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156974 https://hdl.handle.net/2286/R.I.51749 http://rightsstatements.org/vocab/InC/1.0/ 2018 55 pages Masters Thesis Academic theses Text eng Gattani, Vineet Sunil Papandreou-Suppappola, Antonia Richmond, Christ Maurer, Alexander Arizona State University Masters Thesis Electrical Engineering 2018 As the demand for wireless systems increases exponentially, it has become necessary for different wireless modalities, like radar and communication systems, to share the available bandwidth. One approach to realize coexistence successfully is for each system to adopt a transmit waveform with a unique nonlinear time-varying phase function. At the receiver of the system of interest, the waveform received for process- ing may still suffer from low signal-to-interference-plus-noise ratio (SINR) due to the presence of the waveforms that are matched to the other coexisting systems. This thesis uses a time-frequency based approach to increase the SINR of a system by estimating the unique nonlinear instantaneous frequency (IF) of the waveform matched to the system. Specifically, the IF is estimated using the synchrosqueezing transform, a highly localized time-frequency representation that also enables reconstruction of individual waveform components. As the IF estimate is biased, modified versions of the transform are investigated to obtain estimators that are both unbiased and also matched to the unique nonlinear phase function of a given waveform. Simulations using transmit waveforms of coexisting wireless systems are provided to demonstrate the performance of the proposed approach using both biased and unbiased IF estimators. Electrical Engineering Coexistence Estimation multimodal Radar synchrosqueezing time-frequency Separation of Agile Waveform Time-Frequency Signatures from Coexisting Multimodal Systems