CF-mMIMO系统中一种基于用户极坐标的低复杂度导频分配算法

doi:10.11959/j.issn.1000-0801.2023120

Abstract

Abstract:

Absrtact: In order to reduce the pilot contamination in the cell-free massive multi-input multi-output (MIMO) system, a low complexity pilot assignment algorithm based on user polar coordinates was proposed.Firstly, a Gaussian weighted density algorithm was proposed to determine a centroid as the polar coordinates center point in the system coverage area, then pre-assigned the pilot in order according to the angular coordinates, so that users who reused the same pilot had a greater probability of having a longer distance, and henced reduce the pilot contamination.A low complexity distance detection algorithm was then proposed to ensure that the user spacing between any two users multiplexing the same pilot was greater than the threshold.The simulation results show that the proposed pilot assignment algorithm effectively reduce pilot contamination, improve the uplink throughput of 95% users of the system, and achieve a good compromise between performance and complexity.

Key words: cell-free massive MIMO, pilot assignment, polar coordinates, Gaussian weighting, distance detection

CLC Number:

TN929.5

Shao GUO, Peng PAN, Yaozong FAN. A low complexity pilot assignment algorithm based on user polar coordinates in CF-mMIMO systems[J]. Telecommunications Science, 2023, 39(7): 1-10.

Figures/Tables 10

参数	取值
D、M、K	1 km、[200 300]、[40 60 80 100]
f、B	1.9 GHz、20 MHz
$h_{AP} 、 h_{UE}$	15 m、1.65 m
$N_{f} 、 σ_{s h}$	9 dB、8 dB
$ρ_{p} 、 ρ_{u}$	100 mW
$d_{0} 、 d_{1}$	10 m、50 m
$ξ_{th} 、 α$	80 m、0.9
$τ 、 τ_{c}$	[10 12 15 20]、200

References 16

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A low complexity pilot assignment algorithm based on user polar coordinates in CF-mMIMO systems

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