In this letter, we investigated the achievable spectral efficiency and complexity of a single-user millimeter wave massive multiple-input-multiple-output system with hybrid analog/digital transceiver architecture. We then proposed a new low-complexity alternating minimization algorithm based on the Barzilai-Borwein gradient algorithm to maximize the spectral efficiency. Accordingly, in order to minimize the Euclidean distance between hybrid precoders and the optimal precoder (fully digital precoder), optimization of analog and digital precoders (or decoders) are presented. Simulation results show that in spite of its lower computational complexity the proposed method can achieve almost the same spectral efficiency as the competing methods.

中文翻译：

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基于 Barzilai-Borwein 梯度算法的单用户毫米波系统交替最小化

在这封信中，我们研究了具有混合模拟/数字收发器架构的单用户毫米波大规模多输入多输出系统的可实现频谱效率和复杂性。然后，我们基于 Barzilai-Borwein 梯度算法提出了一种新的低复杂度交替最小化算法，以最大化频谱效率。因此，为了最小化混合预编码器和最佳预编码器（全数字预编码器）之间的欧几里德距离，提出了模拟和数字预编码器（或解码器）的优化。仿真结果表明，尽管其计算复杂度较低，但所提出的方法可以实现与竞争方法几乎相同的频谱效率。