An adaptive OFDMA-based MAC protocol for underwater acoustic wireless sensor networks.
An adaptive OFDMA-based MAC protocol for underwater acoustic wireless sensor networks.
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DOI：
10.3390/s120708782
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Khreishah A
中科院分区：
文献类型：
--
作者：
Khalil IM;Gadallah Y;Hayajneh M;Khreishah A
水声无线传感器网络在民用和军事领域有着广泛的应用。然而，它们受到声学信号的有限可用带宽和恶劣水下条件的影响。在这项工作中，我们提出了一个正交频分多址（OFDMA）为基础的媒体访问控制（MAC）协议，可配置，以适应水下传感器网络的操作要求。该协议有三种操作模式，即随机、机会均等和节能操作模式。我们的MAC设计方法利用衰落声信道的多径特性，将其转换为并行的独立的声子信道，进行平坦衰落。网络内的节点对之间的通信使用这些子信道的子集来完成，这取决于活动操作模式的配置。因此，可用的有限带宽得到充分利用，同时完全避免干扰。我们推导出最佳功率加载和子载波选择的数学模型，这是用来作为基础的协议的所有操作模式。我们还进行了许多模拟实验，以评估和比较我们的协议与其他码分多址（CDMA）为基础的MAC协议。
Underwater acoustic wireless sensor networks (UAWSNs) have many applications across various civilian and military domains. However, they suffer from the limited available bandwidth of acoustic signals and harsh underwater conditions. In this work, we present an Orthogonal Frequency Division Multiple Access (OFDMA)-based Media Access Control (MAC) protocol that is configurable to suit the operating requirements of the underwater sensor network. The protocol has three modes of operation, namely random, equal opportunity and energy-conscious modes of operation. Our MAC design approach exploits the multi-path characteristics of a fading acoustic channel to convert it into parallel independent acoustic sub-channels that undergo flat fading. Communication between node pairs within the network is done using subsets of these sub-channels, depending on the configurations of the active mode of operation. Thus, the available limited bandwidth gets fully utilized while completely avoiding interference. We derive the mathematical model for optimal power loading and subcarrier selection, which is used as basis for all modes of operation of the protocol. We also conduct many simulation experiments to evaluate and compare our protocol with other Code Division Multiple Access (CDMA)-based MAC protocols.
影响因子：
5.6
作者：
Kredo, Kurtis, II;Mohapatra, Prasant
通讯作者：
Mohapatra, Prasant