Title :
Subcarrier allocation and relay selection for uplink transmission in OFDMA-based cognitive radio systems
Author :
Do-Haeng Lee ; Won Hyoung Lee ; Eol Choi ; Ho Young Hwang
Author_Institution :
Dept. of Comput. Eng., Kwangwoon Univ., Seoul, South Korea
Abstract :
In this paper, we study subcarrier allocation and relay selection for uplink transmission in OFDMA-based cognitive radio (CR) systems. We formulate optimization problems to maximize total uplink throughput of secondary users (SUs) in OFDMA-based CR systems. Then, we propose link quality-based (LQB) scheme and minimum interference-based (MIB) scheme, and simulate the proposed schemes with two given environments. The simulation results show that the performance of MIB scheme is better than that of LQB scheme when the constraint for received interference power from SUs at primary receiver is dominant.
Keywords :
OFDM modulation; cognitive radio; frequency division multiple access; optimisation; radio receivers; radiofrequency interference; resource allocation; LQB scheme; MIB scheme; OFDMA; cognitive radio systems; link quality-based scheme; minimum interference-based scheme; optimization problems; primary receiver; received interference power; relay selection; secondary users; subcarrier allocation; uplink transmission;
Conference_Titel :
ICT Convergence (ICTC), 2013 International Conference on
Conference_Location :
Jeju
DOI :
10.1109/ICTC.2013.6675402
