To restrain deterioration in the performance of a transmission circuit by PAPR and distortion in the transmission circuit.
Two fixed envelope curve signals are generated from an input signal. First and second distributors distribute the two fixed envelope curve signals. One output of the first and second distributors is amplified by first and second amplifiers, respectively. The output of the first and second amplifiers is composited by a lossless compositing device. The other output of the first and second distributors is composited by isolation. The output of the isolation compositing device is added to the output of the lossless compositing device. Distortion is detected as generated in the lossless compositing device. The detected distortion is amplified by auxiliary amplification. Distortion amplified by the auxiliary amplifier is re-fed to the output of the lossless compositing device while the amplitude is in an opposite phase. The distortion component of the output of the lossless compositing device is canceled and removed.
COPYRIGHT: (C)2007,JPO&INPIT
IZUMI TAKASHI
ENOKI TAKASHI