Analyzing URA geometry for enhanced spatial multiplexing and extended near-field coverage

Hussain, Ahmed, Abdallah, Asmaa, Celik, Abdulkadir and Eltawil, Ahmed M. (2025) Analyzing URA geometry for enhanced spatial multiplexing and extended near-field coverage. In 2025 IEEE 36th International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 2025. IEEE.. (doi:10.1109/PIMRC62392.2025.11275028).

Abstract

With the deployment of large antenna arrays at high-frequency bands, future wireless communication systems are likely to operate in the radiative near-field. Unlike far-field beam steering, near-field beams can be focused within a spatial region of finite depth, enabling spatial multiplexing in both the angular and range dimensions. This paper derives the beamdepth for a generalized uniform rectangular array (URA) and investigates how array geometry influences the near-field beamdepth and the limits where near-field beamfocusing is achievable. To characterize the near-field boundary in terms of beamfocusing and spatial multiplexing gains, we define the effective beamfocusing Rayleigh distance (EBRD) for a generalized URA. Our analysis reveals that while a square URA achieves the narrowest beamdepth, the EBRD is maximized for a wide or tall URA. However, despite its narrow beamdepth, a square URA may experience a reduction in multiuser sum rate due to its severely constrained EBRD. Simulation results confirm that a wide or tall URA achieves a sum rate of 3.5× more than that of a square URA, benefiting from the extended EBRD and improved spatial multiplexing capabilities.

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Contributors

Author: Abdulkadir Celik

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