Ghannouchi, F. M.Rafay, Abdul2018-05-242018-05-242018-05-17Rafay, A. (2018). Precise Delay Estimation and Compensation for Real-time Adaptive Digital Predistortion (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/31935http://hdl.handle.net/1880/106664Real-time implementation of digital predistortion (DPD), a technique for linearizing power amplifiers, has gained importance recently due to stringent transceiver performance specifications for future wireless networks. Precise delay estimation and alignment is imperative for any DPD algorithm to work. Several algorithms are present in the literature on the topic. However, the difficulties arise from energy efficiency and the low-cost implementation of these algorithms. The goal of this work is to implement real-time delay alignment of high bandwidth signals for transmitter impairment compensation in systems using low sampling rate analog-to-digital converters (ADCs). The proposed system uses a resource efficient and scalable design which is based on correlation and fractional delay filters, which can be implemented in the hardware and seamlessly integrated with any DPD system. Both simulation and hardware results, on field programmable gate arrays (FPGAs), have shown improvement in DPD performance when the delay estimation system is employed.engUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.fractional delay estimationalignmentdigital predistortionpower amplifiersFPGAEngineeringEngineering--Electronics and Electricalmaster thesis10.11575/PRISM/31935