Unmanned aerial vehicles (UAVs) are widely exploited in environment monitoring, search-
and-rescue, etc. However, the mobility and short flight duration of UAVs bring challenges for …

In conventional cognitive radio ad hoc networks, both primary users (PUs) and secondary
users (SUs) are typically equipped with omni-directional antennas, which can cause high …

In cognitive radio ad hoc networks, omni-directional antennas are typically used at both
primary users (PUs) and secondary users (SUs), which can cause high interference. We …

Due to the spatial–temporal spectrum mobility in cognitive radio ad-hoc networks
(CRAHNs), multi-hop communication paths among secondary users have to detour or even …

In this paper, we investigate the angle-domain spectrum opportunities of secondary users
with directional transmission, and analyze the detection probability of spectrum holes. We …

In cognitive radio (CR) networks, channel rendezvous is a significant operation for two
secondary users (SUs) to find a common available channel and establish a link between …

Cognitive radio is the next-era wi-fi verbal exchange gadget that allows unlicensed or
secondary users (SUs) to discover and use underutilized certified spectrum (or white …