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arXiv 1702.02121cs.ITmath.IT
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高速训练通信大规模MIMO波束形成:方向性与波束宽度

Massive MIMO Beam-forming for High Speed Train Communication: Directivity vs Beamwidth

Xuhong Chen, Jiaxun Lu, Pingyi Fan

摘要:

高移动性自适应和大规模多输入多输出(MIMO)应用是下一代高速训练通信系统的两个主要发展目标。针对大规模MIMO系统中的位置感知波束形成问题,首先分析了波束方向性和波束宽度之间的折衷关系,并在此基础上给出了定位精度的灵敏度分析。在不同定位精度的约束下,推导出了保证高效传输的最大波束指向性和相应的波束宽度。最后,我们提出了一种利用位置信息具有定位鲁棒性的低复杂度波束成形设计,该设计既不需要对上行链路信道协方差矩阵(CCM)进行特征分解(ED),也不需要对下行链路CCM(DCCM)进行ED。数值仿真表明,在高移动性的场景下,定位误差小于一定值的大规模MIMO系统能够保证所需的性能和传输效率。

英文摘要:

High-mobility adaption and massive Multiple-input Multiple-output (MIMO) application are two primary evolving objectives for the next generation high speed train communication system. In this paper, we consider how to design a location-aware beam-forming for the massive MIMO system.We first analyze the tradeoff between beam directivity and beamwidth, based on which we present the sensitivity analysis of positioning accuracy. Then, we derive the maximum beam directivity and corresponding beamwidth under the restriction of diverse positioning accuracies to guarantee a high efficient transmission. Finally, we present a low-complexity beam-forming design with positioning robustness utilizing location information, which requires neither eigen-decomposing (ED) the uplink channel covariance matrix (CCM) nor ED the downlink CCM (DCCM). Numerical simulation indicates that a massive MIMO system with less than a certain positioning error can guarantee a required performance with satisfying transmission efficiency in the high-mobility scenario.

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