NDLI: Peak-to-average power ratio reduction in OFDM with blind selected pilot tone modulation

Content Provider	IEEE Xplore Digital Library
Author	Chen, N. Zhou, G.T.
Copyright Year	2005
Description	Author affiliation: Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA, USA (Chen, N.; Zhou, G.T.)
Abstract	Orthogonal frequency division multiplexing (OFDM) is a spectrally efficient multicarrier modulation technique for high speed data transmission over multipath fading channels. However, the price paid for the high spectral efficiency is low power efficiency. OFDM signals suffer from high peak-to-average power ratios (PARs) which lead to power inefficiency in the RF portion of the transmitter. Selected mapping (SLM) is a promising distortionless technique to reduce the PAR of an OFDM signal. In this paper, we propose a novel technique which links the index of the phase rotation sequence in SLM to the location of the pilot tones that are used to estimate the channel. Each pilot tone location-phase sequence selection can lead to a different PAR value for the time-domain OFDM signal, and the signal with the lowest PAR value is transmitted. Our proposed method is "blind" in the sense that the "optimum" pilot tone location-phase sequence index is not transmitted as side information. We describe a novel technique to blindly detect the optimum index at the receiver by taking advantage of the disparity between the pilot tone and information signal powers. PAR reduction performance as well as BER performance of the proposed method in frequency selective fading channels are illustrated.
Sponsorship	IEEE Signal Processing Soc
File Size	300853
File Format	PDF
ISBN	0780388747
ISSN	15206149
DOI	10.1109/ICASSP.2005.1415842
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-03-23
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Peak to average power ratio OFDM modulation Fading Data communication RF signals Radio frequency Transmitters Signal mapping Distortion Phase estimation
Content Type	Text
Resource Type	Article

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