Two-Stage Channel Estimation Approach for Cell-Free IoT With Massive Random Access

  title={Two-Stage Channel Estimation Approach for Cell-Free IoT With Massive Random Access},
  author={Xinhua Wang and Alexei E. Ashikhmin and Zhicheng Dong and Chao Zhai},
  journal={IEEE Journal on Selected Areas in Communications},
We investigate the activity detection and channel estimation issues for cell-free Internet of Things (IoT) networks with massive random access. In each time slot, only partial devices are active and communicate with neighboring access points (APs) using non-orthogonal random pilot sequences. Different from the centralized processing in cellular networks, the activity detection and channel estimation in cell-free IoT is more challenging due to the distributed and user-centric architecture. We… 
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