Multiple access technology plays an important role in communication systems, which can
enable different users to access the system efficiently and reliably. However, the …

In this paper, we study the problem of user activity detection and large-scale fading
coefficient estimation in a random access wireless uplink with a massive MIMO base station …

Multiple access (MA) is a crucial part of any wireless system and refers to techniques that
make use of the resource dimensions to serve multiple users/devices/machines/services …

Age of information (AoI) is gaining attention as a valuable performance metric for many IoT
systems, in which a large number of devices report time-stamped updates to a central …

Unsourced random-access (U-RA) is a type of grant-free random access with a virtually
unlimited number of users, of which only a certain number K a are active on the same time …

We consider the unsourced random access problem on a Rayleigh block-fading AWGN
channel with multiple receive antennas. Specifically, we treat the slow fading scenario …

Sparse regression codes with approximate message passing (AMP) decoding have gained
much attention in recent times. The concepts underlying this coding scheme extend to …

This article is a tutorial introduction to the field of unsourced multiple access (UMAC)
protocols. We first provide a historical survey of the evolution of random access protocols …

Extra large MIMO (XL-MIMO) systems are subject to spatial non-stationarity forming visibility
regions (VRs), which leads to a sub-array-wise sparse structure of the channel matrix. When …

Error correction coding (ie, channel coding) is a key ingredient of any digital
communications system. In mobile wireless communications, channel codes have evolved …