This paper considers massive access in massive multiple-input multiple-output (MIMO)
systems and proposes an adaptive active user detection and channel estimation scheme …

Grant-free random access is a promising protocol to support massive access in beyond fifth-
generation (B5G) cellular Internet-of-Things (IoT) with sporadic traffic. Specifically, in each …

This paper investigates the massive random access for a huge amount of user devices
served by a base station (BS) equipped with a massive number of antennas. We consider a …

With the rapid development of Internet of Things (IoT), low earth orbit (LEO) satellite IoT is
expected to provide low power, massive connectivity and wide coverage IoT applications. In …

Grant-free access is a key enabler for connecting wireless devices with low latency and low
signaling overhead in massive machine-type communications (mMTC). For massive grant …

The Internet of Things promises the massive connectivity of everything ubiquitously,
whereas enabling massive machine-type communications (mMTC) is one of the paramount …

We propose a new grant-free non-orthogonal multiple access (GF-NOMA) scheme, which
makes full use both of the time and of the delay domains for further enhancement on low …

This paper describes the ongoing standardization of the new 5G system and the planned
next steps in the 3rd Generation Partnership Project (3GPP) groups. Starting with an …

In this dissertation, we consider a grant-free non-orthogonal multiple access (GFNOMA)
system based on compressed sensing (CS), aiming to simultaneously satisfy massive …