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Beamforming for Sensing: Hybrid Beamforming based on Transmitter-Receiver Collaboration for Millimeter-Wave Sensing

Published: 15 May 2024 Publication History

Abstract

Previous mmWave sensing solutions assumed good signal quality. Ensuring an unblocked or strengthened LoS path is challenging. Therefore, finding an NLoS path is crucial to enhancing perceived signal quality. This paper proposes Trebsen, a Transmitter-REceiver collaboration-based Beamforming scheme SENsing using commercial mmWave radars. Specifically, we define the hybrid beamforming problem as an optimization challenge involving beamforming angle search based on transmitter-receiver collaboration. We derive a comprehensive expression for parameter optimization by modeling the signal attenuation variations resulting from the propagation path. To comprehensively assess the perception signal quality, we design a novel metric perceived signal-to-interference-plus-noise ratio (PSINR), combining the carrier signal and baseband signal to quantify the fine-grained sensing motion signal quality. Considering the high time cost of traversing or randomly searching methods, we employ a search method based on deep reinforcement learning to quickly explore optimal beamforming angles at both transmitter and receiver. We implement Trebsen and evaluate its performance in a fine-grained sensing application (i.e., heartbeat). Experimental results show that Trebsen significantly enhances heartbeat sensing performance in blocked or misaligned LoS scenes. Comparing non-beamforming, Trebsen demonstrates a reduction of 23.6% in HR error and 27.47% in IBI error. Moreover, comparing random search, Trebsen exhibits a 90% increase in search speed.

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  • (2024)3D Bounding Box Estimation Based on COTS mmWave Radar via Moving ScanningProceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies10.1145/36997588:4(1-27)Online publication date: 21-Nov-2024
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  1. Beamforming for Sensing: Hybrid Beamforming based on Transmitter-Receiver Collaboration for Millimeter-Wave Sensing

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      cover image Proceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies
      Proceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies  Volume 8, Issue 2
      June 2024
      1330 pages
      EISSN:2474-9567
      DOI:10.1145/3665317
      Issue’s Table of Contents
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      Published: 15 May 2024
      Published in IMWUT Volume 8, Issue 2

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      Author Tags

      1. Fine-grained Motion Sensing
      2. Hybrid Beamforming
      3. mmWave Radar

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      • (2024)3D Bounding Box Estimation Based on COTS mmWave Radar via Moving ScanningProceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies10.1145/36997588:4(1-27)Online publication date: 21-Nov-2024
      • (2024)Facial Landmark Detection Based on High Precision Spatial Sampling via Millimeter-wave RadarProceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies10.1145/36997398:4(1-26)Online publication date: 21-Nov-2024

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