Communication and Information Theory
Speaker: Professor Seok-Hwan Park
Affiliation: Korea University
Uplink Sum-Rate Analysis of C-RAN With Interconnected Radio Units
This study addresses the achievable sum-rate for the uplink of a cloud radio access network (C-RAN) 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 options are also provided in the presence of compression schemes leveraging side information. Numerical examples provide insights into the advantages of inter-RU communications and into the performance gap to sum-rate upper bounds.
* Joint work with Osvaldo Simeone (King’s College London), Shlomo Shamai (Shitz) (Technion).