Modulator for generating a burst-like modulated wave

摘要

A modulator for generating a burst-like modulated wave used in a multi-carrier transmission type communication system in which a plurality of modulated waves including at least one burst-like modulated wave exist on the same transmission line and the frequency band occupied by energy of each of the plurality of modulated waves is limited. Polarities of the transmission code which appear before and after either of on-timing and off-timing of the carrier on/off switched to obtain the burst-like modulated wave among the plurality of modulated waves are inverted to each other, whereby the envelope of the burst-like modulated wve can be changed gradually at the carrier on/off timing in order to reduce the interference of the modulated wave with the adjacent channels without degrading the transmission efficiency.