Telecommunications – Transmitter – Noise or interference elimination
Reexamination Certificate
2005-10-25
2005-10-25
Vo, Nguyen T. (Department: 2685)
Telecommunications
Transmitter
Noise or interference elimination
C455S127100, C375S297000
Reexamination Certificate
active
06959174
ABSTRACT:
To provide an amplifying device which is reduced in size, weight and cost and which can improve the distortion compensation performance. In the amplifying device, input signals are each subjected to digital orthogonal modulation using an IF and further to offset rotation processing in digital orthogonal modulators, then bifurcated into a main signal system and a control system, and detection of a power value is performed at an IF band in a power detecting section of the control system. Therefore, offset rotation processing of the input signals in the power detection is not required, so that a structure for matching phases of a multi-carrier signal and a power value signal is not required, resulting in improving the distortion compensation performance without using an analog delay line.
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Hongo Naoki
Miyatani Tetsuhiko
Okubo Yoichi
Suto Masaki
Hitachi Kokusai Electric Inc.
Jacobson & Holman PLLC
Le Nhan T.
Vo Nguyen T.
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