Hybrid Block Diagonalization for Massive Multiuser MIMO Systems
Hybrid Block Diagonalization for Massive Multiuser MIMO Systems
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DOI：
10.1109/tcomm.2015.2502954
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发表时间：
2015-04
影响因子：
8.3
通讯作者：
Weiheng Ni;Xiaodai Dong
中科院分区：
文献类型：
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作者：
Weiheng Ni;Xiaodai Dong
对于大规模多输入多输出(MIMO)系统，与完全复杂的射频链配置相比，将射频链的数量限制在远远少于天线单元的数量可以显著降低实现成本。本文针对大规模多用户MIMO(MU-MIMO)系统的下行链路通信，提出了一种低复杂度的混合块对角化(Hy-BD)方案，以接近传统块对角化处理方法的容量性能。我们的目标是通过纯相位射频预编码和合并获得大的阵列增益，然后在等效的基带信道上进行数字BD处理。提出的Hy-BD方案在大瑞利衰落信道和毫米波(毫米波)信道中都得到了验证。进一步对单径信道和大量发射和接收天线进行了性能分析。最后，仿真结果表明，我们的Hy-BD方案以较低的实现和计算复杂度获得了接近(有时甚至高于)传统高维BD处理的容量性能。
For a massive multiple-input multiple-output (MIMO) system, restricting the number of RF chains to far less than the number of antenna elements can significantly reduce the implementation cost compared to the full complexity RF chain configuration. In this paper, we consider the downlink communication of a massive multiuser MIMO (MU-MIMO) system and propose a low-complexity hybrid block diagonalization (Hy-BD) scheme to approach the capacity performance of the traditional BD processing method. We aim to harvest the large array gain through the phase-only RF precoding and combining and then digital BD processing is performed on the equivalent baseband channel. The proposed Hy-BD scheme is examined in both the large Rayleigh fading channels and millimeter wave (mmWave) channels. A performance analysis is further conducted for single-path channels and large number of transmit and receive antennas. Finally, simulation results demonstrate that our Hy-BD scheme, with a lower implementation and computational complexity, achieves a capacity performance that is close to (sometimes even higher than) that of the traditional high-dimensional BD processing.