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In this paper we show how a graph-based systemcan be designed for an N-FSK T-user multiple access channel withnoise. The channel is a frequency selective fast fading channelwith additive white Gaussian Noise. The system does not knowor attempt to determine the fading incurred at a given moment.The system is composed of a multiuser detector and T differentRepeat-Accumulate (RA) decoders. The decoders are optimizedas a set and consequently have the same parameters. A structuralvariation between the users’ encoders/decoders is sufcient toallow for multiple access and channel error correction, whileproviding rates close to channel capacity.

EXIT chart optimization of Repeat-Accumulate codes for an N-Frequency T-User Multiple Access Channel with noise