device, wherein the data packet comprises at least one orthogonal frequency division multiplexing (OFDM) symbol, wherein the OFDM symbol comprises N sequentially numbered subcarriers, the N subcarriers are divided into L subblocks, each subblock of the L subblocks comprises └N/L┘ subcarriers including M pilot subcarriers, start subcarriers of adjacent subblocks are adjacently numbered subcarriers, and a numbering interval is the same for adjacent subcarriers in each subblock of the L subblocks;
• and each subblock of the L subblocks corresponds to one phase rotation signal, and signals carried on the subcarriers in each subblock of the L subblocks are signals obtained by multiplying original signals by a corresponding phase rotation signal, wherein N is an even number, L is a positive integer, └N/L┘ is a positive integer, and M is a positive integer less than └N/L┘;
• obtaining, by the receiving device and according to signals carried on pilot subcarriers in the L subblocks, a product of the phase rotation signal corresponding to each subblock of the L subblocks and a phase deviation signal;
• obtaining a conjugate signal corresponding to the product of the phase rotation signal corresponding to each subblock of the L subblocks and the phase deviation signal, wherein the phase deviation signal represents a phase deviation between the transmitting device and the receiving device;
• and
• obtaining, by the receiving device and according to the conjugate signal corresponding to each subblock and the signals carried on the subcarriers in each subblock of the L subblocks, original signals carried on the subcarriers in each subblock of the L subblocks.

A transmitting device, comprising:

• at least one signal processor, the at least one signal processor configured to generate a data packet, wherein the data packet comprises at least one orthogonal frequency division multiplexing (OFDM) symbol, wherein the OFDM symbol comprises N sequentially numbered subcarriers, the N subcarriers are divided into L subblocks, each subblock of the L subblocks comprises └N/L┘ subcarriers including M pilot subcarriers, start subcarriers of adjacent subblocks are adjacently numbered subcarriers, and a numbering interval is the same for adjacent subcarriers in each subblock of the L subblocks;
• and each subblock of the L subblocks corresponds to one phase rotation signal, and signals carried on the subcarriers in each subblock of the L subblocks are signals obtained by multiplying original signals by a corresponding phase rotation signal, wherein N is an even number, L is a positive integer, └N/L┘ is a positive integer, and M is a positive integer less than └N/L┘;
• and
• a transmitter, the transmitter configured to send the data packet.