Transmitter apparatus and wireless communication apparatus

Details Transmitter apparatus and wireless communication apparatus Transmitter apparatus and wireless communication apparatus

2005-02-25

2009-02-24

Vo, Nguyen (Department: 2618)

Telecommunications

Transmitter

Noise or interference elimination

C455S115200, C375S296000

Reexamination Certificate

active

07496334

ABSTRACT:
A transmitter capable of carrying out a highly efficient polar coordinate modulation while maintaining an excellent distortion characteristic. When a high power amplifier is operated in a saturation mode to carry out a polar coordinate modulation, a switching control signal is set to be a multiplication, and a quadrature modulating digital signal and distortion data of a compensation table are multiplied, thereby adding a nonlinear distortion equivalent to that of the amplifier in a linear mode and compressing a peak factor of a modulating signal to enhance an efficiency of the polar coordinate modulation. When the amplifier is operated in the linear mode to carry out a linear amplification, the switching control signal is set to be a division and the quadrature modulating digital signal and the distortion data are divided, thereby adding a reverse distortion characteristic of the amplifier to carry out a nonlinear distortion compensation of the amplifier.

REFERENCES:
patent: 7126999 (2006-10-01), Dent
patent: 2005/0210354 (2005-09-01), Kurokami
patent: 2005/0226346 (2005-10-01), Ode et al.
patent: 3024515 (2000-01-01), None
patent: 3044057 (2000-03-01), None
patent: 2002-500846 (2002-01-01), None
patent: 2002-135062 (2002-05-01), None

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