Computing, School of
School of Computing: Conference and Workshop Papers
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Date of this Version
2012
Document Type
Article
Citation
2012 International Conference on Systems and Informatics (ICSAI 2012); Digital Object Identifier: 10.1109/ICSAI.2012.6223460
Abstract
In this paper, we present a new water-filling algorithm for power allocation in Orthogonal Frequency Division Multiplexing (OFDM) – based cognitive radio systems. The conventional water-filling algorithm cannot be directly employed for power allocation in a cognitive radio system, because there are more power constraints in the cognitive radio power allocation problem than in the classic OFDM system. In this paper, a novel algorithm based on iterative water-filling is presented to overcome such limitations. However, the computational complexity in iterative water-filling is very high. Thus, we explore features of the water-filling algorithm and propose a low-complexity algorithm using power-increment or power-decrement water-filling processes. Simulation results show that our proposed algorithms can achieve the optimal power allocation performance in less time than the iterative water-filling algorithms.
Comments
Copyright 2011 IEEE