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Although noncircular (NC) signals are frequently encountered in wireless communications, their statistical property has not yet been utilized in state-of-the-art methods for spectrum sensing. In this paper, a variant of Hadamard (HDM) ratio test is devised to exploit the NC property of the primary signals for spectrum sensing, which is named the NC-HDM algorithm. As the NC-HDM approach is able to...
Based on joint iterative optimization, a robust widely linear (WL) reduced-rank minimum variance distortion less response (MVDR) beam forming algorithm is proposed for noncircular signals. To handle the issue of the mismatch between the presumed array steering vector and actual array steering vector, a diagonal loading technique is devised. As the proposed beam former takes advantage of the noncircular...
This paper introduces an eigenspace-based widely linear (WL) beam former for noncircular signals. The conventional minimum variance distortion less response (MVDR) beam former becomes sub optimal when the signals are noncircular, and the optimal WL MVDR beam former has been proposed to gain the optimal outputs when the number of training samples is infinite. However, its performance may degrate for...
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