Abstract
This paper presents a detailed investigation on the performance of reconfigurable intelligent surface (RIS)-assisted communication system with user scheduling. Depending on the availability of channel state information (CSI) at the RIS, two separate scenarios are considered, namely without CSI and with CSI. Closed-form expressions are derived for the ergodic capacity of the system in both scenarios. It is found that CSI has a significant impact on the performance of the system. Without CSI, the RIS provides an array gain of N, where N is the number of reflecting elements, and user scheduling provides an multi-user gain of log logM, where M is the number of users. With CSI, the RIS provides an array gain of N2, while no multi-user diversity gain can be obtained.
Original language | English |
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Pages (from-to) | 1353-1357 |
Journal | IEEE Communications Letters |
DOIs | |
Publication status | Published - 1 Jan 2021 |
Externally published | Yes |
Keywords
- Electrical and Electronic Engineering
- Modeling and Simulation
- Computer Science Applications