Abstract:
Autonomous Vehicles (AVs) rely on a set of radar
sensors operated on frequency modulated waveforms. Due to the
large bandwidth requirement of frequency modulated radars,
only a limited number of proximate vehicles can be allowed
for a concurrent transmission within the available spectrum.
However, with the explosive growth of AVs, the available spectrum may soon reach its capacity. As a results, the coexistence
of multiple AVs working on same resource, may lead to the
problem of Radar-to-Radar (R2R) interference, also known
as radar blindness. In this paper, we propose the notion of
coded waveforms to minimize the R2R interference among the
vehicles operating on the same resource. Specifically, the spread
spectrum codes have been used as another degree of freedom (i.e., along with time-frequency resources) to spread the
inter-vehicular radar interference over the wider spectrum, which
enable to orthogonalize more number of AVs over the available
range of spectrum. In addition, we have formulated a Spread
Spectrum-based Radar Transmission Scheme (SS-RTS), and
described the transmission and reception through SS-RTS. Also,
the SS-RTS has been compared with the existing Graph-based
Resource Allocation (GRA) scheme. Further, simulation results
verified that SS-RTS significantly reduces the inter-vehicular R2R
interference and outperforms GRA in terms of blind probability.
