NDLI: Experimental performance evaluation of IQ imbalance and DC offset estimation and compensation technique for 3GPP LTE base station

Content Provider	IEEE Xplore Digital Library
Author	Yamaoka, A. Yamaguchi, K. Kato, T. Tanabe, Y.
Copyright Year	2010
Description	Author affiliation: Corporate Research & Development Center, TOSHIBA Corporation, Kawasaki, Kanagawa, 212-8582, JAPAN (Yamaoka, A.; Yamaguchi, K.; Kato, T.; Tanabe, Y.)
Abstract	In the case of recent wireless communication systems, the need to achieve high performance means that impairments in analog circuits cannot be disregarded. In view of the need for highly accurate compensation, many error compensation techniques using digital signal processing have been studied recently. Digital predistorter (DPD), which can eliminate odd-order distortion caused by PA nonlinearity, is one of the compensation techniques. However, in the case that direct conversion architecture is used in both a forward path and a loop-back path, errors in a quadrature modulator (QMOD) and a quadrature demodulator (QDEMOD) affect the performance of DPD. Previously, we proposed an error estimation technique for a QMOD and a QDEMOD that uses a variable phase shifter and evaluated its performance by an experiment using a narrow-band signal. In this paper, we evaluate the performance of the error estimation technique using the signal based on the 3GPP Long Term Evolution (LTE), whose bandwidth is wider than that in the previous experiment. The results show that image rejection ratio (IRR) after compensation is −59dBc and error vector magnitude (EVM) is −52dBc at the output of the QMOD.
Starting Page	268
Ending Page	271
File Size	1276814
Page Count	4
File Format	PDF
ISBN	9781424460564
ISSN	0149645X
e-ISBN	9781424460588
e-ISBN	9781424460571
DOI	10.1109/MWSYM.2010.5515096
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-05-23
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Base stations Error analysis Wireless communication Analog circuits Error compensation Digital signal processing Demodulation Phase shifters Narrowband Long Term Evolution Phase Shifter Quadrature modulators Quadrature demodulators IQ imbalance DC offset
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering Radiation

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