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In this paper we consider the achievable rate region of the Gaussian MultipleAccess Channel (MAC) when suboptimal transmission schemes are employed.Focusing on the two-user MAC and assuming uncoded Pulse Amplitude Modulation(PAM), we derive a rate region that is a pentagon, and propose a strategy withwhich it can be achieved. We also compare the region with outer bounds and withorthogonal transmission.

Achievable rates for transmission of discrete constellations over the Gaussian MAC channe