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On Design of Non-Orthogonal Pilot Signals for a Multi-Cell Massive MIMO System

机译:多小区大规模MIMO系统的非正交导频信号设计

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摘要

In this letter, the error variance of the Minimal Mean-Square Error (MMSE) channel estimator is analyzed, and its analytic formula is given. Based on the analytic formula, a designing criterion on the pilot signals is proposed. When training time slots can be large enough, our criterion confirms the well-known fact that orthogonal pilot signals are optimal. But if training time slots are not enough to support this orthogonality, our results show that the error variance is lower-bounded away from zero, no matter what kind of pilot signals are used. In this case, the design of pilot signals should be implemented by using the line packing on a complex Grassmannian manifold.
机译:本文分析了最小均方误差(MMSE)信道估计器的误差方差,并给出了其解析公式。基于解析公式,提出了导频信号的设计准则。当训练时隙可以足够大时,我们的标准证实了正交导频信号是最佳的众所周知的事实。但是,如果训练时隙不足以支持此正交性,则我们的结果表明,无论使用哪种导频信号,误差方差都接近零。在这种情况下,应通过在复杂的格拉斯曼流形上使用线路填充来实现导频信号的设计。

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