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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