A Phenomenological Study on Threshold Improvement via Spatial Coupling

• DOI: 10.1587/transfun.e95.a.974
• Publication Date: 2012-05-24T06:43:22Z
• Authors: Keigo TAKEUCHI; Toshiyuki TANAKA; Tsutomu KAWABATA
• Keywords: Threshold model; Belief Propagation

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) by spatial coupling. Furthermore, authors showed that BP for code-division multiple-access (CDMA) systems improved up optimal one via In this letter, a phenomenological model elucidating essence of these phenomenon, called improvement, proposed. main implies improvement occurs spatially-coupled general graphical models.