arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1802.10461eess.SPcs.PF
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大规模多输入多输出系统中基于时空BEM的时变信道跟踪

Time Varying Channel Tracking with Spatial and Temporal BEM for Massive MIMO Systems

Jianwei Zhao, Hongxiang Xie, Feifei Gao, Weimin Jia, Shi Jin, Hai Lin

摘要:

本文提出了一种适用于大规模多输入多输出系统的时变和空变信道跟踪方法。利用大规模天线阵列的特点,设计了一种时空基扩展模型,将信道状态信息分解为时变的空间信息和增益信息,降低了上下行信道的有效维数。我们首先将用户的移动建模为一阶未知马尔可夫过程,通过期望和最大化(EM)方法进行盲学习。然后,通过对导向矢量进行泰勒级数展开,实现了对上行时变空间信息的盲跟踪,而其余的上行信道增益信息仅需少量导频符号即可训练完成。由于角度互易性(空间互易性),可以立即从上行链路对应方获得下行链路信道的空间信息,这大大降低了下行链路信道跟踪的复杂度。各种数值结果证明了所提出的方法的有效性。

英文摘要:

In this paper, we propose a channel tracking method for massive multi-input and multi-output systems under both time-varying and spatial-varying circumstance. Exploiting the characteristics of massive antenna array, a spatial-temporal basis expansion model is designed to reduce the effective dimensions of up-link and down-link channel, which decomposes channel state information into the time-varying spatial information and gain information. We firstly model the users movements as a one-order unknown Markov process, which is blindly learned by the expectation and maximization (EM) approach. Then, the up-link time varying spatial information can be blindly tracked by Taylor series expansion of the steering vector, while the rest up-link channel gain information can be trained by only a few pilot symbols. Due to angle reciprocity (spatial reciprocity), the spatial information of the down-link channel can be immediately obtained from the up-link counterpart, which greatly reduces the complexity of down-link channel tracking. Various numerical results are provided to demonstrate the effectiveness of the proposed method.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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