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URN	etd-0903107-162940
Author	Chi-Tsan Chen
Author's Email Address	No Public.
Statistics	This thesis had been viewed 5580 times. Download 2769 times.
Department	Electrical Engineering
Year	2006
Semester	2
Degree	Master
Type of Document
Language	zh-TW.Big5 Chinese
Title	A Hybrid Quadrature Polar Modulator for Enhancing Average-Efficiency of 3G Mobile Transmitter with Power Control
Date of Defense	2007-07-16
Page Count	78
Keyword	Class-E Power Amplifier Digital Predistortion Hybrid Quadrature Polar Modulator
Abstract	This thesis aims to use a hybrid quadrature polar modulator (HQPM) for enhancing average efficiency of 3G mobile transmitter with power control. The HQPM consists of a quadrature modulator instead of a phase modulator in the polar modulator for processing the RF modulated carrier and a Class-S modulator for processing the envelope signal. In addition, the instantaneous magnitude of the quadrature modulated signal is propotional to the instantaneous envelope magnitude. As a result, the output feed-through and gain-compression phenomenon in the polar modulator can be improved. The digital baseband processor realized by FPGA can generate CDMA2000 1x baseband signal with excellent modulation accuracy. For enhancing the average transmit efficiency, the output PA is realized as Class-E design. But the Vdd/AM and Vdd/PM nonlinear effects of the Class-E PA distort the output signal. To solve this problem, a digital predistorter is presented to compensate the nonlinear distortions. The proposed HQPM-based transmitter can simultaneously achieve high efficiency and high linearity over a wide modulated output power range.
Advisory Committee	Sheng-Fuh Chang - chair Tzong-Lin Wu - co-chair Kang-Chun Peng - co-chair H.-R. Chuang - co-chair Tzyy-Sheng Horng - advisor
Files	etd-0903107-162940.pdf indicate access worldwide
Date of Submission	2007-09-03

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