A broadcast approach for the multiple-access slow fading channel

A `single-user´ based broadcast approach is adapted for the multiple access very slow fading channel. This strategy facilitates one to adapt the reliably conveyed rate to the actual channel conditions experienced by each of the users without having any feedback links to the transmitters. This strategy implements simultaneously a continuum of capacity regions vs. outage pairs rather than a single value as is the case in the standard approach. We address specifically expected rates and outages, which are compared to ergodic capacities and also the capacity vs. outage. The main results presented and demonstrated for the two-user independent Rayleigh faded channel, are extended to the general multiple access slowly fading channel