Title page for etd-0903107-162940


[Back to Results | New Search]

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

    [Back to Results | New Search]


    Browse | Search All Available ETDs

    If you have more questions or technical problems, please contact eThesys