NDLI: Joint Sidelobe and Peak Power Reduction in OFDM-Based Cognitive Radio

Content Provider	IEEE Xplore Digital Library
Author	Ghassemi, A. Lampe, L. Attar, A. Gulliver, T.A.
Copyright Year	2010
Abstract	Non-contiguous orthogonal frequency division multiplexing (NC-OFDM) is an effective transmission method for cognitive radio systems. It can provide high bandwidth utilization and robustness against time dispersive channels. However, NC-OFDM inherits the problems of high sidelobes and peak-to-average power ratio (PAPR) of the OFDM signal. If not accounted for, this introduces leakage into a primary user (PU) band and distorts the signal of the secondary user (SU). This paper proposes a joint sidelobe and PAPR reduction method that can simultaneously reduce the inherent OFDM out-of-band (OOB) radiation and the OOB radiation caused by a nonlinear power amplifier. In this method, selected mapping (SLM) sequences, which are generated from sequences with a low average sidelobe power, are used to improve the PAPR performance. The key idea is to generate multiple representations of the transmit signal and select a sequence with low OOB radiation and PAPR. We examine the performance of the proposed method taking into account the effects of non-ideal (i.e. non-linear) power amplification. The simulation results show that the proposed technique can significantly reduce OOB radiation while improving the PAPR and bit error rate (BER) for NC-OFDM signals.
Starting Page	1
Ending Page	5
File Size	361445
Page Count	5
File Format	PDF
ISBN	9781424435739
ISSN	10903038
DOI	10.1109/VETECF.2010.5594133
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-09-06
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Peak to average power ratio Joints Bit error rate Cognitive radio Quadrature amplitude modulation Phase shift keying
Content Type	Text
Resource Type	Article

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