Title :
A General Power Allocation Algorithm for OFDM-Based Cognitive Radio Systems
Author :
Wang, Peng ; Zhong, Xiaofeng ; Xiao, Limin ; Zhou, Shidong ; Wang, Jing
Author_Institution :
Dept. of Electron. Eng., Tsinghua Univ., Beijing, China
Abstract :
In OFDM-based cognitive radio systems, the interference power limits of the primary users (PUs) introduce subchannel transmit power constraints for the secondary user (SU). The power allocation among the subcarriers of SU should be subject to both the sum transmit power constraint as well as the transmit power constraint of each subchannel. Different from previous works, we deal with a more general case where the subcarrier sidelobes are specially considered. A general power allocation algorithm is proposed to obtain the optimal solution that maximizes the capacity while satisfying both the sum and subchannel transmit power constraints.
Keywords :
OFDM modulation; channel allocation; cognitive radio; OFDM-based cognitive radio system; orthogonal frequency division multiplexing system; power allocation algorithm; subchannel transmit power constraint; Cognitive radio; Digital communication; Information science; Interference constraints; Iterative algorithms; Laboratories; Microwave technology; OFDM; Partitioning algorithms; Power engineering and energy;
Conference_Titel :
Communications Workshops, 2009. ICC Workshops 2009. IEEE International Conference on
Conference_Location :
Dresden
Print_ISBN :
978-1-4244-3437-4
DOI :
10.1109/ICCW.2009.5208055
