Energy-Efficiency Maximization for STAR-RIS Enabled Cell-Free Symbiotic Radio Communications

被引:2
作者
Lyu, Bin [1 ,2 ]
Zhou, Chao [1 ]
Gong, Shimin [3 ,4 ]
Wu, Wei [4 ]
Hoang, Dinh Thai [5 ]
Niyato, Dusit [6 ]
机构
[1] Nanjing Univ Posts & Telecommun, Sch Commun & Informat Engn, Nanjing 210003, Peoples R China
[2] Nanjing Univ Posts & Telecommun, Jiangsu Engn Res Ctr Commun & Network Technol, Nanjing 210003, Peoples R China
[3] Sun YatUsen Univ, Sch Intelligent Syst Engn, Shenzhen 518000, Peoples R China
[4] Guangdong Prov Key Lab Fire Sci & Intelligent Emer, Guangzhou 510006, Peoples R China
[5] Univ Technol Sydney, Sch Elect & Data Engn, Sydney, NSW 2007, Australia
[6] Nanyang Technol Univ, Coll Comp & Data Sci, Singapore, Singapore
基金
中国国家自然科学基金; 新加坡国家研究基金会;
关键词
Wireless communication; Array signal processing; 6G mobile communication; Symbiosis; Receivers; Quality of service; Interference; Symbiotic radio; cell-free; reconfigurable intelligent surface; simultaneous transmission and reflection; beamforming design; RECONFIGURABLE INTELLIGENT SURFACES; RATE-REGION; FRAMEWORK; DESIGN;
D O I
10.1109/TCCN.2024.3401719
中图分类号
TN [电子技术、通信技术];
学科分类号
0809 ;
摘要
This paper proposes a simultaneously transmitting and reflecting reconfigurable intelligent surface (STAR-RIS) enabled scheme for a cell-free symbiotic radio (SR) system. In the considered system, multiple access points (APs) are positioned on opposite sides of the STAR-RIS for cooperative primary transmission to the information receiver (IR). The STAR-RIS is set up to support the primary transmission by providing extra transmission links through simultaneous transmission and reflection. Additionally, it can send its own data to the IR by catching a ride over the primary signals. We take both perfect channel state information (CSI) and imperfect CSI scenarios into consideration. For each scenario, we formulate a primary system energy efficiency (EE) maximization problem to optimize each active beamforming constructed by the APs and the passive transmission and reflection beamforming established by the STAR-RIS. Then, a framework for alternating optimization with efficient techniques is proposed to address the non-convex problem, ensuring a nearly optimal solution. According to numerical results, the proposed scheme can improve the EE for the considered system 3.1 times greater than that of the scheme maximizing the total primary system rate. Moreover, the numerical results also reveal the negative effect of the CSI errors on the system performance.
引用
收藏
页码:2209 / 2223
页数:15
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