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Exploiting Reconfigurable Intelligent Surface-Based Uplink/Downlink Wireless Systems
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DOI：10.1109/ACCESS.2022.3202300.png)
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摘要
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This paper analyzes the performance of an uplink/downlink reconfigurable intelligent surface (RIS)-based wireless system with a multiple-antenna base station (B), where the RIS selection strategy is considered to alleviate the overhead and resources. With the goal of enhancing system performance, we consider maximal-ratio-combining (MRC) and selection-combining (SC) for the uplink transmission and maximum-ratio-transmission (MRT) along with beamforming design for the downlink transmission, where two methods of direct-path beamforming design (DBD) and reflective-path beamforming design (RBD) are proposed. We also quantify the impact of uncertain phase shift (UPS) and optimal phase shift (OPS) alignments. Accordingly, closed-form expressions for outage probability (OP) of each uplink and downlink scenario are derived. Numerical results show that, in the uplink transmission, adopting MRC at the B and OPS at RIS provides the best performance. For small antenna settings, using SC-enabled OPS provides outstanding performance when compared to employing MRC-integrated UPS. In downlink transmission, RBD achieves better performance than that of DBD. Similar to the uplink transmission, employing MRT at the B and OPS at the RIS also attains superior performance when compared to UPS.
Keyword:
Uplink
Downlink
Array signal processing
Wireless communication
Uninterruptible power systems
Signal to noise ratio
Probability density function
Power outages
Reconfigurable intelligent surfaces
Outage probability (OP)
reconfigurable intelligent surface (RIS)
selection-combining (SC)
maximal-ratio-combining (MRC)
maximum-ratio-transmission (MRT)
期刊
IF:
3.6
论文数:
9.8W
被引数:
29.4W
机构
引用论文
Performance Analysis of Reconfigurable Intelligent Surface-Assisted Wireless Systems and Comparison With Relaying.png)
IEEE ACCESSOAAI
IEEE ACCESSIF3.6
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