Abstract:
In this paper, considering multiple primary users in a
cognitive radio network, the problem of optimal power
allocation strategy is studied to maximize the capacity of
the secondary system. The primary users are each licensed
to an adjacent narrowband channel and the secondary
users simultaneously sense multiple narrow band channels
and aggregate them for transmission. The sensing based
spectrum sharing scheme where the secondary transmitter
sense and then transmit is considered and the system
model with multiple primary users is proposed. An
algorithm using Lagrange dual decomposition method is
proposed to solve the problem subject to average
interference constraint and average transmit power
constraint of secondary user. The optimization of power
for maximizing the outage capacity is also studied and
both are compared with opportunistic spectrum access
scheme. Simulation results show that the proposed system
maximizes the channel capacity of the secondary user of
Cognitive network.
