  We investigate the impact of fading correlation on the performance of the
doubly dirty fading multiple access channel (MAC) with non-causally known side
information at transmitters. Using Copula theory, we derive closed-form
expressions for the outage probability and the coverage region under arbitrary
dependence conditions. We show that a positive dependence structure between the
fading channel coefficients is beneficial for the system performance, as it
improves the outage probability and extends the coverage region compared to the
case of independent fading. Conversely, a negative dependence structure has a
detrimental effect on both performance metrics.
