论文标题
双光束智能反射表面的毫米和THZ通信
Dual-Beam Intelligent Reflecting Surface for Millimeter and THz Communications
论文作者
论文摘要
智能反射表面（IRS）是提高功率效率和光谱效率的一种经济高效的技术。然而，IRS辅助的多ANTENNA传输需要共同优化被动和主动的光束形成，由于其迭代优化过程，施加了高计算负担和高潜伏期。本文提出了在高频传输系统中利用杂交模拟数字光束的形成，这是一种新型技术，即创建的双光束IRS。关键的想法是分别向IRS和用户形成一对光束。然后，可以将被动和主动波束形成的优化脱钩，从而简化系统设计。模拟结果证实了它在细胞边缘和中心性能之间取得了良好的平衡。与性能结合相比，差距是中等的，但它的表现明显优于其他亚最佳方案。
Intelligent reflecting surface (IRS) is a cost-efficient technique to improve power efficiency and spectral efficiency. However, IRS-aided multi-antenna transmission needs to jointly optimize the passive and active beamforming, imposing a high computational burden and high latency due to its iterative optimization process. Making use of hybrid analog-digital beamforming in high-frequency transmission systems, a novel technique, coined dual-beam IRS, is proposed in this paper. The key idea is to form a pair of beams towards the IRS and user, respectively. Then, the optimization of passive and active beamforming can be decoupled, resulting in a simplified system design. Simulation results corroborate that it achieves a good balance between the cell-edge and cell-center performance. Compared with the performance bound, the gap is moderate, but it remarkably outperforms other sub-optimal schemes.
