基于IRS辅助的MIMO车联网系统联合波束成形设计

doi:10.11959/j.issn.1000-436x.2023035

Abstract

Abstract:

A joint beamforming design method assisted by an IRS was proposed in MIMO Internet of vehicles system where the spectrum was shared by V2I and V2V users.Considering the constraints of V2V user’s data rate requirement, transmit power and IRS reflection phase shift, transmit precoding matrix at base station and reflective phase shift matrix of the IRS were jointly optimized to maximize channel capacity of the V2I user.The coupled non-convex optimization problem was decoupled and converted to be convex by using minimum mean square error, matrix analysis and inner approaching algorithm.An alternate iterative optimization algorithm was proposed to find the feasible solution.The performance comparisons of the proposed algorithm with several benchmarks were carried out and the impacts of the number of IRS reflective elements, IRS location and vehicle speed on spectrum efficiency were provided, respectively.The simulation results show that the proposed algorithm can converge quickly and the spectrum efficiency can be maximally improved by using the proposed method if the IRS is deployed near the base station.

Key words: intelligent reflecting surface, Internet of vehicles, MIMO, beam forming, convex optimization

CLC Number:

TN92

Lei ZHANG, Yu WANG, Jianjie TIAN, Lin ZHANG, Tianjiao ZHANG. Joint beam forming design for IRS-aided MIMO Internet of vehicles system[J]. Journal on Communications, 2023, 44(2): 59-69.

Figures/Tables 7

参数名称	取值
基站发射功率P/W	1
V2V用户数据速率需求γ^req/(bit·(s·Hz)^-1)	1
发送数据流个数d_C , d _D	2
发送端天线数M_t, L _t	4
接收端天线数M_r, L _r	2
IRS反射单元数N	20
反射单元间隔与电磁波长比值 $\frac{d}{λ}$	0.5
与IRS有关的路径损耗指数	2
基站到C-VUE和D-VUE路径损耗指数	3.75
D-VUE之间的路径损耗指数	3
与IRS有关的莱斯衰落因子	3
每米的路径损耗/dB	30
噪声功率谱密度/(dBm·Hz^-1)	-174
算法误差精度	0.001

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Joint beam forming design for IRS-aided MIMO Internet of vehicles system

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References ［38］

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