自动增益控制对非合作干扰对消性能建模分析

doi:10.12305/j.issn.1001-506X.2024.12.06

Abstract

Abstract:

Automatic gain control (AGC) can meet the high dynamic requirements of non-cooperative interference cancellation system under strong interference scenario. How to quantitatively represent the impact of AGC on interference cancellation performance is the key to guide the design of multi-channel AGC scheme. This article derives the mapping relationship between the steady-state gain of AGC and the eigenvalues of the autocorrelation matrix through spectral analysis and feature subspace methods, and establishes a transient model of interference cancellation weight. Based on the analytical expression of interference cancellation weight, the influence law of steady-state gain on interference cancellation performance is analyzed in detail, and the relationship between steady-state gain and stability, convergence speed, and cancellation ratio is quantitatively expressed. Furthermore, further research on the effects of initial gain, step size, average step time, and multi-channel control strategies on the transient convergence characteristics of interference cancellation in the adjustment and control process of AGC can effectively guide the design of multi-channel AGC scheme. Simulation results verify the correctness of the weight transient model and the effectiveness of the interference cancellation performance analysis conclusion. Experimental results indicate that the theoretical and simulation analysis conclusions can be used to guide the engineering practice of AGC schemes.

Key words: non-cooperative interference cancellation, high dynamic, automatic gain control (AGC), weight transient model, interference cancellation performance

CLC Number:

TN975

Ze WANG, Fangmin HE, Qiaran LU, Yunshuo ZHANG, Zheyu LI, Jin MENG, Yaxing LI. Modeling and analysis of automatic gain control for non-cooperative interference cancellation performance[J]. Systems Engineering and Electronics, 2024, 46(12): 3981-3991.

Figures/Tables 12

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Table 1

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仿真参数	取值
采样率/Mbps	200
采样点数	10e6
主/辅天线个数	1/1
干扰源个数	1
干扰信号类型	单音干扰
干扰信号载波频率/MHz	100
主/辅通道延时/ns	1
热噪声功率/dBm	-104.77
ADC量化噪声/dBm	-84.33
接收端干扰信号功率/dBm	-66.02

仿真工况	参数设置
仿真工况	初始增益/dB	步长/dB	步长时间/ms
工况1	0
工况2	10	2	1
工况3	20
工况4		2
工况5	0	5	1
工况6		8
工况7			1
工况8	0	2	1.5
工况9			2

稳态增益	干扰对消比
10	70.2
20	77.8
30	83.3
40	87.4
50	87.5
60	87.5

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Modeling and analysis of automatic gain control for non-cooperative interference cancellation performance

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