论文标题
使用移动毫米波网络中使用轨迹信息的光束对准
Beam Alignment Using Trajectory Information in Mobile Millimeter-wave Networks
论文作者
论文摘要
毫米波和Terahertz系统依靠光束成形/组合代码簿来确定初始访问和数据传输期间的最佳光束方向。在有移动设备的情况下，现有的方法遭受了大型代码簿的尺寸和远光灯搜索开销。为了解决此问题，我们利用相邻位置中通道的相似性将用户轨迹分为一组单独的区域，并在数据库中为每个区域维护一组候选梁。由于区域数量和信号开销之间的折衷，即，越来越多的区域会导致较高的信噪比（SNR），但也导致数据库的较大信号传导开销，我们提出了一个优化框架，以根据移动设备的轨迹找到最小的区域数量。使用射线跟踪工具，我们证明了所提出的方法提供了高SNR，同时与查找表基线和固定尺寸区域基线相比，对位置信息的准确性更为强大。
Millimeter-wave and terahertz systems rely on beamforming/combining codebooks to determine the best beam directions during the initial access and data transmission. Existing approaches suffer from large codebook sizes and high beam searching overhead in the presence of mobile devices. To address this issue, we utilize the similarity of the channel in adjacent locations to divide the user trajectory into a set of separate regions and maintain a set of candidate beams for each region in a database. Due to the tradeoff between the number of regions and the signalling overhead, i.e., the greater number of regions results in a higher signal-to-noise ratio (SNR) but also a larger signalling overhead for the database, we propose an optimization framework to find the minimum number of regions based on the trajectory of a mobile device. Using a ray tracing tool, we demonstrate that the proposed method provides high SNR while being more robust to the location information accuracy in comparison to the lookup table baseline and fixed size region baseline.
