Performance Analysis for Near-Field MIMO: Discrete and Continuous Aperture Antennas
Abstract
Performance analysis is carried out in a near-field multiple-input multiple-output (MIMO) system for both discrete and continuous aperture antennas. The effective degrees of freedom (EDoF) is first derived. It is shown that near-field MIMO systems have a higher EDoF than free-space far-field ones. Additionally, the near-field EDoF further depends on the communication distance. Based on the derived EDoF, closed-form expressions of channel capacity with a fixed distance are obtained. As a further advance, with randomly deployed receivers, ergodic capacity is derived. Simulation results reveal that near-field MIMO has an enhanced multiplexing gain even under line-of-sight transmissions. In addition, the performance of discrete MIMO converges to that of continuous aperture MIMO.
Cite
@article{arxiv.2304.06141,
title = {Performance Analysis for Near-Field MIMO: Discrete and Continuous Aperture Antennas},
author = {Ziyi Xie and Yuanwei Liu and Jiaqi Xu and Xuanli Wu and Arumugam Nallanathan},
journal= {arXiv preprint arXiv:2304.06141},
year = {2023}
}
Comments
6 pages, 4 figures. This is the long version of the paper which published in IEEE Wireless Communications Letters with the same title