In this letter, a cooperative underlay cognitive non-orthogonal multiple access (NOMA)-
based coordinated direct and relay transmission is investigated. Specifically, exact closed …

It is challenging for the base station (BS) to serve multiple cell-edge users concurrently with
data rate guarantee due to limited power and spectrum resource. Using the relay enhances …

The aim of this paper is to study how to enlarge the performance gap between non-
orthogonal multiple access (NOMA) and conventional orthogonal multiple access (MA) by …

Nonorthogonal multiple access (NOMA) represents a paradigm shift from conventional
orthogonal multiple-access (MA) concepts and has been recognized as one of the key …

The primary objective of cognitive radio network is to effectively utilize the unused spectrum
bands. In cognitive radio networks, spectrum sharing between primary and secondary users …

This article studies the interweave cognitive network with non-orthogonal multiple access
(NOMA) principle under the appearance of one eavesdropper. The best relay selection …

Cooperative non-orthogonal multiple access (NOMA) assisted by a dedicated relay is an
effective way to improve the spectral efficiency and reliability of a cognitive radio network …

In this article, the performance of cognitive radio system benefits from non-orthogonal
multiple access (NOMA) scheme. We then examine system metrics to adjust its quality of …

In uplink non-orthogonal multiple access (NOMA) channels, the existing cooperative
successive interference cancellation (SIC) and power control (PC) schemes lack the …

To solve the contradiction between limited spectrum resources and increasing
communication demand, this paper proposes a wireless resource allocation scheme based …