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This letter investigates the application of the emerging fluid antenna (FA)technology in multiuser communication systems when side information (SI) isavailable at the transmitters. In particular, we consider a K-user dirtymultiple access channel (DMAC) with non-causally known SI at the transmitters,where K users send independent messages to a common receiver with a FA capableof changing its location depending on the channel condition. By connectingJakes' model to copula theory through Spearman's {\rho} rank correlationcoefficient, we accurately describe the spatial correlation between the FAchannels, and derive a closed-form expression for the outage probability (OP)under Fisher-Snedecor F fading. Numerical results illustrate how considering FAcan improve the performance of multiuser communication systems in terms of theOP and also support a large number of users using only one FA at the commonreceiver in a few wavelengths of space.

Fluid Antenna-Assisted Dirty Multiple Access Channels over Composite Fading