基于不完美CSI的水声自适应功率分配算法

doi:10.12305/j.issn.1001-506X.2023.09.34

Abstract

Abstract:

The underwater acoustic channel faces the problems of limited bandwidth and complex environment.To improve the underwater communication rate, the marine application using the underwater acoustic sensor networks need adaptive communication.The traditional resource allocation algorithm using signal-noise ratio cannot accurately express the statistical characteristics of the fading channel.Although the method of reinforcement learning and convolutional neural network to predict the channel can improve accuracy of channel state information(CSI), it requires long observation and massive training samples, it is unsuitable for underwater acoustic environment. Thus, a relay amplification and forwarding cooperative orthogonal frequency division multiplexing(OFDM) communication model is constructed to solve the problem of low transmission efficiency of direct communication due to floating nodes. And an adaptive resource allocation algorithm based on OFDM in delay feedback CSI is proposed, which uses conditional probability to characterize imperfect CSI to adjust adaptive communication parameters, and conducts ergodic capacity maximization modeling. The simulation results show that it realizes joint adaptive allocation of power and bits, and the averager transmission rate is better than the power allocation algorithm with direct feedback of CSI, the proposed algorithm is more suitable for the energy-limited underwater acoustic sensor networks.

Key words: underwater acoustic sensor networks, relay cooperative orthogonal frequency division multi-plexing (OFDM) communication system, imperfect channel state information (CSI), adaptive power bit allocation

CLC Number:

TP393

Zhigang JIN, Huan YIN, Yishan SU. Underwater acoustic adaptive power allocation algorithm based on imperfect CSI[J]. Systems Engineering and Electronics, 2023, 45(9): 2941-2948.

Figures/Tables 12

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References 29

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模式	调制方式	阈值区间/dB
1	BPSK	SNR≤5
2	4QAM	5＜SNR≤9
3	8QAM	9＜SNR≤14
4	16QAM	14＜SNR

实验参数	取值
水深/m	5 000
通信半径/m	2 000
声速/(m/s)	1 500
海面波动幅度/m	±1
通信距离变化/m	±2
子载波总数量	64
水下节点数量	50
带宽/kHz	6(21~27)

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Underwater acoustic adaptive power allocation algorithm based on imperfect CSI

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