# Millidegree-Level Direction-of-Arrival Estimation and Tracking for Terahertz Ultra-Massive MIMO Systems

> Research article (IEEE Transactions on Wireless Communications, 2021) · cited 74× · AI/ML

**Wikidata**: [openalex:W3192919170](https://www.wikidata.org/wiki/openalex:W3192919170)  
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