太赫兹感知协同移动通信方法及性能评估范式

Performance Evaluation of Terahertz Sensing-Assisted Mobile Communication Method

作为下一代移动通信网络的关键使能技术之一,太赫兹通信以其大带宽特性,可以满足虚拟现实、车联网、无人机通信、星间通信等多种场景的大容量传输需求。然而,移动场景下的太赫兹通信需要高精感知信息用于波束对准,现有感知协同通信方法在太赫兹系统中面临波束追不上、反射回波弱、性能评估难的技术难题,使得太赫兹通信感知一体化的系统设计悬而未决。针对上述问题,提出太赫兹感知协同移动通信方法与性能评估范式。首先利用回波信号中的相位与幅度信息分别对目标用户的方位角与切向角速度进行参数估计,之后基于克拉美罗界对感知回波和通信回波的参数信息进行融合得到目标用户角域参数信息,然后校正波束角以实现太赫兹移动通信实时波束对准。为了更好地评估所提方案性能,面向资源共享体制提出了等效对准方差与等效信道容量新指标。蒙特卡洛仿真与数值结论表明,所提方案在高用户机动、低感知资源下可以显著提升太赫兹通信感知一体化系统的感知精度与通信速率,且仍具有进一步提升性能的潜力。

As a key enabling technology for the next generation of mobile communication networks,terahertz communication,with its large bandwidth characteristics,can meet the high-capacity transmission requirements of various scenarios such as virtual reality,vehicular networks,UAV communications,and inter-satellite communications.However,terahertz communication in mobile scenarios requires high-precision sensing information for beam alignment.Existing sensing-assisted communication methods face challenges in terahertz systems,such as beam tracking lag,weak reflection echoes,and difficult performance evaluation,leaving the system design of integrated terahertz sensing and communication unresolved.To address these issues,a terahertz sensing-assisted mobile communication method and performance evaluation paradigm are proposed.Initially,the azimuth angle and tangential angular velocity of the target user are estimated using the phase and amplitude information in the echo signal.Subsequently,the parameter information of the sensing echo and communication echo is integrated based on the Cramér-Rao bound to obtain the angular domain parameter information of the target user,followed by beam angle correction to achieve real-time beam alignment in terahertz mobile communication.To better evaluate the performance of the proposed scheme,new metrics for equivalent alignment variance and equivalent channel capacity are introduced for the resource-sharing regime.Monte Carlo simulations and numerical results demonstrate that the proposed scheme can significantly enhance the sensing accuracy and communication rate of the integrated terahertz sensing and communication system in scenarios with high user mobility and low sensing resources,with potential for further performance improvement.