宽带太赫兹大规模MIMO系统中的混合预编码

针对宽带太赫兹大规模多输入多输出(multiple input multiple output, MIMO)通信系统中更大的带宽和更多的天线导致的波束分裂问题，构建了基于时延的宽带太赫兹大规模MIMO系统的混合预编码通信模型，并提出了一种高效且可实现的联合时延和相位的宽带太赫兹混合预编码算法。考虑到时延器值的硬件限制，通过最小化最优模拟预编码与等效模拟预编码之间的差来联合优化模拟预编码矩阵和数字预编码矩阵，将联合优化问题转换成目标优化问题，通过将非凸问题转换成等价的凸问题来求全局最优解。仿真结果表明，提出的算法可以获得接近最优的可实现速率性能，且可以提高能量效率。

Hybrid precoding in wideband terahertz large-scale MIMO systems

To solve the problem of beam splitting caused by increased bandwidth and antenna number in broadband terahertz large-scale multiple input multiple output (MIMO) communication system, this paper constructs a novel hybrid precoding communication model integrating time delay. This model addresses the hardware constraints related to time delay values and introduces an efficient joint optimization algorithm for broadband terahertz hybrid precoding, considering both analog and digital precoding matrices. The optimization process involves minimizing the difference between optimal and equivalent analog precoding matrices, converting the joint optimization problem into a target optimization task. This transformation enables the resolution of the global optimal solution by converting the non-convex problem into an equivalent convex one. Simulation results demonstrate that the proposed algorithm achieves near-optimal achievable rate performance and enhances energy efficiency in broadband terahertz MIMO systems.