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EigenSpace-Based Generalized Sidelobe Canceler Applied for Sidelobe Suppression in Cognitive Radio Systems

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Abstract

Cognitive radio (CR) is the cutting-edge technique to intercept the hindrance of spectrum paucity. This is done by allowing the spectrum to be utilized dynamically. Orthogonal frequency division multiplexing (OFDM), a best multi-carrier method, is a promising contender of CR. This is because of the intrinsic characteristics like, the ability of changing its wave from, analyzing the spectrum and its ability to withstand to multipath channel effect. However, one of the main problems that OFDM-based CR systems experiences is high out-of-band (OOB) radiation. Suppression of high OOB radiation is significantly important because the interference to the licensed users (LUs) from neighboring users should be limited to the lowest possible level. In this manuscript, an innovative approach, Eigenspace-based generalized sidelobe canceler (EGSC) has been proposed for reducing high OOB radiation. The EGSC uses signal and noise subspaces for distinguishing the desired signals (the main lobes) and un-desired signals (the sidelobes). These sidelobes are the main cause of high OOB radiation. The signal and noise subspaces are constructed from the autocorrelation matrix of generalized sidelobe canceler (GSC). Finally, on projecting the weight vector of a GSC onto the signal subspace we get a new modified vector that reduces the un-desired signal in a better way. We show through simulations that our proposed technique achieves much better OOB radiation reduction, in terms of normalized power-spectral-density (PSD) as compared to the techniques found in the literature.

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Availability of data and material

The authors declare that [the/all other] data supporting the findings of this study are available within the article [and its supplementary information files].

Code availability

All the simulations are done using MATLAB software and Custom Code will be available on request from the authors.

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Funding

This research is not funded by any agency / department.

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Authors and Affiliations

  1. Department of Electrical Engineering, Faculty of Engineering and Technology, International Islamic University Islamabad, Islamabad, Pakistan

    Atif Elahi

  2. Higher Education Department, Government of Khyber Pakhtunkhwa, Khyber Pakhtunkhwa, Pakistan

    Atif Elahi

  3. Department of Electronics, University of Buner, Buner, Pakistan

    Shafqat Ullah Khan

  4. Department of Electronics, University of Peshawar, Peshawar, Pakistan

    Noor Gul

  5. Advanced RF & Microwave Research Group, Department of Communication Engineering, Faculty of Electrical Engineering, Universiti Teknologi Malaysia, 81310, Skudai, Johor, Malaysia

    Shafqat Ullah Khan

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  1. Atif Elahi
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  2. Noor Gul
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Contributions

AE, NG and SUK contributed in the design of Eigen Space – Based Generalized Sidelobe Canceler Applied for Sidelobe Suppression in Cognitive Radio Systems, simulations of the results and preparation of manuscript.

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Correspondence to Atif Elahi.

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Elahi, A., Gul, N. & Khan, S.U. EigenSpace-Based Generalized Sidelobe Canceler Applied for Sidelobe Suppression in Cognitive Radio Systems. Wireless Pers Commun 121, 3009–3028 (2021). https://doi.org/10.1007/s11277-021-08861-x

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