In this paper, the performance of an underlay multiple-input multiple-output (MIMO) cognitive
radio system is analytically studied. In particular, the secondary transmitter operates in a …

This paper investigates the fundamental capacity limits of opportunistic spectrum-sharing
channels in fading environments. The concept of opportunistic spectrum access is motivated …

This paper presents a novel non-orthogonal multiple access (NOMA) scheme applicable to
the multiple-input multiple-output (MIMO) downlink broadcast system. An optimal iterative …

Non-orthogonal multiple access (NOMA) acquires capacity improvement by utilizing channel
gain difference between paired users. Multiple users are multiplexed into power domain with …

The 3rd Generation Partnership Project (3GPP) has defined Ultra-Reliable Low-Latency
Communication (URLLC) as one of the main objectives of 5G development to satisfy the …

A hybrid spectrum access strategy which is different from traditional underlay or overlay
strategy is proposed for cognitive radio networks. In proposed strategy, the secondary users …

In this study, the problem of resource allocation in multiple‐input multiple‐output–orthogonal
frequency division multiplexing‐based cooperative cognitive radio networks is considered …

In this paper, we investigate a dynamic spectrum sharing problem for the centralized uplink
cognitive radio networks using orthogonal frequency division multiple access. We formulate …

Non-orthogonal multiple access (NOMA) has been envisioned as a promising multiple
access technique for 5G and beyond wireless networks due to its significant enhancement of …

Improper signaling, where real and imaginary parts of the transmit signal are correlated
and/or have unequal power, has received a lot of attention lately because it has been shown …