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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Marques, A.G. Xin Wang Giannakis, G.B. |
| Copyright Year | 2007 |
| Description | Author affiliation: Dept. of Electr. Eng., Florida Atlantic Univ., Boca Raton, FL, USA (Xin Wang) || Dept. of Signal Theor. & Commun., Rey Juan Carlos Univ., Madrid, Spain (Marques, A.G.) || Dept. of Electr. & Comput. Eng., Univ. of Minnesota, Minneapolis, MN, USA (Giannakis, G.B.) |
| Abstract | Tailored for the emerging class of cognitive radio networks comprising primary and secondary wireless users, the present paper deals with channel-adaptive allocation of sub-carriers, rate and power resources for orthogonal frequency-division multiple access (OFDMA). Users rely on adaptive modulation and coding that they select in accordance with the limited-rate feedback they receive from the access point. The access point uses channel state information to maximize the weighted average sum-rate of the network while respecting rate and power constraints on the primary and secondary users. When the channel distribution is available, the optimal off-line allocation is obtained to benchmark performance. In addition, a simple yet optimal on-line algorithm is derived using a stochastic primal-dual approach to solve the constrained utility maximization problem formulated. Analysis and simulations corroborate that the low-complexity online recursive scheme converges to the optimal solution regardless of initialization. |
| Starting Page | 861 |
| Ending Page | 865 |
| File Size | 233552 |
| Page Count | 5 |
| File Format | |
| ISBN | 9788392134046 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2007-09-03 |
| Publisher Place | Poland |
| Access Restriction | Subscribed |
| Rights Holder | EUSIPCO |
| Subject Keyword | Fading Bit error rate Europe Resource management Cognitive radio |
| Content Type | Text |
| Resource Type | Article |
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