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Communication over a Gaussian multiple access channel (GMAC) is considered. Each user modulates his data as a superposition of redundant data streams. The interconnection of the modulated data symbols can be described by means of a sparse graph. The transmitted modulation graphs couple at the receiver, which performs joint detection based on iterative interference cancellation. We prove that the GMAC capacity can be achieved by such a system even for the case when all the users access the channel with equal power and transmit with equal rate.
Information Theory and Applications Workshop (ITA), 2012
Date of Conference: 5-10 Feb. 2012