论文标题

非线性光声通信的蒸气云延迟DPPM调制技术

Vapor Cloud Delayed-DPPM Modulation Technique for nonlinear Optoacoustic Communication

论文作者

Mahmud, Muntasir, Younis, Mohamed, Islam, Md Shafiqul, Choa, Fow-Sen, Carter, Gary

论文摘要

光声过程可以解决从空降单元到水下节点(UWN)的无线信息传输的长期挑战。适当的激光参数产生的非线性光声信号可以在水中繁殖。但是,形成这样的信号需要高功率激光器,而蒸气云的堆积排除了随后的声信号产生。因此,追求传统的On-Off键合(OOK)调制技术将限制数据速率和功率效率。在本文中,我们分析了不同的调制技术,并提出了蒸气云延迟差异脉冲位置调制(VCD-DPPM)技术,以提高数据速率并实现单个固定激光发射器的高功率效率。 VCD-DPPM的符号率分别使用激光重复速率为10 kHz和40 Hz,比我们的文本通信模拟中的OOK高约6.9倍和1.69倍。此外,在两种情况下,VCD-DPPM的功率效率比OOK技术高137%。我们已经在实验室条件下产生了不同的声学信号水平,并为UWN的不同深度和位置模拟了位错误率(BER),同时考虑了环境水下噪音。我们的结果表明,VCD-DPPM可以实现有效的数据传输。

The optoacoustic process can solve the longstanding challenge of wireless information transmission from an airborne unit to an underwater node (UWN). The nonlinear optoacoustic signal generated by proper laser parameters can propagate long distances in water. However, forming such a signal requires a high-power laser, and the buildup of a vapor cloud precludes the subsequent acoustic signal generation. Therefore, pursuing the traditional on-off keying (OOK) modulation technique will limit the data rate and power efficiency. In this paper, we analyze different modulation techniques and propose a vapor cloud delayed-differential pulse position modulation (VCD-DPPM) technique to improve the data rate and achieve high power efficiency for a single stationary laser transmitter. The symbol rate of VCD-DPPM is approximately 6.9 times and 1.69 times higher than OOK in our text communication simulation using a laser repetition rate of 10 kHz and 40 Hz, respectively. Furthermore, VCD-DPPM is 137% more power efficient than the OOK technique for both cases. We have generated different acoustic signal levels in laboratory conditions and simulated the bit error rate (BER) for different depths and positions of the UWN, while considering ambient underwater noises. Our results indicate that VCD-DPPM enables efficient data transmission.

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