Iterative design and detection of a DFE in the frequency domain
Iterative design and detection of a DFE in the frequency domain
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DOI：
10.1109/tcomm.2005.858666
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发表时间：
2005-11
影响因子：
8.3
通讯作者：
N. Benvenuto;S. Tomasin
中科院分区：
文献类型：
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作者：
N. Benvenuto;S. Tomasin
误差传播现象和滤波器设计的计算复杂性是现有色散信道判决反馈均衡器（DFE）的重要缺点。在本文中，我们提出了一种新的迭代块DFE（IBDFE），它迭代地操作块的接收信号。实际上，必须使用合适的数据传输格式以允许借助于离散傅立叶变换在频域中有效地实现均衡器。两种设计方法被认为是。在第一种方法中，硬检测数据被用作反馈的输入，并且根据检测数据和发送数据之间的相关性来设计滤波器。在第二种方法中，反馈信号直接从在前一次迭代的均衡信号的软检测设计。IBDFE设计中所涉及的参数的估计也来自。从无线色散衰落信道上的性能仿真，我们观察到IBDFE优于现有的DFE。此外，IBDFE表现出减少的计算复杂度相比，现有的计划，无论是在信号处理和滤波器的设计。
Error-propagation phenomena and computational complexity of the filters' design are important drawbacks of existing decision-feedback equalizers (DFE) for dispersive channels. In this paper, we propose a new iterative block DFE (IBDFE) which operates iteratively on blocks of the received signal. Indeed, a suitable data-transmission format must be used to allow an efficient implementation of the equalizer in the frequency domain, by means of the discrete Fourier transform. Two design methods are considered. In the first method, hard detected data are used as input of the feedback, and filters are designed according to the correlation between detected and transmitted data. In the second method, the feedback signal is directly designed from soft detection of the equalized signal at the previous iteration. Estimators of the parameters involved in the IBDFE design are also derived. From performance simulations on a wireless dispersive fading channel, we observed that the IBDFE outperforms existing DFEs. Moreover, the IBDFE exhibits a reduction of the computational complexity when compared against existing schemes, both in signal processing and in filter design.