A computer-implemented symbol processing method, comprising: obtaining a plurality of complex-valued symbols; dividing the plurality of complex-valued symbols into a plurality of sets, wherein each set corresponds to one transmitted symbol; and performing a copy operation on the plurality of sets, so that two sets corresponding to two transmitted symbols that are consecutive in time domain have some same complex-valued symbols, wherein the plurality of sets comprise a first set corresponding to a first transmitted symbol and a second set corresponding to a second transmitted symbol, the first transmitted symbol and the second transmitted symbol are consecutive in time domain, and the first transmitted symbol is located before the second transmitted symbol; and the performing a copy operation on the plurality of sets comprises: performing a first copy operation on the first set and the second set, so that both the first set and the second set have first complex-valued symbols, an end location of a first subset consisting of the first complex-valued symbols in the first set corresponds to a first reference point of the first transmitted symbol, and an end location of a second subset consisting of the first complex-valued symbols in the second set corresponds to a second reference point of the second transmitted symbol, wherein the first reference point represents an end location of a transmitted symbol, and the second reference point represents a location from which a cyclic prefix is obtained through truncation in a transmitted symbol, and wherein the cyclic prefix is added based on the sets obtained through the copy operation. obtaining a plurality of complex-valued symbols; dividing the plurality of complex-valued symbols into a plurality of sets, wherein each set corresponds to one transmitted symbol; and performing a copy operation on the plurality of sets, so that two sets corresponding to two transmitted symbols that are consecutive in time domain have some same complex-valued symbols, wherein the plurality of sets comprise a first set corresponding to a first transmitted symbol and a second set corresponding to a second transmitted symbol, the first transmitted symbol and the second transmitted symbol are consecutive in time domain, and the first transmitted symbol is located before the second transmitted symbol; and the performing a copy operation on the plurality of sets comprises: performing a first copy operation on the first set and the second set, so that both the first set and the second set have first complex-valued symbols, an end location of a first subset consisting of the first complex-valued symbols in the first set corresponds to a first reference point of the first transmitted symbol, and an end location of a second subset consisting of the first complex-valued symbols in the second set corresponds to a second reference point of the second transmitted symbol, wherein the first reference point represents an end location of a transmitted symbol, and the second reference point represents a location from which a cyclic prefix is obtained through truncation in a transmitted symbol, and wherein the cyclic prefix is added based on the sets obtained through the copy operation. performing a first copy operation on the first set and the second set, so that both the first set and the second set have first complex-valued symbols, an end location of a first subset consisting of the first complex-valued symbols in the first set corresponds to a first reference point of the first transmitted symbol, and an end location of a second subset consisting of the first complex-valued symbols in the second set corresponds to a second reference point of the second transmitted symbol, wherein the first reference point represents an end location of a transmitted symbol, and the second reference point represents a location from which a cyclic prefix is obtained through truncation in a transmitted symbol, and wherein the cyclic prefix is added based on the sets obtained through the copy operation.