Coupling Information Transmission with an Approximate Message Passing Receiver

Abstract

Spatial graph coupling has been immensely successful in the field of error correcting codes. Motivated by this success the coupling approach has been implemented for more general communication formats, including multiple-access communications. We explore the application of spatial coupling to modulation of data streams, and employ a recently proposed approximate message passing compressed sensing technique to develop an algorithm for the demodulation of datastreams transmitted over the multiple-access additive white Gaussian noise channel and demonstrate that near-optimal sum-rate performance can be achieved.