基于反馈信道状态信息的水声自适应OFDMA

doi:10.12305/j.issn.1001-506X.2021.08.35

Abstract

Abstract:

In time-varying underwater acoustic channel, in order to improve the resource allocation performance of adaptive orthogonal frequency division multiple access (OFDMA) under the condition of channel state information (CSI) with time delay feedback, a multi node CSI feedback time-slot reuse access method is proposed to reduce the feedback time delay. And two kinds of feedback CSI characterization parameters, carrier time-frequency correlation coefficient and carrier time-frequency mean are presented. Through experimental data, the two kinds of feedback CSI parameters and their influence on the performance of underwater acoustic adaptive OFDMA is analyzed. Further more, a multi-node fair adaptive joint allocation algorithm of carrier, bit and power is proposed to minimize the bit error rate under the constraints of maximum power and node throughput. The results of simulation and lake experiment data show that the bit error rate of the underwater acoustic adaptive OFDMA system is lower than that of the interleaved carrier allocation system under various feedback CSI conditions, which indicates that it has good performance in practical underwater acoustic channel applications.

Key words: underwater acoustic communication, orthogonal frequency division multiple access (OFDMA), channel state information (CSI), time delay, resource allocation

CLC Number:

TN929.3

Yuzhi ZHANG, Yanjing SUN, Bin WANG, Yang LIU. Underwater acoustic adaptive OFDMA based on feedback channel state information[J]. Systems Engineering and Electronics, 2021, 43(8): 2321-2331.

Figures/Tables 16

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References 18

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参数	含义
t_RTS	RTS发送初始时刻
t_{CTS, n}	节点n回复CTS时刻
t_{CSI, n}	节点n测得CSI时刻
T_n	节点n到主节点的传播时间
T_RTS/T_CTS	RTS/CTS持续时间
T_{Wait, n}	冲突退避等待时间

参数	取值
水深/m	100
收发机深度/m	20
通信距离/m	800, 1 000, 1 500, 2 000
声速/(m·s^-1)	1 500
频率范围/kHz	14~20
频率分辨率/Hz	6.25
仿真时间/s	180
时间分辨率/s	0.05
海面波动幅度/m	±1
收发机垂直位移/m	±1
通信距离变化/m	±2

子载波类型	位置	个数
子载波总数量	整个频带14~20 kHz	K=1 024
数据载波数量	频带中间、与导频间隔	K_d=672
导频载波数量	1 024个载波中均匀	K_p=256
空载波数量	频带两边及中间	K_n=96(两边48+中间48)

方案	BER
方案	节点1	节点2	节点3
①固定交织	0.017 7	0.029 8	0.044
②自适应均值	0.011 9	0.021 6	0.044
③自适应RTS	0.013 9	0.024 1	0.044
④自适应ANC	0.011 4	0.021 7	0.042
⑤自适应ANC-ρ	0.016	0.019 1	0.042
⑥实际数据包	0.009 1	0.011 5	0.032 8

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Underwater acoustic adaptive OFDMA based on feedback channel state information

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