세미나/포럼
[세미나/포럼] [2021.12.8(수)] AI Convergence Network & Artificial Intelligence Colloquium
- 세미나/포럼
- 교내
- 김성민
- 2021-12-06
<AI Convergence Network & Artificial Intelligence Colloquium> * Title : Rate Splitting Multiple Access for Satellite Communications * When : 2021.12.8(WED), P.M. 4:30~ * Where : Zoom - Zoom 회의 참가 https://zoom.us/j/97444017066?pwd=bGg3ZDRpNjBpcm1XOENBZ2R6M2E2UT09 회의 ID: 974 4401 7066 암호: 3647 * Speaker : Prof. Bruno Clerckx (Imperial College London) * Abstract : Rate Splitting Multiple Access (RSMA), based on (linearly or nonlinearly) precoded Rate-Splitting (RS) at the transmitter and Successive Interference Cancellation (SIC) at the receivers, has emerged as a novel, general and powerful framework for the design and optimization of non-orthogonal transmission, multiple access, and interference management strategies in future MIMO wireless networks. RSMA relies on the split of messages and the non-orthogonal transmission of common messages decoded by multiple users, and private messages decoded by their corresponding users. This enables RSMA to softly bridge and therefore reconcile the two extreme strategies of fully decode interference and treat interference as noise. RSMA has been shown to generalize, and subsume as special cases, four seemingly different strategies, namely Space Division Multiple Access (SDMA) based on linear precoding (currently used in 5G), Orthogonal Multiple Access (OMA), Non-Orthogonal Multiple Access (NOMA) based on linearly precoded superposition coding with SIC, and physical-layer multicasting. RSMA boils down to those strategies in some specific conditions, but outperforms them all in general. Through information and communication theoretic analysis, RSMA is shown to be optimal (from a Degrees-of-Freedom region perspective) in a number of scenarios and provides significant room for spectral efficiency, energy efficiency, fairness, reliability, QoS enhancements in a wide range of network loads and user deployments, robustness against imperfect Channel State Information at the Transmitter (CSIT), as well as feedback overhead and complexity reduction over conventional strategies used in 5G. The benefits of RSMA have been demonstrated in a wide range of scenarios (MU-MIMO, massive MIMO, multi-cell MIMO/CoMP, overloaded systems, NOMA, multigroup multicasting, mmwave communications, communications in the presence of RF impairments and superimposed unicast and multicast transmission, relay,…) and systems (terrestrial, cellular, satellite, …). Thanks to its versatility, RSMA has the potential to tackle challenges of modern communication systems and is a gold mine of research problems for academia and industry, spanning fundamental limits, optimization, PHY and MAC layers, and standardization. This lecture will share key principles of RSMA and will specifically focus on emerging applications in satellite communications. More information about RSMA can be found on the IEEE special interest group https://sites.google.com/view/ieee-comsoc-wtc-sig-rsma/home.