2019/07/19 by Abdelhamid Salem, Christos Masouros, Salem, Abdelhamid +3
Computer Science · Engineering · #Advanced MIMO Systems Optimization #Cooperative Communication and Network Coding #Energy Harvesting in Wireless Networks #FOS: Computer and information sciences #FOS: Electrical engineering #Information Theory (cs.IT) #Signal Processing (eess.SP) #electronic engineering #information engineering
paper · pdf · doi:10.48550/arxiv.1907.08457
openalex publication_date 2019/07/19 · openalex created_date 2022/07/28 · openalex updated_date 2026/07/28
Rate-Splitting (RS) has been proposed recently to enhance the performance of\nmulti-user multiple-input multiple-output (MU-MIMO) systems. In RS, a user\nmessage is split into a common and a private part, where the common part is\ndecoded by all users, while the private part is decoded only by the intended\nuser. In this paper, we study RS under a phase-shift keying (PSK) input\nalphabet for multi-user multi-antenna system and propose a constructive\ninterference (CI) exploitation approach to further enhance the sum-rate\nachieved by RS under PSK signaling. To that end, new analytical expressions for\nthe ergodic sum-rate are derived for two precoding techniques of the private\nmessages, namely, 1) a traditional interference suppression zero-forcing (ZF)\nprecoding approach, 2) a closed-form CI precoding approach. Our analysis is\npresented for perfect channel state information at the transmitter (CSIT), and\nis extended to imperfect CSIT knowledge. A novel power allocation strategy,\nspecifically suited for the finite alphabet setup, is derived and shown to lead\nto superior performance for RS over conventional linear precoding not relying\non RS (NoRS). The results in this work validate the significant sum-rate gain\nof RS with CI over the conventional RS with ZF and NoRS.\n