Fluid Antenna-Assisted Dirty Multiple Access Channels Over Composite Fading

• Published in: IEEE communications letters Vol. 28; no. 2; pp. 382 - 386
• Main Authors: Rostami Ghadi, Farshad, Wong, Kai-Kit, Lopez-Martinez, F. Javier, Chae, Chan-Byoung, Tong, Kin-Fai, Zhang, Yangyang
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.02.2024; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Antennas; Channels; Communications systems; copula theory; Correlation; Correlation coefficient; Correlation coefficients; Electronic mail; Fading; Fading channels; Fisher-snedecor F fading; Fluid antenna; Interference; Multiple access; multiple access channel; outage probability; Performance analysis; Receivers & amplifiers; Signal to noise ratio; Transmitters
• ISSN: 1089-7798; 1558-2558
• DOI: 10.1109/LCOMM.2023.3344296

This letter investigates the application of the emerging fluid antenna (FA) technology in multiuser communication systems when side information (SI) is known at the transmitters. We consider a <inline-formula> <tex-math notation="LaTeX">K </tex-math></inline-formula>-user dirty multiple access channel (DMAC) with non-causally known SI at the transmitters, where <inline-formula> <tex-math notation="LaTeX">K </tex-math></inline-formula> users send independent messages to a common receiver with a FA capable of changing its location depending on the channel condition. By connecting Jakes' model to copula theory through Spearman's <inline-formula> <tex-math notation="LaTeX">\rho </tex-math></inline-formula> rank correlation coefficient, we accurately describe the spatial correlation between the FA channels, and derive a closed-form expression for the outage probability (OP) under Fisher-Snedecor <inline-formula> <tex-math notation="LaTeX">\mathcal {F} </tex-math></inline-formula> fading. Results confirm that a FA-aided receiver can achieve better performance in multiuser communication: (<inline-formula> <tex-math notation="LaTeX">{i} </tex-math></inline-formula>) increasing the number of FA ports as well as FA size can significantly lower the OP; (ii) FA can support a large number of users using only one FA at the common receiver in a few wavelengths of space.