基于1D-Concatenate的信道估计DNN模型优化方法

doi:10.11959/j.issn.1000-0801.2023097

Abstract

Abstract:

In order to improve the channel estimation accuracy of DNN model in wireless communication, a DNN model optimization method based on 1D-Concatenate was proposed.In this method, Concatenate performs one-dimensional data transformation, the DNN model was introduced by hopping connection, the gradient disappearance problem was suppressed, and 1D-Concatenate was used to restore the data features lost during network training to improve the accuracy of DNN channel estimation.In order to verify the effectiveness of the optimization method, a typical DNN-based wireless communication channel estimation model was selected for comparative simulation experiments.Experimental results show that the estimated gain of the existing DNN model can be increased by 77.10% by the proposed optimization method, and the channel gain can be increased by up to 3 dB under high signal-to-noise ratio.This optimization method can effectively improve the channel estimation accuracy of DNN model in wireless communication, especially the improvement effect is significant under high signal-to-noise ratio.

Key words: channel estimation, deep neural network, Concatenate dimension conversion, data feature recovery

CLC Number:

TN393

Min LU, Zehao QIN, Zhihui CHEN, Min ZHANG, Guangxue YUE. 1D-Concatenate based channel estimation DNN model optimization method[J]. Telecommunications Science, 2023, 39(4): 71-86.

Figures/Tables 17

References 21

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网络层名称	网络类型	输出大小
Input	Feature Input	(54,1)
FC 1	Fully Connected	Size of baseline model
FC 2	Fully Connected	Size of baseline model
…	…	…
…	…	…
…	…	…
FC L-1	Fully Connected	Size of baseline model
1D-Concat	Concat[FC 2, FC L-1]	(Size of(FC 2+FC L-1),1)
FC L	Fully Connected	（108,1）
Output	Regression Output	Regression

发射端参数		衰落信道参数
名称	值	名称	值
子载波数	64	路径时延	[0.0 0.5 1.2]×10^-6
导频数	27	平均路径增益	[0.1 0.5 0.2]
符号数	4	直射路径多普勒偏移	5.0
发射帧数	1 000	直射路径初始相位	0.5
保护子载波数	4	最大多普勒频移	50
调制方式	BPSK	信道类型	Rice+AWGN

基准模型	优化方法	改进模型
FC-DNN	基于1D-Concatenate的	DenseFC-DNN
SimNet	信道估计 DNN 模型	DenseSimNet
DL-based	优化方法	DenseDL-based
LS_RefineNet		DenseLS_RefineNet
DNN-1		DenseDNN-1
DNN-2		DenseDNN-2

模型名称	数据名称				数值
DenseSimNet	初始学习率	0.010	0.015	0.020	0.025	0.030	0.035	0.040
	平均MSE×10²	1.61	1.51	1.48	1.46	1.45	1.45	1.45
DenseFC-DNN	初始学习率	0.030	0.035	0.040	0.045	0.050	0.055	0.060
	平均MSE×10²	2.48	1.98	1.73	1.74	2.14	1.79	1.78
DenseDL-based	初始学习率	0.010	0.015	0.020	0.025	0.030	0.035	0.040
	平均MSE×10²	2.33	2.03	1.93	1.82	1.86	1.67	1.68
DenseLS_RefineNet	初始学习率	0.010	0.015	0.020	0.025	0.030	0.035	0.040
	平均MSE×10²	1.53	1.46	1.45	1.44	1.44	1.44	1.44
DenseDNN-1	初始学习率	0.005	0.010	0.015	0.020	0.025	0.030	0.035
	平均MSE×10²	3.30	3.00	3.11	3.09	2.67	2.87	2.69
DenseDNN-2	初始学习率	0.005	0.010	0.015	0.020	0.025	0.030	0.035
	平均MSE×10²	2.41	1.55	1.48	1.43	1.38	1.42	1.42

模型名称			SNR
模型名称	1 dB	4 dB	7 dB	10 dB	13 dB
DenseSimNet	2.91	3.31	2.71	3.01	2.84
DenseFC-DNN	2.20	1.91	1.93	1.77	2.10
DenseDL-based	2.01	1.76	1.74	1.81	2.05
DenseLS_RefineNet	1.68	1.46	1.44	1.47	1.60
DenseDNN-1	3.00	3.01	3.16	3.02	3.09
DenseDNN-2	1.81	1.43	1.40	1.44	1.53

1D-Concatenate based channel estimation DNN model optimization method

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