In this paper, we evaluate two-way relay communication systems in cognitive radio
environments. The proposed model includes two subsystems: a primary system and a …

Several works have studied relaying in cognitive radio networks in terms of outage
probability. The main challenge in such works is finding a mathematical expression for this …

A cooperative bidirectional relaying scheme based on relay beamforming is proposed for an
underlay cognitive relay network (CRN) which consists of two secondary transceivers and K …

This paper analyses the outage performance of a multihop relay-based cognitive radio
network under imperfect channel state information. A backoff power control scheme is …

In this article, we study an orthogonal frequency division multiplexing‐based underlay
cognitive two‐way amplify‐and‐forward (AF) relay network. We assume a system model …

In this paper, we explore the underlay cognitive relay networks in the presence of hardware
impairment. To avoid interfering with the primary user's communications, the transmission …

This work studies the impact of a multi-relay scheme and co-channel interference (CCI) on
the performance of a dual-hop underlay cognitive radio (CR) network. An amplify-and …

This letter presents the outage performance analysis for a cognitive relay network (CRN)
with imperfect channel knowledge estimations. Under the condition of imperfect channel …

In this paper, an adaptive two-way relay cooperation scheme is studied for multiple-relay
cognitive radio networks to improve the performance of secondary transmissions. The power …

In this paper, we investigate the outage performance of underlay cognitive dual-hop relaying
systems under the effect of using statistical instead of instantaneous information of the …