Modulation method and apparatus applicable to ovxdm system, and ovxdm system

A modulation apparatus applicable to an OvXDM system, and comprising:

• a waveform generation module, configured for generating an initial envelope waveform in a modulation domain based on design parameters;
• a virtual cutoff module, configured for subtracting a tail length of the initial envelope waveform from a width of the initial envelope waveform in the modulation domain, to obtain a virtual cutoff width of the initial envelope waveform;
• a modulation-domain shift interval calculating module, configured for dividing the virtual cutoff width of the initial envelope waveform by a first quantity of times of overlapped multiplexing, to obtain a modulation-domain shift interval;
• a first shift module, configured for shifting the initial envelope waveform by the modulation-domain shift interval in the modulation domain based on the first quantity of times of overlapped multiplexing, to obtain offset envelope waveforms in the modulation domain;
• a multiplication module, configured for multiplying symbols in a to-be-modulated sequence by the offset envelope waveforms that are respectively corresponding to the symbols, to obtain modulated envelope waveforms in the modulation domain;
• and
• a first superimposition module, configured for superimposing the modulated envelope waveforms in the modulation domain, to obtain a complex modulated envelope waveform in the modulation domain.

An OvXDM system, comprising the modulation apparatus applicable to the OvXDM system, wherein the modulation apparatus comprises:

• a waveform generation module, configured for generating an initial envelope waveform in a modulation domain based on design parameters;
• a virtual cutoff module, configured for subtracting a tail length of the initial envelope waveform from a width of the initial envelope waveform in the modulation domain, to obtain a virtual cutoff width of the initial envelope waveform;
• a modulation-domain shift interval calculating module, configured for dividing the virtual cutoff width of the initial envelope waveform by a first quantity of times of overlapped multiplexing, to obtain a modulation-domain shift interval;
• a first shift module, configured for shifting the initial envelope waveform by the modulation-domain shift interval in the modulation domain based on the first quantity of times of overlapped multiplexing, to obtain offset envelope waveforms in the modulation domain;
• a multiplication module, configured for multiplying symbols in a to-be-modulated sequence by the offset envelope waveforms that are respectively corresponding to the symbols, to obtain modulated envelope waveforms in the modulation domain;
• and
• a first superimposition module, configured for superimposing the modulated envelope waveforms in the modulation domain, to obtain a complex modulated envelope waveform in the modulation domain.