Abstract
在毫米波大规模多输入多输出(MIMO)系统中，为了减小全数字预编码时硬件安装复杂度及安装费用，以及克服毫米波传输衰减大的问题，本文探讨一种线性混合预编码方法。首先分析了一个可渐近最优的线性模拟预编码方案，该方案可通过迭代处理就能实现。在此迭代模拟预编码基础上，本文进而在数字预编码方面考虑块对角化(BD)和最大比传输(MRT)两种线性方案，并在不同的参数下对MRT与BD进行仿真对比。仿真结果表明，在低信噪比和用户数少时，MRT性能优于BD，而在其它情况下，BD性能优于MRT。 In millimeter wave massive multiple-input multiple-output (MIMO) systems, in order to reduce installed hardware complexity and cost in full digital precoding, and to overcome the problem of large transmission loss in millimeter wave, this paper investigates a kind of hybrid precoding schemes with low complexity. This paper firstly analyzes a linear analog precoding scheme with asymptotically optimal performance, which can be implemented through iterative processing. Based on the iterative analog precoding scheme, this paper considers further the two linear digital precoding schemes with block diagonalization (BD) and maximum ratio transmission (MRT), respectively, and makes numerical comparison between the BD and the MRT for different kinds of parameters. The simulation results show that under the case with low SNR and a few users, the MRT has better performance than BD, and the BD has better performance than the MRT in the other cases.
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