Asymptotically Optimal Resource Allocation in OFDM-Based Cognitive Networks with Multiple Relays

作者：Shaat Mu**ah^*; Bader Faouzi

来源：IEEE Transactions on Wireless Communications, 2012, 11(3): 892-897.

DOI：10.1109/TWC.2012.011012.110880

• Cooperative cognitive radio system
• decode-and-forward
• joint resource allocation
• OFDM
• resource management
• throughput

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.

• 出版日期2012-3