Modeling and Performance Analysis for Movable Antenna Enabled Wireless Communications
By Lipeng Zhu, Wenyan Ma, Rui Zhang. IEEE Transactions on Wireless Communications, 2022
593 citations recorded by the source corpus.
In this paper, we propose a novel antenna architecture called movable antenna (MA) to improve the performance of wireless communication systems. Different from conventional fixed-position antennas (FPAs) that undergo random wireless channel variation, the MAs with the capability of flexible movement can be deployed at positions with more favorable channel conditions to achieve higher spatial diversity gains. To characterize the general multi-path channel in a given region or field where the MAs are deployed, a field-response model is developed by leveraging the amplitude, phase, and angle of arrival/angle of departure (AoA/AoD) information on each of the multiple channel paths under the far-field condition. Based on this model, we then analyze the maximum channel gain achieved by a single receive MA as compared to its FPA counterpart in both deterministic and stochastic channels. First, in the deterministic channel case, we show the periodic behavior of the multi-path channel gain in a given spatial field, which can be exploited for analyzing the maximum channel gain of the MA. Next, in the case of stochastic channels, the expected value of an upper bound on the maximum channel gain of the MA in an infinitely large receive region is derived for different numbers of channel paths. The approximate cumulative distribution function (CDF) for the maximum channel gain is also obtained in closed form, which is useful to evaluate the outage probability of the MA system. Moreover, our results reveal that higher performance gains by the MA over the FPA can be acquired when the number of channel paths increases due to more pronounced small-scale fading effects in the spatial domain. Numerical examples are presented which validate our analytical results and demonstrate that the MA system can reap considerable performance gains over the conventional FPA systems with/without antenna selection (AS), and even achieve comparable performance to the single-input multiple-output (SIMO) beamforming system.
Subfields: Aerospace Engineering, Electrical and Electronic Engineering
View Paper: https://www.semanticscholar.org/paper/8a1ce5b79e311f0f628c5221d80397c26a4b768f
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Citations in the corpus
- A Tutorial on Fluid Antenna System for 6G Networks: Encompassing Communication Theory, Optimization Methods and Hardware Designs (2024, background): “3) Movable Antenna System: This is an emerging wireless system where the antenna positions are flexibly adjusted within a spatial region to enhance channel conditions and communication performance [79], [80].”
- Movable-Antenna Enhanced Multiuser Communication via Antenna Position Optimization (2023, methodology): “Thus, the field-response based channel model in [9] is adopted to enable the MA position optimization for multiple users, whereas the channel model is extended from 2D surface to 3D space.”
- 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].”
- MIMO Capacity Characterization for Movable Antenna Systems (2022, methodology): “Besides, the field-response-based channel model and MA architecture were proposed for the single-MA system in [27], where the SNR gain over its FPA counterpart was investigated under both deterministic and stochastic channels.”
- Movable Antennas for Wireless Communication: Opportunities and Challenges (2023, methodology): “In particular, the angle of departure (AoD), the angle of arrival (AoA), and the amplitude of the complex coefficient associated with each channel path between the Tx and Rx can be assumed to be constant over their residing regions, regardless of the positions of the MAs therein [2].”