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arXiv · 2205.10807

Antenna Selection in Switch-Based MIMO Arrays via DOA threshold region Approximation

Hui Chen·Tarig Ballal·Mohammed E. Eltayeb·Tareq Y. Al-Naffouri
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Abstract

Direction-of-arrival (DOA) information is vital for multiple-input-multiple-output (MIMO) systems to complete localization and beamforming tasks. Switched antenna arrays have recently emerged as an effective solution to reduce the cost and power consumption of MIMO systems. Switch-based array architectures connect a limited number of radio frequency chains to a subset of the antenna elements forming a subarray. This paper addresses the problem of antenna selection to optimize DOA estimation performance. We first perform a subarray layout alignment process to remove subarrays with identical beampatterns and create a unique subarray set. By using this set, and based on a DOA threshold region performance approximation, we propose two antenna selection algorithms; a greedy algorithm and a deep-learning-based algorithm. The performance of the proposed algorithms is evaluated numerically. The results show a significant performance improvement over selected benchmark approaches in terms of DOA estimation in the threshold region and computational complexity.

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Hui Chen, Tarig Ballal, Mohammed E. Eltayeb, Tareq Y. Al-Naffouri. 2022-05-22. Antenna Selection in Switch-Based MIMO Arrays via DOA threshold region Approximation. https://arxiv.org/abs/2205.10807

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