Effective DoF-Oriented Optimal Antenna Spacing in Near-Field XL-MIMO Systems

Cunhua Pan; Hong Ren; Jiangzhou Wang; Xianzhe Chen; Zhangjie Peng

Effective DoF-Oriented Optimal Antenna Spacing in Near-Field XL-MIMO Systems

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arxiv 2501.07062 v1 pith:23ZX4YSK submitted 2025-01-13 eess.SP

Xianzhe Chen , Hong Ren , Cunhua Pan , Zhangjie Peng , Jiangzhou Wang This is my paper · ORCID

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This letter investigates the optimal antenna spacing for a near-field XL-MIMO communication system from the perspective of the array gain. Specifically, using the Green's function-based channel model, the letter analyzes the channel capacity, which is related to the effective degrees-of-freedom (EDoF). Then, the letter further investigates the applicability of two EDoF estimation methods. To increase EDoF, this letter focuses on analyzing the impact of antenna spacing. Furthermore, from the perspective of the array gain, the letter derives an approximate closed-form expression of the optimal antenna spacing, at which EDoF is maximized and the array gain at the antenna nearest to the focused antenna of the transmit array becomes zero. Finally, numerical results verify the main results of this letter.

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