TY - GEN
T1 - Chance-constrained optimization of uplink parameters for OFDMA cognitive radios
AU - Soltani, Nasim Yahya
AU - Kim, Seung Jun
AU - Giannakis, Georgios B.
PY - 2012
Y1 - 2012
N2 - This paper deals with the resource allocation task for the uplink of OFDMA-based cognitive radio (CR) systems. A weighted sum-rate maximization problem is formulated to optimize the subcarrier assignment as well as the power loading per CR user, while protecting the primary user (PU) systems. Since the CR-to-PU channels may not be accurately acquired, the PU interference constraint is cast as a chance constraint. Consequently, a convex conservative approximation of the chance constraint is employed for tractability reasons. In particular, to mitigate the combinatorial complexity incurred for optimal subcarrier assignment, a separable structure is pursued, and the dual decomposition method is employed to obtain a near-optimal solver. The resultant algorithm is tested via simulated tests.
AB - This paper deals with the resource allocation task for the uplink of OFDMA-based cognitive radio (CR) systems. A weighted sum-rate maximization problem is formulated to optimize the subcarrier assignment as well as the power loading per CR user, while protecting the primary user (PU) systems. Since the CR-to-PU channels may not be accurately acquired, the PU interference constraint is cast as a chance constraint. Consequently, a convex conservative approximation of the chance constraint is employed for tractability reasons. In particular, to mitigate the combinatorial complexity incurred for optimal subcarrier assignment, a separable structure is pursued, and the dual decomposition method is employed to obtain a near-optimal solver. The resultant algorithm is tested via simulated tests.
KW - OFDMA
KW - channel uncertainty
KW - cognitive radios
KW - optimization
KW - resource allocation
UR - http://www.scopus.com/inward/record.url?scp=84867616338&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84867616338&partnerID=8YFLogxK
U2 - 10.1109/ICASSP.2012.6288502
DO - 10.1109/ICASSP.2012.6288502
M3 - Conference contribution
AN - SCOPUS:84867616338
SN - 9781467300469
T3 - ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings
SP - 2813
EP - 2816
BT - 2012 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2012 - Proceedings
T2 - 2012 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2012
Y2 - 25 March 2012 through 30 March 2012
ER -