Pulse or digital communications – Transmitters – Antinoise or distortion
Reexamination Certificate
2007-09-19
2011-11-15
Tran, Khanh C (Department: 2611)
Pulse or digital communications
Transmitters
Antinoise or distortion
C455S114300
Reexamination Certificate
active
08059748
ABSTRACT:
Transmitters supporting multiple modulation modes and/or multiple frequency bands are described. A transmitter may perform large signal polar modulation, small signal polar modulation, and/or quadrature modulation, which may support different modulation schemes and systems. Circuit blocks may be shared by the different modulation modes to reduce cost and power. For example, a single modulator and a single power amplifier may be used for small signal polar modulation and quadrature modulation. The transmitter may apply pre-distortion to improve performance, to allow a power amplifier to support multiple frequency bands, to allow the power amplifier to operate at higher output power levels, etc. Envelope and phase distortions due to non-linearity of the power amplifier may be characterized for different input levels and different bands and stored at the transmitter. Thereafter, envelope and phase signals may be pre-distorted based on the stored characterizations to compensate for non-linearity of the power amplifier.
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Ballantyne Gary John
Choi Zae Yong
Panton William Ronald
Sahota Gurkanwal Singh
See Puay Hoe
Mobarhan Ramin
QUALCOMM Incorporated
Tran Khanh C
LandOfFree
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