Cramér-Rao Bounds for Near-Field Sensing: A Generic Modular Architecture

A generic modular array architecture is proposed, featuring uniform/non-uniform subarray layouts that allows for flexible deployment. The bistatic near-field sensing system is considered, where the target is located in the near-field of the whole modular array and the far-field of each subarray. The...

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Bibliographic Details
Published in:IEEE wireless communications letters 2024-08, Vol.13 (8), p.2205-2209
Main Authors: Meng, Chunwei, Ma, Dingyou, Chen, Xu, Feng, Zhiyong, Liu, Yuanwei
Format: Article
Language:English
Subjects:
Antenna arrays
Antennas
Apertures
Arrays
Closed form solutions
Computer architecture
Cramer-Rao bounds
Cramér-Rao bounds
Exact solutions
Far fields
generic modular array
Layouts
Modular systems
Near fields
near-field sensing
Pulse width modulation
Sensors
Spherical waves
Vectors
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Summary:A generic modular array architecture is proposed, featuring uniform/non-uniform subarray layouts that allows for flexible deployment. The bistatic near-field sensing system is considered, where the target is located in the near-field of the whole modular array and the far-field of each subarray. Then, the closed-form expressions of Cramér-Rao bounds (CRBs) for range and angle estimations are derived based on the hybrid spherical and planar wave model (HSPM). Simulation results validate the accuracy of the derived closed-form CRBs and demonstrate that: i) The HSPM with varying angles of arrival (AoAs) between subarrays can reduce the CRB for range estimation compared to the traditional HSPM with shared AoA; and ii) The proposed generic modular architecture with subarrays positioned closer to the edges can significantly reduce the CRBs compared to the traditional modular architecture with uniform subarray layout, when the array aperture is fixed.
ISSN:2162-2337
2162-2345
DOI:10.1109/LWC.2024.3406577