# Joint User Activity Identification and Channel Estimation for Grant-Free NOMA: A Spatial–Temporal Structure-Enhanced Approach

> Research article (IEEE Internet of Things Journal, 2021) · cited 20× · AI/ML

**Wikidata**: [openalex:W3133612327](https://www.wikidata.org/wiki/openalex:W3133612327)  
**Source**: https://4ort.xyz/entity/joint-user-activity-identification-and-channel-estimation-for-grant-free-noma-a-spatialtemporal-structure-enhanced-appro