Title :
Optimal power allocation in OFDM-based cognitive radio systems
Author :
Liu, Jing ; Song, Yantao ; Yang, Shouyi ; Song, Jiayou ; Ning, Bing
Author_Institution :
Sch. of Inf. Eng., Zhengzhou Univ., Zhengzhou, China
Abstract :
In this paper, we investigate the optimal power allocation strategy that aims at maximizing the channel throughput in OFDM-based cognitive radio systems. We introduce power control parameter to adjust the interference threshold license users, we also establish mathematical model based on convex optimization theory, and through matlab simulation, the optimal scheme and equal ladder scheme and average scheme were compared. The results showed that when the cognitive users satisfy interference threshold of license users, it can make the cognitive users´ channel throughput at maximization.
Keywords :
OFDM modulation; cognitive radio; convex programming; power control; radiofrequency interference; telecommunication control; wireless channels; Matlab simulation; OFDM-based cognitive radio system; average scheme; channel throughput; convex optimization theory; interference threshold; ladder scheme; license user; mathematical model; optimal power allocation; power control parameter; Bit error rate; Lagrangian functions; OFDM; cognitive radio; convex optimization; power allocation; power control;
Conference_Titel :
Cross Strait Quad-Regional Radio Science and Wireless Technology Conference (CSQRWC), 2011
Conference_Location :
Harbin
Print_ISBN :
978-1-4244-9792-8
DOI :
10.1109/CSQRWC.2011.6037095
