Hybrid Precoding for mmWave Massive MIMO Systems With Partially Connected Structure
Hybrid Precoding for mmWave Massive MIMO Systems With Partially Connected Structure
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DOI：
10.1109/access.2017.2720163
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发表时间：
2017-06
期刊：
影响因子：
3.9
通讯作者：
Nanxi Li;Zaixue Wei;Hongwen Yang;Xin Zhang;Dacheng Yang
中科院分区：
文献类型：
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作者：
Nanxi Li;Zaixue Wei;Hongwen Yang;Xin Zhang;Dacheng Yang
混合预编码由于低成本和低功耗而在毫米波（mmWave）大规模MIMO系统中被广泛研究。一般来说，有两种混合预编码结构：一种是全连接结构（FCS），其中每条射频（RF）链连接到所有天线，另一种是部分连接结构（PCS），其中每条RF链连接到子阵列。在本文中，我们研究的最佳混合预编码器的设计问题的毫米波大规模MIMO系统的基础上PCS，因为这种结构是更实际的天线部署。本文首先研究了模拟预编码器的优化问题，分别针对高信噪比和低信噪比的情况提出了两种模拟预编码器的设计方案。对于每一种方案，原始的优化问题被转化为单流最优发射波束形成问题，每个天线的功率约束，它有一个最优解。然后，在确定预编码器的接入点后，通过注水算法得到最优的数字预编码器。此外，所提出的计划与封闭形式的表达，可达到的数据速率的上界。
Hybrid precoding is widely studied in millimetre-wave (mmWave) massive MIMO systems due to low cost as well as low power consumption. In general, there are two kinds of hybrid precoding structures: one is fully connected structure (FCS), where each radio frequency (RF) chain is connected to all antennas, and the other is partially connected structure (PCS), where each RF chain is connected to a sub-array. In this paper, we investigate the optimal hybrid precoder design problem for mmWave massive MIMO systems based on PCS, since this kind of structure is more practical for antenna deployment. We first focus on the optimization of analog precoder (AP) and propose two AP design schemes for high signal-to-noise ratio (SNR) condition and low SNR condition, respectively. For each of the schemes, the original optimization problem is reformulated to single-stream optimal transmitter beamforming problem with per-antenna power constraint, which has an optimal solution. Then, the optimal digital precoder is obtained by water-filling algorithm after AP is determined. Moreover, upper bounds of the achievable data rate for the proposed schemes with closed-form expression are derived.