TY - GEN
T1 - Resource allocation for OFDMA cognitive radios under channel uncertainty
AU - Kim, Seung Jun
AU - Soltani, Nasim Yahya
AU - Giannakis, Georgios B.
PY - 2011
Y1 - 2011
N2 - A weighted sum-rate maximization problem is considered for an access point (AP) allocating resources to wireless cognitive radios (CRs) communicating using orthogonal frequency-division multiple access (OFDMA). To protect the incumbent primary user (PU) system operating over the same frequency band, the interference inflicted to the PU receiver must be regulated. Since the channel gain estimates from the AP to the PU receiver may well be inaccurate in practice, a probabilistic interference power constraint is adopted. Although the latter translates to a second-order cone constraint, the overall optimization problem for joint transmit-power and subcarrier allocation is non-convex, and coupled over all subcarriers in general. To circumvent this hurdle, a tight polyhedral approximation of the second-order cone is employed. A near-optimal solution can then be efficiently obtained using the dual method.
AB - A weighted sum-rate maximization problem is considered for an access point (AP) allocating resources to wireless cognitive radios (CRs) communicating using orthogonal frequency-division multiple access (OFDMA). To protect the incumbent primary user (PU) system operating over the same frequency band, the interference inflicted to the PU receiver must be regulated. Since the channel gain estimates from the AP to the PU receiver may well be inaccurate in practice, a probabilistic interference power constraint is adopted. Although the latter translates to a second-order cone constraint, the overall optimization problem for joint transmit-power and subcarrier allocation is non-convex, and coupled over all subcarriers in general. To circumvent this hurdle, a tight polyhedral approximation of the second-order cone is employed. A near-optimal solution can then be efficiently obtained using the dual method.
KW - OFDMA
KW - channel uncertainty
KW - cognitive radios
KW - optimization
KW - resource allocation
UR - http://www.scopus.com/inward/record.url?scp=80051640484&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=80051640484&partnerID=8YFLogxK
U2 - 10.1109/ICASSP.2011.5946699
DO - 10.1109/ICASSP.2011.5946699
M3 - Conference contribution
AN - SCOPUS:80051640484
SN - 9781457705397
T3 - ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings
SP - 3188
EP - 3191
BT - 2011 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2011 - Proceedings
T2 - 36th IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2011
Y2 - 22 May 2011 through 27 May 2011
ER -