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Student Number 85324035
Author Fong-Gwa Kao(ӶQ)
Author's Email Address No Public.
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Department Electrical Engineering
Year 1997
Semester 2
Degree Master
Type of Document Master's Thesis
Language zh-TW.Big5 Chinese
Title Performance Simulation and Nonlinearity Analysis of Digital Modulation Schemes in Wireless Transmission System
Date of Defense
Page Count 57
Keyword
  • linear modulation
  • nonlinear
  • pi/4-DQPSK
  • power amplifier
  • TWTA
  • Abstract Although linear modulation schemes can achieve high spectrum
    efficiency,the nonlinearity of the transmitter power amplifier
    tends to spread the spectrum. Thus, it eliminates any spectrum
    efficiency advantage gained throughthe use of linear modulation
    schemes. This thesis discusses the systemperformance degradation
    resulting from using a nonlinear transmitter power amplifier.
    Three modulation schemes (pi/4-DQPSK, DQPSK, and GMSK)
    areconsidered and simulated. The closed expression (AM-to-AM and
    AM-to-PMconversions) of TWTA is used to model the transmitter
    power amplifier. Thespectral regrowth due to nonlinearity of
    power amplifier is discussed. Simulation results are represented
    for AWGN, Rayleigh flat fading, and Rayleigh frequency selective
    fading environments. After knowing how the effectsof
    nonlinearity affect systems, we can design the compensation
    circuits to reducethe impairment in the future.
    Table of Content
    Reference
    Advisor
  • Tsay Mu-King()
  • Files No Any Full Text File.
    Date of Submission

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