Communication method and communications apparatus

A receiving method, comprising:

• receiving signals comprising data carried in different subbands;
• performing subband filtering on the received signals to obtain a signal of a first subband in which data of a terminal device resides;
• removing a cyclic prefix from the signal of the first subband;
• performing fast Fourier transformation (FFT) on the signal from which the cyclic prefix has been removed to obtain a frequency domain signal;
• extracting, at a frequency location at which subcarrier mapping is performed in the first subband for the data of the terminal device, frequency domain data of the terminal device from the frequency domain signal, wherein the frequency location is a location of a frequency that is an integral multiple of a subcarrier spacing of the first subband, the subcarrier spacing of the first subband is an integral multiple of a basic frequency spacing, and frequency locations of subcarriers that are used to perform subcarrier mapping in different subbands do not overlap with each other;
• and
• performing signal detection on the extracted frequency domain data, to restore the data of the terminal device.

A sending apparatus, comprising:

• a memory, configured to store instructions;
• and
• a processor, configured to execute the instructions stored in the memory and, when executed by the processor, cause the sending apparatus to:
• obtain to-be-sent frequency domain data,
• determine a first subband for transmitting the data, wherein a subcarrier spacing of the first subband is an integral multiple of a basic frequency spacing,
• perform subcarrier mapping in the first subband for the data, wherein a subcarrier that is used to perform the subcarrier mapping is a subcarrier that is in the determined first subband and located at a frequency that is an integral multiple of the subcarrier spacing of the first subband, and frequency locations of subcarriers that are used to perform subcarrier mapping in different subbands do not overlap with each other,
• perform inverse fast Fourier transformation (IFFT) on the subcarrier obtained after the subcarrier mapping, to obtain a time domain signal,
• perform an operation of adding a cyclic prefix on the time domain signal,
• filter the signal to which the cyclic prefix has been added, and
• send the filtered signal.

A receiving apparatus, comprising:

• a memory, configured to store instructions;
• and
• a processor, configured to execute the instructions stored in the memory and, when executed by the processor, cause the receiving apparatus to:
• receive signals comprising data carried in different subbands,
• perform subband filtering on the received signals, to obtain a signal of a first subband in which data of a terminal device resides,
• remove a cyclic prefix from the signal of the first subband,
• perform fast Fourier transformation (FFT) on the signal from which the cyclic prefix has been removed, to obtain a frequency domain signal,
• extract, at a frequency location at which subcarrier mapping is performed in the first subband for the data of the terminal device, frequency domain data of the terminal device from the frequency domain signal, wherein the frequency location is a location of a frequency that is an integral multiple of a subcarrier spacing of the first subband, the subcarrier spacing of the first subband is an integral multiple of a basic frequency spacing, and frequency locations of subcarriers that are used to perform subcarrier mapping in different subbands do not overlap with each other, and
• perform signal detection on the extracted frequency domain data, to restore the data of the terminal device.