Low-Complexity Hybrid Precoding With Dynamic Beam Assignment in mmWave OFDM Systems
Low-Complexity Hybrid Precoding With Dynamic Beam Assignment in mmWave OFDM Systems
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DOI：
10.1109/tvt.2017.2786303
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发表时间：
2018-04
影响因子：
6.8
通讯作者：
Yazhou Zhu;Qingchuan Zhang;Tao Yang
中科院分区：
文献类型：
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作者：
Yazhou Zhu;Qingchuan Zhang;Tao Yang
提出了毫米波正交频分复用系统中动态波束分配的两阶段多用户混合迫零（ZF）预编码方案。在第一阶段中，分层波束搜索被开发以降低射频（RF）域中的复杂度，其中可变波束宽度扇区码字通过波束加宽来生成，并且主导扇区方向基于有效功率度量来选择。在第二阶段，ZF预编码与动态波束分配被用于在数字域中，其中两个低复杂度的动态波束分配策略的基础上的有效信道的RF波束成形后，提出了高系统吞吐量。仿真结果验证了我们的建议的有效性。
We propose the two-stage multiuser hybrid zero-forcing (ZF) precoding schemes with dynamic beam assignment for mmWave orthogonal frequency division multiplexing systems. In the first stage, hierarchical beam search is developed to reduce complexity in radio-frequency (RF) domain, where variable beamwidth sector codeword is generated by beam broadening, and dominant sector directions are selected based on effective power metric. In the second stage, ZF precoding with dynamic beam assignment is employed in the digital domain, where two low-complexity dynamic beam assignment strategies based on effective channel after RF beamforming are proposed for high system throughput. Simulation results validate the effectiveness of our proposals.