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Type of Document Master's Thesis Author zhang, chi Author's Email Address chizhang82@hotmail.com URN etd-12102006-195114 Title A Comparative Study of Quadrature Amplitude Modulation and Continuous Phase Modulation Degree Master of Science in Electrical Engineering Department Electrical Engineering Advisory Committee
Advisor Name Title Yih-Fang Huang Committee Co-Chair Thomas Fuja Committee Member Keywords
- simulation
- CPM
- QAM
- modulation
Date of Defense 2006-08-08 Availability unrestricted Abstract Two modulation techniques are studied in this thesis, quadratureamplitude modulation (QAM) and continuous phase modulation (CPM).
These modulation schemes in the presence of amplifier nonlinearity
and hostile transmission environments are analyzed as a complete
system using simulation to determine relative performance. A fair
comparison of these two modulation techniques is carried out,
demonstrating the tradeoffs between spectral efficiency and power
efficiency of these two techniques.
This thesis also presents an idea of nonuniform QAM
constellations, which can potentially improve bit-error-rate
performance in the presence of phase noise. An optimal nonuniform
QAM constellation is designed to be adaptive to the actual
probability distribution of the received symbols. Both analytical
results and simulation results show that nonuniform constellations
are superior to uniform constellations in the presence of phase
noise.
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