A signal processing method, wherein the method is applied to an orthogonal frequency division multiplexing, OFDM, wireless transmission system, the system comprises at least two OFDM symbols, and the method comprises: dividing, by a transmitter, the first OFDM symbol of the at least two OFDM symbols into F parts, wherein F ≥ 2; adding, by the transmitter, a zero power padding, ZP, to a tail end of divided data of each part obtained after dividing the first OFDM symbol of the at least two OFDM symbols; adding, by the transmitter, data of N w ƒ consecutive points at a head end of divided data of a part f + 1 obtained after dividing the first OFDM symbol of the at least two OFDM symbols to a start location in a ZP at a tail end of divided data of a part f, so that the data of the N w ƒ points is used as a suffix of the divided data of the part f; and adding data of N w F − 1 consecutive points at a head end of divided data of a part 0 to a start location in a ZP at a tail end of divided data of a part F - 1, so that the data of the N w F − 1 points is used as a suffix of the divided data of the part F - 1, wherein 0 ≤ f < F; and performing, by the transmitter, point multiplication processing with symmetric time domain window function on the data of the N w ƒ consecutive points at the head end of the divided data of the part f + 1 and the data of the N w ƒ points in the suffix at the tail end of the divided data of the part f, so that the sum of the point coefficients corresponding to the symmetric window function is 1; and performing point multiplication processing with symmetric time domain window function on the data of the N w F − 1 consecutive points at the head end of the divided data of the part 0 and the data of the N w F − 1 points in the suffix at the tail end of the divided data of the part F - 1, so that the sum of the point coefficients corresponding to the symmetric window function is 1. dividing, by a transmitter, the first OFDM symbol of the at least two OFDM symbols into F parts, wherein F ≥ 2; adding, by the transmitter, a zero power padding, ZP, to a tail end of divided data of each part obtained after dividing the first OFDM symbol of the at least two OFDM symbols; adding, by the transmitter, data of N w ƒ consecutive points at a head end of divided data of a part f + 1 obtained after dividing the first OFDM symbol of the at least two OFDM symbols to a start location in a ZP at a tail end of divided data of a part f, so that the data of the N w ƒ points is used as a suffix of the divided data of the part f; and adding data of N w F − 1 consecutive points at a head end of divided data of a part 0 to a start location in a ZP at a tail end of divided data of a part F - 1, so that the data of the N w F − 1 points is used as a suffix of the divided data of the part F - 1, wherein 0 ≤ f < F; and performing, by the transmitter, point multiplication processing with symmetric time domain window function on the data of the N w ƒ consecutive points at the head end of the divided data of the part f + 1 and the data of the N w ƒ points in the suffix at the tail end of the divided data of the part f, so that the sum of the point coefficients corresponding to the symmetric window function is 1; and performing point multiplication processing with symmetric time domain window function on the data of the N w F − 1 consecutive points at the head end of the divided data of the part 0 and the data of the N w F − 1 points in the suffix at the tail end of the divided data of the part F - 1, so that the sum of the point coefficients corresponding to the symmetric window function is 1.