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In cognitive radio networks (CRNs), spectrum sensing is critical for guaranteeing that the opportunistic spectrum access by secondary users (SUs) will not interrupt legitimate primary users (PUs). The application of full-duplex radio to spectrum sensing enables SU to carry out sensing and transmission simultaneously, improving both spectrum awareness and(More)
In this paper, we propose a novel approach to measuring ground surface displacement at high accuracy by radio interferometric ranging (RIR) with extremely low-cost devices. A major challenge to RIR in accurate measurement is multipath in mountainous environments. We propose a novel RIR scheme called Downslope Interferometric Phase (DIP) to decouple the(More)
Two-Step Weighted Least Squares (TSWLS) method (or the Chan method) is a classical TDOA-Based localization algorithm. We find that the Chan method will yield exceptionally large localization error if the target node is near the center of a circle formed by the anchor nodes. We name such a phenomenon Lost at the Center of a Circle (LCC). It is shown that LCC(More)
1  Abstract—In cognitive radio networks (CRN), secondary users (SUs) can share spectrum with licensed primary users (PUs). Because an SU receiver (SU-Rx) does not always share the same view of spectrum availability as the corresponding SU transmitter (SU-Tx), spectrum sensing conducted only by an SU transmitter tends to be overly sensitive to guarantee(More)
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