Title :
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
fDate :
5/1/2012 12:00:00 AM
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;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2012.031212.120228
