Title page for etd-0708102-214807


[Back to Results | New Search]

URN etd-0708102-214807
Author Chun-Ying Huang
Author's Email Address No Public.
Statistics This thesis had been viewed 5560 times. Download 1989 times.
Department Electrical Engineering
Year 2001
Semester 2
Degree Master
Type of Document
Language English
Title Compensation For Gain/Phase Imbalance And DC Offset At Quadrature Modulator And Demodulator With Adaptive Inverse QRD-RLS Algorithm
Date of Defense 2002-06-21
Page Count 54
Keyword
  • Inverse QRD-RLS Algorithm
  • Predistorter
  • Quadrature Modulation
  • Gain/Phase Imbalance
  • Adaptive Filter
  • DC Offset
  • Compensation
  • Abstract There has been much effort in new design for transceiver used in mobile communications. The general approach is to combine RF functions with DSP to allow linear modulation techniques and permit flexibility of modulation format and receiver processing. In practice, with the quadrature modulation technique there is always some imbalance between the I- and Q channels of modulator and demodulator. This is mainly due to finite tolerances of capacitor and resistor values used to implement the analog components. The unavoidable imbalance between the I- and Q channels is known to degrade the performance of quadrature communication system.
    The main concern of this thesis is to propose a new blind scheme and with fast convergence algorithm, such as the inverse QRD-RLS algorithm, to deal with the problem described above for compensation in the transmitter and receiver. First, for the transmitter, the so-called adaptive estimation and compensation with power measurement implemented by the inverse QRD-RLS algorithm is employed. While in the receiver, a new blind adaptive filtering approach of the nonlinear parameters estimation and compensation, along with the power measurement in the receiver, is devised to adaptively compensate for the gain/phase imbalance and DC offsets in a quadrature demodulator. Where the conventional inverse QRD-RLS algorithm is employed for estimating the parameters of compensator, without using any reference signal transmitted from the transmitter. To document the merits of the proposed scheme, computer simulation for the coherent 16-PSK-communication system is carried out. With our proposed method a great improvement for eliminating the effects of the imbalance and offset over the existing techniques has verified. It has rapidly convergence rate and the smaller mean square error in steady state.
    Advisory Committee
  • Jin-Gou Ma - chair
  • Hsin-Hsyong Yang - co-chair
  • Miin-Jong Hao - co-chair
  • Rung-Hung Gau - co-chair
  • Shiunn-Jang Chern - advisor
  • Files
  • etd-0708102-214807.pdf
  • indicate accessible in a year
    Date of Submission 2002-07-08

    [Back to Results | New Search]


    Browse | Search All Available ETDs

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