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Asymptotically Optimal Resource Allocation in OFDM-Based Cognitive Networks with Multiple Relays
2012 / IEEE
This item was taken from the IEEE Periodical ' Asymptotically Optimal Resource Allocation in OFDM-Based Cognitive Networks with Multiple Relays ' In this letter, the problem of resources allocation in decode-and-forward (DF) relayed OFDM based cognitive system is considered. The dual decomposition technique is adopted to obtain an asymptotically optimal subcarrier pairing, relay selection, and power allocation. The resources are optimized under the individual power constraints in source and relays so that the sum rate is maximized while the interference induced to the primary system is kept below a pre-specified interference temperature limit. Moreover, a sub-optimal scheme is presented to avoid the high computational complexity of the optimal scheme. The sub-optimal algorithm allocates jointly the different resources taking into account the channel qualities, the DF-relaying strategy, the interference induced to the primary system, and the individual power budgets. The performance of the different schemes and the impact of the constraints values are discussed through the numerical simulation results.
Decode And Forward Communication
Asymptotically Optimal Resource Allocation
Ofdm-based Cognitive Networks
Cooperative Cognitive Radio System
Joint Resource Allocation
Computing And Processing
Communication, Networking And Broadcast Technologies