NDLI: OFDMA nonlinear distortion recovery using improved clipping localization and iterative projections

Content Provider	IEEE Xplore Digital Library
Author	Guoguang Chen Ansari, R.
Copyright Year	2013
Description	Author affiliation: Dept. of Electr. & Comput. Eng., Univ. of Illinois at Chicago, Chicago, IL, USA (Guoguang Chen; Ansari, R.)
Abstract	In OFDM-based systems the effect of nonlinear amplification at the transmitter is increasingly being tackled by receiver-oriented methods that aim to reduce distortion through estimating and recovering the clipped signal. However, in OFDMA systems, recovery of clipped signals poses new challenges because not all modulation information about other users is available to any individual user. Recently a scheme based on simple clip localization and band limited signal recovery has been proposed to address this problem but its performance is limited. In this paper, we propose to improve clip location estimation by exploiting key factors such as closeness of signal level to clipping threshold, clip time-span, and out-of-band power for local windowed subsequences, and then incorporate clip location estimates in iterative projection method to recover the clipped signal. Extensive simulations demonstrate that the performance is significantly improved with the proposed scheme compared with existing methods.
Sponsorship	IEEE Commun. Soc.
Starting Page	1
Ending Page	5
File Size	120465
Page Count	5
File Format	PDF
ISBN	9781467350112
ISSN	19345070
e-ISBN	9781467350136
DOI	10.1109/WTS.2013.6566249
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-04-17
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Estimation Peak to average power ratio Iterative methods Time-domain analysis Signal to noise ratio
Content Type	Text
Resource Type	Article

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