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arXiv 2404.10367cs.ITmath.IT
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通过空间耦合在时变码间干扰信道上实现鲁棒性能

Robust Performance Over Changing Intersymbol Interference Channels by Spatial Coupling

Mgeni Makambi Mashauri, Alexandre Graell i Amat, Michael Lentmaier

AI总结:

本研究提出采用空间耦合LDPC码解决时变ISI信道下经典LDPC码性能鲁棒性差的问题,无需发射端信道适配即可接近对称信息率,还能让LMMSE检测器性能逼近最优检测器水平。

摘要:

我们证明,空间耦合低密度奇偶校验(LDPC)码在搭配最优及次优检测器时,能在时变码间干扰(ISI)信道上实现鲁棒性能。我们将其性能与经典LDPC码设计方案进行对比,经典方案需针对给定(已知)信道优化度分布。我们证实,这类经典方案虽在针对特定信道设计时表现优异,但在信道切换后性能可能大幅下降。而空间耦合LDPC码仅用单一码型就能获得接近对称信息率的性能,无需在发射端知晓信道信息并进行适配。我们还研究了搭配线性最小均方误差(LMMSE)检测器的阈值饱和现象,表明通过空间耦合,其性能可显著接近正则LDPC码搭配最优检测器的水平。

英文摘要:

We show that spatially coupled low-density parity-check (LDPC) codes yield robust performance over changing intersymbol interfere (ISI) channels with optimal and suboptimal detectors. We compare the performance with classical LDPC code design which involves optimizing the degree distribution for a given (known) channel. We demonstrate that these classical schemes, despite working very good when designed for a given channel, can perform poorly if the channel is exchanged. With spatially coupled LDPC codes, however, we get performances close to the symmetric information rates with just a single code, without the need to know the channel and adapt to it at the transmitter. We also investigate threshold saturation with the linear minimum mean square error (LMMSE) detector and show that with spatial coupling its performance can get remarkably close to that of an optimal detector for regular LDPC codes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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