Factor Graph Based Joint Detection/Decoding for LDPC Coded Large-MIMO Systems
In this paper, the authors employ message passing algorithms over graphical models to jointly detect and decode symbols transmitted over large Multiple-Input Multiple-Output (MIMO) channels with Low Density Parity Check (LDPC) coded bits. They adopt a factor graph based technique to integrate the detection and decoding operations. A Gaussian approximation of spatial interference is used for detection. This serves as a low complexity joint detection/decoding approach for large dimensional MIMO systems coded with LDPC codes of large block lengths. This joint processing achieves significantly better performance than the individual detection and decoding scheme.