The performance of millimeter wave (mmWave) communications strongly relies on accurate beamforming both at base station and user terminal sides, referred to as beam alignment (BA). Existing BA algorithms provide initial yet coarse angle estimates as they typically use a codebook of a finite number of discreteized beams (angles). Towards emerging applications requiring timely and precise tracking of dynamically changing state of users, we consider a system where a base station with a co-located radar receiver estimates relevant state parameters of users and simultaneously sends OFDM-modulated data symbols. In particular, based on a hybrid digital analog data transmitter/radar receiver architecture, we propose a simple beam refinement and initial state acquisition scheme that can be used for beam and user location tracking in a dynamic environment. Numerical results inspired by IEEE802.11ad parameters demonstrate that the proposed method is able to improve significantly the communication rate and further achieve accurate state estimation.
翻译:毫米波(mmWave)通信的性能在很大程度上取决于基站和用户终端两侧的准确波束形状,称为波束对齐(BA)。现有的BA算法提供了初步但粗略的角度估计,因为它们通常使用数量有限的离散波束(矩形)的编码簿。在需要及时和准确地跟踪动态变化中的用户状态的新兴应用中,我们认为一个系统,由共用雷达接收器的基地台对用户的相关状态参数进行估算,同时发送调控数据符号。特别是,根据一个混合数字模拟数据发射机/雷达接收器结构,我们提议一个简单的波束改进和初步的状态获取计划,用于在动态环境中跟踪波束和用户位置。由IEEE802.11ad参数启发的数值结果显示,拟议方法能够显著提高通信率,并进一步实现准确的状态估算。