Improvement of BP-Based CDMA Multiuser Detection by Spatial Coupling
Information Theory
2011-04-21 v3 math.IT
Abstract
Kudekar et al. proved that the belief-propagation (BP) threshold for low-density parity-check codes can be boosted up to the maximum-a-posteriori (MAP) threshold by spatial coupling. In this paper, spatial coupling is applied to randomly-spread code-division multiple-access (CDMA) systems in order to improve the performance of BP-based multiuser detection (MUD). Spatially-coupled CDMA systems can be regarded as multi-code CDMA systems with two transmission phases. The large-system analysis shows that spatial coupling can improve the BP performance, while there is a gap between the BP performance and the individually-optimal (IO) performance.
Cite
@article{arxiv.1102.3061,
title = {Improvement of BP-Based CDMA Multiuser Detection by Spatial Coupling},
author = {Keigo Takeuchi and Toshiyuki Tanaka and Tsutomu Kawabata},
journal= {arXiv preprint arXiv:1102.3061},
year = {2011}
}
Comments
accepted for presentation at ISIT2011