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Improved User-Specific Channel Estimation Using Geodesical Interpolation at the Transmitter

机译:在发射机处使用大地插值改进了用户特定的信道估计

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In this letter we study a precoding matrix (PM) interpolation in the context of user-specific channel estimation. We interpolate the fed-back PMs at the transmitter by the means of geodesic to enable continuous channel estimation across continuously scheduled frequency clusters in the receiver. The proposed scheme is compared to the case where a single PM is used for all sub-carriers within a frequency cluster and channel estimation can be performed only within that cluster. We compare the performance of geodesical interpolation on Grassmann, Stiefel, and Flag manifolds. For this purpose, we provide an iterative framework to obtain geodesics on Stiefel and Flag manifolds based on boundary conditions. We show by monte-carlo simulations that the interpolation of fed-back PMs at the transmitter improves significantly the quality of channel estimation.
机译:在这封信中,我们将在用户特定信道估计的背景下研究预编码矩阵(PM)插值。我们通过测地线在发射机处对反馈的PM进行插值,以实现跨接收机中连续调度的频率簇的连续信道估计。将提出的方案与单个PM用于频率群集内的所有子载波的情况进行比较,并且只能在该群集内执行信道估计。我们比较了Grassmann,Stiefel和Flag流形上测地线插值的性能。为此,我们提供了一个迭代框架,可以根据边界条件在Stiefel和Flag流形上获得测地线。我们通过蒙特卡洛仿真表明,在发射机处的反馈PM的插值显着提高了信道估计的质量。

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