Talk: Dr.-Ing. Alexander Fengler (January 11, 2023 at 2:00 PM, Seminar room N2409, Zoom)
Coding for unsourced multiple-access
Dr.-Ing. Alexander Fengler
Laboratory for Information & Decision Systems (LIDS)
Massachusetts Institute of Technology, USA.
The unsourced paradigm has evolved in the last few years as a method to simplify the physical layer in a way that suits massive machine type traffic. Such traffic is often characterised by short, bursty, and uncoordinated transmission of many devices. Coding theoretically “unsourced" means that each device uses the same codebook and the receiver recovers a list of messages up to permutation. In this talk I will give a short overview of coding techniques for the unsourced multiple-access channel (UMAC) and then present recent results on LDPC code construction for the two-user MAC. The same codebook constraint makes the joint Tanner graph consist of two copies of the same graph. This introduces some unique challenges in the analysis and design of suitable code ensembles.
Dr.-Ing. Alexander Fengler received his doctoral degree from the Technical University Berlin. He is currently a post-doctoral fellow at the Laboratory on Information and Decision Systems at the Massachusetts Institute of Technology where he is working on the design and analysis of novel protocols for uncoordinated multi-user communication.