Block iterative FDE for MIMO underwater acoustic communications

2016 IEEE/OES China Ocean Acoustics (COA) Pub Date : 1900-01-01 DOI:10.1109/COA.2016.7535772

W. Duan, Y. R. Zheng, Dajun Sun, Youwen Zhang

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引用次数: 3

Abstract

In this paper, we propose a low complexity iterative detection scheme for the uncoded zero padding (ZP) single carrier (SC) transmission in Multiple-input Multiple-output (MIMO) underwater acoustic (UWA) channels. Due to the long multipath in UWA channels, ZP SC-FDE has to use large block size to achieve low computational complexity and high data efficiency. But, the higher bandwidth efficiency results in more sever channel estimation error and performance degradation. To enhance the performance of the ZP SC systems with high data efficiency, we design a soft-decision block iterative frequency-domain equalization (BI-FDE) combined with iterative channel estimation. With increasing reliability as the the iteration proceeds, the soft decision symbols obtained at the previous iteration are used to re-estimate the channel, thus improving the overall system performance. Since both the feedfoward and feedback filters are designed in frequency domain without the aid of channel coding, the proposed SD BI-FDE scheme is affordable for real-time implementation. The performance enhancement of the proposed iterative receiver has been verified through a pool test.

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MIMO水声通信的块迭代FDE

针对多输入多输出(MIMO)水声(UWA)信道中无编码零填充(ZP)单载波(SC)传输，提出了一种低复杂度迭代检测方案。由于UWA信道的多径较长，ZP SC-FDE必须使用较大的块大小来实现低计算复杂度和高数据效率。但是，较高的带宽效率会导致更严重的信道估计误差和性能下降。为了提高ZP SC系统的性能和数据效率，我们设计了一种结合迭代信道估计的软判决块迭代频域均衡(BI-FDE)方法。随着迭代的进行，可靠性不断提高，利用前一次迭代获得的软决策符号对信道进行重新估计，从而提高了系统的整体性能。由于前馈和反馈滤波器都是在频域中设计的，无需通道编码，因此所提出的SD BI-FDE方案可以实现实时。通过池测试验证了所提出的迭代接收机的性能增强。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

2016 IEEE/OES China Ocean Acoustics (COA)

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