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

被引：0
|
作者：
Meng, Chunwei [1 ]
Ma, Dingyou [1 ]
Chen, Xu [2 ]
Feng, Zhiyong [1 ]
Liu, Yuanwei [3 ]
机构：
[1] Beijing Univ Posts & Telecommun, Key Lab Universal Wireless Commun, Minist Educ, Beijing 100876, Peoples R China
[2] China Acad Informat & Telecommun Technol, Innovat Ctr Mobile Commun, Beijing 100191, Peoples R China
[3] Queen Mary Univ London, Sch Elect Engn & Comp Sci, London E1 4NS, England
来源：
IEEE WIRELESS COMMUNICATIONS LETTERS | 2024年 / 13卷 / 08期
基金：
中国国家自然科学基金;
关键词：
Cramer-Rao bounds; generic modular array; near-field sensing;
D O I：
10.1109/LWC.2024.3406577
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
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 Cramer-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.
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页码：2205 / 2209
页数：5
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