Coding and Capacity for Cloud-RAN Downlink Channels

Coding and Capacity for Cloud-RAN Downlink Channels
February, 28, 2018
14:30
Room 1061 Electrical Eng. Building Technion City

Communication and Information Theory

Speaker: Professor Gerhard Kramer
Affiliation: Alexander von Humboldt Professor
TUM, Technical University of Munich

The downlink of a cloud radio access network (C-RAN) can be modeled as a diamond network. The baseband unit (BBU) is connected to remote radio heads (RRHs) via fiber links that are modeled as rate-limited bit pipes. A capacity lower bound is based on Marton’s coding, and a capacity upper bound uses Ozarow’s technique to augment the system with an auxiliary random variable. The bounds characterize the capacity of scalar Gaussian C-RANs for interesting regimes of operation. The bounds are also shown to characterize the capacity of a binary adder channel model for all ranges of bit-pipe capacities, which seems to yield a new combinatorial result on sum sets. Extensions to multiple RRHs are discussed.
The talk is based on joint work with Shirin Saeedi Bidokhti and Shlomo Shamai. This research was supported in part by the European Union’s Horizon 2020 Research And Innovation Programme, grant agreement no. 694630.

Biography
Gerhard Kramer is Alexander von Humboldt Professor and Chair of Communications Engineering at the Technical University of Munich (TUM). He received the B.Sc. and M.Sc. degrees in electrical engineering from the University of Manitoba, Canada, in 1991 and 1992, respectively, and the Dr. sc. techn. degree from the ETH Zurich, Switzerland, in 1998. From 1998 to 2000, he was with Endora Tech AG in Basel, Switzerland, and from 2000 to 2008 he was with the Math Center at Bell Labs in Murray Hill, NJ. He joined the University of Southern California (USC), Los Angeles, CA, as a Professor of Electrical Engineering in 2009. He joined TUM in 2010. Gerhard Kramer’s research interests are primarily in information theory and communications theory, with applications to wireless, copper, and optical fiber networks.

Special lecture sponsored by the Ollendoff Minerva Center.