Angle Estimation for Terahertz Ultra-Massive MIMO-Based Space-to-Air Communications
Anwen Liao,Zhen Gao,Yang Yang,Ha H. Nguyen,Hua Wang,Hao Yin +5 more
- pp 776-781
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TLDR
In this article, a grouping true-time delay unit module was designed to mitigate the impact of delay-beam squint effects to establish the space-to-air THz link.Abstract:
This paper investigates terahertz ultra-massive (UM)-MIMO-based angle estimation for space-to-air communications, which can solve the performance degradation problem caused by the dual delay-beam squint effects of terahertz UM-MIMO channels. Specifically, we first design a grouping true-time delay unit module that can significantly mitigate the impact of delay-beam squint effects to establish the space-to-air THz link. Based on the subarray selection scheme, the UM hybrid array can be equivalently considered as a low-dimensional fully-digital array, and then the fine estimates of azimuth/elevation angles at both UAVs and satellite can be separately acquired using the proposed prior-aided iterative angle estimation algorithm. The simulation results that close to Cramer-Rao lower bounds verify the effectiveness of our solution.read more
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