Flexible Precoding for Multi-User Movable Antenna Communications
<|reference_start|>Flexible Precoding for Multi-User Movable Antenna Communications: This letter rethinks traditional precoding in multi-user wireless communications with movable antennas (MAs). Utilizing MAs for optimal antenna positioning, we introduce a sparse optimization (SO)-based approach focusing on regularized zero-forcing (RZF). This framework targets the optimization of antenna positions and the precoding matrix to minimize inter-user interference and transmit power. We propose an off-grid regularized least squares-based orthogonal matching pursuit (RLS-OMP) method for this purpose. Moreover, we provide deeper insights into antenna position optimization using RLS-OMP, viewed from a subspace projection angle. Overall, our proposed flexible precoding scheme demonstrates a sum rate that exceeds more than twice that of fixed antenna positions.<|reference_end|>
@article{yang2024flexible,
    title={Flexible Precoding for Multi-User Movable Antenna Communications},
    author={Songjie Yang, Wanting Lyu, Boyu Ning, Zhongpei Zhang, and Chau Yuen},
    journal={IEEE Wireless Communications Letters (2024)},
    year={2024},
    doi={10.1109/LWC.2024.3372569},
    archivePrefix={arXiv},
    eprint={2402.18847},
    primaryClass={cs.IT eess.SP math.IT}
}