Two-Timescale Sum-Rate Maximization for Movable Antenna Enhanced Systems

Chen X, Feng B, Wu Y, Ng DWK, Schober R (2025)

Publication Type: Journal article

Publication year: 2025

Journal

IEEE Transactions on Wireless Communications Institute of Electrical and Electronics Engineers (IEEE)

DOI: 10.1109/TWC.2025.3606950

Abstract

This paper studies a novel movable antenna (MA)-enhanced multiuser multiple-input multiple-output downlink system designed to improve wireless communication performance. We aim to maximize the average achievable sum rate through two-timescale optimization exploiting instantaneous channel state information at the receiver (I-CSIR) for receive antenna position vector (APV) design and statistical channel state information at the transmitter (S-CSIT) for transmit APV and covariance matrix design. We first decompose the resulting stochastic optimization problem into a series of short-term problems and one long-term problem. Then, a gradient ascent algorithm is proposed to obtain suboptimal receive APVs for the short-term problems for given I-CSIR samples. Based on the output of the gradient ascent algorithm, a series of convex objective/feasibility surrogates for the long-term problem are constructed and solved utilizing the constrained stochastic successive convex approximation (CSSCA) algorithm. Furthermore, we propose a planar movement mode for the receive MAs to facilitate efficient antenna movement and the development of a low-complexity primal-dual decomposition-based stochastic successive convex approximation (PDD-SSCA) algorithm, which finds Karush-Kuhn-Tucker (KKT) solutions almost surely. Our numerical results reveal that, for both the general and the planar movement modes, the proposed two-timescale MA-enhanced system design significantly improves the average achievable sum rate and the feasibility of the formulated problem compared to benchmark schemes.

Authors with CRIS profile

Robert Schober Lehrstuhl für Digitale Übertragung (IDC)

Involved external institutions

Shanghai Jiao Tong University / 上海交通大学

China (CN) University of New South Wales (UNSW)

Australia (AU)

How to cite

APA:

Chen, X., Feng, B., Wu, Y., Ng, D.W.K., & Schober, R. (2025). Two-Timescale Sum-Rate Maximization for Movable Antenna Enhanced Systems. IEEE Transactions on Wireless Communications. https://doi.org/10.1109/TWC.2025.3606950

MLA:

Chen, Xintai, et al. "Two-Timescale Sum-Rate Maximization for Movable Antenna Enhanced Systems." IEEE Transactions on Wireless Communications (2025).

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