In this paper, the non-orthogonal multiple access (NOMA) technology is integrated into
cognitive orthogonal frequency-division multiplexing (OFDM) systems, called cognitive …

In this paper we study the resource allocation in multiuser orthogonal frequency division
multiplexing (OFDM)-based cognitive radio (CR) networks, where secondary users (SUs) …

The integration between orthogonal frequency division multiple access (OFDMA), non-
orthogonal multiple access (NOMA), and cognitive radio (CR) technology has been recently …

We study the resource-allocation problem in a multiuser orthogonal frequency-division
multiplexing (OFDM)-based cognitive radio (CR) system using a cross-layer approach. The …

In this paper, we investigate the resource allocation algorithm design for cooperative
cognitive relaying multicarrier non-orthogonal multiple access (MC-NOMA) systems. In …

This paper considers the problem of radio resource allocation in an orthogonal frequency-
division multiple access based cognitive radio (CR) network that opportunistically operates …

This paper investigates an energy efficiency optimization problem in cognitive orthogonal
frequency division multiplexing systems. The goal is to maximize the energy efficiency by …

In this paper, we consider a two-hop relay-assisted cognitive downlink Orthogonal frequency-
division multiple access (OFDMA) system (named as secondary system) dynamically …

We study the resource allocation (RA) problem in a multiuser OFDM-based cognitive radio
(CR) system for non-realtime (NRT) applications in which average user data rates are to be …

In order to enhance the capacity and extend the lifetime of nodes for green Internet of Things
(IoT), the non-orthogonal multiple access (NOMA) is applied to cognitive orthogonal …