Abstract: Embodiments of the present invention disclose Orthogonal Frequency Division Multiplexing (OFDM) signal generation methods, related devices, and related application systems. An example method may include: obtaining parameter information of an OFDM signal; determining N first subcarriers and P second subcarriers from M subcarriers based on a preset parameter D; separately allocating signal power to the N first subcarriers and the P second subcarriers in two phases, to determine waveforms of the two phases, that is, a first waveform and a second waveform; and generating an OFDM signal including waveform symbols of the two phases.

Abstract: This application provides a wireless sensing method and an apparatus. The method includes: A first communication apparatus receives a first signal and a second signal based on a first transmission parameter set and a second transmission parameter set respectively, and performs sensing based on the first signal and the second signal, to obtain a sensing result. The first transmission parameter set corresponds to the first signal, at least one parameter in the first transmission parameter set meets a first condition, and the first condition is related to a targeted ranging coverage; and the second transmission parameter set corresponds to the second signal, at least one parameter in the second transmission parameter set meets a second condition, and the second condition is related to targeted sensing precision.

Abstract: A transmit end receives a first ranging parameter from a receive end, where the first ranging parameter is received in an Nth time of ranging, and the first ranging parameter includes first ranging precision of a ranging signal and/or a first signal-to-noise ratio of the ranging signal (S310). The transmit end determines a first ranging waveform based on the first ranging parameter (S320). The transmit end sends the first ranging waveform to the receive end (S330). The transmit end receives a second ranging parameter from the receive end, where the second ranging parameter is determined based on the first ranging waveform, the second ranging parameter includes second ranging precision of the ranging signal and/or a second signal-to-noise ratio of the ranging signal, and the second ranging precision is less than the first ranging precision (S340).

Abstract: A first communication apparatus determines a first frequency domain resource, where the first frequency domain resource is determined from a frequency domain resource pool based on a sensing requirement parameter. The first communication apparatus sends a sensing signal on the first frequency domain resource.

Abstract: This application provides communication apparatuses and methods for signal transmission and reception, applied to, for example, backscatter communications. In an example method, a tag device receives a downlink excitation signal, where the downlink excitation signal is a linear frequency modulated signal or a multi-carrier linear frequency modulated signal. The tag device generates an uplink reflection signal according to the downlink excitation signal and uplink information. The tag device sends the uplink reflection signal to a network device. When receiving the uplink reflection signal from the tag device and receiving the downlink excitation signal, the network device performs fractional Fourier transform on the uplink reflection signal and the downlink excitation signal, to obtain an uplink frequency domain reflection signal and a downlink frequency domain excitation signal. The uplink frequency domain reflection signal and the downlink frequency domain excitation signal do not overlap each other.