First Advisor

Fu Li

Term of Graduation

Summer 2023

Date of Publication


Document Type


Degree Name

Doctor of Philosophy (Ph.D.) in Electrical and Computer Engineering


Electrical and Computer Engineering




5G mobile communication systems, Modulation (Electronics), Radio frequency amplifiers, Electric distortion, Power amplifiers, Orthogonal frequency division multiplexing



Physical Description

1 online resource (xi, 178 pages)


The collection of papers addresses various aspects of spectra and signals in RF wireless systems for 5G and beyond. The first paper focuses on the nonlinear effects of amplified dual-band OFDM signals, providing a spectrum model for intermodulation and cross-modulation. The second paper extends this analysis beyond bandwidth restrictions, enabling accurate prediction of amplified dual-band spectrum. The third paper emphasizes the significance of out-of-band intermodulation products and derives an analytical expression using third-order intercept points. The fourth paper presents a unified spectrum expression for OFDM, FBMC, and F-OFDM, facilitating comparative insights into these signals. The fifth paper explores second-order intermodulation in wideband RF communications and proposes a power spectrum model to quantify its impact. Finally, the sixth paper extends the analysis to fourth-order intermodulation and establishes a comprehensive power spectrum model encompassing even- and odd-order intermodulation distortions. The findings contribute to the understanding of the modeling of spectra and signals, providing valuable insights for RF engineers, spectrum planners, and researchers in the field.


© 2023 Xianzhen Yang

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Persistent Identifier

Available for download on Sunday, August 04, 2024