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In this paper, we consider a two-user multiple access fading channel underquality-of-service (QoS) constraints. We initially formulate the transmissionrates for both transmitters, where the transmitters have arbitrarilydistributed input signals. We assume that the receiver performs successivedecoding with a certain order. Then, we establish the effective capacity regionthat provides the maximum allowable sustainable arrival rate region at thetransmitters' buffers under QoS guarantees. Assuming limited transmission powerbudgets at the transmitters, we attain the power allocation policies thatmaximize the effective capacity region. As for the decoding order at thereceiver, we characterize the optimal decoding order regions in the plane ofchannel fading parameters for given power allocation policies. In order toaccomplish the aforementioned objectives, we make use of the relationshipbetween the minimum mean square error and the first derivative of the mutualinformation with respect to the power allocation policies. Through numericalresults, we display the impact of input signal distributions on the effectivecapacity region performance of this two-user multiple access fading channel.

Effective Capacity in Multiple Access Channels with Arbitrary Inputs