Fluid antenna systems have at most K*=2⌈W⌉+1 significant independent eigenmodes set by aperture size W, enabling EDoF and WIM closed-form outage approximations that match exact diversity order and never underestimate performance.
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The work derives approximate outage probability expressions for Rician channels in SIM-assisted HAPS networks and optimizes energy efficiency via alternating optimization and unsupervised DNN methods for joint transmit power and phase-shift control.
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How Many Independent Modes Does a Fluid Antenna Have? A Closed-Form Outage Analysis via Equivalent Degrees of Freedom
Fluid antenna systems have at most K*=2⌈W⌉+1 significant independent eigenmodes set by aperture size W, enabling EDoF and WIM closed-form outage approximations that match exact diversity order and never underestimate performance.
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Simultaneous Unicast and Multicast Transmissions in Stacked Intelligent Metasurfaces-assisted HAPS Wireless Networks: Performance Analysis and Optimization
The work derives approximate outage probability expressions for Rician channels in SIM-assisted HAPS networks and optimizes energy efficiency via alternating optimization and unsupervised DNN methods for joint transmit power and phase-shift control.