期刊
APPLIED ACOUSTICS
卷 211, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.apacoust.2023.109566
关键词
Inter -frequency interference; Underwater acoustic communication; Single -carrier frequency domain equalization; Subblocks; Kalman
类别
This paper proposes an iterative subblock-based receiver algorithm to address the issue of inter-frequency interference in underwater acoustic communication caused by time-variant channels. The algorithm divides each time-varying block into multiple quasi-static subblocks and uses a Kalman filter to track smoothly variant channels between adjacent subblocks, leading to better equalization.
Traditional single-carrier frequency domain equalization (SC-FDE) systems assume time-invariant channels that are difficult to realize in underwater acoustic (UWA) communication over block-based durations, leading to inter-frequency interference (IFI). Currently available approaches to resolving this issue involve shortening the block or inserting frequent training sequences at the cost of additional information from the channel and reduced spectral efficiency. This paper proposes an iterative subblock-based receiver algorithm that divides each timevarying block into multiple quasi-static subblocks. The designed receiver has a two-step structure consisting of block processing and cascaded subblock processing, where the former generates prior symbolic knowledge and the latter iteratively weakens IFI. We consider smoothly variant channels between adjacent subblocks and track them using a Kalman filter, leading to a more accurate estimation of the IFI and better equalization. The proposed algorithm was tested through simulations and experiments in Qiandao Lake and the Yellow Sea using blocks of different lengths and numbers of subblocks and elements in the array. The results provide a low bit error rate.
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