A Switching-Less True-Time-Delay-Based Beam Probing Approach for Ultra-Low Latency Wireless Communications: System Analysis and Demonstration
IEEE Transactions on Circuits and Systems II: Express Briefs(2022)
摘要
Emerging wireless communication systems at millimeter-wave (mmW) require wideband phased-arrays transceivers not only for high data-rate communications but also for fast direction finding using beam training algorithms. In real world, scanning both azimuth and elevation is also important for accurate localization over three-dimensional (3D) space. This brief presents the system analysis and demonstration of frequency dispersive 3D beam training algorithm using a
$2 \times 2$
planar array integrated in a single chip suited for low-latency mmW wireless communications. System-level issues with high search latency in earlier time-division based beam training algorithms and the need for multiple ICs for 3D beam training are addressed with a large delay range true-time-delay (TTD) based spatial signal processor (SSP) together with the frequency-dependent rainbow beam training algorithm. Trade-offs between angular coverage efficiency over the 3D space and required hardware delay range are analyzed. Measured results on the
$2 \times 2$
antenna array demonstrate the efficacy of the 3D beam training algorithm achieving 50% spherical coverage efficiency realized with the 3.75ns IC delay range over 800MHz bandwidth.
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关键词
Planar arrays,true-time-delay arrays,3D beam training,spherical coverage efficiency,time-interleaving
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