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Channel Estimation for STAR-RIS-Aided Wireless Communication
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DOI：10.1109/LCOMM.2021.3139198.png)
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Abstract
En 中文
In this letter, we study efficient uplink channel estimation design for a simultaneously transmitting and reflecting reconfigurable intelligent surface (STAR-RIS) assisted two-user communication systems. We first consider the time switching (TS) protocol for STAR-RIS and propose an efficient scheme to separately estimate the channels of the two users with optimized training (transmission/reflection) pattern. Next, we consider the energy splitting (ES) protocol for STAR-RIS under the practical coupled phase-shift model and devise a customized scheme to simultaneously estimate the channels of both users. Although the problem of minimizing the resultant channel estimation error for the ES protocol is difficult to solve, we propose an efficient algorithm to obtain a high-quality solution by jointly designing the pilot sequences, power-splitting ratio, and training patterns. Numerical results show the effectiveness of the proposed designs and reveal that the STAR-RIS under the TS protocol achieves a smaller channel estimation error than the ES case.
Keywords:
Channel estimation
Protocols
Training
Uplink
Wireless communication
Switches
Estimation
Channel estimation
reconfigurable intelligent surface
simultaneous transmission and reflection
Journal
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4.4
Papers:
1.3W
Citations:
2.2W
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