In this correspondence, we study deploying movable antenna (MA) array in a wideband multiple-input-single-output (MISO) communication system, where near-field (NF) channel model is considered. To alleviate beam squint effect, we propose to maximize the minimum analog beamforming gain across the entire wideband spectrum by appropriately adjusting MAs' positions, which is a highly challenging task. By introducing a slack variable and adopting the cutting-the-edge smoothed-gradient-descent-ascent (SGDA) method, we develop algorithms to resolve the aforementioned challenge. Numerical results verify the effectiveness of our proposed algorithms and demonstrate the benefit of utilizing MA array to mitigate beam squint effect in NF wideband system.

翻译：本文研究在宽带多输入单输出（MISO）通信系统中部署可移动天线（MA）阵列，其中考虑了近场（NF）信道模型。为缓解波束斜视效应，我们提出通过适当调整MA的位置，最大化整个宽带频谱上的最小模拟波束成形增益，这是一项极具挑战性的任务。通过引入松弛变量并采用边缘切割平滑梯度下降上升（SGDA）方法，我们开发了算法来解决上述难题。数值结果验证了所提算法的有效性，并证明了利用MA阵列在NF宽带系统中抑制波束斜视效应的优势。