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- W2302567804 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. Keywords-cognitive radio, orthogonal frequency division multiplexing, water-filling algorithm, power allocation." @default.
- W2302567804 created "2016-06-24" @default.
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- W2302567804 date "2012-01-01" @default.
- W2302567804 modified "2023-09-23" @default.
- W2302567804 title "An Efficient Water-Filling Algorithm for PowerAllocation in OFDM-Based Cognitive RadioSystems" @default.
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