TDD模式下无小区大规模MIMO系统的导频干扰抑制

doi:10.11959/j.issn.1000-0801.2022071

Abstract

Abstract:

To alleviate the pilot interference for cell-free massive multi-input multi-output (MIMO) system and improve system’s performance, a comprehensive approach including the pilot reuse, access point (AP) selection and power allocation was proposed.Firstly, to alleviate the pilot contamination, the pilot assignment based on the order of user distance was proposed, in which the pilot sharing was only allowed when the distance between two users is large enough to reduce the impact of pilot reuse.Then, by AP selection, only the APs which have main impact on the macro diversity gain were selected as the user’s serving APs.Finally, a modified max-min power control algorithm was proposed to improve the system’s average throughput.Simulation results show that the pilot interference mitigation strategy proposed improves the performance of the system significantly.

Key words: cell-free massive MIMO, pilot reuse, pilot contamination, AP selection, power control

CLC Number:

TN929.5

Yue WANG, Fangmin XU, Haiyan CAO. Pilot interference mitigation for TDD cell-free massive MIMO systems[J]. Telecommunications Science, 2022, 38(5): 87-94.

Figures/Tables 6

References 12

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参数	取值
载波频率	1.9 GHz
带宽	20 MHz
AP天线高度	15 m
用户天线高度	1.65 m
噪声系数	9 dB
ρ_p	100 mW
ρ_u	100 mW
d₁	50 m
d₀	10 m
ζ	0.98
τ	20
T	200
ζ	0.98

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Pilot interference mitigation for TDD cell-free massive MIMO systems

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