Different from the mechanism of medium access control (MAC) for the land-based sensor networks. the underwater acoustic sensor network faces problems such as high propagation delay. spatial-temporal uncertainty and high energy consumption. Orthogonal frequency division multiple access (OFDMA) is a channel access mechanism based on OFDM multi-carriers modulation technology. https://safeersappliancers.shop/product-category/chrome-lpg-convertible-kenwood-ck307g-90-cm-dual-fuel-range-cooker-black/