MULTI-MODE AND MULTI-BAND TRANSMITTERS FOR WIRELESS COMMUNICATION

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 sha...

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Bibliographic Details
Main Authors SAHOTA GURKANWAL SINGH, PANTON WILLIAM RONALD, BALLANTYNE GARY JOHN, SUN BO, SEE PUAY HOE ANDREW, CHOI, ZAE YONG
Format Patent
LanguageEnglish
Korean
Published 13.05.2010
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TRANSMISSION
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Summary: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 (160) and a single power amplifier (170) may be used for small signal polar modulation and quadrature modulation. The transmitter may apply pre-distortion (124,142) 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.
Bibliography:Application Number: KR20107006949