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Low frequency feedforward and predistortion linearization of RF power amplifiers

Myoung, Suk Keun
http://rave.ohiolink.edu/etdc/view?acc_num=osu1150416616

Abstract Details

2006, Doctor of Philosophy, Ohio State University, Electrical Engineering.
Linearity is an area of great concerns in the development of communication systems. As the bandwidth of modulated signals becomes wider, RF power amplifiers (PA) have become a serious bottleneck due to their nonlinear response. This thesis gives a review of existing linearization systems commonly used in cellular phone basestations and which could be potentially applied to mobiles. Special focus is placed on predistortion linearization which is becoming prevalent. An alternative implementation of postdistortion often referred as low frequency feedforward linearization is also investigated. The existing issues associated with both low frequency feedforward and predistortion linearization are analyzed in details. Memory effects in PAs are identified as the origin of the degradation of the performance of linearization systems as the bandwidth is increased. Our research is concerned among other things with the development of improved RF predistortion algorithm accounting for such memory effects. In this thesis, we present theoretical work where the Volterra representation is used to analyze the performance of both predistortion and low frequency feedforward linearization systems in the presence of memory effects. A new real time algorithm is then developed for predistortion linearization which accounts for memory effects. This real time digital algorithm is then implemented in a FPGA testbed and verified using multisines and WCDMA modulated RF signals. This thesis concludes with a discussion of possible extensions of this work combining the various novel linearization schemes proposed.
Patrick Roblin (Advisor)
115 p.

Recommended Citations

Citations

  • Myoung, S. K. (2006). Low frequency feedforward and predistortion linearization of RF power amplifiers [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1150416616

    APA Style (7th edition)

  • Myoung, Suk Keun. Low frequency feedforward and predistortion linearization of RF power amplifiers. 2006. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1150416616.

    MLA Style (8th edition)

  • Myoung, Suk Keun. "Low frequency feedforward and predistortion linearization of RF power amplifiers." Doctoral dissertation, Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=osu1150416616

    Chicago Manual of Style (17th edition)

osu1150416616
978
© 2006, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.
Release 3.2.12