This paper considers a new
power strategy and channel allocation
optimization for secondary users (SUs) in
an OFDM based cognitive radio networ
k
where the coverage area of the secondary
network is divided into an Overlay
Region and a Hybrid Region. SUs in the
Overlay Region can adopt the overlay
spectrum access method while SUs in the
Hybrid Region may adopt underlay or
sensing free spectrum acce
ss. We first
present a general resource allocation
framework that optimizes the power and
channel allocation to secondary users who
adopt these different spectrum access
methods depending on their locations. In
order to enable sensing free spectrum
access,
we then propose a new algorithm
that
incorporates
an
interference
violation test to decide the parameters in
the general framework. The proposed
scheme intelligently utilizes frequency
and
space
opportunities,
avoids
unnecessary
spectrum
sensing
and
minim
izes the overall power consumption
while maintaining the quality of service of
a primary system. Simulation results
validate the effectiveness of the proposed
method in terms of energy efficiency and
show that enhanced performance can be
obtained
by
utiliz
ing
spatial
opportunities.
Real Time Impact Factor:
Pending
Author Name: Samala Mamatha , Bangari Jaya
URL: View PDF
Keywords: Cognitive radio, energy efficiency, resource allocation, location - aware strategy, OFDM.
ISSN: 2581-4621
EISSN: 2581-4621
EOI/DOI:
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