Zhang Ran-ran, Liu Si-yang, Xie Gang, Liu Yuan-an. Spectrum Sharing Algorithm for Downlink Cognitive Radio Systems[J]. Journal of Electronics & Information Technology, 2009, 31(5): 1086-1089. doi: 10.3724/SP.J.1146.2008.00300
Citation:
Zhang Ran-ran, Liu Si-yang, Xie Gang, Liu Yuan-an. Spectrum Sharing Algorithm for Downlink Cognitive Radio Systems[J]. Journal of Electronics & Information Technology, 2009, 31(5): 1086-1089. doi: 10.3724/SP.J.1146.2008.00300
Zhang Ran-ran, Liu Si-yang, Xie Gang, Liu Yuan-an. Spectrum Sharing Algorithm for Downlink Cognitive Radio Systems[J]. Journal of Electronics & Information Technology, 2009, 31(5): 1086-1089. doi: 10.3724/SP.J.1146.2008.00300
Citation:
Zhang Ran-ran, Liu Si-yang, Xie Gang, Liu Yuan-an. Spectrum Sharing Algorithm for Downlink Cognitive Radio Systems[J]. Journal of Electronics & Information Technology, 2009, 31(5): 1086-1089. doi: 10.3724/SP.J.1146.2008.00300
A spectrum sharing algorithm for downlink cognitive radio systems is proposed to maximize the system capacity under total transmission power and interference constraints. Interference to the licensed users is analyzed, and a method to set interference constraint is given accordingly. Based on the interference constraint, the maximum system capacity is achieved by two steps: first the optimal subcarrier allocation is derived by the maximum channel signal to interference plus noise ratio rule; then transmission power is optimally allocated by the proposed double water-filling method. Simulation results show this algorithm can provide significant capacity gain comparing with the conventional spectrum sharing algorithms.
Mitola J and Maguire G Q. Cognitive radio: making softwareradios more personal[J]. IEEE Wireless Communications,1999, 6(4): 13-18.[2]Mody A N, Blatt S R, and Mills D G. Recent advances incognitive communications[J]. IEEE CommunicationsMagazine, 2007, 45(10): 54-61.[3]廖楚林, 陈劼, 唐友喜, 等. 认知无线电中的并行频谱分配算法[J].电子与信息学, 2007, 29(7): 1608-1611.Liao Chu-lin, Chen Jie, and Tang You-xi, et al.. Parallelalgorithm of spectrum allocation in cognitive radio[J].Journal of Electronics Information Technology, 2007, 29(7):1608-1611.[4]Zhao Qing and Sadler B M. A survey of dynamic spectrumaccess[J].IEEE Signal Processing Magazine.2007, 24(3):79-89[5]吴伟陵, 牛凯. 移动通信原理[M]. 北京: 电子工业出版社,2005: 14-15.Wu Wei-ling and Niu Kai. Mobile Communications Principle[M]. Beijing: Publishing House of Electronics Industry, 2005:14-15.[6]Jang J and Lee K B. Transmit power adaptation formultiuser OFDM systems[J].IEEE Journal on Selected Areasin Communications.2003, 21(2):171-178[7]Boyd S and Vandenberghe L. Convex Optimization[M].Cambridge, Cambridge University Press, 2004: 241-249.[8]Telatar E. Capacity of multi-antenna Gaussian channels[J].European Transactions. on Telecommunications.1999, 10(6):585-595