This paper studies overlay-based cognitive radio networks (ObCRNs) where transmission
from a licensed transmitter (LT) to a licensed receiver (LR) is supported by an unlicensed …

In this paper, considering a relay assisted hybrid overlay/underlay cognitive radio system
with peak interference power constraints for protecting the primary system, the upper bound …

In the presented paper, we propose a joint underlay/overlay cognitive radio (CR) network
model assisted by adaptive hybrid relays (AHR) which are incorporated with multiple …

This work investigates two important performance metrics of underlay cooperative cognitive
radio (CR) networks: Interference cumulative distribution function of licensed users and …

This paper investigates outage performance under overlay spectrum mode using relay-
assisted network model. Without harming the performance of the primary user (PU) …

Cognitive radio aims to increase spectral efficiency by exploiting information about the
environment and activity of other transmitters. It allows access to temporary and/or spatially …

Efficiently allocating the scarce and expensive radio resources is a key challenge for
advanced radio communication systems. To this end, cognitive radio (CR) has emerged as a …

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 study, we investigate the outage capacity of a cooperative relaying based cognitive
radio network in slow fading channel. Our network scenario consists of a primary transmitter …

The radio spectrum of communication systems is largely occupied by wideband
technologies, and thus, efficient usage of spectrum is a crucial requirement from regulators' …