  This paper presents ExPECA, an edge computing and wireless communication
research testbed designed to tackle two pressing challenges: comprehensive
end-to-end experimentation and high levels of experimental reproducibility.
Leveraging OpenStack-based Chameleon Infrastructure (CHI) framework for its
proven flexibility and ease of operation, ExPECA is located in a unique,
isolated underground facility, providing a highly controlled setting for
wireless experiments. The testbed is engineered to facilitate integrated
studies of both communication and computation, offering a diverse array of
Software-Defined Radios (SDR) and Commercial Off-The-Shelf (COTS) wireless and
wired links, as well as containerized computational environments. We exemplify
the experimental possibilities of the testbed using OpenRTiST, a
latency-sensitive, bandwidth-intensive application, and analyze its
performance. Lastly, we highlight an array of research domains and experimental
setups that stand to gain from ExPECA's features, including closed-loop
applications and time-sensitive networking.
