It might be double sideband suppressed carrier. If the carrier and the modulating signal are both pure sinewaves at a single frequency the the answer is yes. Each of the two sidebands will be a periodic signal. If f1 is the carrier and f2 is the modulating frequency and f1 >> f2 then the upper sideband will be periodic with a frequency of f1 + f2 and the lower sideband will be a periodic signal at a frequency of f1 - f2