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Energy Efficient Power Allocation for OFDM-Based Cognitive Radio Systems with Partial Intersystem CSI
This paper investigates energy efficient
power allocation for orthogonal frequency division multiplexing- (OFDM-) based cognitive radio (CR) systems
with partial intersystem channel state information (CSI)
available. The goal is to maximize energy efficiency
(EE) while ensuring the minimum rate of secondary
user (SU) and keeping the average interference power
(AIP) introduced to primary user (PU) within a target
probability level. We propose a suboptimal algorithm
to solve this optimization problem based on classic
water-filling (WF) technique. Moreover, we first address
the relation between EE and water level. In
order to reduce complexity, a simplified algorithm with
closed-form solution is also proposed. Numerical results
are provided to corroborate our theoretical analysis
and to demonstrate the effectiveness of the proposed
schemes