基于DoA的高速场景下大规模MIMO自适应波束成形

doi:10.11959/j.issn.1000-436x.2017086

Abstract

Abstract:

A direction of arrival based (DoA-based) beamforming of massive MIMO was proposed for high-speed railway scenarios.In order to guarantee that the optimal system capacity can be obtained during traveling,an iterative multi-beams scheme was proposed.It aimed to design different beams for different mobile carriage terminals (MCT) respectively.The proposal adaptively selected the number of antennas for each beam,and adaptively designed the number of beams according to system capacity.Moreover,the scheme didn’t need channel state information (CSI) that can reduce system implementation complexity and cost.Numerical results indicate that the proposed scheme is suitable for high-speed scenarios,the system performance can be improved more efficiently compared to conventional methods.

Key words: high-speed railway, massive MIMO, train-ground communication, direction of arrival, beamforming

CLC Number:

TN929.5

Yong LIAO,Yu-feng LI,Xuan-fan SHEN. Adaptive beamforming of massive MIMO based on DoA in high mobility scenarios[J]. Journal on Communications, 2017, 38(6): 58-67.

Figures/Tables 12

References 33

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列车离BS在轨道垂直投影点的距离d/m	角度	不同速度时方位角平均变化率/°
列车离BS在轨道垂直投影点的距离d/m	角度	v=90 km/h	v=180 km/h	v=270 km/h	v=360 km/h	v=450 km/h
	θ_r	54.90	109.10	164.60	219.40	274.30
1～500	φ_r	26.90	53.80	80.80	107.70	134.60
	θ_r	0.46	0.93	1.39	1.85	2.32
500～2 400	φ_r	0.46	0.92	1.38	1.84	2.31

参数	值
载波频率/GHz	2.35
带宽/MHz	20
列车速度v/(km·h^?1)	360
BS发射功率阈值/dBm	46
BS天线数N_T	512
MCT天线数N_R	16
归一化的阵元间距Δ	0.5
列车车厢数	8
车厢长度/m	25
MCT间距l/m	30
收发天线高度差h_BS/m	40
BS与铁轨最短距离D_min/m	50
BS信号覆盖半径/km	3
环境信噪比/dB	25
噪声功率谱密度/(dBm·Hz^?1)	?174

Adaptive beamforming of massive MIMO based on DoA in high mobility scenarios

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