Data Processing Method and Data Processing Apparatus

A data processing apparatus, comprising:

• a transceiver configured to receive, from a transmitter, a symbol set that is based on a plurality of data frames after channel transmission, wherein the plurality of data frames are sent by a transmitter, wherein in a polarization direction, the data frame comprises N symbols, every M consecutive symbols of the N symbols comprise one pilot symbol at a fixed location and M−1 payload symbols, N=M×Q, Q is an even number, M is an integer greater than or equal to 1, wherein the symbol set comprises R symbol subsets, wherein each of the symbol subsets comprises W symbols, R is an integer greater than 1, and wherein W is an integer greater than or equal to 1;
• a processor configured to:
• perform differential processing on the R symbol subsets to obtain R differential symbol subsets;
• obtain a pilot sequence comprising Z pilot symbols, wherein 2≤Z≤Q, wherein the Z first pilot symbols in the pilot sequence are in one-to-one correspondence with Z second pilot symbols in a data frame, wherein any one of the Z first pilot symbols is c times a corresponding one of the Z second pilot symbols, and wherein c is not equal to 0;
• perform differential processing on the pilot sequence to obtain a differential pilot sequence;
• and
• determine a frame start location in the symbol set based on the R differential symbol subsets and the differential pilot sequence.