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—This letter presents the outage performance analysis for a cognitive relay network (CRN) with imperfect channel knowledge estimations. Under the condition of imperfect channel state information (CSI) estimations of interference links between primary and secondary systems, especially the links from both secondary transmitter and secondary relays to primary(More)
—In this paper, we present performance analysis for underlay cognitive decode-and-forward relay networks with the N th best relay selection scheme over Nakagami-m fading channels. Both the maximum tolerated interference power constraint and the maximum transmit power limit are considered. Specifically , exact and asymptotic closed-form expressions are(More)
Analysis of strategies for serial-search spread-spectrum code acquisition-direct approach, " IEEE Trans. Abstract—The outage performance of cognitive relay networks (CRNs) for a decode-and-forward (DF) protocol in a spectrum sharing scenario with orthogonal space–time block code (OSTBC) transmission is presented in this paper. Both the exact formulas of the(More)
In underlay cognitive radio networks, imperfect channel knowledge will have an adverse effect on the performance of both the primary users (PU) and the secondary users (SU) owing to the interference power constraint of PU. This paper investigates the performance of a cognitive relay network (CRN) with imperfect channel state information (CSI) of the(More)
This paper investigates the outage performance of decode-and-forward (DF) based cognitive relay networks (CRNs) in the presence of multiple secondary destinations (SDs) in a spectrum sharing scenario with orthogonal space-time block code (OSTBC) transmission. By employing an opportunistic scheduling algorithm to select one out of L SDs, we derive both the(More)
In cognitive radio systems, interference between primary users and secondary users greatly affects the system performance, which is an issue worth studying. Recently, interference alignment (IA) has been proposed as an effective method to deal with the interference among multiple users. In this paper, we apply distributed interference alignment to a(More)
A novel control scheme on learning frame is proposed for control of uncertain robot manipulator performing periodic tasks. In the paper, the uncertainties in the robot system may follow non-Gaussian distribution or Gaussian distribution, but the premise condition is that they are bounded. The nonlinear relation formulation between controller gain and(More)