Institute of Electrical and Electronics Engineers Inc.;New York, NY: IEEE
摘要:
摘要： A gradient-based method is designed for power allocation in orthogonal-frequency-division-multiplexing (OFDM) -based cognitive radio networks. The resource allocation problem subject to a mutual interference constraint is considered. We utilize the gradient descent approach to allocate power to subcarriers in cognitive radio (CR) networks. The proposed gradient-based power allocation method with a well-designed step size can approximate the optimal solution within a few iterations. Due to the derived equation for power allocation in an adaptive manner, the proposed method is feasible for adaptive power allocation in time-varying channels. The analysis for the selection of the step size is presented in this paper. For comparison purposes, a greedy power-loading method requiring numerous iterations is also designed for this power allocation problem. The proposed gradient-based method and the greedy power-loading method both have a computational complexity of O(N), but the proposed gradient-based method requires far fewer iterations. As demonstrated in the simulation results, the proposed gradient-based method with the adaptive step size has a fast rate to achieve a near-optimal solution within an extremely small number of iterations and has quite a low computational complexity of O(N). 其他題名： TVT 出版者： New York, NY: IEEE 出版日期： 2014-02-01 出處： IEEE Transactions on Vehicular Technology, 2014-02, Vol.63 (2), p.836-848 資源來源： IEEE Xplore 版權： 2015 INIST-CNRS 版權： Copyright The Institute of Electrical and Electronics Engineers, Inc. (IEEE) Feb 2014 識別號： ISSN: 0018-9545 識別號： EISSN: 1939-9359 識別號： DOI: 10.1109/TVT.2013.2272804 識別號： CODEN: ITVTAB
