English Abstract
Abstract:
The reconfigurable intelligent surfaces (RIS) is a new technology that can be utilized to
provide security to vehicle-to-vehicle (V2V) communications at the physical layer. In this paper,
we achieve a higher key generation rate for V2V communications at lower cost and computational
complexity. We investigate the use of a passive RIS as a relay, to introduce channel diversity and
increase the key generation rate (KGR), accordingly. In this regard, we consider the subsets of
consecutive reflecting elements instead of the RIS as a whole in a time slot, i.e., instead of a single
reflector, the subsets of reflectors are utilized to redirect the signal to the receiver via passive beam
forming. Simulations are conducted for different sizes of RISs and subsets of reflectors per RIS. From
the results obtained, it can be seen that when we consider a subset of reflectors instead of the RIS
as a single entity, it becomes increasingly difficult to intercept the signal at the eavesdropper. In the
proposed scheme, the KGR reaches up to 6 bps per time slot.
