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- W2117313340 abstract "This paper presents a joint subcarrier and power allocation algorithm for multiuser orthogonal frequency division multiplexing (MU-OFDM) cognitive radio (CR) systems, where the peak power constraint is used to protect the primary user. We first derive a rule for subcarrier allocation to maximize the sum capacity for a given power distribution. With this rule, we form a joint subcarrier and power allocation algorithm in which the sum capacity optimization can be alternated between the subcarrier and power. To simplify the high-complexity optimal power allocation algorithm (i.e., the iterative partitioned water-filling algorithm) for the joint scheme, we develop a simple method for updating the water level when each subcarrier is allocated to a secondary user. Simulation results show that using the proposed low-complexity method to update the water level achieves a system capacity close to that of the joint subcarrier and power allocation algorithm with optimal power distribution." @default.
- W2117313340 created "2016-06-24" @default.
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- W2117313340 date "2010-05-01" @default.
- W2117313340 modified "2023-09-24" @default.
- W2117313340 title "Joint Subcarrier and Power Allocation in Multiuser OFDM-Based Cognitive Radio Systems" @default.
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- W2117313340 doi "https://doi.org/10.1109/icc.2010.5501810" @default.
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