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Appl. Sci. 2015, 5(4), 894-909; doi:10.3390/app5040894

Sidelobe Reduction in Non-Contiguous OFDM-Based Cognitive Radio Systems Using a Generalized Sidelobe Canceller

1
Department of Electronic Engineering, International Islamic University, Sector H-10, Islamabad 44000, Pakistan
2
Department of Electrical Engineering, Air University, Sector E-9, Islamabad 44000, Pakistan
3
Institute of Signal, Systems and Soft Computing (ISSS), Islamabad 44000, Pakistan
4
Department of Electrical Engineering, COMSATS Institute of Information Technology, Attock Campus, Attock 43600, Pakistan
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Christos Verikoukis
Received: 19 August 2015 / Revised: 8 October 2015 / Accepted: 9 October 2015 / Published: 21 October 2015
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Abstract

In orthogonal frequency division multiplexing (OFDM), sidelobes of the modulated subcarriers cause high out-of-band (OOB) radiation, resulting in interference to licensed and un-licensed users in a cognitive radio system environment. In this work, we present a novel technique based on a generalized sidelobe canceller (GSC) for the reduction of sidelobes. The upper branch of the GSC consists of a weight vector designed by multiple constraints to preserve the desired portion of the input signal. The lower branch has a blocking matrix that blocks the desired portion and preserves the undesired portion (the sidelobes) of the input signal, followed by an adaptive weight vector. The adaptive weight vector adjusts the amplitudes of the undesired portion (the sidelobes) so that when the signal from the lower branch is subtracted from the signal from the upper branch, it results in cancellation of the sidelobes of the input signal. The effectiveness and strength of the proposed technique are verified through extensive simulations. The proposed technique produces competitive results in terms of sidelobe reduction as compared to existing techniques. View Full-Text
Keywords: cognitive radio; orthogonal frequency division multiplexing; generalized sidelobe canceller cognitive radio; orthogonal frequency division multiplexing; generalized sidelobe canceller
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Elahi, A.; Qureshi, I.M.; Khan, Z.U.; Zaman, F. Sidelobe Reduction in Non-Contiguous OFDM-Based Cognitive Radio Systems Using a Generalized Sidelobe Canceller. Appl. Sci. 2015, 5, 894-909.

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