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Access Type
Campus Access
Document Type
thesis
Degree Program
Electrical & Computer Engineering
Degree Type
Master of Science (M.S.)
Year Degree Awarded
2013
Month Degree Awarded
May
Keywords
power amplifier, linearization, volterra series, signal processing
Abstract
The need for high spectral efficiency and data rate drives the modulation schemes like OFDM and QAM. The resulting signal is a complex signal with high peak to average power ratio. This property causes signal sensitivity to the non-linearity of power amplifiers. Power amplifiers create out-of-band distortion, in band distortion and spectral re-growth. The spectral re-growth affects the adjacent channels and cause Adjacent Channel Interference (ACI). So linearization techniques should be used to remove the skirts produced by the amplifier in the adjacent frequencies. The objective of this thesis is to figure out a pre distortion method that is simple enough to implement with an analog circuit. We are proposing a novel method to model the non linearity and use the same model as post-distorter and pre-distorter to invert non linearity so linear gain is maintained. The implementation is generic to all the non linear systems and can be implemented to invert the non linearity of any such system.
DOI
https://doi.org/10.7275/4028149
First Advisor
Dev Vrat Gupta