The commercial fifth-generation (5G) wireless communications networks have already been
deployed with the aim of providing high data rates. However, the rapid growth in the number …

A High Altitude Platform Station (HAPS) is a network node that operates in the stratosphere
at an of altitude around 20 km and is instrumental for providing communication services …

In the fifth generation (5G) of wireless communication systems, hitherto unprecedented
requirements are expected to be satisfied. As one of the promising techniques of addressing …

Massive machine-type communications (mMTC) is one of the main three focus areas in the
5th generation (5G) of wireless communications technologies to enable connectivity of a …

Driven by the rapid escalation of the wireless capacity requirements imposed by advanced
multimedia applications (eg, ultrahigh-definition video, virtual reality, etc.), as well as the …

Millimeter wave (mmWave) communications have recently attracted large research interest,
since the huge available bandwidth can potentially lead to the rates of multiple gigabit per …

Non-orthogonal multiple access (NOMA) is one of the promising radio access techniques for
performance enhancement in next-generation cellular communications. Compared to …

Reconfigurable intelligent surface (RIS) is a revolutionary technology to achieve spectrum-,
energy-, and cost-efficient wireless networks. This paper considers an RIS-assisted …

As the latest member of the multiple access family, non-orthogonal multiple access (NOMA)
has been recently proposed for 3GPP LTE and is envisioned to be an essential component …

Non-orthogonal multiple access (NOMA) has recently been considered as a key enabling
technique for 5G cellular systems. In NOMA, by exploiting the channel gain differences …