  We study medium access in FMCW radar networks. We assume that all the radars
use same parameters, e.g., chirp duration, chirp slope, cutoff frequency,
number of chirps per packet, etc, and propose and analyze slotted ALOHA and
CSMA protocols to mitigate narrowband interference. We define a notion of
throughput to quantify the performance of the proposed protocols. In the case
of ALOHA, we analyze interference probability and throughput as functions of
the system parameters. We observe that interference probability and throughput
may behave differently than in wireless communication networks. For instance,
if the number of chirps per packet is larger than one, the interference
probabilities may be smaller for higher transmission rates. We define a medium
sensing procedure, referred to as clear channel assessment (CCA), as a part of
the proposed CSMA, and also define CCA success and failure events. In CSMA, the
radars transmit only after a successful CCA. We study, CCA success probability,
interference probability and throughput as functions of the system parameters.
We observe that, unlike wireless communication networks, using the highest
possible attempt rates may maximize throughput in few network scenarios. We
perform an extensive simulation to verify our analytical results and to compare
slotted ALOHA and CSMA. We observe that CSMA outperforms ALOHA in all realistic
scenarios.
