Bandwidth-efficient frequency-domain equalization for single carrier multiple-input multiple-output underwater acoustic communications.
Bandwidth-efficient frequency-domain equalization for single carrier multiple-input multiple-output underwater acoustic communications.
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DOI：
10.1121/1.3480569
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发表时间：
2010-11
期刊：
影响因子：
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通讯作者：
Jian Zhang;Y. R. Zheng
中科院分区：
文献类型：
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作者：
Jian Zhang;Y. R. Zheng
本文提出了一种具有带宽高效频域均衡（FDE）的单载波（SC）接收器方案，用于采用多个换能器和多个水听器的水声（UWA）通信。与对整个数据块执行FDE的FDE方法不同，该算法通过将大块划分为小子块来实现重叠窗口FDE。决策引导的信道估计方案与重叠窗口 FDE 相结合，以跟踪信道变化并改善误差性能。该算法显着增加了每个块的长度，并保持每个块的训练符号数量相同，从而在不降低性能的情况下实现更好的数据效率。该方案通过 2008 年 3 月重新调度声学通信实验 (RACE) 中收集的海底数据进行了测试。在没有编码的情况下，2×12 MIMO 重叠窗口 FDE 与传统 SC-FDE 方案相比，在相同的数据效率下，对于 400 m 和 1000 m 范围的系统，平均误码率 (BER) 分别降低了 74.4% 和 84.6%。如果需要相同的 BER 性能，所提出的算法仅具有 8.4% 的传输开销，而其他现有 UWA OFDM 和 SC-FDE 系统中超过 20% 的开销。所提出的 FDE 方案的数据效率和/或错误性能的提高是通过比传统 SC-FDE 方案稍微增加的计算复杂性来实现的。
This paper proposes a single carrier (SC) receiver scheme with bandwidth-efficient frequency-domain equalization (FDE) for underwater acoustic (UWA) communications employing multiple transducers and multiple hydrophones. Different from the FDE methods that perform FDE on a whole data block, the proposed algorithm implements an overlapped-window FDE by partitioning a large block into small subblocks. A decision-directed channel estimation scheme is incorporated with the overlapped-window FDE to track channel variations and improve the error performance. The proposed algorithm significantly increases the length of each block and keeps the same number of training symbols per block, hence achieving better data efficiency without performance degradation. The proposed scheme is tested by the undersea data collected in the Rescheduled Acoustic Communications Experiment (RACE) in March 2008. Without coding, the 2-by-12 MIMO overlapped-window FDE reduces the average bit error rate (BER) over traditional SC-FDE schemes by 74.4% and 84.6% for the 400 m and 1000 m range systems, respectively, at the same data efficiency. If the same BER performance is required, the proposed algorithm has only 8.4% transmission overhead, comparing to over 20% overhead in other existing UWA OFDM and SC-FDE systems. The improved data efficiency and/or error performance of the proposed FDE scheme is achieved by slightly increased computational complexity over traditional SC-FDE schemes.