The previous chapters have discussed the canvas of joint radar-communications
(JRC), highlighting the key approaches of radar-centric, communications-centric
and dual-function radar-communications systems. Several signal processing and
related aspects enabling these approaches including waveform design, resource
allocation, privacy and security, and intelligent surfaces have been elaborated
in detail. These topics offer comprehensive theoretical guarantees and
algorithms. However, they are largely based on theoretical models. A hardware
validation of these techniques would lend credence to the results while
enabling their embrace by industry. To this end, this chapter presents some of
the prototyping initiatives that address some salient aspects of JRC. We
describe some existing prototypes to highlight the challenges in design and
performance of JRC. We conclude by presenting some avenues that require
prototyping support in the future.Comment: Book chapter, 54 pages, 13 figures, 10 table