Abstract
In this paper, we investigate an active reconfigurable intelligent surfaces (RIS)-aided ultra-reliable low-latency communication (URLLC) system, where the active RIS can amplify the incident signals rather than only reflecting them has done in passive modules. By utilizing the Jensen's inequality and the moment-matching method, two closed-form expressions for the average achievable rate and the average decoding error probability are derived with the optimal shift-phase and the optimal amplification factor. Moreover, the derived expressions are utilized to provide some insights, including the power scaling law, the high signal-to-noise ratio (SNR) slope and the diversity order. Simulation results show that the performance of the small-scale active RIS significantly outperforms the large-scale passive RIS in the URLLC system. © 2024 IEEE.
| Original language | English |
|---|---|
| Pages (from-to) | 17842-17847 |
| Journal | IEEE Transactions on Vehicular Technology |
| Volume | 73 |
| Issue number | 11 |
| Online published | 9 Jul 2024 |
| DOIs | |
| Publication status | Published - Nov 2024 |
Research Keywords
- achievable rate
- Active reconfigurable intelligent surface (RIS)
- decoding error probability
- ultra-reliable low-latency communication (URLLC)
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