Princeton University

School of Engineering & Applied Science

On Uplink Cloud Radio Access Networks With Interconnected Radio Units

Shlomo Shamai, Technion-Israel Institute of Technology
Engineering Quadrangle B205
Friday, February 16, 2018 - 4:00pm

Abstract: We address the achievable sum-rate for the cloud radio access network (C-RAN) uplink operating in a linear Wyner-type topology. In the system, a set of radio units (RUs) is connected to a control unit (CU) by means of digital finite-capacity fronthaul links, and the messages sent by the users equipment (UEs) served by the RUs are jointly decoded at the CU based on the compressed baseband signals received on the fronthaul links.
The potential advantages of utilizing the inter-RU links to improve the sum-rate performance is examined. In the considered strategy, each RU performs in-network processing of the uplink received signal and of the compressed baseband signal received from the adjacent RU, with the CU performing channel decoding incorporating the in-network processing output signals. A closed-form expression of the achievable sum-rate is derived assuming point-to-point compression, and analytic expressions for other advanced compression options, leveraging side information are also provided.
Insights into the advantages of inter-RU communications follow some numerical examples highlighting the performance gap to the associated sum-rate upper bounds.
Joint work with Seok-Hwan Park (Chonbuk National University, Korea) and Osvaldo Simeone (King's College London).
This research was supported by the European Union's Horizon 2020 Research And Innovation Programme under grant agreement no. 694630.
Bio:  Shlomo Shamai (Shitz) received the B.Sc., M.Sc., and Ph.D. degrees in electrical engineering from the Technion---Israel Institute of Technology, in 1975, 1981 and 1986 respectively.
During 1975-1985, he was with the Communications Research Labs, in the capacity of a Senior Research Engineer. Since 1986 he is with the Department of Electrical Engineering, Technion---Israel Institute of Technology, where he is now a Technion Distinguished Professor, and holds the William Fondiller Chair of Telecommunications. His research interests encompass a wide spectrum of topics in information theory and statistical communications.
Dr. Shamai (Shitz) is an IEEE Fellow, an URSI Fellow, a member of the Israeli Academy of Sciences and Humanities and a foreign member of the US National Academy of Engineering. He is the recipient of the 2011 Claude E. Shannon Award, the 2014 Rothschild Prize in Mathematics/Computer Sciences and Engineering and the 2017 IEEE Richard W. Hamming Medal.