太赫兹（THz）通信中基于事件的动态波束宽度自适应波束跟踪
Event-Based Beam Tracking with Dynamic Beamwidth Adaptation in Terahertz (THz) Communications
AI总结：
针对THz窄波束移动、对齐与阻塞难题，提出动态波束宽度自适应参数化波束成形及基于事件的低开销波束跟踪与信道估计方法，联合优化速率和中断概率。
摘要：
太赫兹（THz）通信将成为下一代无线系统的关键使能技术。尽管THz频段提供丰富带宽和极高数据速率，但其有效运行受到通信距离短和波束窄的制约，从而在用户移动性、波束对齐和切换方面带来重大挑战。特别是，迫切需要新型波束跟踪方法，以权衡通过提高波束方向性来增强接收信号强度，与通过加宽波束来提高覆盖概率之间的关系。本文构建了一个多目标优化问题，目标是在发射功率和开销约束下，联合最大化期望速率并最小化中断概率。随后，提出了一种具有动态波束宽度自适应能力的新型参数化波束成形器。除预编码器外，还引入了一种基于事件的波束跟踪方法，可在保持低导频开销的同时，有效防止由波束失准和动态阻塞导致的中断。仿真结果表明，所提波束成形方案提升了平均速率性能，并减少了THz脆弱失准过程以及THz频段尤为严重的路径损耗所造成的中断。此外，所提事件触发THz信道估计方法能够以最小开销实现连接，并在THz频段进行可靠通信。
英文摘要：
Terahertz (THz) communication will be a key enabler for next-generation wireless systems. While THz frequency bands provide abundant bandwidth and extremely high data rates, their effective operation is inhibited by short communication ranges and narrow beams, thus, leading to major challenges pertaining to user mobility, beam alignment, and handover. In particular, there is a strong need for novel beam tracking methods that consider the tradeoff between enhancing the received signal strength via increasing beam directivity, and increasing the coverage probability by widening the beam. In this paper, a multi-objective optimization problem is formulated with the goal of jointly maximizing the expected rate and minimizing the outage probability subject to transmit power and overhead constraints. Subsequently, a novel parameterized beamformer with dynamic beamwidth adaptation is proposed. In addition to the precoder, an event-based beam tracking approach is introduced that efficiently prevents outages caused by beam misalignment and dynamic blockage while maintaining a low pilot overhead. Simulation results show that the proposed beamforming scheme improves average rate performance and reduces the amount of outages caused by the brittle THz misalignment process and the particularly severe path loss in the THz band. Moreover, the proposed event-triggered THz channel estimation approach enables connectivity with minimal overhead and reliable communication at THz bands.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
