Performing effective medium access control (MAC) encounters great challenges for mobile underwater acoustic networks (UANs), because it suffers from low signal-to-noise ratio, Doppler shift, large communication latency, and so on. Multi-carrier code-division multiple access (MC-COMA) is a promising modulation technique appropriate for solving the above restrictions. In this article, we design a novel MC-COMA-based cross-layer MAC scheme for mobile UANs, called MCI-MAC, to achieve efficient high-concurrency communication. Specifically, this method allocates spread spectrum sequences dynamically on the basis of velocity, propagation distance, data size, and data grade to improve robustness and flexibility of communication. Moreover, we propose an ant-colony-based optimal channel selection algorithm to decrease inter-carrier interference and inter-symbol interference, which concurrently maximizes energy efficiency and network throughput. In addition, we further propose a solution to solve multihop networks' collisions. Simulation results show that MCI-MAC is more effective than the state-of-the-art methods in mobile UANs.

中文翻译：

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一种基于MC-CDMA的移动水下声网高效媒体接入控制方案

执行有效的媒体访问控制 (MAC) 对移动水声网络 (UAN) 来说是一个巨大的挑战，因为它存在低信噪比、多普勒频移、大通信延迟等问题。多载波码分多址（MC-COMA）是一种适用于解决上述限制的有前途的调制技术。在本文中，我们设计了一种新颖的基于 MC-COMA 的移动 UAN 跨层 MAC 方案，称为 MCI-MAC，以实现高效的高并发通信。具体而言，该方法根据速度、传播距离、数据大小和数据等级动态分配扩频序列，以提高通信的鲁棒性和灵活性。而且，我们提出了一种基于蚁群的最优信道选择算法，以减少载波间干扰和符号间干扰，同时最大限度地提高能源效率和网络吞吐量。此外，我们进一步提出了一种解决多跳网络冲突的解决方案。仿真结果表明，MCI-MAC 比移动 UAN 中最先进的方法更有效。