基于高斯似然的精准水声信道估计

doi:10.12305/j.issn.1001-506X.2024.01.38

Abstract

Abstract:

Aiming at the multi-path interference problem of the time-varying underwater acoustic channel, an accurate underwater acoustic channel estimation algorithm based on Gaussian likelihood (GL) is proposed. The Gauss probability density functions of the multiple segments are multiplied, the product result still follows the Gauss distribution, and the variance becomes smaller, leading to the improvement of channel estimation accuracy. The superimposed training (ST) scheme is used, where the training sequence and the symbol sequence are linearly superimposed, so that the training sequence can be continuously transmitted, thereby the real-time tracking of the time-varying channel is realized. The ST scheme, GL algorithm, and Turbo equalization are jointly performed in an iterative manner, where the estimated symbol sequence is used as a virtual training sequence to further improve the estimation and tracking performance of the channel. Accurate estimation and real-time tracking of the time-varying underwater acoustic channel are realized through multiple iteration calculation. Finally, the effectiveness of the proposed algorithm is verified by simulation and experimental results (the horizontal distance of the moving transceivers is 500 m and 5.5 km) in Jiaozhou Bay.

Key words: time-varying underwater acoustic channel, Gaussian likelihood (GL), superimposed training (ST) scheme, virtual training sequence

CLC Number:

TN929.3

Guang YANG, Peiyue QIAO, Junyan LIANG, Zhengchang QIN, Xiaodong GONG, Xiuhui NI. Accurate underwater acoustic channel estimation based on Gaussian likelihood[J]. Systems Engineering and Electronics, 2023, 46(1): 334-344.

Figures/Tables 18

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References 32

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参数	仿真	胶州湾500 m	胶州湾5.5 km
编码效率	1/4	1/8	1/4
功率比r	0.25∶1	0.25∶1	0.25∶1
短块长度/sym	256, 512	256	256
CP/sym	128	16	16
1帧, 1个数据块	60块, 512 bits	16块, 256 bits	16块, 512 bits
调制方式	-	IQ调制	IQ调制
映射, 系统	QPSK, 基带	QPSK, 单载波	QPSK, 单载波
1个数据块的时间长度/s	-	0.27	0.27
1个符号的时间长度/s	-	2.5×10^－4	2.5×10^－4
中心频率, 滤波	-	12 kHz, 带通	12 kHz, 带通
带宽/kHz	4	4	4
采样频率/kHz	-	96	96
传输速率/(bits/s)	-	3 765	3 765
频带利用率/ (bps/Hz)	-	0.94	0.94
通信距离/m	-	500	5 500
换能器深度/m	-	4	4
水听器深度/m	-	5	5
相对速度/(m/s)	-	2	0.5
SINR/dB	9~12	14	14

参数	数值
通信频率	9~14 kHz(实际使用10~14 kHz)
通信距离	6 000 m(高SINR)
工作深度	2 000 m
电气参数	接收功率0.6 W; 传输功率10~60 W, 内置400 Wh充电电池; RS-232接口
力学参数	长790 mm×宽(直径)130 mm; 重量15 kg(含电池)

块编号	α=auto		α=0		α=1
	迭代次数		迭代次数		迭代次数
	0	1	0	1	0	1
1	0	0	0	0	0	0
2	0	0	0	0	0	0
3	0	0	0	0	0	0
4	0	0	0	0	0	0
5	0	0	0	0	0	0
6	0	0	0	0	0	0
7	0	0	0	0	0	0
8	0	0	0	0	0	0
9	0	0	0	0	0	0
10	0	0	3.6%	0	0	0
11	0	0	11.2%	0	0	0
12	0	0	8.8%	0	0	0
13	0	0	14.4%	0	0	0
14	0	0	0.4%	0	0	0
15	0	0	18.0%	0	0	0
16	13.6%	0	30.8%	26.0%	14.0%	0
均值	0.9%	0	5.5%	1.6%	0.9%	0

块编号	α=auto		α=0		α=1
	迭代次数		迭代次数		迭代次数
	0	1	0	1	0	1
1	11.6	0	45.2	41.2	15.0	1.0
2	14.4	0	40.6	38.1	17.6	3.6
3	3.4	0	29.2	28.8	5.9	0
4	6.7	0	42.8	38.7	10.8	0
5	14.4	0	31.2	28.6	14.4	0.6
6	8.1	0	36.5	20.3	5.5	0
7	0.4	0	14.4	1.2	0.4	0
8	0.2	0	20.1	4.1	0	0
9	0	0	24.1	10.5	0.8	0
10	0.8	0	22.1	3.6	0	0
11	0	0	5.1	0	0	0
12	0	0	26.4	9.5	0	0
13	0	0	3.6	0	0.8	0
14	0	0	5.5	0	0	0
15	0	0	18.3	0	0	0
16	0.8	0	27.6	4.3	0.8	0
均值	3.8	0	24.5	14.3	4.5	0.3

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Accurate underwater acoustic channel estimation based on Gaussian likelihood

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