MIMO Capacity Characterization for Movable Antenna Systems
By Wenyan Ma, Lipeng Zhu, Rui Zhang. IEEE Transactions on Wireless Communications, 2022
471 citations recorded by the source corpus.
In this paper, we propose a new multiple-input multiple-output (MIMO) communication system with movable antennas (MAs) to exploit the antenna position optimization for enhancing the capacity. Different from conventional MIMO systems with fixed-position antennas (FPAs), the proposed system can flexibly change the positions of transmit/receive MAs, such that the MIMO channel between them is reconfigured to achieve higher capacity. We aim to characterize the capacity of MA-enabled point-to-point MIMO communication systems, by jointly optimizing the positions of transmit and receive MAs as well as the covariance of transmit signals. First, we develop an efficient alternating optimization algorithm to find a locally optimal solution by iteratively optimizing the transmit covariance matrix and the position of each transmit/receive MA with the other variables being fixed. Next, we propose alternative algorithms of lower complexity for capacity maximization in the low-SNR regime and for the multiple-input single-output (MISO) and single-input multiple-output (SIMO) cases. Numerical results show that our proposed MA systems significantly improve the MIMO channel capacity compared to traditional FPA systems as well as various benchmark schemes, and useful insights are drawn into the capacity gains of MA systems.
Subfields: Aerospace Engineering, Electrical and Electronic Engineering
View Paper: https://www.semanticscholar.org/paper/eb15d4fbf8aeb6399d4036cd1adad02bb7fcbbb6
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Citations in the corpus
- Flexible-Antenna Systems: A Pinching-Antenna Perspective (2024, unknown): “As the latest members of the flexible-antenna system family, both fluid antennas and movable antennas are based on the idea to change the locations of the antennas at the transceivers, such that more favorable channel conditions are experienced by the transceivers [12], [13], [14], [15].”
- Movable-Antenna Enhanced Multiuser Communication via Antenna Position Optimization (2023, methodology): “Compared to conventional FPA systems, the MA-enabled communication systems have some appealing advantages [9], [10], [19].”
- Movable Antennas for Wireless Communication: Opportunities and Challenges (2023, methodology): “Preliminary studies have shown that MA systems can achieve a considerable performance gain over FPA systems by moving antennas in regions with size of only a few wavelengths [2], [13], [14].”
- A Tutorial on Fluid Antenna System for 6G Networks: Encompassing Communication Theory, Optimization Methods and Hardware Designs (2024, background): “To further understand the performance gain of MIMO-FAS, the readers may refer to [94], [115].”
- Modeling and Performance Analysis for Movable Antenna Enabled Wireless Communications (2022, methodology): “The above advantages of the MA system allow for utilizing wireless channel spatial DoFs more efficiently, thus leading to improved communication performance [12], [13], [14].”