Interference Cancellation in Multiuser Acoustic Underwater Networks Using Probabilistic SDMA
Interference Cancellation in Multiuser Acoustic Underwater Networks Using Probabilistic SDMA
复制标题
使用概率 SDMA 消除多用户水下声学网络中的干扰
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
D. Pompili
中科院分区：
文献类型：
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作者：
M. Rahmati;D. Pompili
在恶劣的水声环境中，抗干扰是多用户通信中一个重要而又具有挑战性的问题。针对水下螺旋桨驱动的自主水下航行器（AUV）或浮力驱动的滑翔器存在的固有位置不确定性，提出了一种新的基于偏离角（AOD）的定位方法。研究了一种基于置信区间估计的概率空分多址接入技术，讨论了一种有效的干扰统计管理方法。此外，提出了一个优化问题，以减轻多用户干扰，同时保持发射机天线的波束宽度在一个理想的值，以便找到一个折衷之间（i）传播的波束朝向接收机，以打击位置的不确定性，（ii）集中这样的波束，以最大限度地减少分散，（iii）最大限度地减少对周围的其他车辆的干扰。提出了一种混合的时分多址（TDMA）方法来克服多用户干扰的解决方案和算法。仿真结果表明，与传统的TDMA和SDMA方法相比，该方法在降低统计干扰的同时，降低了分组重传率，并获得了信干噪比（SINR）增益和速率效率。
Combating interference is an important yet challenging issue for multiuser communications especially in the harsh underwater acoustic environment. In this paper, a novel Angle-Of-Departure (AOD)-based technique is proposed, which accounts for the inherent position uncertainty of underwater propeller-driven Autonomous Underwater Vehicles (AUVs) or buoyancy-driven gliders. A new probabilistic Space Division Multiple Access (SDMA) technique is studied using confidence interval estimation, and an effective approach to manage interference statistically is discussed. Also, an optimization problem is proposed to mitigate multiuser interference while keeping the transmitter antennae beam width at a desirable value so to find a trade off among (i) spreading the beam towards the receiver to combat position uncertainty, (ii) focusing such beam to minimize dispersion, and (iii) minimizing interference to other vehicles in the surrounding. Solutions and algorithms are proposed to overcome the multiuser interference via a hybrid SDMA-Time Division Multiple Access (TDMA) method. Simulation results show that the solution mitigates statistical interference, lessens packet retransmission rate, and obtains Signal-to-Interference-plus-Noise Ratio (SINR) gain and rate efficiency over conventional TDMA and SDMA methods.