Information transmission method and communication apparatus

An information transmission method, comprising:

• receiving a transmitted signal;
• determining a plurality of first subcarrier data items on a plurality of first subcarriers of a first frequency subband based on the transmitted signal;
• performing a first phase reverse rotation on the plurality of first subcarrier data items based on a mixing frequency and a first reference frequency corresponding to the first frequency subband;
• and
• performing post-processing on the plurality of first subcarrier data items obtained through first phase reverse rotation.

A communication apparatus, comprising:

• a processor, configured to:
• determine a plurality of first subcarrier data items on a plurality of first subcarriers of a first frequency subband;
• perform a first phase rotation on each of the plurality of first subcarrier data items based on a mixing frequency and a first reference frequency corresponding to the first frequency subband;
• and
• determine a signal to be transmitted based on a plurality of first subcarrier data items obtained through the first phase rotation;
• and
• a transceiver, configured to send the signal.