Beam space based channel estimation method in millimeter wave multi-cell and multi-antenna system

毫米波多小区多天线系统中基于波束空间的信道估计方法

Abstract

The invention discloses a beam space based channel estimation method in a millimeter wave multi-cell and multi-antenna system. On the one hand, directions of arrival of all terminals are estimated by using a beam space in the millimeter wave multi-cell and multi-antenna system. On the other hand, the path loss is estimated by using the directions of arrival and received pilot symbols. A fundamental principle of the beam space is that a group of orthogonal bases of a vector space is formed by using array response vectors corresponding to a specified direction of arrival according to the orthogonality among the array response vectors. Correlation calculation is carried out on the group of orthogonal bases and received signals, and the directions of arrival of all terminals are estimated according to a correlation value. The dimensionality of the received signals is significantly reduced by using a selected orthogonal basis, and thus the directions of arrival of the terminals are estimated only according to the signals with the dimensionality being reduced, and estimation for the directions of arrival acts as fine estimation. The beam space based channel estimation method reduces the calculation complexity of estimation for the directions of arrival, and effectively avoids interference.
本发明公开了一种用于毫米波多小区多天线系统中基于波束空间的信道估计方法。本发明一方面利用毫米波多小区多天线系统中的波束空间来估计所有终端的波达角。另一方面利用波达角估计和接收到的导频符号估计路径损耗。波束空间的基本原理是根据特定的波达角对应的阵列响应向量之间的正交性,利用这些向量组成向量空间的一组正交基。利用这组正交基与接收的信号做相关计算,根据相关值估算所有终端的波达角。利用选出的正交基把接收信号的维度大幅度降低,从而只需要根据降低维度的信号估计终端的波达角,把这些波达角估计作为精细估计。本发明降低了波达角估计的计算复杂度,有效避免了干扰。

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