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The radiative near-field and integration of sensing capabilities are seen astwo key components of the next generation of wireless communication systems. Inthis paper, the sensing performance of a narrowband near-field system isinvestigated for several practical antenna array geometries and configurations,namely SIMO/MISO and MIMO. In the SIMO/MISO configuration, the antenna apertureis exploited only a single time for either transmit or receive signalprocessing, while the MIMO configuration exploits both TX and RX processing.Analytical derivations, supported by simulations, show that the MIMO processingimproves the maximum near-field range and sensing resolution by approximately afactor of 1.4 as compared to single-aperture systems. The value of theimprovement factor is consistent for all considered array geometries. Finally,using a quadratic approximation of the array factor, an analytical improvementfactor of $\sqrt{2}$ is derived, clarifying the observed improvements andvalidating the numerical results.

Range Resolution of Near-field MIMO Sensing