Efficient Channel Estimation for Rotatable Antenna-Enabled Wireless Communication
Xue Xiong, Beixiong Zheng, Wen Wu, Xiaodan Shao, Liang Dai, Ming-Min Zhao, and Jie Tang

TL;DR
This paper introduces an efficient channel estimation method for rotatable antenna systems that adaptively adjusts antenna orientations to improve CSI accuracy and overall communication performance.
Contribution
It proposes a novel adaptive channel estimation scheme that sequentially estimates CSI and optimally adjusts antenna orientations for enhanced performance.
Findings
Outperforms benchmark schemes in simulation
Improves channel estimation accuracy
Enhances effective channel gain
Abstract
Non-fixed flexible antenna architectures, such as fluid antenna system (FAS), movable antenna (MA), and pinching antenna, have garnered significant interest in recent years. Among them, rotatable antenna (RA) is a promising antenna architecture that exploits additional spatial degrees of freedom (DoFs) to enhance the communication performance. To fully obtain the performance gain provided by RAs, accurate channel state information (CSI) is essential for adjusting the orientation/boresight of each antenna. In this letter, we propose an efficient channel estimation scheme for RA communication systems, where the base station (BS) can sequentially and adaptively adjust the orientations of RAs to enrich the environmental observations from diverse angular perspectives, thereby enhancing the channel estimation accuracy. The proposed scheme includes two main procedures that are conducted…
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Taxonomy
TopicsAdvanced MIMO Systems Optimization · Direction-of-Arrival Estimation Techniques · Indoor and Outdoor Localization Technologies
