Telecommunications – Transmitter – Noise or interference elimination
Reexamination Certificate
2006-12-26
2011-11-01
Jackson, Blane J (Department: 2618)
Telecommunications
Transmitter
Noise or interference elimination
C455S126000
Reexamination Certificate
active
08050637
ABSTRACT:
An object of the invention is to provide a polar modulation transmitter that can perform adaptive distortion compensation processing without the need for a synchronization adjustment circuit for synchronizing an input baseband signal and an output signal of a power amplifier. An adaptive operation control section1501measures the unbalance amount of an output spectrum of a power amplifier1and a coefficient adjustment determination section of the adaptive operation control section1501performs iteration control so that if the unbalance amount is equal to or greater than a predetermined threshold value, coefficient information output to a distortion compensation processing circuit1301is adjusted and an adjustment is made to distortion compensation processing in the distortion compensation processing circuit1301and if the unbalance amount is less than the predetermined threshold value, the coefficient information is maintained, whereby the characteristic change of the power amplifier1at the environmental temperature change time can be adaptively compensated for without using a synchronization adjustment circuit for synchronizing an input baseband signal and an output signal from the power amplifier1.
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Shimizu Yoshito
Urushihara Tomoya
Jackson Blane J
Panasonic Corporation
Pearne & Gordon LLP
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