面向超大规模阵列的近场通信研究

Near-field communications for extremely large-scale array

超大规模阵列可以有效提升传输距离,克服路径损耗,为通信发展带来新的机遇。在超大规模天线阵列系统中,用户和散射体更可能位于近场辐射区域,通信系统应采用更精确的球面波模型。然而,目前针对超大规模阵列近场通信的研究尚处于初始阶段,面临着码本搜索开销大、波束追踪复杂度高等问题。基于现有研究基础,分析了近场通信中的关键问题,包括波束训练、波束追踪以及天线可视区域,指出所面临的挑战,并提出了未来愿景。

Extremely large-scale array has brought new opportunities for communication by effectively increasing the transmission distance and overcoming the path loss.In the extremely large-scale array system,the user and the scatterer are likely to be located in the near-field radiation region.Therefore,the communication system should adopt an accurate spherical wave model.However,research on near-field communication for extremely large-scale array is still in its initial stage and faces some challenges such as the high cost of codebook search and high complexity of beam tracking.This paper analyzes the key problems in near-field communication for extremely large-scale array,including beam training,beam tracking and visibility regions of antenna based on existing research.Then,it presents the challenges and proposes the future vision.