상세정보
학술지
Cell-Free MIMO Systems Powered by Intelligent Reflecting Surfaces
- 저자
- 노태균, 최준일
- 발행일
- 202205
- 출처
- IEEE Communications Letters, v.26 no.5, pp.1076-1080
- ISSN
- 1089-7798
- 출판사
- IEEE
- 협약과제
- 22HH1700, [통합과제] 5G NR 기반 지능형 오픈 스몰셀 기술 개발, 나지현
- 초록
- Cell-free massive multiple-input multiple-output (MIMO) and intelligent reflecting surface (IRS) are considered as the prospective multiple antenna technologies for beyond the fifth-generation (5G) networks. Cell-free MIMO systems powered by IRSs, combining both technologies, can further improve the performance of cell-free MIMO systems at low cost and energy consumption. Prior works focused on instantaneous performance metrics and relied on alternating optimization algorithms, which impose huge computational complexity and signaling overhead. To address these challenges, we propose a novel two-step algorithm that provides the long-term passive beamformers at the IRSs using statistical channel state information (S-CSI) and short-term active precoders and long-term power allocation at the access points (APs) to maximize the minimum achievable rate. Simulation results verify that the proposed scheme outperforms benchmark schemes and brings a significant performance gain to the cell-free MIMO systems powered by IRSs.
- KSP 제안 키워드
- Access point, Achievable rate, Antenna technologies, Channel State Information(CSI), Computational complexity, Fifth Generation(5G), Low-cost, MIMO system, Multiple input multiple output(MIMO), Optimization algorithm, Performance gain