Abstract: An information mapping method includes mapping, by a transmitting end device, first information to second information on a delay-Doppler frame. The delay-Doppler frame includes M×N grids, M is the total number of delay indexes, N is the total number of Doppler indexes. The delay-Doppler frame includes at least two subframes, and each subframe includes a first guard interval portion, a first mapping portion, and two second mapping portions. The two second mapping portions occupy grids corresponding to kmax Doppler indexes at a head and a tail of the subframe in a Doppler direction, and the first mapping portion occupies grids corresponding to (N/G?2kmax) Doppler indexes of the subframe; G being the number of subframes in the delay-Doppler frame. Information mapped to second mapping portions at heads of different subframes is the same, and information mapped to second mapping portions at tails of different subframes is the same.

Abstract: A signal sending method includes mapping, by a transmit end, modulation symbols in delay-time domain to obtain a first delay-time domain symbol matrix; and performing, by the transmit end, first preset processing on the first delay-time domain symbol matrix to obtain a time domain sampling point, and sending the time domain sampling point after pulse shaping.