This paper studies the achievable cognitive sum rate of an overlay cognitive radio (CR)
system assisted with multiple antennas two-way relays in which primary users (PUs) …

In this paper, the problem of both bandwidth and power allocation for two-way multiple relay
systems in overlay cognitive radio (CR) setup is investigated. In the CR overlay mode …

In this paper, we propose a spectrum sharing mechanism with a two-phase two-way relaying
protocol for an overlay cognitive network. The system comprises two primary users (PUs) …

In this paper, for an overlay cognitive radio network in which the primary user's transmission
is assisted by a cognitive multi-hop multi-branch network, we propose and analyze a …

In this paper, we consider a relay-assisted wideband cognitive-radio (CR) system under the
assumption that the frequency band chosen by the CR relay network for unlicensed …

In this paper, for an overlay cognitive radio system in which the primary users' information
exchange is assisted by a secondary multiple-input multiple-output two-way relay network …

We consider the overlay cognitive radio channel where the cognitive user is admitted to
transmit simultaneously with the primary user provided that the instantaneous rate of primary …

This paper considers a cooperative and cognitive radio (CCR) system where two secondary
users (SUs) exchange their information through a" cognitive" relay station (RS) via the two …

A relay-aided cooperative underlay cognitive radio system with an interference constraint at
the primary receiver (PR) is considered. When the primary user (PU) is active, those …

In this paper, we present an optimal scheme for power allocation and relay selection in a
cognitive radio network where a pair of cognitive (or secondary) transceiver nodes …