Signal processing method and device

A signal processing method, used to process a received filtered-orthogonal frequency division multiplexing (f-OFDM) signal, wherein a transition band of the f-OFDM signal meets a first preset threshold, and the method comprises:

• processing the received f-OFDM signal based on applying a signal processing policy, to obtain an OFDM signal,
• wherein applying the signal processing policy comprises:
• performing digital frequency conversion processing, downsampling processing, and filtering processing of a first spectral mask on the received f-OFDM signal, to filter out a first sideband signal;
• performing filtering processing of a second spectral mask on the received f-OFDM signal, to filter out a first signal;
• performing digital frequency conversion processing, downsampling processing, and filtering processing of a third spectral mask on the received f-OFDM signal, to filter out a second sideband signal;
• and
• superposing the first sideband signal, the first signal, and the second sideband signal to obtain the OFDM signal corresponding to the received f-OFDM signal, wherein the first sideband signal is located in a left sideband of the OFDM signal obtained after the superposing, the second sideband signal is located in a right sideband of the OFDM signal obtained after the superposing, and the first signal is located in an intermediate frequency band in the OFDM signal obtained after the superposing other than the left sideband and the right sideband,
• wherein a bandwidth of the first spectral mask and a bandwidth of the third spectral mask are both less than a bandwidth of the second spectral mask, and
• wherein a transition band of the first spectral mask and a transition band of the third spectral mask are both less than a transition band of the second spectral mask.

A device, comprising:

• a processor configured to apply a filtering policy to filter an orthogonal frequency division multiplexing (OFDM) signal, to obtain a fourth filtered-OFDM (f-OFDM) signal;
• and
• a transmitter configured to transmit the fourth f-OFDM signal;
• wherein applying the filtering policy comprises:
• dividing a to-be-transmitted OFDM signal into a first sideband signal, a first signal, and a second sideband signal, wherein the first sideband signal is located in a left sideband of the to-be-transmitted OFDM signal, the second sideband signal is located in a right sideband of the to-be-transmitted OFDM signal, the first signal is located in an intermediate frequency band in the to-be-transmitted OFDM signal other than the left sideband and the right sideband, and a bandwidth of the first sideband signal and a bandwidth of the second sideband signal are both less than a bandwidth of the first signal;
• sampling, by using a first sampling rate, the first sideband signal obtained through division by the signal division unit, and perform filtering processing of a first spectral mask, upsampling processing, and digital frequency conversion processing on the sampled signal by using the first sampling rate, to generate a first f-OFDM signal;
• sampling, by using a second sampling rate, the first signal obtained through division by the signal division unit, and perform filtering processing of a second spectral mask on the sampled signal by using the second sampling rate, to generate a second f-OFDM signal;
• and
• sampling, by using a third sampling rate, the second sideband signal obtained through division by the signal division unit, and perform filtering processing of a third spectral mask, upsampling processing, and digital frequency conversion processing on the sampled signal by using the third sampling rate, to generate a third f-OFDM signal;
• and
• superimposing the first f-OFDM signal, the second f-OFDM signal, and the third f-OFDM signal that are obtained through filtering by the filter unit, to obtain the fourth f-OFDM signal,
• wherein the first sampling rate and the third sampling rate are both less than the second sampling rate;
• wherein a transition band of the first spectral mask and a transition band of the third spectral mask are both less than a transition band of the second spectral mask;
• and
• wherein the filtering processing of the first spectral mask, the filtering processing of the second spectral mask, and the filtering processing of the third spectral mask are used to ensure that an out-of-band leakage of the fourth f-OFDM signal meets a first preset threshold.

A device, comprising:

• a receiver configured to receive a filtered-orthogonal frequency division multiplexing (f-OFDM) signal, wherein a transition band of the f-OFDM signal meets a first preset threshold;
• and
• a processor configured to apply a single processing policy to the received f-OFDM signal to obtain an OFDM signal,
• wherein applying the signal processing policy comprises:
• performing digital frequency conversion processing, downsampling processing, and filtering processing of a first spectral mask on the received f-OFDM signal, to filter out a first sideband signal;
• performing filtering processing of a second spectral mask on the received f-OFDM signal, to filter out a first signal;
• performing digital frequency conversion processing, downsampling processing, and filtering processing of a third spectral mask on the received f-OFDM signal, to filter out a second sideband signal;
• and
• superposing the first sideband signal, the first signal, and the second sideband signal to obtain the OFDM signal corresponding to the received f-OFDM signal, wherein the first sideband signal is located in a left sideband of the OFDM signal obtained after the superposing, the second sideband signal is located in a right sideband of the OFDM signal obtained after the superposing, and the first signal is located in an intermediate frequency band in the OFDM signal obtained after the superposing other than the left sideband and the right sideband,
• wherein a bandwidth of the first spectral mask and a bandwidth of the third spectral mask are both less than a bandwidth of the second spectral mask, and
• wherein a transition band of the first spectral mask and a transition band of the third spectral mask are both less than a transition band of the second spectral mask.