Journal
IEEE TRANSACTIONS ON COMMUNICATIONS
Volume 63, Issue 8, Pages 2985-2995Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCOMM.2015.2440356
Keywords
Terahertz; distance-aware multi-carrier transmission; user grouping; hybrid beamforming; power allocation; antenna array selection; greedy algorithm
Funding
- U.S. National Science Foundation [CCF-1349828]
- Division of Computing and Communication Foundations
- Direct For Computer & Info Scie & Enginr [1349828] Funding Source: National Science Foundation
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Terahertz (THz) communication is envisioned as a key technology for next-generation ultra-high-speed wireless systems. In this paper, we study an indoor multi-user THz communication system with multiple antenna subarrays. To capture the distance-frequency-dependent characteristics of THz channels, we design a hybrid beamforming scheme with distance-aware multi-carrier transmission, including analog beamforming for user grouping and interference cancellation in radio-frequency (RF) domain and digital beamforming with dynamically selected subarrays at baseband. Specifically, an adaptive power allocation and low-complexity antenna subarray selection policy is developed to serve different users at different distances and reduce the cost of active RF circuits simultaneously, where two greedy subarray selection algorithms are proposed. The effectiveness of the proposed adaptive hybrid beamforming and antenna subarray selection algorithms is verified through simulation results, which achieves significant gains over other nonadaptive and non-distance-aware schemes.
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