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Recently, Hierarchical Spectrum Sharing Network (HSSN) has been proposed to efficiently and flexibly unitize available spectrum resource in cognitive radio context. In the HSSN, available spectrum bands are classified into two types to support both centralized and distributed communications simultaneously. A stable and efficient power control scheme is required to fully make use of the potential of...
In cognitive radio, the design of an effective control channel must be based on a transmission scheme that satisfies two challenging requirements: long transmission range and low emission power. This paper proposes a novel transmission scheme that effectively satisfies these two requirements by combining an orthogonal frequency division multiplexing (OFDM) scheme with transform domain communication...
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