Achieving AWGN Multiple Access Channel Capacity with Spatial Graph Coupling

Author

Truhachev, Dmitri

Author_Institution

Dept. of Comput. Sci., Univ. of Alberta, Edmonton, AB, Canada

Volume

16

Issue

5

fYear

2012

fDate

5/1/2012 12:00:00 AM

Firstpage

585

Lastpage

588

Abstract

Communication over a multiple access channel is considered. Each user modulates his signal as a superposition of redundant data streams where interconnection of data bits can be represented by means of a sparse graph. The receiver observes a signal resulting from the coupling of the sparse modulation graphs. Iterative interference cancellation decoding is analyzed. It is proved that spatial graph coupling allows to achieve the AWGN channel capacity with equal power and rate transmissions.

Keywords

AWGN channels; channel capacity; channel coding; graph theory; interference suppression; iterative decoding; modulation coding; multi-access systems; AWGN multiple access channel capacity; data bit interconnection; equal power transmission; iterative interference cancellation decoding; rate transmissions; receiver; redundant data stream superposition; sparse modulation graph coupling; spatial graph coupling; AWGN channels; Channel capacity; Couplings; Interference; Iterative decoding; Receivers; Signal to noise ratio; Spatial coupling; capacity; interference cancellation; multiple access channel;

fLanguage

English

Journal_Title

Communications Letters, IEEE

Publisher

ieee

ISSN

1089-7798

Type

jour

DOI

10.1109/LCOMM.2012.031212.120228

Filename

6171810