caa a22 4500 445296879 CHVBK 20180317142544.0 cr unu---uuuuu 170323e20100801xx s 000 0 eng 10.1007/s12243-009-0140-z doi (NATIONALLICENCE)springer-10.1007/s12243-009-0140-z Mutual interference considered power allocation in OFDM-based cognitive networks: the multiple SUs case [Elektronische Daten] [Chengshi Zhao, Mingrui Zou, Kyungsup Kwak] Power allocation for secondary users (SUs) in cognitive networks is an important issue to ensure the SUs' quality of service. When the mutual interference between the primary users (PUs) and the SUs is taken into consideration, it is wanted to achieve the conflict-free power allocation while synchronously maximizing the capacity of the secondary network. In this paper, the optimal power allocation problem is considered in orthogonal frequency division multiplexing cognitive networks. The single SU case is primarily formulated as a constrained optimization problem. On this basis, the multiple SUs case is then studied and simulated in detail. During the analysis, the mutual interference among the PUs and the SUs is comprehensively formulated as the restrictions on the SU's transmission power and the optimization problems are finally resolved by iterative water-filling algorithms. Consequently, the proposed power allocation scheme restrains the interference to the primary network, as well as maximizing the capacity of the secondary network. Specifying the multiple-SUs case, simulation results are exhibited in a simplified scenario to confirm the efficiency of the proposed water-filling algorithm, and the influence of the mutual interference on the power allocation and the system capacity is further illustrated. Institut TELECOM and Springer-Verlag, 2009 Cognitive radio nationallicence Power allocation nationallicence Water-filling nationallicence OFDM nationallicence Zhao Chengshi Telecommunications Engineering Lab, Graduate School of IT and Telecom., Inha University, 253 YongHyun-Dong, Nam-Gu, 402-751, Incheon, Republic of Korea aut Zou Mingrui Telecommunications Engineering Lab, Graduate School of IT and Telecom., Inha University, 253 YongHyun-Dong, Nam-Gu, 402-751, Incheon, Republic of Korea aut Kwak Kyungsup Telecommunications Engineering Lab, Graduate School of IT and Telecom., Inha University, 253 YongHyun-Dong, Nam-Gu, 402-751, Incheon, Republic of Korea aut annals of telecommunications - annales des télécommunications Springer-Verlag 65/7-8(2010-08-01), 341-351 0003-4347 65:7-8<341 2010 65 12243 https://doi.org/10.1007/s12243-009-0140-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12243-009-0140-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Zhao Chengshi Telecommunications Engineering Lab, Graduate School of IT and Telecom., Inha University, 253 YongHyun-Dong, Nam-Gu, 402-751, Incheon, Republic of Korea aut NATIONALLICENCE 700 1- Zou Mingrui Telecommunications Engineering Lab, Graduate School of IT and Telecom., Inha University, 253 YongHyun-Dong, Nam-Gu, 402-751, Incheon, Republic of Korea aut NATIONALLICENCE 700 1- Kwak Kyungsup Telecommunications Engineering Lab, Graduate School of IT and Telecom., Inha University, 253 YongHyun-Dong, Nam-Gu, 402-751, Incheon, Republic of Korea aut NATIONALLICENCE 773 0- annals of telecommunications - annales des télécommunications Springer-Verlag 65/7-8(2010-08-01), 341-351 0003-4347 65:7-8<341 2010 65 12243 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer