Rate Splitting and Common Message Decoding for MIMO C-RAN Systems
AuthorsAhmad, Alaa Alameer
Al-Naffouri, Tareq Y.
KAUST DepartmentElectrical Engineering Program
Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
Online Publication Date2019-08-30
Print Publication Date2019-07
Permanent link to this recordhttp://hdl.handle.net/10754/658667
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AbstractIn this paper, we study the benefits of rate-splitting (RS) in multiple-input multiple-output (MIMO) cloud radio access networks (C-RAN). For this setting, we propose a stream-based transmission scheme in which user's messages are divided into a private and a common part, each of which is encoded into multiple streams. Under this stream-based strategy, we formulate a weighted sum-rate maximization problem subject to backhaul capacity and transmit power constraints. We determine the beamforming vectors of private and common streams of this non-convex optimization problem via a proposed iterative algorithm based on the fractional programming (FP) framework. Numerical results show gains of up to 27% of RS-MIMO over the baseline scheme of treating interference as noise (TIN). Particularly, at large backhaul capacities and specific antenna settings at which interference levels are maximal, rate splitting along with common message decoding is a viable option for effective interference management in MIMO C-RAN.
CitationAhmad, A. A., Kakar, J., Dahrouj, H., Chaaban, A., Shen, K., Sezgin, A., … Alouini, M.-S. (2019). Rate Splitting and Common Message Decoding for MIMO C-RAN Systems. 2019 IEEE 20th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC). doi:10.1109/spawc.2019.8815579
Conference/Event name20th IEEE International Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2019