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Non-iterative joint decoding and signal processing: Universal coding approach for channels with memory.

机译:非迭代联合解码和信号处理:带内存通道的通用编码方法。

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摘要

A non-iterative receiver is proposed to achieve near capacity performance on intersymbol interference (ISI) channels. There are two main ingredients in the proposed design. (i) The use of a novel BCJR-DFE equalizer which produces optimal soft estimates of the inputs to the ISI channel given all the observations from the channel and L past symbols exactly, where L is the memory of the ISI channel. (ii) The use of an encoder structure that ensures that L past symbols can be used in the DFE in an error free manner through the use of a capacity achieving code for a memoryless channel. Computational complexity of the proposed receiver structure is less than that of one iteration of the turbo receiver. We also provide the proof showing that the proposed receiver achieves the i.i.d. capacity of any constrained input ISI channel. This DFE-based receiver has several advantages over an iterative (turbo) receiver, such as low complexity, the fact that codes that are optimized for memoryless channels can be used with channels with memory, and finally that the channel does not need to be known at the transmitter. The proposed coding scheme is universal in the sense that a single code of rate r, optimized for a memoryless channel, provides small error probability uniformly across all AWGN-ISI channels of i.i.d. capacity less than r.; This general principle of a proposed non-iterative receiver also applies to other signal processing functions, such as timing recovery, pattern-dependent noise whitening, joint demodulation and decoding etc. This makes the proposed encoder and receiver structure a viable alternative to iterative signal processing. The results show significant complexity reduction and performance gain for the case of timing recovery and patter-dependent noise whitening for magnetic recording channels.
机译:提出了一种非迭代接收机,以在符号间干扰(ISI)信道上实现接近容量的性能。提议的设计中有两个主要成分。 (i)使用一种新颖的BCJR-DFE均衡器,该均衡器给出了ISI通道输入的最佳软估计,并给出了来自该通道的所有观察结果以及L个过去的符号,其中L是ISI通道的内存。 (ii)使用编码器结构,该编码器结构通过使用用于无存储信道的容量实现代码来确保可以以无错误的方式在DFE中使用L个过去的符号。所提出的接收器结构的计算复杂度小于turbo接收器的一次迭代的计算复杂度。我们还提供证明表明拟议的接收器达到了i.i.d.任何受约束的输入ISI通道的容量。这种基于DFE的接收器具有比迭代(涡轮)接收器更多的优势,例如低复杂度,针对无内存信道优化的代码可以与具有内存的信道一起使用,最后不需要知道该信道的事实。在发射器上。在为无记忆信道优化的速率为r的单个代码在i.d.的所有AWGN-ISI信道上均匀地提供小的错误概率的意义上,所提出的编码方案是通用的。容量小于r。所提出的非迭代接收机的一般原理也适用于其他信号处理功能,例如定时恢复,与模式相关的噪声白化,联合解调和解码等。这使得所提出的编码器和接收机结构成为迭代信号处理的可行替代方案。 。结果表明,对于磁记录通道的定时恢复和与模式有关的噪声白化,可以显着降低复杂度并提高性能。

著录项

  • 作者

    Nangare, Nitin Ashok.;

  • 作者单位

    Texas A&M University.;

  • 授予单位 Texas A&M University.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 2006
  • 页码 130 p.
  • 总页数 130
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;
  • 关键词

  • 入库时间 2022-08-17 11:39:35

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