Type of Document Master's Thesis Author Johnson, Daniel Eric Author's Email Address firstname.lastname@example.org, email@example.com URN etd-09082000-23270013 Title Adaptive Digital Predistortion with Applications for LMDS Systems Degree Master of Science Department Electrical and Computer Engineering Advisory Committee
Advisor Name Title Bostian, Charles W. Committee Chair Reed, Jeffrey Hugh Committee Member Sweeney, Dennis G. Committee Member Keywords
- Nonlinear Amplification
Date of Defense 2000-08-25 Availability unrestricted AbstractA limiting factor in the widespread deployment of LMDS systems is the limited distance of current systems. Rain attenuation and limited transmitter power are the primary causes of the limited distance. Adaptive digital predistortion is presented as a method of increasing effective transmitter power.
A background on LMDS link design, non-linear amplification, and predistortion is presented to assist the reader. A developed simulation uses AM-AM and AM-PM characteristics obtained from laboratory measurements of a 28 GHz amplifier to determine the effect of several predistortion implementation options and to confirm the feasibility of the proposed architecture.
The potential impact of this predistortion architecture on LMDS system design is considered. The presented multi-stage predistortion architecture is found to be capable of implementation at Msymbol/second rates utilizing a FPGA or custom IC and a moderate speed digital signal processor.
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