RATE SPLITTING FOR INTERFERENCE CHANNELS WITH DEEP REINFORCEMENT LEARNING

2024-1-24
Irkıçatal , Osman Nuri
In recent advancements within communication systems, the rate-splitting multiple access (RSMA) technique has emerged as a crucial strategy to address interference, a persistent challenge in modern communication systems. This study examines the detailed application of precoding methodologies within RSMA, focusing on the complex environment of multiple-antenna interference channels and leveraging the capabilities of deep reinforcement learning. The primary objective is to optimize precoders and allocate transmit power for both common and private data streams, requiring a nuanced approach involving multiple decision-makers within a continuous action space. To address this challenge, the study proposes the utilization of a multi-agent deep deterministic policy gradient (MADDPG) framework. Within this framework, decentralized agents operate with partial observability but collectively learn from a centralized critic, navigating a multi-dimensional continuous policy space to optimize actions. Simulation outcomes highlight the effectiveness of the proposed rate-splitting method, achieving the information-theoretical upper bound for the sum rate in the single-antenna scenario. Even in multiple-antenna settings, its performance closely approaches this theoretical limit, outperforming benchmarks set by other techniques such as MADDPG without rate-splitting, maximal ratio transmission, zero-forcing, and leakage-based precoding methods. These compelling results emphasize the promising potential of this deep reinforcement learning-driven RSMA approach in communication systems by substantially mitigating interference and optimizing transmission rates and overall system performance.
Citation Formats
O. N. Irkıçatal, “RATE SPLITTING FOR INTERFERENCE CHANNELS WITH DEEP REINFORCEMENT LEARNING,” M.S. - Master of Science, Middle East Technical University, 2024.