基于响应估计频域拟合的通道均衡方法

doi:10.12305/j.issn.1001-506X.2022.03.01

Abstract

Abstract:

The response of each antenna and radio frequency component of the array is different under large signal bandwidth, resulting in channel inconsistency and serious deterioration of the spectrum estimation performance of the array. Aiming at the problems that the antenna feeder cannot be calibrated by internal calibration, the performance of the existing external calibration methods is seriously affected by noise, and the blind adaptive process depends on the reference signal, a channel equalization method based on frequency domain fitting of response estimation of single external linear frequency modulation continuous triangular wave signal source is proposed. Firstly, the rough estimation of the channel response is obtained by the eigenvalue decomposition of the sliding covariance matrix and the ideal guidance vector of the known source. Then, based on the least square criterion, the accurate estimation of the channel response is obtained by harmonic model fitting. Finally, the equalizer response is obtained by combining out of band linear expansion and frequency domain polynomial fitting. The measured data processing results show that the proposed method has higher output signal to noise ratio and smaller angle estimation mean square error than other methods.

Key words: response estimation, channel equalization, channel mismatch, frequency domain fitting

CLC Number:

TN958.92

Zhengzhi WANG, Zhiwei YANG, Zhihao FAN. Channel equalization method based on response estimation and frequency domain fitting[J]. Systems Engineering and Electronics, 2022, 44(3): 713-721.

Figures/Tables 14

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响应误差		通道幅相误差的均值/均方根值
响应误差		通道1	通道2	通道3	通道4	通道5	通道6
幅度误差	接收数据	4.417 8e-05/0.025 5	0/0	5.386 2e-06/0.033 0	4.836 2e-05/0.023 7	3.391 5e-05/0.028 6	2.496 4e-05/0.032 9
幅度误差	拟合估计响应	4.529 4e-17/0.003 0	0/0	-5.079 3e-17/0.003 1	1.963 7e-17/0.002 6	-4.336 8e-17/0.003 0	-3.540 6e-17/0.005 1
相位误差	接收数据	-5.999 7e-07/0.033 8	0/0	-4.845 3e-06/0.044 2	-3.417 7e-06/0.034 4	-1.706 3e-05/0.034 5	-3.645 1e-06/0.054 9
相位误差	拟合估计响应	-4.026 3e-17/0.011 5	0/0	-4.473 9e-17/0.011 1	-2.621 2e-17/0.008 5	1.890 8e-17/0.006 2	1.922 1e-17/0.014 3

均衡方法		通道剩余失配的均值/均方根值
均衡方法		通道1	通道2	通道3	通道4	通道5	通道6
幅度剩余失配	接收数据	1.021 9/0.136 4	1/0	0.947 3/0.135 2	0.868 8/0.089 8	1.034 7/0.169 2	0.660 7/0.115 7
	本文方法	1.004 2/0.131 7	1.000 1/0.001 7	1.005 0/0.138 4	1.002 6/0.100 7	1.005 9/0.148 7	1.007 4/0.175 8
	频域最小二乘法	0.964 3/0.200 2	1/0	0.982 4/0.268 8	0.995 3/0.198 8	0.971 3/0.169 4	0.932 5/0.338 2
	傅里叶变换法	1.003 5/-0.211 1	1/0	1.047 8/0.304 5	1.004 9/0.207 5	1.106 6/0.216 1	0.969 9/0.356 4
相位剩余失配	接收数据	-0.606 1/0.126 6	0/0	-0.528 5/0.143 8	-0.627 0/0.100 0	-0.783 2/0.230 8	-0.489 1/0.169 9
	本文方法	0.000 1/0.113 8	0/0	-0.002 2/0.121 4	-0.003 0/0.092 7	-0.000 1/0.120 1	-0.002 5/0.143 3
	频域最小二乘法	0.004 4/0.196 4	0/0	0.037 9/0.242 3	0.002 2/0.214 2	0.048 5/0.207 2	0.097 7/0.298 6
	傅里叶变换法	-0.044 8/0.201 6	0/0	-0.019 2/0.253 5	-0.083 3/0.218 8	0.043 6/0.288 8	0.116 0/0.299 9

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Channel equalization method based on response estimation and frequency domain fitting

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