Antenna Subarray Partitioning with Interference Cancellation for Multi-User Indoor Terahertz Communications

In this paper, we study a multi-user indoor Terahertz (THz) communication system with multiple antenna subarrays. By exploiting the characteristics of the THz channel and the capabilities of large antennas, we design a hybrid beamforming scheme to compensate the severe path loss while keep the system in low complexity. In particular, with the analog beamsteering searching in radio frequency (RF) domain, antenna subarrays are partitioned on a user basis, where data streams are transmitted and steered via a group of subarrays to a specific user. Then, the zero- forcing digital beamformer is implemented at baseband for interference cancellation among different users. Simulation results are provided to verify the effectiveness of the proposed hybrid beamforming scheme for the multi-user THz system, which shows great advantages over the schemes with random subarray assignment and analog-only beamsteering.