Improvement of BP-Based CDMA Multiuser Detection by Spatial Coupling

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.

accepted for presentation at ISIT2011

References in corpus (2)

• Analysis of CDMA systems that are characterized by eigenvalue spectrum
• Asymptotic Analysis of General Multiuser Detectors in MIMO DS-CDMA Channels

Cited by in corpus (6)

• Statistical physics of inference: Thresholds and algorithms
• Spatially Coupled LDPC Codes Constructed from Protographs
• Wave-Like Solutions of General One-Dimensional Spatially Coupled Systems
• Connecting Spatially Coupled LDPC Code Chains
• Iterative LMMSE Channel Estimation, Multiuser Detection, and Decoding via Spatial Coupling
• Iterative Multiuser Detection and Decoding with Spatially Coupled Interleaving