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Optimal Precoding in Conjunction with Windowing for Reduction in OOB Power of OFDM Based CR Systems

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Abstract

In this paper we propose the design of an orthogonal precoder, in conjunction with optimal windowing, for reduction in out of band power in primary users’ (PUs) frequency bands in OFDM based cognitive radio systems. First we derive the power spectral density expression to calculate the interference power in the PUs frequency bands. We then construct an interference minimization problem which is called a generalized Hermitian eigenvalue problem with an orthogonality constraint. The resulting precoding, in conjunction with optimal windowing, reduces the interference power when compared to only precoding and only windowing, at the cost of spectral efficiency.

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Authors and Affiliations

  1. Department of Electronics Engineering, Aligarh Muslim University, Aligarh, India

    Mohd Sharique

  2. Department of Electrical Engineering, IIT Kanpur, Kanpur, India

    Ajit K. Chaturvedi

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  1. Mohd Sharique
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  2. Ajit K. Chaturvedi
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Correspondence to Mohd Sharique.

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Sharique, M., Chaturvedi, A.K. Optimal Precoding in Conjunction with Windowing for Reduction in OOB Power of OFDM Based CR Systems. Wireless Pers Commun 91, 679–689 (2016). https://doi.org/10.1007/s11277-016-3487-2

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  • DOI: https://doi.org/10.1007/s11277-016-3487-2

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