In this paper, we investigate two partial relay selection (PRS) protocols in underlay cognitive
radio under impact of hardware impairment. In particular, the re-active and pro-active PRS …

Relay assisted cognitive radio is a promising technology that allows wireless systems to
sense the environment, learn from previous experience and improves spectrum utilization by …

Cognitive Radio (CR) aims to improve spectrum utilization by allowing unlicensed users to
access the licensed spectrum and to coexist with primary user (PU) while respecting the …

In this paper, we investigate the performance of relay selection in an underlay cognitive
radio system in the presence of primary user (PU) interference. In particular, we consider a …

Cooperative relaying combined with selection exploits spatial diversity to improve the
performance of interference-constrained secondary users in an underlay cognitive radio …

In this paper, we consider amplify-and-forward cognitive relay networks in a spectrum-
sharing environment. We present the performance analysis under two different partial relay …

In this paper, we investigate joint relay selection and power allocation to maximize system
throughput with limited interference to licensed (primary) users in cognitive radio (CR) …

In this paper, we analyze the performance of a cognitive radio network (CRN) that is assisted
by a single relay. In particular, the secondary user (SU) transmitter (SU-Tx) and the …

A relay-aided cooperative underlay cognitive radio system with random number of
secondary users (SU), and an interference constraint at the primary receiver (PR) is …

In this paper, we propose a buffer-aided relay selection scheme with primary sensing ability
in an underlay cognitive radio network. The proposed relay selection scheme is evaluated in …