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    National Tsing Hua University Institutional Repository > 電機資訊學院 > 電機工程學系 > 會議論文  >  Joint subcarrier and power allocation in multiuser OFDM-based cognitive radio systems

    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/67956

    Title: Joint subcarrier and power allocation in multiuser OFDM-based cognitive radio systems
    Authors: Chiuan-Hsu Chen;Chin-Liang Wang
    教師: 王晉良
    Date: 2010
    Publisher: Institute of Electrical and Electronics Engineers
    Relation: Proceedings of the 2010 IEEE International Conference on Communications (ICC 2010), Cape Town, South Africa, 23-27 May 2010, Pages 1-5
    Keywords: subcarrier
    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.
    Relation Link: http://www.ieee.org/
    URI: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/67956
    Appears in Collections:[電機工程學系] 會議論文

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