  In this paper, we consider a mesh-structured unmanned aerial vehicle (UAV)
networks exploiting partially overlapping channels (POCs). For general
data-collection tasks in UAV networks, we aim to optimize the network
throughput with constraints on transmission power and quality of service (QoS).
As far as the highly mobile and constantly changing UAV networks are concerned,
unfortunately, most existing methods rely on definite information which is
vulnerable to the dynamic environment, rendering system performance to be less
effective. In order to combat dynamic topology and varying interference of UAV
networks, a robust and distributed learning scheme is proposed. Rather than the
perfect channel state information (CSI), we introduce uncertainties to
characterize the dynamic channel gains among UAV nodes, which are then
interpreted with fuzzy numbers. Instead of the traditional observation space
where the channel capacity is a crisp reward, we implement the learning and
decision process in a mapped fuzzy space. This allows the system to achieve a
smoother and more robust performance by optimizing in an alternate space. To
this end, we design a fuzzy payoffs function (FPF) to describe the fluctuated
utility, and the problem of POCs assignment is formulated as a fuzzy payoffs
game (FPG). Assisted by an attractive property of fuzzy bi-matrix games, the
existence of fuzzy Nash equilibrium (FNE) for our formulated FPG is proved. Our
robust fuzzy-learning algorithm could reach the equilibrium solution via a
least-deviation method. Finally, numerical simulations are provided to
demonstrate the advantages of our new scheme over the existing scheme.
