76 citations · 139 across the 23 of their papers we have counts for
20 papers · 1 filter
Capacity Bounds for the Poisson-Repeat Channel
Mohammad Kazemi, Tolga M. Duman
We develop bounds on the capacity of Poisson-repeat channels (PRCs) for which each input bit is independently repeated according to a Poisson distribution. The upper bounds are obt…
Channels with Markov Synchronization Errors: Information Stability and Capacity Bounds
Ruslan Morozov, Tolga M. Duman
Particularly motivated by DNA storage channels, we consider channels with synchronization errors modeled as insertions and deletions, along with substitutions. We focus on the case…
Unsourced Random Access Using Multiple Stages of Orthogonal Pilots: MIMO and Single-Antenna Structures
Mohammad Javad Ahmadi, Mohammad Kazemi, Tolga M. Duman
We study the problem of unsourced random access (URA) over Rayleigh block-fading channels with a receiver equipped with multiple antennas. We propose a slotted structure with multi…
Approximate Weight Distribution of Polarization-Adjusted Convolutional (PAC) Codes
Sadra Seyedmasoumian, Tolga M. Duman
Polarization-adjusted convolutional (PAC) codes combine the polar and convolutional transformations to enhance the distance properties of polar codes. They offer a performance very…
Unsourced Random Access with a Massive MIMO Receiver Using Multiple Stages of Orthogonal Pilots
Mohammad Javad Ahmadi, Tolga M. Duman
We study the problem of unsourced random access (URA) over Rayleigh block-fading channels with a receiver equipped with multiple antennas. We employ multiple stages of orthogonal p…
Random Spreading for Unsourced MAC with Power Diversity
Mohammad Javad Ahmadi, Tolga M. Duman
We propose an improvement of the random spreading approach with polar codes for unsourced multiple access. Each user encodes its message by a polar code, and the coded bits are the…