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WiMAX with femto cells is a cost-effective next-generation broadband wireless communication system. Cognitive Radio (CR) has recently emerged as a promising technology to improve spectrum utilization by allowing dynamic spectrum access. There will be large potential benefits by applying the CR technique to WiMAX with femto cells, which are barely explored in the literature. In this paper, the authors propose a novel cognitive WiMAX architecture with femto cells, where the base station and users are equipped with CRs and intelligently adjust power, channel, and other resources to accommodate the entire network ecosystem.
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