Patent ID: 6326860
Filing Date: 2001-12-04
Classification: H04L

Abstract:
A transmission front-end processor for modulating an amplitude of a carrier wave with baseband data, and setting power of a resultant, modulated carrier wave at a required value while controlling a leakage of power to adjoining channels to thereby output transmission data, comprising:a first filter connected to an input terminal to which the baseband data are applied, and removing frequency components which would otherwise cause the power of the baseband data to leak to the adjoining channels;a power modulator to which the carrier wave and the baseband data passed through said first filter are applied, and controlling an amplitude of the carrier wave with the baseband data, setting power of a result of control at the required value, and outputting the power; anda second filter removing higher order components from the carrier wave included in an output signal of said power modulator to thereby output the transmission data;said modulator modulating the amplitude of the carrier wave up to a non-linear amplifying, saturated range with a fundamental wave of the carrier wave made linear with respect to a voltage of the baseband data.