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Existing studies on cognitive two-way relay networks assume that the primary users (PUs) transmit data with two power levels. In practice, it is possible that the PUs may adopt multiple power levels to maximize their throughputs or to compensate for wireless link fading. In such a scenario, there exist two key problems: one is the detection accuracy for the secondary users (SUs), and the other is...
A novel Kuiper's test-based spectrum sensing approach in cognitive radio is proposed in this paper. The Kuiper-based detector is a computationally efficient spectrum sensing algorithm, which exploits the maximum positive and negative deviations between the empirical cumulative distribution function (cdf) of received samples and that of noise signals as the test statistic, and is insensitive to the...
This paper investigates the system performance of two-way relay channel with an eavesdropper in cognitive network, where two users exchange their information via an assisting relay based on the detection results of the primary users. Specifically, when the two-way relay system detects that the primary users do not occupy the spectrum, they will perform the two-way transmission. Otherwise, they will...
Cognitive radio (CR) is a newly emerging technology proposed to improve the spectrum utilization. The interference-tolerant scenario is considered that the interfering secondary (unlicensed) terminals are spatially Poisson distributed and secondary terminals are not allowed to transmit within the interference region of primary (licensed) network. In this paper, two methods are proposed by extending...
In this paper, the closed expressions for statistics, such as outage probability (OP), level crossing rate (LCR) and average fade duration (AFD) of multiple interferers in Nakagami-m fading channels in cognitive networks are presented. Besides, the interference-tolerant scenario is considered that the spatially Poisson distributed interfering secondary (unlicensed) terminals share the same frequency...
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