2 research outputs found
An access technique for secondary network in downlink channels
In this paper, we present an access scheme which
exploits the duplexing structure of licensed networks. It uses
uplink sensing information to transmit in a downlink channel.
In essence, this scheme decouples the sensing slot(or channel)
from the access slot (or channel) in the secondary network and
so avoids the sensing-throughput tradeoff. Considering pathloss
and shadow fading with a certain degree of correlation between
the sensing and transmission paths, we develop expressions for
the interference power CDF. In addition, we derive the outage
probabilities of both the primary and the secondary users. The
results show that for a given primary user outage constraint, the
secondary network can increase its power proportionally to the
degree of correlation between secondary sensing and transmission
paths. However, as pathloss becomes dominant (large primary
user to secondary user distances) the sensing errors increase
and the primary user outage probability behaves more like
independent fading. The results indicate that this scheme is
applicable to applications in which the intended secondary
network range is less than 100m. All the numerical results are
supported by monte-carlo simulations