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arxiv: 1102.3056 · v2 · pith:H5G3GKOZnew · submitted 2011-02-15 · 💻 cs.IT · math.IT

A Phenomenological Study on Threshold Improvement via Spatial Coupling

classification 💻 cs.IT math.IT
keywords thresholdcouplingimprovementspatialphenomenologicalresultauthorsbelief-propagation
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Kudekar et al. proved an interesting result in low-density parity-check (LDPC) convolutional codes: The belief-propagation (BP) threshold is boosted to the maximum-a-posteriori (MAP) threshold by spatial coupling. Furthermore, the authors showed that the BP threshold for code-division multiple-access (CDMA) systems is improved up to the optimal one via spatial coupling. In this letter, a phenomenological model for elucidating the essence of these phenomenon, called threshold improvement, is proposed. The main result implies that threshold improvement occurs for spatially-coupled general graphical models.

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