As the number of wireless applications and devices grows, higher standards for the quality
of service and navigation performance of mobile networks are required. Numerous critical …

This article presents a comprehensive study on the emerging near-space communications
(NS-COM) within the context of space–air–ground–sea integrated network (SAGSIN) …

With the rapidly increasing number of bandwidth-intensive terminals capable of intelligent
computing and communication, such as smart devices equipped with shallow neural …

Sparse code multiple access (SCMA) has excellent application prospects in satellite-
terrestrial links because of its high spectral efficiency and access capacity. In the end-to-end …

Non-terrestrial networks (NTNs) have become appealing resolutions for seamless coverage
in the next-generation wireless transmission, where a large number of Internet of Things …

Orthogonal time frequency space (OTFS) modulation is strongly considered as a promising
solution for high-mobility communications. In contrast to conventional modulation …

We explore a satellite internet of things (SIoT) system, wherein multiple IoT users are
allowed to access the SIoT in a grant-free manner. Such a manner may incur the severe co …

Nonterrestrial networks (NTN) are pivotal, enabling technologies for achieving global and
ubiquitous connectivity in the sixth generation (6G) of wireless systems. On the other hand …

Satellite communication is an indispensable part of future wireless communications given its
global coverage and long-distance propagation. In satellite communication systems …

High mobility environment leads to severe Doppler effects and poses serious challenges to
the conventional physical layer based on the widely popular orthogonal frequency division …