Secure Low-Latency Millimeter-Wave Wireless Links Through Space-Time Modulation

Physical layer security is gaining a significant prominence, offering a robust alternative to encryption-based methods for emerging 5G/6G wireless networks. It has the potential to not only supplement but also potentially supplant encryption thus enabling secure, high-speed, and low-latency wireless communication. Physical layer security capitalizes on leveraging the inherent features of the wireless channel, such as noise, interference, fading, spatial diversity, and other physical channel conditions to guarantee successful data decoding for authorized users while thwarting eavesdropping attempts [1], [2]. In this at-tempt, we showcase demonstration of spatio-temporal modulation techniques to achieve physical layer security at millimeter-Wave frequencies. This invited article will present two such related works, the first one operating as a 4-element 71–76 GHz space-time transmitter array and the second work is a 3×2 element 57–64 GHz space-time reflector array [3], [4]. In both these work we present and discuss the ability of these arrays to securely establish wireless links to intended receivers in space while garbling the data-constellation elsewhere.