Subcarrier and Power allocation in OFDM Based Cognitive Radio Systems
Cognitive Radio (CR) which aims to improve the spectrum utilization by accessing opportunistically the spectrum originally licensed to a primary system is a promising concept OFDM is regarded as a potential technology for CR systems and dynamic resource allocation is an important task in such systems. This paper focuses on the subcarrier and power allocation algorithms which are to maximize secondary users transmitted data rate while adjusting the interference introduced to the PIT band below a threshold and maintaining the total power under a limit. The issue of subcarrier allocation in multiuser CR networks is firstly discussed. Secondly, three suboptimal power allocation algorithms based on LWF (linear water-filling algorithm) which have less complexity than the optimal algorithm are proposed. Simulation results show that the power interference algorithm based on linear water-filling scheme (LWFPI) offers the best performance among the suboptimal power allocation algorithms, which is the closest to the optimal scheme.
Cognitive Radio OFDM Power AUocation Linear water-filling
Wu Jian Yang Longxiang Liu Xu
Wireless Communications Key Lab of Jiangsu Province, Nanjing University of Posts and Telecommunications, Nanjing,Jiangsu, P. R. China, 210003 Wideband Wireless Communications and Sensor Networks Technology Lab, Ministry of Education of China, Nanjing,Jiangsu, P. R. China, 210013
国际会议
深圳
英文
728-731
2011-03-28（万方平台首次上网日期，不代表论文的发表时间）