Grant-free (GF) access has been one of the enablers for the various use cases in 5th
generation (5G) mobile system, especially for time-critical massive machine-type …

This paper investigates the dense multi-user sparse code multiple access (SCMA) cellular
networks, where base stations (BSs) and users are randomly deployed in a 3D space by …

The performance of grant-free random access (GF-RA) is limited by the number of
accessible random access resources (RRs) due to the absence of collision resolution …

Contention-based grant-free transmission is very promising for future massive machine-type
communication (mMTC). In contention-based transmission, the random pilot collision …

In this paper, the concept of faster-than Nyquist (FTN) transmission is used as a non-
orthogonal multiple access scheme to interlace sporadic traffic into a broadband service …

Multiple-Input Multiple-Output (MIMO) technology is a cornerstone of the Fifth Generation
Mobile Systems (5G) wireless communication systems. Although it offers significant gains in …

The application of multi-sequence spreading technology in grant-free non-orthogonal
multiple access can significantly improve resource utilization in 5G. However, in grant-free …

This paper presents a method to interlace a sporadic traffic into a broadband traffic so that
radio resources can be efficiently shared by both, beyond the Nyquist rate. The concept of …