NDLI: Compensating imperfections in RF-DAC based transmitters using LUT-based predistortion

Content Provider	IEEE Xplore Digital Library
Author	Mohr, B. Ye Zhang Mueller, J.H. Heinen, S.
Copyright Year	2014
Description	Author affiliation: Integrated Analog Circuits & RF Syst, RWTH Aachen Univ., Aachen, Germany (Mohr, B.; Ye Zhang; Mueller, J.H.; Heinen, S.)
Abstract	This paper provides a model for the frontend of RF-DAC based transmitter architectures, which suffer from the imperfections of mixers, amplifiers and DACs. The model considers gain and phase errors as present in mixers, nonlinear compression due to limited output resistance as in amplifiers and element mismatch as in DACs. The model parameters are determined by measurement comparison with a prototype IC. Sveral compensation methods are compared, resulting in an IQ-LUT based predistortion as the most promising method. The LUT values are determined using LMS algorithm, resulting in a performance improvement from 10.7% EVM to 2.7% for IEEE802.11 transmission. As LMS is costly to implement in a digital design, another approximation method is evaluated, using only linear operations. This method results in an EVM of 2.4 %. Reducing the LUT coefficients from 256 to 16 and using linear interpolation for the missing coefficients is possible without degrading the overall system performance.
Sponsorship	IEEE Circuits Syst. Soc.
Starting Page	312
Ending Page	316
File Size	678977
Page Count	5
File Format	PDF
ISBN	9781479933785
ISSN	21641706
DOI	10.1109/SOCC.2014.6948946
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-09-02
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Table lookup Microprocessors Radio transmitters Predistortion Least squares approximations Mathematical model
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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